mongod
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Synopsis
mongod
is the primary daemon process for the MongoDB
system. It handles data requests, manages data access, and performs
background management operations.
This document provides a complete overview of all command line options
for mongod
. These command line options are primarily useful
for testing: In common operation, use the configuration file
options to control the behavior of
your database.
Note
MongoDB disables support for TLS 1.0 encryption on systems where TLS 1.1+ is available. For more details, see Disable TLS 1.0.
Compatibility
Deployments hosted in the following environments use mongod
:
MongoDB Atlas: The fully managed service for MongoDB deployments in the cloud
Note
MongoDB Atlas manages the mongod
for all MongoDB Atlas deployments.
MongoDB Enterprise: The subscription-based, self-managed version of MongoDB
MongoDB Community: The source-available, free-to-use, and self-managed version of MongoDB
Considerations
mongod
includes a Full Time Diagnostic Data Capture mechanism to assist MongoDB engineers with troubleshooting deployments. If this thread fails, it terminates the originating process. To avoid the most common failures, confirm that the user running the process has permissions to create the FTDCdiagnostic.data
directory. Formongod
the directory is withinstorage.dbPath
. Formongos
it is parallel tosystemLog.path
.
Options
Changed in version 4.2:
MongoDB deprecates the SSL options and insteads adds new corresponding TLS options.
MongoDB adds
--tlsClusterCAFile
/net.tls.clusterCAFile
.
Changed in version 4.4:
MongoDB removes the
--noIndexBuildRetry
command-line option and the correspondingstorage.indexBuildRetry
option.
Core Options
--config <filename>, -f <filename>
Specifies a configuration file for runtime configuration options. The configuration file is the preferred method for runtime configuration of
mongod
. The options are equivalent to the command-line configuration options. See Configuration File Options for more information.Ensure the configuration file uses ASCII encoding. The
mongod
instance does not support configuration files with non-ASCII encoding, including UTF-8.
--configExpand <none|rest|exec>
Default: none
New in version 4.2.
Enables using Expansion Directives in configuration files. Expansion directives allow you to set externally sourced values for configuration file options.
--configExpand
supports the following expansion directives:ValueDescriptionnone
Default.mongod
does not expand expansion directives.mongod
fails to start if any configuration file settings use expansion directives.rest
mongod
expands__rest
expansion directives when parsing the configuration file.exec
mongod
expands__exec
expansion directives when parsing the configuration file.You can specify multiple expansion directives as a comma-separated list, for example:
rest, exec
. If the configuration file contains expansion directives not specified to--configExpand
, themongod
returns an error and terminates.See Externally Sourced Configuration File Values for configuration files for more information on expansion directives.
--verbose, -v
Increases the amount of internal reporting returned on standard output or in log files. Increase the verbosity with the
-v
form by including the option multiple times, for example:-vvvvv
.Note
Starting in version 4.2, MongoDB includes the Debug verbosity level (1-5) in the log messages. For example, if the verbosity level is 2, MongoDB logs
D2
. In previous versions, MongoDB log messages only specifiedD
for Debug level.
--quiet
Runs
mongod
in a quiet mode that attempts to limit the amount of output.This option suppresses:
output from database commands
replication activity
connection accepted events
connection closed events
--port <port>
Default:
27017 if
mongod
is not a shard member or a config server member27018 if
mongod
is ashard member
27019 if
mongod
is aconfig server member
The TCP port on which the MongoDB instance listens for client connections.
Changed in version 4.4.26: The
--port
option accepts a range of values between0
and65535
. Setting the port to0
configuresmongod
to use an arbitrary port assigned by the operating system.
--bind_ip <hostnames|ipaddresses|Unix domain socket paths>
Default: localhost
The hostnames and/or IP addresses and/or full Unix domain socket paths on which
mongod
should listen for client connections. You may attachmongod
to any interface. To bind to multiple addresses, enter a list of comma-separated values.Example
localhost,/tmp/mongod.sock
You can specify both IPv4 and IPv6 addresses, or hostnames that resolve to an IPv4 or IPv6 address.
Example
localhost, 2001:0DB8:e132:ba26:0d5c:2774:e7f9:d513
Note
If specifying a link-local IPv6 address (
fe80::/10
), you must append the zone index to that address (i.e.fe80::<address>%<adapter-name>
).Example
localhost,fe80::a00:27ff:fee0:1fcf%enp0s3
Tip
When possible, use a logical DNS hostname instead of an ip address, particularly when configuring replica set members or sharded cluster members. The use of logical DNS hostnames avoids configuration changes due to ip address changes.
Warning
Before binding to a non-localhost (e.g. publicly accessible) IP address, ensure you have secured your cluster from unauthorized access. For a complete list of security recommendations, see Security Checklist. At minimum, consider enabling authentication and hardening network infrastructure.
For more information about IP Binding, refer to the IP Binding documentation.
To bind to all IPv4 addresses, enter
0.0.0.0
.To bind to all IPv4 and IPv6 addresses, enter
::,0.0.0.0
or starting in MongoDB 4.2, an asterisk"*"
(enclose the asterisk in quotes to avoid filename pattern expansion). Alternatively, use thenet.bindIpAll
setting.Note
--bind_ip
and--bind_ip_all
are mutually exclusive. Specifying both options causesmongod
to throw an error and terminate.The command-line option
--bind
overrides the configuration file settingnet.bindIp
.
--bind_ip_all
If specified, the
mongod
instance binds to all IPv4 addresses (i.e.0.0.0.0
). Ifmongod
starts with--ipv6
,--bind_ip_all
also binds to all IPv6 addresses (i.e.::
).mongod
only supports IPv6 if started with--ipv6
. Specifying--bind_ip_all
alone does not enable IPv6 support.Warning
Before binding to a non-localhost (e.g. publicly accessible) IP address, ensure you have secured your cluster from unauthorized access. For a complete list of security recommendations, see Security Checklist. At minimum, consider enabling authentication and hardening network infrastructure.
For more information about IP Binding, refer to the IP Binding documentation.
Alternatively, you can set the
--bind_ip
option to::,0.0.0.0
or, starting in MongoDB 4.2, to an asterisk"*"
(enclose the asterisk in quotes to avoid filename pattern expansion).Note
--bind_ip
and--bind_ip_all
are mutually exclusive. That is, you can specify one or the other, but not both.
--clusterIpSourceWhitelist <string>
New in version 3.6.
A list of IP addresses/CIDR (Classless Inter-Domain Routing) ranges against which the
mongod
validates authentication requests from other members of the replica set and, if part of a sharded cluster, themongos
instances. Themongod
verifies that the originating IP is either explicitly in the list or belongs to a CIDR range in the list. If the IP address is not present, the server does not authenticate themongod
ormongos
.--clusterIpSourceWhitelist
has no effect on amongod
started without authentication.--clusterIpSourceWhitelist
accepts multiple comma-separated IPv4/6 addresses or Classless Inter-Domain Routing (CIDR) ranges:mongod --clusterIpSourceWhitelist 192.0.2.0/24,127.0.0.1,::1 Important
Ensure
--clusterIpSourceWhitelist
includes the IP address or CIDR ranges that include the IP address of each replica set member ormongos
in the deployment to ensure healthy communication between cluster components.
--ipv6
Enables IPv6 support.
mongod
disables IPv6 support by default.Setting
--ipv6
does not direct themongod
to listen on any local IPv6 addresses or interfaces. To configure themongod
to listen on an IPv6 interface, you must either:Configure
--bind_ip
with one or more IPv6 addresses or hostnames that resolve to IPv6 addresses, orSet
--bind_ip_all
totrue
.
--listenBacklog <number>
Default: Target system
SOMAXCONN
constantNew in version 3.6.
The maximum number of connections that can exist in the listen queue.
Warning
Consult your local system's documentation to understand the limitations and configuration requirements before using this parameter.
Important
To prevent undefined behavior, specify a value for this parameter between
1
and the local systemSOMAXCONN
constant.The default value for the
listenBacklog
parameter is set at compile time to the target systemSOMAXCONN
constant.SOMAXCONN
is the maximum valid value that is documented for the backlog parameter to the listen system call.Some systems may interpret
SOMAXCONN
symbolically, and others numerically. The actual listen backlog applied in practice may differ from any numeric interpretation of theSOMAXCONN
constant or argument to--listenBacklog
, and may also be constrained by system settings likenet.core.somaxconn
on Linux.Passing a value for the
listenBacklog
parameter that exceeds theSOMAXCONN
constant for the local system is, by the letter of the standards, undefined behavior. Higher values may be silently integer truncated, may be ignored, may cause unexpected resource consumption, or have other adverse consequences.On systems with workloads that exhibit connection spikes, for which it is empirically known that the local system can honor higher values for the backlog parameter than the
SOMAXCONN
constant, setting thelistenBacklog
parameter to a higher value may reduce operation latency as observed by the client by reducing the number of connections which are forced into a backoff state.
--maxConns <number>
The maximum number of simultaneous connections that
mongod
accepts. This setting has no effect if it is higher than your operating system's configured maximum connection tracking threshold.Do not assign too low of a value to this option, or you will encounter errors during normal application operation.
--logpath <path>
Sends all diagnostic logging information to a log file instead of to standard output or to the host's syslog system. MongoDB creates the log file at the path you specify.
By default, MongoDB moves any existing log file rather than overwriting it. To instead append to the log file, set the
--logappend
option.
--syslog
Sends all logging output to the host's syslog system rather than to standard output or to a log file (
--logpath
).The
--syslog
option is not supported on Windows.Warning
The
syslog
daemon generates timestamps when it logs a message, not when MongoDB issues the message. This can lead to misleading timestamps for log entries, especially when the system is under heavy load. We recommend using the--logpath
option for production systems to ensure accurate timestamps.Starting in version 4.2, MongoDB includes the component in its log messages to
syslog
.... ACCESS [repl writer worker 5] Unsupported modification to roles collection ...
--syslogFacility <string>
Default: user
Specifies the facility level used when logging messages to syslog. The value you specify must be supported by your operating system's implementation of syslog. To use this option, you must enable the
--syslog
option.
--logappend
Appends new entries to the end of the existing log file when the
mongod
instance restarts. Without this option,mongod
backs up the existing log and create a new file.
--logRotate <string>
Default: rename
Determines the behavior for the
logRotate
command. Specify eitherrename
orreopen
:rename
renames the log file.reopen
closes and reopens the log file following the typical Linux/Unix log rotate behavior. Usereopen
when using the Linux/Unix logrotate utility to avoid log loss.If you specify
reopen
, you must also use--logappend
.
If auditing is enabled, the
logRotate
command also rotates the audit log according to the above parameters. For example, if--logRotate
is set torename
, the audit log will also be renamed.
