mongos
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Synopsis
For a sharded cluster, the mongos
instances provide the interface between the client applications and the
sharded cluster. The mongos
instances route queries and
write operations to the shards. From the perspective of the
application, a mongos
instance behaves identically to
any other MongoDB instance.
Considerations
Never change the name of the
mongos
binary.mongos
supports hedged reads to minimize latencies.MongoDB disables support for TLS 1.0 encryption on systems where TLS 1.1+ is available.
The
mongos
binary cannot connect tomongod
instances whose feature compatibility version (FCV) is greater than that of themongos
. For example, you cannot connect a MongoDB 5.0 versionmongos
to a 6.0 sharded cluster with FCV set to 6.0. You can, however, connect a MongoDB 5.0 versionmongos
to a 6.0 sharded cluster with FCV set to 5.0.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
Note
MongoDB deprecates the SSL options and instead adds new corresponding TLS options.
MongoDB adds
--tlsClusterCAFile
/net.tls.clusterCAFile
.
Note
MongoDB 5.0 removes the
--serviceExecutor
command-line option and the correspondingnet.serviceExecutor
configuration 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
mongos
. The options are equivalent to the command-line configuration options. See Self-Managed Configuration File Options for more information.Ensure the configuration file uses ASCII encoding. The
mongos
instance does not support configuration files with non-ASCII encoding, including UTF-8.
--configExpand <none|rest|exec>
Default: none
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.
mongos
does not expand expansion directives.mongos
fails to start if any configuration file settings use expansion directives.rest
mongos
expands__rest
expansion directives when parsing the configuration file.exec
mongos
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
, themongos
returns an error and terminates.See Externally Sourced Configuration File Values for Self-Managed Deployments 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
.
--quiet
Runs
mongos
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
The TCP port on which the
mongos
instance listens for client connections.Changed in version 6.0.12: The
--port
option accepts a range of values between0
and65535
. Setting the port to0
configuresmongos
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
mongos
should listen for client connections. You may attachmongos
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
Important
To avoid configuration updates due to IP address changes, use DNS hostnames instead of IP addresses. It is particularly important to use a DNS hostname instead of an IP address when configuring replica set members or sharded cluster members.
Use hostnames instead of IP addresses to configure clusters across a split network horizon. Starting in MongoDB 5.0, nodes that are only configured with an IP address fail startup validation and do not start.
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 for Self-Managed Deployments. At minimum, consider enabling authentication and hardening network infrastructure.
For more information about IP Binding, refer to the IP Binding in Self-Managed Deployments 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 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 causesmongos
to throw an error and terminate.The command-line option
--bind
overrides the configuration file settingnet.bindIp
.
--bind_ip_all
If specified, the
mongos
instance binds to all IPv4 addresses (i.e.0.0.0.0
). Ifmongos
starts with--ipv6
,--bind_ip_all
also binds to all IPv6 addresses (i.e.::
).mongos
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 for Self-Managed Deployments. At minimum, consider enabling authentication and hardening network infrastructure.
For more information about IP Binding, refer to the IP Binding in Self-Managed Deployments documentation.
Alternatively, you can set the
--bind_ip
option to::,0.0.0.0
or 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.
--listenBacklog <number>
Default: Target system
SOMAXCONN
constantThe 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
mongos
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.
This is particularly useful for a
mongos
if you have a client that creates multiple connections and allows them to timeout rather than closing them.In this case, set
maxIncomingConnections
to a value slightly higher than the maximum number of connections that the client creates, or the maximum size of the connection pool.This setting prevents the
mongos
from causing connection spikes on the individual shards. Spikes like these may disrupt the operation and memory allocation of the sharded cluster.
--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 will move any existing log file rather than overwrite 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.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
mongos
instance restarts. Without this option,mongod
will back up the existing log and create a new file.
--logRotate <string>
Default: rename
Determines the behavior for the
logRotate
command when rotating the server log and/or the audit log. 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
.
--redactClientLogData
Available in MongoDB Enterprise only.
A
mongos
running with--redactClientLogData
redacts any message accompanying a given log event before logging. This prevents themongos
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
mongos
logs events such as those related to CRUD operations, sharding metadata, etc. It is possible that themongos
may expose PII as a part of these logging operations. Amongos
running with--redactClientLogData
removes any message accompanying these events before being output to the log, effectively removing the PII.Diagnostics on a
mongos
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
mongos
, usesetParameter
with theredactClientLogData
parameter to configure this setting.
--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
--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
mongos
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
impliesclient authorization
. See Self-Managed Internal/Membership Authentication for more information.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 for a Self-Managed Deployment. You can specify multiple
setParameter
fields.
--noscripting
Disables the scripting engine. When disabled, you cannot use operations that perform server-side execution of JavaScript code, such as the
$where
query operator,mapReduce
command,$accumulator
, and$function
.If you do not use these operations, disable server-side scripting.
--nounixsocket
Disables listening on the UNIX domain socket.
--nounixsocket
applies only to Unix-based systems.The
mongos
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
mongos
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
mongos
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
mongos
process in the background. The--fork
option is not supported on Windows.By default
mongos
does not run as a daemon. You runmongos
as a daemon by using either--fork
or a controlling process that handles daemonization, such asupstart
orsystemd
.Using the
--fork
option requires that you configure log output for themongos
with one of the following:
--transitionToAuth
Allows the
mongos
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
mongos
creates an authenticated connection with anymongod
ormongos
in the deployment using a matching keyfile. If the security mechanisms do not match, themongos
utilizes a non-authenticated connection instead.A
mongos
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
mongos
running with internal authentication and without--transitionToAuth
requires clients to connect using user access controls. Update clients to connect to themongos
using the appropriate user prior to restartingmongos
without--transitionToAuth
.
--networkMessageCompressors <string>
Default: snappy,zstd,zlib
Specifies the default compressor(s) to use for communication between this
mongos
instance and:other members of the sharded cluster
drivers that support the
OP_COMPRESSED
message format.
MongoDB supports the following compressors:
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
mongosh
specifies the following network compressorszlib,snappy
and themongod
specifiessnappy,zlib
, messages betweenmongosh
andmongod
useszlib
.If the parties do not share at least one common compressor, messages between the parties are uncompressed. For example, if
mongosh
specifies the network compressorzlib
andmongod
specifiessnappy
, messages betweenmongosh
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 uses 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 mongos --timeZoneInfo timezonedb-2017b/ 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 5.0, download the time zone database. and use the
timeZoneInfo
parameter.
--outputConfig
Outputs the
mongos
instance's configuration options, formatted in YAML, tostdout
and exits themongos
instance. For configuration options that uses Externally Sourced Configuration File Values for Self-Managed Deployments,--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:
Sharded Cluster Options
--configdb <replicasetName>/<config1>,<config2>...
Specifies the configuration servers for the sharded cluster.
Config servers for sharded clusters are deployed as a replica set. The replica set config servers must run the WiredTiger storage engine.
Specify the config server replica set name and the hostname and port of at least one of the members of the config server replica set.
sharding: configDB: <configReplSetName>/cfg1.example.net:27019, cfg2.example.net:27019,... The
mongos
instances for the sharded cluster must specify the same config server replica set name but can specify hostname and port of different members of the replica set.
--localThreshold
Default: 15
Specifies the ping time, in milliseconds, that
mongos
uses to determine which secondary replica set members to pass read operations from clients. The default value of15
corresponds to the default value in all of the client drivers.When
mongos
receives a request that permits reads to secondary members, it:Finds the member of the set with the lowest ping time.
Constructs a list of replica set members that is within a ping time of