--timeStampFormat <string>
Default: iso8601-local
The time format for timestamps in log messages. Specify one of the following values:
ValueDescriptioniso8601-utc
Displays timestamps in Coordinated Universal Time (UTC) in the ISO-8601 format. For example, for New York at the start of the Epoch:1970-01-01T00:00:00.000Z
iso8601-local
Displays timestamps in local time in the ISO-8601 format. For example, for New York at the start of the Epoch:1969-12-31T19:00:00.000-05:00
Note
Starting in MongoDB 4.4,
--timeStampFormat
no longer supportsctime
. An example ofctime
formatted date is:Wed Dec 31 18:17:54.811
.
--pidfilepath <path>
Specifies a file location to store the process ID (PID) of the
mongod
process. The user running themongod
ormongos
process must be able to write to this path. If the--pidfilepath
option is not specified, the process does not create a PID file. This option is generally only useful in combination with the--fork
option.Note
Linux
On Linux, PID file management is generally the responsibility of your distro's init system: usually a service file in the
/etc/init.d
directory, or a systemd unit file registered withsystemctl
. Only use the--pidfilepath
option if you are not using one of these init systems. For more information, please see the respective Installation Guide for your operating system.Note
macOS
On macOS, PID file management is generally handled by
brew
. Only use the--pidfilepath
option if you are not usingbrew
on your macOS system. For more information, please see the respective Installation Guide for your operating system.
--keyFile <file>
Specifies the path to a key file that stores the shared secret that MongoDB instances use to authenticate to each other in a sharded cluster or replica set.
--keyFile
implies--auth
. See Internal/Membership Authentication for more information.Starting in MongoDB 4.2, keyfiles for internal membership authentication use YAML format to allow for multiple keys in a keyfile. The YAML format accepts either:
A single key string (same as in earlier versions)
A sequence of key strings
The YAML format is compatible with the existing single-key keyfiles that use the text file format.
--setParameter <options>
Specifies one of the MongoDB parameters described in MongoDB Server Parameters. You can specify multiple
setParameter
fields.
--nounixsocket
Disables listening on the UNIX domain socket.
--nounixsocket
applies only to Unix-based systems.The
mongod
process always listens on the UNIX socket unless one of the following is true:--nounixsocket
is setnet.bindIp
is not setnet.bindIp
does not specifylocalhost
or its associated IP address
mongod
installed from official .deb and .rpm packages have thebind_ip
configuration set to127.0.0.1
by default.
--unixSocketPrefix <path>
Default: /tmp
The path for the UNIX socket.
--unixSocketPrefix
applies only to Unix-based systems.If this option has no value, the
mongod
process creates a socket with/tmp
as a prefix. MongoDB creates and listens on a UNIX socket unless one of the following is true:net.unixDomainSocket.enabled
isfalse
--nounixsocket
is setnet.bindIp
is not setnet.bindIp
does not specifylocalhost
or its associated IP address
--filePermissions <path>
Default:
0700
Sets the permission for the UNIX domain socket file.
--filePermissions
applies only to Unix-based systems.
--fork
Enables a daemon mode that runs the
mongod
process in the background. The--fork
option is not supported on Windows.By default
mongod
does not run as a daemon. You runmongod
as a daemon by using either--fork
or a controlling process that handles daemonization, such asupstart
orsystemd
.To use
--fork
, configure log output for themongod
with one of the following:
--auth
Enables authorization to control user's access to database resources and operations. When authorization is enabled, MongoDB requires all clients to authenticate themselves first in order to determine the access for the client.
To configure users, use the mongo shell client. If no users exist, the localhost interface has access to the database until you create the first user.
See Security for more information.
--noauth
Disables authentication. Currently the default. Exists for future compatibility and clarity.
--transitionToAuth
New in version 3.4.
Allows the
mongod
to accept and create authenticated and non-authenticated connections to and from othermongod
andmongos
instances in the deployment. Used for performing rolling transition of replica sets or sharded clusters from a no-auth configuration to internal authentication. Requires specifying a internal authentication mechanism such as--keyFile
.For example, if using keyfiles for internal authentication, the
mongod
creates an authenticated connection with anymongod
ormongos
in the deployment using a matching keyfile. If the security mechanisms do not match, themongod
utilizes a non-authenticated connection instead.A
mongod
running with--transitionToAuth
does not enforce user access controls. Users may connect to your deployment without any access control checks and perform read, write, and administrative operations.Note
A
mongod
running with internal authentication and without--transitionToAuth
requires clients to connect using user access controls. Update clients to connect to themongod
using the appropriate user prior to restartingmongod
without--transitionToAuth
.
--cpu
Forces the
mongod
process to report the percentage of CPU time in write lock, every four seconds.
--cpu
Forces the
mongod
process to report the percentage of CPU time in write lock, every four seconds.
--sysinfo
Returns diagnostic system information and then exits. The information provides the page size, the number of physical pages, and the number of available physical pages.
--notablescan
Forbids operations that require a collection scan. See
notablescan
for additional information.
--shutdown
The
--shutdown
option cleanly and safely terminates themongod
process. When invokingmongod
with this option you must set the--dbpath
option either directly or by way of the configuration file and the--config
option.The
--shutdown
option is available only on Linux systems.For additional ways to shut down, see also Stop
mongod
Processes.
--redactClientLogData
New in version 3.4: Available in MongoDB Enterprise only.
A
mongod
running with--redactClientLogData
redacts any message accompanying a given log event before logging. This prevents themongod
from writing potentially sensitive data stored on the database to the diagnostic log. Metadata such as error or operation codes, line numbers, and source file names are still visible in the logs.Use
--redactClientLogData
in conjunction with Encryption at Rest and TLS/SSL (Transport Encryption) to assist compliance with regulatory requirements.For example, a MongoDB deployment might store Personally Identifiable Information (PII) in one or more collections. The
mongod
logs events such as those related to CRUD operations, sharding metadata, etc. It is possible that themongod
may expose PII as a part of these logging operations. Amongod
running with--redactClientLogData
removes any message accompanying these events before being output to the log, effectively removing the PII.Diagnostics on a
mongod
running with--redactClientLogData
may be more difficult due to the lack of data related to a log event. See the process logging manual page for an example of the effect of--redactClientLogData
on log output.On a running
mongod
, usesetParameter
with theredactClientLogData
parameter to configure this setting.
--networkMessageCompressors <string>
Default: snappy,zstd,zlib
New in version 3.4.
Specifies the default compressor(s) to use for communication between this
mongod
instance and:other members of the deployment if the instance is part of a replica set or a sharded cluster
a
mongo
shelldrivers that support the
OP_COMPRESSED
message format.
MongoDB supports the following compressors:
New in version 4.2: Both
mongod
andmongos
instances default tosnappy,zstd,zlib
compressors, in that order.To disable network compression, set the value to
disabled
.Important
Messages are compressed when both parties enable network compression. Otherwise, messages between the parties are uncompressed.
If you specify multiple compressors, then the order in which you list the compressors matter as well as the communication initiator. For example, if a
mongo
shell specifies the following network compressorszlib,snappy
and themongod
specifiessnappy,zlib
, messages betweenmongo
shell andmongod
useszlib
.If the parties do not share at least one common compressor, messages between the parties are uncompressed. For example, if a
mongo
shell specifies the network compressorzlib
andmongod
specifiessnappy
, messages betweenmongo
shell andmongod
are not compressed.
--timeZoneInfo <path>
The full path from which to load the time zone database. If this option is not provided, then MongoDB will use its built-in time zone database.
The configuration file included with Linux and macOS packages sets the time zone database path to
/usr/share/zoneinfo
by default.The built-in time zone database is a copy of the Olson/IANA time zone database. It is updated along with MongoDB releases, but the time zone database release cycle differs from the MongoDB release cycle. The most recent release of the time zone database is available on our download site.
wget https://downloads.mongodb.org/olson_tz_db/timezonedb-latest.zip unzip timezonedb-latest.zip mongod --timeZoneInfo timezonedb-2017b/ Note
Etc/ Timezones
Etc/*
timezones are supported starting in MongoDB 5.0.4. In earlier versions of MongoDB, use alternative timezone designations. For example, useUTC
instead ofEtc/UTC
.Warning
MongoDB uses the third party timelib library to provide accurate conversions between timezones. Due to a recent update,
timelib
could create inaccurate time zone conversions in older versions of MongoDB.To explicitly link to the time zone database in versions of MongoDB prior to 4.4.7, and 4.2.14, download the time zone database. and use the
timeZoneInfo
parameter.
--serviceExecutor <string>
Default: synchronous
New in version 3.6.
Determines the threading and execution model
mongod
uses to execute client requests. The--serviceExecutor
option accepts one of the following values:ValueDescriptionsynchronous
Themongod
uses synchronous networking and manages its networking thread pool on a per connection basis. Previous versions of MongoDB managed threads in this way.adaptive
Deprecated since version 4.4.
--outputConfig
New in version 4.2.
Outputs the
mongod
instance's configuration options, formatted in YAML, tostdout
and exits themongod
instance. For configuration options that uses Externally Sourced Configuration File Values,--outputConfig
returns the resolved value for those options.Warning
This may include any configured passwords or secrets previously obfuscated through the external source.
For usage examples, see:
LDAP Authentication or Authorization Options
--ldapServers <host1>:<port>,<host2>:<port>,...,<hostN>:<port>
New in version 3.4: Available in MongoDB Enterprise only.
The LDAP server against which the
mongod
authenticates users or determines what actions a user is authorized to perform on a given database. If the LDAP server specified has any replicated instances, you may specify the host and port of each replicated server in a comma-delimited list.If your LDAP infrastructure partitions the LDAP directory over multiple LDAP servers, specify one LDAP server or any of its replicated instances to
--ldapServers
. MongoDB supports following LDAP referrals as defined in RFC 4511 4.1.10. Do not use--ldapServers
for listing every LDAP server in your infrastructure.This setting can be configured on a running
mongod
usingsetParameter
.If unset,
mongod
cannot use LDAP authentication or authorization.
--ldapValidateLDAPServerConfig <boolean>
Available in MongoDB Enterprise
A flag that determines if the
mongod
instance checks the availability of theLDAP server(s)
as part of its startup:If
true
, themongod
instance performs the availability check and only continues to start up if the LDAP server is available.If
false
, themongod
instance skips the availability check; i.e. the instance starts up even if the LDAP server is unavailable.
--ldapQueryUser <string>
Available in MongoDB Enterprise only.
The identity with which
mongod
binds as, when connecting to or performing queries on an LDAP server.Only required if any of the following are true:
Using LDAP authorization.
Using an LDAP query for
username transformation
.The LDAP server disallows anonymous binds
You must use
--ldapQueryUser
with--ldapQueryPassword
.If unset,
mongod
doesn't attempt to bind to the LDAP server.This setting can be configured on a running
mongod
usingsetParameter
.Note
Windows MongoDB deployments can use
--ldapBindWithOSDefaults
instead of--ldapQueryUser
and--ldapQueryPassword
. You cannot specify both--ldapQueryUser
and--ldapBindWithOSDefaults
at the same time.
Available in MongoDB Enterprise only.
The password used to bind to an LDAP server when using
--ldapQueryUser
. You must use --ldapQueryPassword
with
--ldapQueryUser
.
If not set, mongod
does not attempt to bind to the LDAP server.
You can configure this setting on a running mongod
using
setParameter
.
Starting in MongoDB 4.4, the ldapQueryPassword
setParameter
command accepts either a string or
an array of strings. If ldapQueryPassword
is set to an array, MongoDB tries
each password in order until one succeeds. Use a password array to roll over the
LDAP account password without downtime.
Note
Windows MongoDB deployments can use --ldapBindWithOSDefaults
instead of --ldapQueryUser
and --ldapQueryPassword
.
You cannot specify both --ldapQueryPassword
and
--ldapBindWithOSDefaults
at the same time.
--ldapBindWithOSDefaults <bool>
Default: false
New in version 3.4: Available in MongoDB Enterprise for the Windows platform only.
Allows
mongod
to authenticate, or bind, using your Windows login credentials when connecting to the LDAP server.Only required if:
Using LDAP authorization.
Using an LDAP query for
username transformation
.The LDAP server disallows anonymous binds
Use
--ldapBindWithOSDefaults
to replace--ldapQueryUser
and--ldapQueryPassword
.
--ldapBindMethod <string>
Default: simple
New in version 3.4: Available in MongoDB Enterprise only.
The method
mongod
uses to authenticate to an LDAP server. Use with--ldapQueryUser
and--ldapQueryPassword
to connect to the LDAP server.--ldapBindMethod
supports the following values:simple
-mongod
uses simple authentication.sasl
-mongod
uses SASL protocol for authentication
If you specify
sasl
, you can configure the available SASL mechanisms using--ldapBindSaslMechanisms
.mongod
defaults to usingDIGEST-MD5
mechanism.
--ldapBindSaslMechanisms <string>
Default: DIGEST-MD5
New in version 3.4: Available in MongoDB Enterprise only.
A comma-separated list of SASL mechanisms
mongod
can use when authenticating to the LDAP server. Themongod
and the LDAP server must agree on at least one mechanism. Themongod
dynamically loads any SASL mechanism libraries installed on the host machine at runtime.Install and configure the appropriate libraries for the selected SASL mechanism(s) on both the
mongod
host and the remote LDAP server host. Your operating system may include certain SASL libraries by default. Defer to the documentation associated with each SASL mechanism for guidance on installation and configuration.If using the
GSSAPI
SASL mechanism for use with Kerberos Authentication, verify the following for themongod
host machine:Linux
The
KRB5_CLIENT_KTNAME
environment variable resolves to the name of the client Linux Keytab Files for the host machine. For more on Kerberos environment variables, please defer to the Kerberos documentation.The client keytab includes a User Principal for the
mongod
to use when connecting to the LDAP server and execute LDAP queries.
Windows
- If connecting to an Active Directory server, the Windows
Kerberos configuration automatically generates a
Ticket-Granting-Ticket
when the user logs onto the system. Set
--ldapBindWithOSDefaults
totrue
to allowmongod
to use the generated credentials when connecting to the Active Directory server and execute queries.
Set
--ldapBindMethod
tosasl
to use this option.Note
For a complete list of SASL mechanisms see the IANA listing. Defer to the documentation for your LDAP or Active Directory service for identifying the SASL mechanisms compatible with the service.
MongoDB is not a source of SASL mechanism libraries, nor is the MongoDB documentation a definitive source for installing or configuring any given SASL mechanism. For documentation and support, defer to the SASL mechanism library vendor or owner.
For more information on SASL, defer to the following resources:
For Linux, please see the Cyrus SASL documentation.
For Windows, please see the Windows SASL documentation.
--ldapTransportSecurity <string>
Default: tls
New in version 3.4: Available in MongoDB Enterprise only.
By default,
mongod
creates a TLS/SSL secured connection to the LDAP server.For Linux deployments, you must configure the appropriate TLS Options in
/etc/openldap/ldap.conf
file. Your operating system's package manager creates this file as part of the MongoDB Enterprise installation, via thelibldap
dependency. See the documentation forTLS Options
in the ldap.conf OpenLDAP documentation for more complete instructions.For Windows deployment, you must add the LDAP server CA certificates to the Windows certificate management tool. The exact name and functionality of the tool may vary depending on operating system version. Please see the documentation for your version of Windows for more information on certificate management.
Set
--ldapTransportSecurity
tonone
to disable TLS/SSL betweenmongod
and the LDAP server.Warning
Setting
--ldapTransportSecurity
tonone
transmits plaintext information and possibly credentials betweenmongod
and the LDAP server.
--ldapTimeoutMS <long>
Default: 10000
New in version 3.4: Available in MongoDB Enterprise only.
The amount of time in milliseconds
mongod
should wait for an LDAP server to respond to a request.Increasing the value of
--ldapTimeoutMS
may prevent connection failure between the MongoDB server and the LDAP server, if the source of the failure is a connection timeout. Decreasing the value of--ldapTimeoutMS
reduces the time MongoDB waits for a response from the LDAP server.This setting can be configured on a running
mongod
usingsetParameter
.
--ldapUserToDNMapping <string>
New in version 3.4: Available in MongoDB Enterprise only.
Maps the username provided to
mongod
for authentication to a LDAP Distinguished Name (DN). You may need to use--ldapUserToDNMapping
to transform a username into an LDAP DN in the following scenarios:Performing LDAP authentication with simple LDAP binding, where users authenticate to MongoDB with usernames that are not full LDAP DNs.
Using an
LDAP authorization query template
that requires a DN.Transforming the usernames of clients authenticating to Mongo DB using different authentication mechanisms, such as x.509 or kerberos, to a full LDAP DN for authorization.
--ldapUserToDNMapping
expects a quote-enclosed JSON-string representing an ordered array of documents. Each document contains a regular expressionmatch
and either asubstitution
orldapQuery
template used for transforming the incoming username.Each document in the array has the following form:
{ match: "<regex>" substitution: "<LDAP DN>" | ldapQuery: "<LDAP Query>" } FieldDescriptionExamplematch
An ECMAScript-formatted regular expression (regex) to match against a provided username. Each parenthesis-enclosed section represents a regex capture group used bysubstitution
orldapQuery
."(.+)ENGINEERING"
"(.+)DBA"
substitution
An LDAP distinguished name (DN) formatting template that converts the authentication name matched by the
match
regex into a LDAP DN. Each curly bracket-enclosed numeric value is replaced by the corresponding regex capture group extracted from the authentication username via thematch
regex.The result of the substitution must be an RFC4514 escaped string.
"cn={0},ou=engineering, dc=example,dc=com"
ldapQuery
A LDAP query formatting template that inserts the authentication name matched by thematch
regex into an LDAP query URI encoded respecting RFC4515 and RFC4516. Each curly bracket-enclosed numeric value is replaced by the corresponding regex capture group extracted from the authentication username via thematch
expression.mongod
executes the query against the LDAP server to retrieve the LDAP DN for the authenticated user.mongod
requires exactly one returned result for the transformation to be successful, ormongod
skips this transformation."ou=engineering,dc=example, dc=com??one?(user={0})"
Note
For each document in the array, you must use either
substitution
orldapQuery
. You cannot specify both in the same document.When performing authentication or authorization,
mongod
steps through each document in the array in the given order, checking the authentication username against thematch
filter. If a match is found,mongod
applies the transformation and uses the output for authenticating the user.mongod
does not check the remaining documents in the array.If the given document does not match the provided authentication name,
mongod
continues through the list of documents to find additional matches. If no matches are found in any document, or the transformation the document describes fails,mongod
returns an error.Starting in MongoDB 4.4,
mongod
also returns an error if one of the transformations cannot be evaluated due to networking or authentication failures to the LDAP server.mongod
rejects the connection request and does not check the remaining documents in the array.Example
The following shows two transformation documents. The first document matches against any string ending in
@ENGINEERING
, placing anything preceeding the suffix into a regex capture group. The second document matches against any string ending in@DBA
, placing anything preceeding the suffix into a regex capture group.Important
You must pass the array to --ldapUserToDNMapping as a string.
"[ { match: "(.+)@ENGINEERING.EXAMPLE.COM", substitution: "cn={0},ou=engineering,dc=example,dc=com" }, { match: "(.+)@DBA.EXAMPLE.COM", ldapQuery: "ou=dba,dc=example,dc=com??one?(user={0})" } ]" A user with username
alice@ENGINEERING.EXAMPLE.COM
matches the first document. The regex capture group{0}
corresponds to the stringalice
. The resulting output is the DN"cn=alice,ou=engineering,dc=example,dc=com"
.A user with username
bob@DBA.EXAMPLE.COM
matches the second document. The regex capture group{0}
corresponds to the stringbob
. The resulting output is the LDAP query"ou=dba,dc=example,dc=com??one?(user=bob)"
.mongod
executes this query against the LDAP server, returning the result"cn=bob,ou=dba,dc=example,dc=com"
.If
--ldapUserToDNMapping
is unset,mongod
applies no transformations to the username when attempting to authenticate or authorize a user against the LDAP server.This setting can be configured on a running
mongod
using thesetParameter
database command.
--ldapAuthzQueryTemplate <string>
New in version 3.4: Available in MongoDB Enterprise only.
A relative LDAP query URL formatted conforming to RFC4515 and RFC4516 that
mongod
executes to obtain the LDAP groups to which the authenticated user belongs to. The query is relative to the host or hosts specified in--ldapServers
.In the URL, you can use the following substituion tokens:
Substitution TokenDescription{USER}
Substitutes the authenticated username, or thetransformed
username if ausername mapping
is specified.{PROVIDED_USER}
Substitutes the supplied username, i.e. before either authentication or
LDAP transformation
.New in version 4.2.
When constructing the query URL, ensure that the order of LDAP parameters respects RFC4516:
[ dn [ ? [attributes] [ ? [scope] [ ? [filter] [ ? [Extensions] ] ] ] ] ] If your query includes an attribute,
mongod
assumes that the query retrieves a the DNs which this entity is member of.If your query does not include an attribute,
mongod
assumes the query retrieves all entities which the user is member of.For each LDAP DN returned by the query,
mongod
assigns the authorized user a corresponding role on theadmin
database. If a role on the on theadmin
database exactly matches the DN,mongod
grants the user the roles and privileges assigned to that role. See thedb.createRole()
method for more information on creating roles.Example
This LDAP query returns any groups listed in the LDAP user object's
memberOf
attribute."{USER}?memberOf?base" Your LDAP configuration may not include the
memberOf
attribute as part of the user schema, may possess a different attribute for reporting group membership, or may not track group membership through attributes. Configure your query with respect to your own unique LDAP configuration.If unset,
mongod
cannot authorize users using LDAP.This setting can be configured on a running
mongod
using thesetParameter
database command.
Storage Options
--storageEngine string
Default:
wiredTiger
Note
Starting in version 4.2, MongoDB removes the deprecated MMAPv1 storage engine.
Specifies the storage engine for the
mongod
database. Available values include:ValueDescriptionwiredTiger
To specify the WiredTiger Storage Engine.inMemory
To specify the In-Memory Storage Engine.
New in version 3.2: Available in MongoDB Enterprise only.
If you attempt to start a
mongod
with a--dbpath
that contains data files produced by a storage engine other than the one specified by--storageEngine
,mongod
doesn't start.
--dbpath <path>
Default:
/data/db
on Linux and macOS,\data\db
on WindowsThe directory where the
mongod
instance stores its data.If using the default configuration file included with a package manager installation of MongoDB, the corresponding
storage.dbPath
setting uses a different default.The files in
--dbpath
must correspond to the storage engine specified in--storageEngine
. If the data files do not correspond to--storageEngine
,mongod
doesn't start.
--directoryperdb
Uses a separate directory to store data for each database. The directories are under the
--dbpath
directory, and each subdirectory name corresponds to the database name.Not available for
mongod
instances that use the in-memory storage engine.To change the
--directoryperdb
option for existing deployments:For standalone instances:
Use
mongodump
on the existingmongod
instance to generate a backup.Stop the
mongod
instance.Add the
--directoryperdb
value and configure a new data directoryRestart the
mongod
instance.Use
mongorestore
to populate the new data directory.
For replica sets:
Stop a secondary member.
Add the
--directoryperdb
value and configure a new data directory to that secondary member.Restart that secondary.
Use initial sync to populate the new data directory.
Update remaining secondaries in the same fashion.
Step down the primary, and update the stepped-down member in the same fashion.
--syncdelay <value>
Default: 60
Controls how much time can pass before MongoDB flushes data to the data files.
Do not set this value on production systems. In almost every situation, you should use the default setting.
The
mongod
process writes data very quickly to the journal and lazily to the data files.--syncdelay
has no effect on journaling, but if--syncdelay
is set to0
the journal eventually consumes all available disk space.Not available for
mongod
instances that use the in-memory storage engine.To provide durable data, WiredTiger uses checkpoints. For more details, see Journaling and the WiredTiger Storage Engine.
--upgrade
Upgrades the on-disk data format of the files specified by the
--dbpath
to the latest version, if needed.This option only affects the operation of the
mongod
if the data files are in an old format.In most cases you should not set this value, so you can exercise the most control over your upgrade process. See the MongoDB release notes for more information about the upgrade process.
--repair
Runs a repair routine on all databases for a
mongod
instance. The operation attempts to:Salvage corrupt data. The operation discards any corrupt data that cannot be salvaged.
Rebuild indexes. The operation validates collections and rebuilds all indexes for collections with inconsistencies between the collection data and one or more indexes. The operation also rebuilds indexes for all salvaged and modified collections. (Changed in version 4.4.)
Tip
If you are running with journaling enabled, there is almost never any need to run repair since the server can use the journal files to restore the data files to a clean state automatically. However, you may need to run repair in cases where you need to recover from a disk-level data corruption.
Warning
Only use
mongod --repair
if you have no other options. The operation removes and does not save any corrupt data during the repair process.Avoid running
--repair
against a replica set member:To repair a replica set member, if you have an intact copy of your data available (e.g. a recent backup or an intact member of the replica set), restore from that intact copy instead(see Resync a Member of a Replica Set).
If you do choose to run
mongod --repair
against a replica set member and the operation modifies the data or the metadata, you must still perform a full resync in order for the member to rejoin the replica set.
Before using
--repair
, make a backup copy of thedbpath
directory.If repair fails to complete for any reason, you must restart the instance using the
--repair
option.
--journal
Enables the durability journal to ensure data files remain valid and recoverable. This option applies only when you specify the
--dbpath
option.mongod
enables journaling by default.Not available for
mongod
instances that use the in-memory storage engine.If any voting member of a replica set uses the in-memory storage engine, you must set
writeConcernMajorityJournalDefault
tofalse
.Starting in version 4.2 (and 4.0.13 and 3.6.14 ), if a replica set member uses the in-memory storage engine (voting or non-voting) but the replica set has
writeConcernMajorityJournalDefault
set to true, the replica set member logs a startup warning.
--nojournal
Disables journaling.
mongod
enables journaling by default.Not available for
mongod
instances that use the in-memory storage engine.Starting in MongoDB 4.0, you cannot specify
--nojournal
option orstorage.journal.enabled: false
for replica set members that use the WiredTiger storage engine.
--journalCommitInterval <value>
Default: 100
The maximum amount of time in milliseconds that the
mongod
process allows between journal operations. Values can range from 1 to 500 milliseconds. Lower values increase the durability of the journal, at the expense of disk performance.On WiredTiger, the default journal commit interval is 100 milliseconds. A write that includes or implies
j:true
causes an immediate sync of the journal. For details and additional conditions that affect the frequency of the sync, see Journaling Process.Not available for
mongod
instances that use the in-memory storage engine.Note
Known Issue in 4.2.0: The
--journalCommitInterval
is missing in 4.2.0.
WiredTiger Options
--wiredTigerCacheSizeGB <float>
Defines the maximum size of the internal cache that WiredTiger uses for all data. The memory consumed by an index build (see
maxIndexBuildMemoryUsageMegabytes
) is separate from the WiredTiger cache memory.Values can range from
0.25
GB to10000
GB.Starting in MongoDB 3.4, the default WiredTiger internal cache size is the larger of either:
50% of (RAM - 1 GB), or
256 MB.
For example, on a system with a total of 4GB of RAM the WiredTiger cache will use 1.5GB of RAM (
0.5 * (4 GB - 1 GB) = 1.5 GB
). Conversely, a system with a total of 1.25 GB of RAM will allocate 256 MB to the WiredTiger cache because that is more than half of the total RAM minus one gigabyte (0.5 * (1.25 GB - 1 GB) = 128 MB < 256 MB
).Note
In some instances, such as when running in a container, the database can have memory constraints that are lower than the total system memory. In such instances, this memory limit, rather than the total system memory, is used as the maximum RAM available.
To see the memory limit, see
hostInfo.system.memLimitMB
.Avoid increasing the WiredTiger internal cache size above its default value.
With WiredTiger, MongoDB utilizes both the WiredTiger internal cache and the filesystem cache.
Via the filesystem cache, MongoDB automatically uses all free memory that is not used by the WiredTiger cache or by other processes.
Note
The
--wiredTigerCacheSizeGB
limits the size of the WiredTiger internal cache. The operating system will use the available free memory for filesystem cache, which allows the compressed MongoDB data files to stay in memory. In addition, the operating system will use any free RAM to buffer file system blocks and file system cache.To accommodate the additional consumers of RAM, you may have to decrease WiredTiger internal cache size.
The default WiredTiger internal cache size value assumes that there is a single
mongod
instance per machine. If a single machine contains multiple MongoDB instances, then you should decrease the setting to accommodate the othermongod
instances.If you run
mongod
in a container (e.g.lxc
,cgroups
, Docker, etc.) that does not have access to all of the RAM available in a system, you must set--wiredTigerCacheSizeGB
to a value less than the amount of RAM available in the container. The exact amount depends on the other processes running in the container. SeememLimitMB
.
--wiredTigerMaxCacheOverflowFileSizeGB <float>
Note
Deprecated in MongoDB 4.4
MongoDB deprecates the
--wiredTigerMaxCacheOverflowFileSizeGB
option. The option has no effect starting in MongoDB 4.4.Specifies the maximum size (in GB) for the "lookaside (or cache overflow) table" file
WiredTigerLAS.wt
for MongoDB 4.2.1-4.2.x. The file no longer exists starting in version 4.4.The setting can accept the following values:
ValueDescription0
The default value. If set to0
, the file size is unbounded.number >= 0.1The maximum size (in GB). If theWiredTigerLAS.wt
file exceeds this size,mongod
exits with a fatal assertion. You can clear theWiredTigerLAS.wt
file and restartmongod
.To change the maximum size during runtime, use the
wiredTigerMaxCacheOverflowSizeGB
parameter.New in version 4.2.1.
--wiredTigerJournalCompressor <compressor>
Default: snappy
Specifies the type of compression to use to compress WiredTiger journal data.
Available compressors are:
--wiredTigerDirectoryForIndexes
When you start
mongod
with--wiredTigerDirectoryForIndexes
,mongod
stores indexes and collections in separate subdirectories under the data (i.e.--dbpath
) directory. Specifically,mongod
stores the indexes in a subdirectory namedindex
and the collection data in a subdirectory namedcollection
.By using a symbolic link, you can specify a different location for the indexes. Specifically, when
mongod
instance is not running, move theindex
subdirectory to the destination and create a symbolic link namedindex
under the data directory to the new destination.
--wiredTigerCollectionBlockCompressor <compressor>
Default: snappy
Specifies the default compression for collection data. You can override this on a per-collection basis when creating collections.
Available compressors are:
--wiredTigerCollectionBlockCompressor
affects all collections created. If you change the value of--wiredTigerCollectionBlockCompressor
on an existing MongoDB deployment, all new collections use the specified compressor. Existing collections continue to use the compressor specified when they were created, or the default compressor at that time.
--wiredTigerIndexPrefixCompression <boolean>
Default: true
Enables or disables prefix compression for index data.
Specify
true
for--wiredTigerIndexPrefixCompression
to enable prefix compression for index data, orfalse
to disable prefix compression for index data.The
--wiredTigerIndexPrefixCompression
setting affects all indexes created. If you change the value of--wiredTigerIndexPrefixCompression
on an existing MongoDB deployment, all new indexes use prefix compression. Existing indexes are not affected.
Replication Options
--replSet <setname>
Configures replication. Specify a replica set name as an argument to this set. All hosts in the replica set must have the same set name.
Starting in MongoDB 4.0,
For the WiredTiger storage engine,
--replSet
cannot be used in conjunction with--nojournal
.
If your application connects to more than one replica set, each set must have a distinct name. Some drivers group replica set connections by replica set name.
--oplogSize <value>
Specifies a maximum size in megabytes for the replication operation log (i.e., the oplog).
Note
The oplog can grow past its configured size limit to avoid deleting the
majority commit point
.By default, the
mongod
process creates an oplog based on the maximum amount of space available. For 64-bit systems, the oplog is typically 5% of available disk space.Once the
mongod
has created the oplog for the first time, changing the--oplogSize
option doesn't affect the size of the oplog. To change the minimum oplog retention period after starting themongod
, usereplSetResizeOplog
.replSetResizeOplog
enables you to resize the oplog dynamically without restarting themongod
process. To persist the changes made usingreplSetResizeOplog
through a restart, update the value of--oplogSize
.See Oplog Size for more information.
--oplogMinRetentionHours <value>
New in version 4.4: Specifies the minimum number of hours to preserve an oplog entry, where the decimal values represent the fractions of an hour. For example, a value of
1.5
represents one hour and thirty minutes.The value must be greater than or equal to
0
. A value of0
indicates that themongod
should truncate the oplog starting with the oldest entries to maintain the configured maximum oplog size.Defaults to
0
.A
mongod
started with--oplogMinRetentionHours
only removes an oplog entry if:The oplog has reached the maximum configured oplog size and
The oplog entry is older than the configured number of hours based on the host system clock.
The
mongod
has the following behavior when configured with a minimum oplog retention period:The oplog can grow without constraint so as to retain oplog entries for the configured number of hours. This may result in reduction or exhaustion of system disk space due to a combination of high write volume and large retention period.
If the oplog grows beyond its maximum size, the
mongod
may continue to hold that disk space even if the oplog returns to its maximum size or is configured for a smaller maximum size. See Reducing Oplog Size Does Not Immediately Return Disk Space.The
mongod
compares the system wall clock to an oplog entries creation wall clock time when enforcing oplog entry retention. Clock drift between cluster components may result in unexpected oplog retention behavior. See Clock Synchronization for more information on clock synchronization across cluster members.
To change the minimum oplog retention period after starting the
mongod
, usereplSetResizeOplog
.replSetResizeOplog
enables you to resize the oplog dynamically without restarting themongod
process. To persist the changes made usingreplSetResizeOplog
through a restart, update the value of--oplogMinRetentionHours
.
--enableMajorityReadConcern
Default: true
Starting in MongoDB 3.6, MongoDB enables support for
"majority"
read concern by default.You can disable read concern
"majority"
to prevent the storage cache pressure from immobilizing a deployment with a three-member primary-secondary-arbiter (PSA) architecture. For more information about disabling read concern"majority"
, see Disable Read Concern Majority.To disable, set
--enableMajorityReadConcern
to false.--enableMajorityReadConcern
has no effect for MongoDB versions: 4.0.0, 4.0.1, 4.0.2, 3.6.0.Important
In general, avoid disabling
"majority"
read concern unless necessary. However, if you have a three-member replica set with a primary-secondary-arbiter (PSA) architecture or a sharded cluster with a three-member PSA shards, disable to prevent the storage cache pressure from immobilizing the deployment.Disabling
"majority"
read concern affects support for transactions on sharded clusters. Specifically:A transaction cannot use read concern
"snapshot"
if the transaction involves a shard that has disabled read concern "majority".A transaction that writes to multiple shards errors if any of the transaction's read or write operations involves a shard that has disabled read concern
"majority"
.
However, it does not affect transactions on replica sets. For transactions on replica sets, you can specify read concern
"majority"
(or"snapshot"
or"local"
) for distributed transactions even if read concern"majority"
is disabled.Disabling
"majority"
read concern preventscollMod
commands which modify an index from rolling back. If such an operation needs to be rolled back, you must resync the affected nodes with the primary node.Disabling
"majority"
read concern has no effect on change streams availability.
Sharded Cluster Options
--configsvr
Required if starting a config server.
Declares that this
mongod
instance serves as the config server of a sharded cluster. When running with this option, clients (i.e. other cluster components) cannot write data to any database other thanconfig
andadmin
. The default port for amongod
with this option is27019
and the default--dbpath
directory is/data/configdb
, unless specified.Important
When starting a MongoDB server with
--configsvr
, you must also specify a--replSet
.The use of the deprecated mirrored
mongod
instances as config servers (SCCC) is no longer supported.The replica set config servers (CSRS) must run the WiredTiger storage engine.
The
--configsvr
option creates a local oplog.Do not use the
--configsvr
option with--shardsvr
. Config servers cannot be a shard server.Do not use the
--configsvr
with theskipShardingConfigurationChecks
parameter. That is, if you are temporarily starting themongod
as a standalone for maintenance operations, include the parameterskipShardingConfigurationChecks
and exclude--configsvr
. Once maintenance has completed, remove theskipShardingConfigurationChecks
parameter and restart with--configsvr
.
--shardsvr
Required if starting a shard server.
Configures this
mongod
instance as a shard in a sharded cluster. The default port for these instances is27018
.Important
Do not use the
--shardsvr
with theskipShardingConfigurationChecks
parameter. That is, if you are temporarily starting themongod
as a standalone for maintenance operations, include the parameterskipShardingConfigurationChecks
and exclude--shardsvr
. Once maintenance has completed, remove theskipShardingConfigurationChecks
parameter and restart with--shardsvr
.
TLS Options
--tlsMode <mode>
New in version 4.2.
Enables TLS used for all network connections. The argument to the
--tlsMode
option can be one of the following:ValueDescriptiondisabled
The server does not use TLS.allowTLS
Connections between servers do not use TLS. For incoming connections, the server accepts both TLS and non-TLS.preferTLS
Connections between servers use TLS. For incoming connections, the server accepts both TLS and non-TLS.requireTLS
The server uses and accepts only TLS encrypted connections.If
--tlsCAFile
ortls.CAFile
is not specified and you are not using x.509 authentication, you must set thetlsUseSystemCA
parameter totrue
. This makes MongoDB use the system-wide CA certificate store when connecting to a TLS-enabled server.If using x.509 authentication,
--tlsCAFile
ortls.CAFile
must be specified unless using--tlsCertificateSelector
.For more information about TLS and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--tlsCertificateKeyFile <filename>
New in version 4.2: Specifies the
.pem
file that contains both the TLS certificate and key.On macOS or Windows, you can use the
--tlsCertificateSelector
option to specify a certificate from the operating system's secure certificate store instead of a PEM key file.--tlsCertificateKeyFile
and--tlsCertificateSelector
options are mutually exclusive. You can only specify one.On Linux/BSD, you must specify
--tlsCertificateKeyFile
when TLS/SSL is enabled.On Windows or macOS, you must specify either
--tlsCertificateKeyFile
or--tlsCertificateSelector
when TLS/SSL is enabled.Important
For Windows only, MongoDB does not support encrypted PEM files. The
mongod
fails to start if it encounters an encrypted PEM file. To securely store and access a certificate for use with TLS on Windows, use--tlsCertificateSelector
.
For more information about TLS and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--tlsCertificateKeyFilePassword <value>
New in version 4.2.
Specifies the password to decrypt the certificate-key file (i.e.
--tlsCertificateKeyFile
). Use the--tlsCertificateKeyFilePassword
option only if the certificate-key file is encrypted. In all cases, themongod
redacts the password from all logging and reporting output.On Linux/BSD, if the private key in the PEM file is encrypted and you do not specify the
--tlsCertificateKeyFilePassword
option, MongoDB prompts for a passphrase. See TLS/SSL Certificate Passphrase.On macOS, if the private key in the PEM file is encrypted, you must explicitly specify the
--tlsCertificateKeyFilePassword
option. Alternatively, you can use a certificate from the secure system store (see--tlsCertificateSelector
) instead of a PEM file or use an unencrypted PEM file.On Windows, MongoDB does not support encrypted certificates. The
mongod
fails if it encounters an encrypted PEM file. Use--tlsCertificateSelector
instead.
For more information about TLS and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--clusterAuthMode <option>
Default: keyFile
The authentication mode used for cluster authentication. If you use internal x.509 authentication, specify so here. This option can have one of the following values:
ValueDescriptionkeyFile
Use a keyfile for authentication. Accept only keyfiles.sendKeyFile
For rolling upgrade purposes. Send a keyfile for authentication but can accept both keyfiles and x.509 certificates.sendX509
For rolling upgrade purposes. Send the x.509 certificate for authentication but can accept both keyfiles and x.509 certificates.x509
Recommended. Send the x.509 certificate for authentication and accept only x.509 certificates.If
--tlsCAFile
ortls.CAFile
is not specified and you are not using x.509 authentication, you must set thetlsUseSystemCA
parameter totrue
. This makes MongoDB use the system-wide CA certificate store when connecting to a TLS-enabled server.If using x.509 authentication,
--tlsCAFile
ortls.CAFile
must be specified unless using--tlsCertificateSelector
.For more information about TLS and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--tlsClusterFile <filename>
New in version 4.2: Specifies the
.pem
file that contains the x.509 certificate-key file for membership authentication for the cluster or replica set.On macOS or Windows, you can use the
--tlsClusterCertificateSelector
option to specify a certificate from the operating system's secure certificate store instead of a PEM key file.--tlsClusterFile
and--tlsClusterCertificateSelector
options are mutually exclusive. You can only specify one.If
--tlsClusterFile
does not specify the.pem
file for internal cluster authentication or the alternative--tlsClusterCertificateSelector
, the cluster uses the.pem
file specified in the--tlsCertificateKeyFile
option or the certificate returned by the--tlsCertificateSelector
.If using x.509 authentication,
--tlsCAFile
ortls.CAFile
must be specified unless using--tlsCertificateSelector
.Changed in version 4.4:
mongod
/mongos
logs a warning on connection if the presented x.509 certificate expires within30
days of themongod/mongos
host system time. See x.509 Certificates Nearing Expiry Trigger Warnings for more information.For more information about TLS and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .Important
For Windows only, MongoDB does not support encrypted PEM files. The
mongod
fails to start if it encounters an encrypted PEM file. To securely store and access a certificate for use with membership authentication on Windows, use--tlsClusterCertificateSelector
.
--tlsCertificateSelector <parameter>=<value>
New in version 4.2: Available on Windows and macOS as an alternative to
--tlsCertificateKeyFile
.Specifies a certificate property in order to select a matching certificate from the operating system's certificate store to use for TLS.
The
--tlsCertificateKeyFile
and--tlsCertificateSelector
options are mutually exclusive. You can only specify one.--tlsCertificateSelector
accepts an argument of the format<property>=<value>
where the property can be one of the following:PropertyValue typeDescriptionsubject
ASCII stringSubject name or common name on certificatethumbprint
hex stringA sequence of bytes, expressed as hexadecimal, used to identify a public key by its SHA-1 digest.
The
thumbprint
is sometimes referred to as afingerprint
.When using the system SSL certificate store, OCSP (Online Certificate Status Protocol) is used to validate the revocation status of certificates.
The
mongod
searches the operating system's secure certificate store for the CA certificates required to validate the full certificate chain of the specified TLS certificate. Specifically, the secure certificate store must contain the root CA and any intermediate CA certificates required to build the full certificate chain to the TLS certificate. Do not use--tlsCAFile
or--tlsClusterCAFile
to specify the root and intermediate CA certificateFor example, if the TLS/SSL certificate was signed with a single root CA certificate, the secure certificate store must contain that root CA certificate. If the TLS/SSL certificate was signed with an intermediate CA certificate, the secure certificate store must contain the intermedia CA certificate and the root CA certificate.
--tlsClusterCertificateSelector <parameter>=<value>
New in version 4.2: Available on Windows and macOS as an alternative to
--tlsClusterFile
.Specifies a certificate property in order to select a matching certificate from the operating system's certificate store to use for internal x.509 membership authentication.
--tlsClusterFile
and--tlsClusterCertificateSelector
options are mutually exclusive. You can only specify one.--tlsClusterCertificateSelector
accepts an argument of the format<property>=<value>
where the property can be one of the following:PropertyValue typeDescriptionsubject
ASCII stringSubject name or common name on certificatethumbprint
hex stringA sequence of bytes, expressed as hexadecimal, used to identify a public key by its SHA-1 digest.
The
thumbprint
is sometimes referred to as afingerprint
.The
mongod
searches the operating system's secure certificate store for the CA certificates required to validate the full certificate chain of the specified cluster certificate. Specifically, the secure certificate store must contain the root CA and any intermediate CA certificates required to build the full certificate chain to the cluster certificate. Do not use--tlsCAFile
or--tlsClusterCAFile
to specify the root and intermediate CA certificate.For example, if the cluster certificate was signed with a single root CA certificate, the secure certificate store must contain that root CA certificate. If the cluster certificate was signed with an intermediate CA certificate, the secure certificate store must contain the intermedia CA certificate and the root CA certificate.
Changed in version 4.4:
mongod
/mongos
logs a warning on connection if the presented x.509 certificate expires within30
days of themongod/mongos
host system time. See x.509 Certificates Nearing Expiry Trigger Warnings for more information.
--tlsClusterPassword <value>
New in version 4.2.
Specifies the password to decrypt the x.509 certificate-key file specified with
--tlsClusterFile
. Use the--tlsClusterPassword
option only if the certificate-key file is encrypted. In all cases, themongod
redacts the password from all logging and reporting output.On Linux/BSD, if the private key in the x.509 file is encrypted and you do not specify the
--tlsClusterPassword
option, MongoDB prompts for a passphrase. See TLS/SSL Certificate Passphrase.On macOS, if the private key in the x.509 file is encrypted, you must explicitly specify the
--tlsClusterPassword
option. Alternatively, you can either use a certificate from the secure system store (see--tlsClusterCertificateSelector
) instead of a cluster PEM file or use an unencrypted PEM file.On Windows, MongoDB does not support encrypted certificates. The
mongod
fails if it encounters an encrypted PEM file. Use--tlsClusterCertificateSelector
instead.
For more information about TLS and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--tlsCAFile <filename>
New in version 4.2.
Specifies the
.pem
file that contains the root certificate chain from the Certificate Authority. Specify the file name of the.pem
file using relative or absolute paths.Important
When starting a
mongod
instance with TLS/SSL enabled, you must specify a value for the--tlsCAFile
flag, thenet.tls.CAFile
configuration option, or thetlsUseSystemCA
parameter.--tlsCAFile
,tls.CAFile
, andtlsUseSystemCA
are all mutually exclusive.- Windows/macOS Only
- If using
--tlsCertificateSelector
and/or--tlsClusterCertificateSelector
, do not use--tlsCAFile
to specify the root and intermediate CA certificates. Store all CA certificates required to validate the full trust chain of the--tlsCertificateSelector
and/or--tlsClusterCertificateSelector
certificates in the secure certificate store.
For more information about TLS and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--tlsClusterCAFile <filename>
New in version 4.2.
Specifies the
.pem
file that contains the root certificate chain from the Certificate Authority used to validate the certificate presented by a client establishing a connection. Specify the file name of the.pem
file using relative or absolute paths.--tlsClusterCAFile
requires that--tlsCAFile
is set.If
--tlsClusterCAFile
does not specify the.pem
file for validating the certificate from a client establishing a connection, the cluster uses the.pem
file specified in the--tlsCAFile
option.--tlsClusterCAFile
lets you use separate Certificate Authorities to verify the client to server and server to client portions of the TLS handshake.- Windows/macOS Only
- If using
--tlsCertificateSelector
and/or--tlsClusterCertificateSelector
, do not use--tlsClusterCAFile
to specify the root and intermediate CA certificates. Store all CA certificates required to validate the full trust chain of the--tlsCertificateSelector
and/or--tlsClusterCertificateSelector
certificates in the secure certificate store.
For more information about TLS and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--tlsCRLFile <filename>
New in version 4.2.
Specifies the
.pem
file that contains the Certificate Revocation List. Specify the file name of the.pem
file using relative or absolute paths.Note
You cannot specify a CRL file on macOS. Instead, you can use the system SSL certificate store, which uses OCSP (Online Certificate Status Protocol) to validate the revocation status of certificates. See
--tlsCertificateSelector
to use the system SSL certificate store.Starting in version 4.4, to check for certificate revocation, MongoDB
enables
the use of OCSP (Online Certificate Status Protocol) by default as an alternative to specifying a CRL file or using the system SSL certificate store.
For more information about TLS and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--tlsAllowInvalidCertificates
New in version 4.2.
Bypasses the validation checks for TLS certificates on other servers in the cluster and allows the use of invalid certificates to connect.
Note
If you specify
--tlsAllowInvalidCertificates
ortls.allowInvalidCertificates: true
when using x.509 authentication, an invalid certificate is only sufficient to establish a TLS connection but is insufficient for authentication.When using the
--tlsAllowInvalidCertificates
setting, MongoDB logs a warning regarding the use of the invalid certificate.For more information about TLS and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--tlsAllowInvalidHostnames
New in version 4.2.
Disables the validation of the hostnames in TLS certificates, when connecting to other members of the replica set or sharded cluster for inter-process authentication. This allows
mongod
to connect to other members if the hostnames in their certificates do not match their configured hostname.For more information about TLS and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--tlsAllowConnectionsWithoutCertificates
New in version 4.2.
By default, the server bypasses client certificate validation unless the server is configured to use a CA file. If a CA file is provided, the following rules apply:
For clients that don't provide certificates,
mongod
ormongos
encrypts the TLS/SSL connection, assuming the connection is successfully made.For clients that present a certificate,
mongod
performs certificate validation using the root certificate chain specified by--tlsCAFile
and reject clients with invalid certificates.
Use the
--tlsAllowConnectionsWithoutCertificates
option if you have a mixed deployment that includes clients that do not or cannot present certificates to themongod
.For more information about TLS and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--tlsDisabledProtocols <protocol(s)>
New in version 4.2.
Prevents a MongoDB server running with TLS from accepting incoming connections that use a specific protocol or protocols. To specify multiple protocols, use a comma separated list of protocols.
--tlsDisabledProtocols
recognizes the following protocols:TLS1_0
,TLS1_1
,TLS1_2
, andTLS1_3
.On macOS, you cannot disable
TLS1_1
and leave bothTLS1_0
andTLS1_2
enabled. You must disable at least one of the other two, for example,TLS1_0,TLS1_1
.To list multiple protocols, specify as a comma separated list of protocols. For example
TLS1_0,TLS1_1
.Specifying an unrecognized protocol prevents the server from starting.
The specified disabled protocols overrides any default disabled protocols.
MongoDB disables the use of TLS 1.0 if TLS 1.1+ is available on the system. To enable the disabled TLS 1.0, specify
none
to--tlsDisabledProtocols
. See Disable TLS 1.0.Members of replica sets and sharded clusters must speak at least one protocol in common.
--tlsFIPSMode
New in version 4.2.
Directs the
mongod
to use the FIPS mode of the TLS library. Your system must have a FIPS compliant library to use the--tlsFIPSMode
option.Note
FIPS-compatible TLS/SSL is available only in MongoDB Enterprise. See Configure MongoDB for FIPS for more information.
SSL Options (Deprecated)
Important
All SSL options are deprecated since 4.2. Use the TLS counterparts instead, as they have identical functionality to the SSL options. The SSL protocol is deprecated and MongoDB supports TLS 1.0 and later.
--sslOnNormalPorts
Deprecated since version 2.6: Use
--tlsMode requireTLS
instead.Enables TLS/SSL for
mongod
.With
--sslOnNormalPorts
, amongod
requires TLS/SSL encryption for all connections on the default MongoDB port, or the port specified by--port
. By default,--sslOnNormalPorts
is disabled.For more information about TLS/SSL and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--sslMode <mode>
Deprecated since version 4.2: Use
--tlsMode
instead.Enables TLS/SSL or mixed TLS/SSL used for all network connections. The argument to the
--sslMode
option can be one of the following:ValueDescriptiondisabled
The server does not use TLS/SSL.allowSSL
Connections between servers do not use TLS/SSL. For incoming connections, the server accepts both TLS/SSL and non-TLS/non-SSL.preferSSL
Connections between servers use TLS/SSL. For incoming connections, the server accepts both TLS/SSL and non-TLS/non-SSL.requireSSL
The server uses and accepts only TLS/SSL encrypted connections.If
--tlsCAFile
/net.tls.CAFile
(or their aliases--sslCAFile
/net.ssl.CAFile
) is not specified and you are not using x.509 authentication, you must set thetlsUseSystemCA
parameter totrue
. This makes MongoDB use the system-wide CA certificate store when connecting to a TLS-enabled server.To use x.509 authentication,
--tlsCAFile
ornet.tls.CAFile
must be specified unless using--tlsCertificateSelector
or--net.tls.certificateSelector
. Or if using thessl
aliases,--sslCAFile
ornet.ssl.CAFile
must be specified unless using--sslCertificateSelector
ornet.ssl.certificateSelector
.For more information about TLS/SSL and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--sslPEMKeyFile <filename>
Deprecated since version 4.2: Use
--tlsCertificateKeyFile
instead.Specifies the
.pem
file that contains both the TLS/SSL certificate and key.On macOS or Windows, you can use the
--sslCertificateSelector
option to specify a certificate from the operating system's secure certificate store instead of a PEM key file.--sslPEMKeyFile
and--sslCertificateSelector
options are mutually exclusive. You can only specify one.On Linux/BSD, you must specify
--sslPEMKeyFile
when TLS/SSL is enabled.On Windows or macOS, you must specify either
--sslPEMKeyFile
or--sslCertificateSelector
when TLS/SSL is enabled.Important
For Windows only, MongoDB does not support encrypted PEM files. The
mongod
fails to start if it encounters an encrypted PEM file. To securely store and access a certificate for use with TLS/SSL on Windows, use--sslCertificateSelector
.
For more information about TLS/SSL and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--sslPEMKeyPassword <value>
Deprecated since version 4.2: Use
--tlsCertificateKeyFilePassword
instead.Specifies the password to decrypt the certificate-key file (i.e.
--sslPEMKeyFile
). Use the--sslPEMKeyPassword
option only if the certificate-key file is encrypted. In all cases, themongod
redacts the password from all logging and reporting output.On Linux/BSD, if the private key in the PEM file is encrypted and you do not specify the
--sslPEMKeyPassword
option, MongoDB prompts for a passphrase. See TLS/SSL Certificate Passphrase.On macOS, if the private key in the PEM file is encrypted, you must explicitly specify the
--sslPEMKeyPassword
option. Alternatively, you can use a certificate from the secure system store (see--sslCertificateSelector
) instead of a PEM key file or use an unencrypted PEM file.On Windows, MongoDB does not support encrypted certificates. The
mongod
fails if it encounters an encrypted PEM file. Use--sslCertificateSelector
instead.
For more information about TLS/SSL and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--sslClusterFile <filename>
Deprecated since version 4.2: Use
--tlsClusterFile
instead.Specifies the
.pem
file that contains the x.509 certificate-key file for membership authentication for the cluster or replica set.On macOS or Windows, you can use the
--sslClusterCertificateSelector
option to specify a certificate from the operating system's secure certificate store instead of a PEM key file.--sslClusterFile
and--sslClusterCertificateSelector
options are mutually exclusive. You can only specify one.If
--sslClusterFile
does not specify the.pem
file for internal cluster authentication or the alternative--sslClusterCertificateSelector
, the cluster uses the.pem
file specified in the--sslPEMKeyFile
option or the certificate returned by the--sslCertificateSelector
.To use x.509 authentication,
--tlsCAFile
ornet.tls.CAFile
must be specified unless using--tlsCertificateSelector
or--net.tls.certificateSelector
. Or if using thessl
aliases,--sslCAFile
ornet.ssl.CAFile
must be specified unless using--sslCertificateSelector
ornet.ssl.certificateSelector
.For more information about TLS/SSL and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .Important
For Windows only, MongoDB does not support encrypted PEM files. The
mongod
fails to start if it encounters an encrypted PEM file. To securely store and access a certificate for use with membership authentication on Windows, use--sslClusterCertificateSelector
.
--sslCertificateSelector <parameter>=<value>
Deprecated since version 4.2: Use
--tlsCertificateSelector
instead.Available on Windows and macOS as an alternative to
--tlsCertificateKeyFile
.Specifies a certificate property to select a matching certificate from the operating system's secure certificate store to use for TLS/SSL.
--sslPEMKeyFile
and--sslCertificateSelector
options are mutually exclusive. You can only specify one.--sslCertificateSelector
accepts an argument of the format<property>=<value>
where the property can be one of the following:PropertyValue typeDescriptionsubject
ASCII stringSubject name or common name on certificatethumbprint
hex stringA sequence of bytes, expressed as hexadecimal, used to identify a public key by its SHA-1 digest.
The
thumbprint
is sometimes referred to as afingerprint
.When using the system SSL certificate store, OCSP (Online Certificate Status Protocol) is used to validate the revocation status of certificates.
The
mongod
searches the operating system's secure certificate store for the CA certificates required to validate the full certificate chain of the specified TLS/SSL certificate. Specifically, the secure certificate store must contain the root CA and any intermediate CA certificates required to build the full certificate chain to the TLS/SSL certificate. Do not use--sslCAFile
or--sslClusterCAFile
to specify the root and intermediate CA certificateFor example, if the TLS/SSL certificate was signed with a single root CA certificate, the secure certificate store must contain that root CA certificate. If the TLS/SSL certificate was signed with an intermediate CA certificate, the secure certificate store must contain the intermedia CA certificate and the root CA certificate.
--sslClusterCertificateSelector <parameter>=<value>
Deprecated since version 4.2: Use
--tlsClusterCertificateSelector
instead.Available on Windows and macOS as an alternative to
--sslClusterFile
.Specifies a certificate property to select a matching certificate from the operating system's secure certificate store to use for internal x.509 membership authentication.
--sslClusterFile
and--sslClusterCertificateSelector
options are mutually exclusive. You can only specify one.--sslClusterCertificateSelector
accepts an argument of the format<property>=<value>
where the property can be one of the following:PropertyValue typeDescriptionsubject
ASCII stringSubject name or common name on certificatethumbprint
hex stringA sequence of bytes, expressed as hexadecimal, used to identify a public key by its SHA-1 digest.
The
thumbprint
is sometimes referred to as afingerprint
.The
mongod
searches the operating system's secure certificate store for the CA certificates required to validate the full certificate chain of the specified cluster certificate. Specifically, the secure certificate store must contain the root CA and any intermediate CA certificates required to build the full certificate chain to the cluster certificate. Do not use--sslCAFile
or--sslClusterCAFile
to specify the root and intermediate CA certificate.For example, if the cluster certificate was signed with a single root CA certificate, the secure certificate store must contain that root CA certificate. If the cluster certificate was signed with an intermediate CA certificate, the secure certificate store must contain the intermedia CA certificate and the root CA certificate.
--sslClusterPassword <value>
Deprecated since version 4.2: Use
--tlsClusterPassword
instead.Specifies the password to decrypt the x.509 certificate-key file specified with
--sslClusterFile
. Use the--sslClusterPassword
option only if the certificate-key file is encrypted. In all cases, themongod
redacts the password from all logging and reporting output.On Linux/BSD, if the private key in the x.509 file is encrypted and you do not specify the
--sslClusterPassword
option, MongoDB prompts for a passphrase. See TLS/SSL Certificate Passphrase.On macOS, if the private key in the x.509 file is encrypted, you must explicitly specify the
--sslClusterPassword
option. Alternatively, you can either use a certificate from the secure system store (see--sslClusterCertificateSelector
) instead of a cluster PEM file or use an unencrypted PEM file.On Windows, MongoDB does not support encrypted certificates. The
mongod
fails if it encounters an encrypted PEM file. Use--sslClusterCertificateSelector
instead.
For more information about TLS/SSL and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--sslCAFile <filename>
Deprecated since version 4.2: Use
--tlsCAFile
instead.Specifies the
.pem
file that contains the root certificate chain from the Certificate Authority. Specify the file name of the.pem
file using relative or absolute paths.- Windows/macOS Only
- If using
--sslCertificateSelector
and/or--sslClusterCertificateSelector
, do not use--sslCAFile
to specify the root and intermediate CA certificates. Store all CA certificates required to validate the full trust chain of the--sslCertificateSelector
and/or--sslClusterCertificateSelector
certificates in the secure certificate store.
For more information about TLS/SSL and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--sslClusterCAFile <filename>
Deprecated since version 4.2: Use
--tlsClusterCAFile
instead.Specifies the
.pem
file that contains the root certificate chain from the Certificate Authority used to validate the certificate presented by a client establishing a connection. Specify the file name of the.pem
file using relative or absolute paths.--sslClusterCAFile
requires that--sslCAFile
is set.If
--sslClusterCAFile
does not specify the.pem
file for validating the certificate from a client establishing a connection, the cluster uses the.pem
file specified in the--sslCAFile
option.--sslClusterCAFile
lets you use separate Certificate Authorities to verify the client to server and server to client portions of the TLS handshake.- Windows/macOS Only
- If using
--sslCertificateSelector
and/or--sslClusterCertificateSelector
, do not use--sslClusterCAFile
to specify the root and intermediate CA certificates. Store all CA certificates required to validate the full trust chain of the--sslCertificateSelector
and/or--sslClusterCertificateSelector
certificates in the secure certificate store.
For more information about TLS/SSL and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--sslCRLFile <filename>
Deprecated since version 4.2: Use
--tlsCRLFile
instead.Specifies the
.pem
file that contains the Certificate Revocation List. Specify the file name of the.pem
file using relative or absolute paths.Note
You cannot specify a CRL file on macOS. Instead, you can use the system SSL certificate store, which uses OCSP (Online Certificate Status Protocol) to validate the revocation status of certificates. See
--tlsCertificateSelector
in MongoDB 4.2+ to use the system SSL certificate store.Starting in version 4.4, to check for certificate revocation, MongoDB
enables
the use of OCSP (Online Certificate Status Protocol) by default as an alternative to specifying a CRL file or using the system SSL certificate store.
For more information about TLS/SSL and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--sslAllowInvalidCertificates
Deprecated since version 4.2: Use
--tlsAllowInvalidCertificates
instead.Bypasses the validation checks for TLS/SSL certificates on other servers in the cluster and allows the use of invalid certificates to connect.
Note
Starting in MongoDB 4.0, if you specify any of the following x.509 authentication options, an invalid certificate is sufficient only to establish a TLS connection but it is insufficient for authentication:
--sslAllowInvalidCertificates
ornet.ssl.allowInvalidCertificates: true
for MongoDB 4.0 and later--tlsAllowInvalidCertificates
ornet.tls.allowInvalidCertificates: true
for MongoDB 4.2 and later
When using the
--sslAllowInvalidCertificates
setting, MongoDB logs a warning regarding the use of the invalid certificate.For more information about TLS/SSL and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--sslAllowInvalidHostnames
Deprecated since version 4.2: Use
--tlsAllowInvalidHostnames
instead.Disables the validation of the hostnames in TLS/SSL certificates, when connecting to other members of the replica set or sharded cluster for inter-process authentication. This allows
mongod
to connect to other members if the hostnames in their certificates do not match their configured hostname.For more information about TLS/SSL and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--sslAllowConnectionsWithoutCertificates
Deprecated since version 4.2: Use
--tlsAllowConnectionsWithoutCertificates
instead.For clients that don't provide certificates,
mongod
ormongos
encrypts the TLS/SSL connection, assuming the connection is successfully made.For clients that present a certificate, however,
mongod
performs certificate validation using the root certificate chain specified by--sslCAFile
and reject clients with invalid certificates.Use the
--sslAllowConnectionsWithoutCertificates
option if you have a mixed deployment that includes clients that do not or cannot present certificates to themongod
.For more information about TLS/SSL and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--sslDisabledProtocols <protocol(s)>
Deprecated since version 4.2: Use
--tlsDisabledProtocols
instead.Prevents a MongoDB server running with TLS/SSL from accepting incoming connections that use a specific protocol or protocols. To specify multiple protocols, use a comma separated list of protocols.
--sslDisabledProtocols
recognizes the following protocols:TLS1_0
,TLS1_1
,TLS1_2
, andTLS1_3
.On macOS, you cannot disable
TLS1_1
and leave bothTLS1_0
andTLS1_2
enabled. You must disable at least one of the other two, for example,TLS1_0,TLS1_1
.To list multiple protocols, specify as a comma separated list of protocols. For example
TLS1_0,TLS1_1
.Specifying an unrecognized protocol prevents the server from starting.
The specified disabled protocols overrides any default disabled protocols.
MongoDB disables the use of TLS 1.0 if TLS 1.1+ is available on the system. To enable the disabled TLS 1.0, specify
none
to--sslDisabledProtocols
. See Disable TLS 1.0.Members of replica sets and sharded clusters must speak at least one protocol in common.
--sslFIPSMode
Deprecated since version 4.2: Use
--tlsFIPSMode
instead.Directs the
mongod
to use the FIPS mode of the TLS/SSL library. Your system must have a FIPS compliant library to use the--sslFIPSMode
option.Note
FIPS-compatible TLS/SSL is available only in MongoDB Enterprise. See Configure MongoDB for FIPS for more information.
Profiler Options
--profile <level>
Default: 0
Configures the database profiler level. The following profiler levels are available:
LevelDescription0
The profiler is off and does not collect any data. This is the default profiler level.1
The profiler collects data for operations that take longer than the value ofslowms
.2
The profiler collects data for all operations.Warning
Profiling can degrade performance and expose unencrypted query data in the system log. Carefully consider any performance and security implications before configuring and enabling the profiler on a production deployment.
See Profiler Overhead for more information on potential performance degradation.
--slowms <integer>
Default: 100
The slow operation time threshold, in milliseconds. Operations that run for longer than this threshold are considered slow.
When
logLevel
is set to0
, MongoDB records slow operations to the diagnostic log at a rate determined byslowOpSampleRate
.At higher
logLevel
settings, all operations appear in the diagnostic log regardless of their latency with the following exception: the logging of slow oplog entry messages by the secondaries. The secondaries log only the slow oplog entries; increasing thelogLevel
does not log all oplog entries.For
mongod
instances,--slowms
affects the diagnostic log and, if enabled, the profiler.
--slowOpSampleRate <double>
Default: 1.0
The fraction of slow operations that should be profiled or logged.
--slowOpSampleRate
accepts values between 0 and 1, inclusive.--slowOpSampleRate
does not affect the slow oplog entry logging by the secondary members of a replica set. Secondary members log all oplog entries that take longer than the slow operation threshold regardless of the--slowOpSampleRate
.For
mongod
instances,--slowOpSampleRate
affects the diagnostic log and, if enabled, the profiler.
Audit Options
--auditDestination
Enables auditing and specifies where
mongod
sends all audit events.--auditDestination
can have one of the following values:ValueDescriptionsyslog
Output the audit events to syslog in JSON format. Not available on Windows. Audit messages have a syslog severity level of
info
and a facility level ofuser
.The syslog message limit can result in the truncation of audit messages. The auditing system neither detects the truncation nor errors upon its occurrence.
console
Output the audit events tostdout
in JSON format.file
Output the audit events to the file specified in--auditPath
in the format specified in--auditFormat
.Note
Available only in MongoDB Enterprise and MongoDB Atlas.
--auditFormat
Specifies the format of the output file for auditing if
--auditDestination
isfile
. The--auditFormat
option can have one of the following values:ValueDescriptionJSON
Output the audit events in JSON format to the file specified in--auditPath
.BSON
Output the audit events in BSON binary format to the file specified in--auditPath
.Printing audit events to a file in JSON format degrades server performance more than printing to a file in BSON format.
Note
Available only in MongoDB Enterprise and MongoDB Atlas.
--auditPath
Specifies the output file for auditing if
--auditDestination
has value offile
. The--auditPath
option can take either a full path name or a relative path name.Note
Available only in MongoDB Enterprise and MongoDB Atlas.
--auditFilter
Specifies the filter to limit the types of operations the audit system records. The option takes a string representation of a query document of the form:
{ <field1>: <expression1>, ... } The
<field>
can be any field in the audit message, including fields returned in the param document. The<expression>
is a query condition expression.To specify an audit filter, enclose the filter document in single quotes to pass the document as a string.
To specify the audit filter in a configuration file, you must use the YAML format of the configuration file.
Note
Available only in MongoDB Enterprise and MongoDB Atlas.
SNMP Options
Note
MongoDB Enterprise on macOS does not include support for SNMP due to SERVER-29352.
--snmp-disabled
Disables SNMP access to
mongod
. The option is incompatible with--snmp-subagent
and--snmp-master
.
--snmp-subagent
Runs SNMP as a subagent. The option is incompatible with
--snmp-disabled
.
--snmp-master
Runs SNMP as a master. The option is incompatible with
--snmp-disabled
.
inMemory Options
--inMemorySizeGB <float>
Default: 50% of physical RAM minus 1 GB.
Maximum amount of memory to allocate for the in-memory storage engine data, including indexes, the oplog (if the
mongod
is part of a replica set), sharded cluster metadata, etc.Values can range from 256MB to 10TB and can be a float.
By default, the in-memory storage engine uses 50% of physical RAM minus 1 GB.
Note
Enterprise Feature
Available in MongoDB Enterprise only.
Encryption Key Management Options
--enableEncryption
Default: false
New in version 3.2.
Enables encryption for the WiredTiger storage engine. This option must be enabled in order to pass in encryption keys and configurations.
Note
Enterprise Feature
Available in MongoDB Enterprise only.
--encryptionCipherMode <string>
Default: AES256-CBC
New in version 3.2.
The cipher mode to use for encryption at rest:
ModeDescriptionAES256-CBC
256-bit Advanced Encryption Standard in Cipher Block Chaining ModeAES256-GCM
256-bit Advanced Encryption Standard in Galois/Counter Mode
Available only on Linux.
Changed in version 4.0: MongoDB Enterprise on Windows no longer supports
AES256-GCM
as a block cipher for encryption at rest. This usage is only supported on Linux.Note
Enterprise Feature
Available in MongoDB Enterprise only.
--encryptionKeyFile <string>
New in version 3.2.
The path to the local keyfile when managing keys via process other than KMIP. Only set when managing keys via process other than KMIP. If data is already encrypted using KMIP, MongoDB throws an error.
The keyfile can contain only a single key. The key is either a 16 or 32 character string.
Requires
--enableEncryption
.Note
Enterprise Feature
Available in MongoDB Enterprise only.
--kmipKeyIdentifier <string>
New in version 3.2.
Unique KMIP identifier for an existing key within the KMIP server. Include to use the key associated with the identifier as the system key. You can only use the setting the first time you enable encryption for the
mongod
instance. Requires--enableEncryption
.If unspecified, MongoDB requests that the KMIP server create a new key to utilize as the system key.
If the KMIP server cannot locate a key with the specified identifier or the data is already encrypted with a key, MongoDB throws an error
Note
Enterprise Feature
Available in MongoDB Enterprise only.
--kmipRotateMasterKey <boolean>
Default: false
New in version 3.2.
If true, rotate the master key and re-encrypt the internal keystore.
Note
Enterprise Feature
Available in MongoDB Enterprise only.
--kmipServerName <string>
New in version 3.2.
Hostname or IP address of the KMIP server to connect to. Requires
--enableEncryption
.Starting in MongoDB 4.2.1, you can specify multiple KMIP servers as a comma-separated list, for example:
server1.example.com,server2.example.com
. On startup, themongod
attempts to establish a connection to each server in the order listed, and selects the first server to which it can successfully establish a connection. KMIP server selection occurs only at startup.When connecting to a KMIP server, the
mongod
verifies that the specified--kmipServerName
matches the Subject Alternative NameSAN
(or, ifSAN
is not present, the Common NameCN
) in the certificate presented by the KMIP server. IfSAN
is present,mongod
does not match against theCN
. If the hostname does not match theSAN
(orCN
), themongod
fails to connect.Starting in MongoDB 4.2, when performing comparison of SAN, MongoDB supports comparison of DNS names or IP addresses. In previous versions, MongoDB only supports comparisons of DNS names.
Note
Enterprise Feature
Available in MongoDB Enterprise only.
--kmipPort <number>
Default: 5696
New in version 3.2.
Port number to use to communicate with the KMIP server. Requires
--kmipServerName
. Requires--enableEncryption
.If specifying multiple KMIP servers with
--kmipServerName
, themongod
uses the port specified with--kmipPort
for all provided KMIP servers.Note
Enterprise Feature
Available in MongoDB Enterprise only.
--kmipConnectRetries <number>
Default: 0
New in version 4.4.
How many times to retry the initial connection to the KMIP server. Use together with
--kmipConnectTimeoutMS
to control how long themongod
waits for a response between each retry.Note
Enterprise Feature
Available in MongoDB Enterprise only.
--kmipConnectTimeoutMS <number>
Default: 5000
New in version 4.4.
Timeout in milliseconds to wait for a response from the KMIP server. If the
--kmipConnectRetries
setting is specified, themongod
waits for the specified interval between retries.Value must be
1000
or greater.Note
Enterprise Feature
Available in MongoDB Enterprise only.
--kmipClientCertificateSelector <string>
New in version 4.2.15,: 4.4.7, and 5.0
Available on Windows and macOS as an alternative to
--kmipClientCertificateFile
.--kmipClientCertificateFile
and--kmipClientCertificateSelector
options are mutually exclusive. You can only specify one.Specifies a certificate property in order to select a matching certificate from the operating system's certificate store to authenticate MongoDB to the KMIP server.
--kmipClientCertificateSelector
accepts an argument of the format<property>=<value>
where the property can be one of the following:PropertyValue typeDescriptionsubject
ASCII stringSubject name or common name on certificatethumbprint
hex stringA sequence of bytes, expressed as hexadecimal, used to identify a public key by its SHA-1 digest.
The
thumbprint
is sometimes referred to as afingerprint
.Note
Enterprise Feature
Available in MongoDB Enterprise only.
--kmipClientCertificateFile <string>
New in version 3.2.
Path to the
.pem
file used to authenticate MongoDB to the KMIP server. The specified.pem
file must contain both the TLS/SSL certificate and key.To use this option, you must also specify the
--kmipServerName
option.Note
On macOS or Windows, you can use a certificate from the operating system's secure store instead of a PEM key file. See
--kmipClientCertificateSelector
.Note
Enterprise Feature
Available in MongoDB Enterprise only.
--kmipClientCertificatePassword <string>
New in version 3.2.
The password (if one exists) for the client certificate passed into
--kmipClientCertificateFile
. Is used for authenticating MongoDB to the KMIP server. Requires that a--kmipClientCertificateFile
be provided.Note
Enterprise Feature
Available in MongoDB Enterprise only.
--kmipServerCAFile <string>
New in version 3.2.
Path to CA File. Used for validating secure client connection to KMIP server.
Note
On macOS or Windows, you can use a certificate from the operating system's secure store instead of a PEM key file. See
--kmipClientCertificateSelector
. When using the secure store, you do not need to, but can, also specify the--kmipServerCAFile
.
--eseDatabaseKeyRollover
New in version 4.2.
Roll over the encrypted storage engine database keys configured with
AES256-GCM
cipher.When
mongod
instance is started with this option, the instance rotates the keys and exits.Note
Enterprise Feature
Available in MongoDB Enterprise only.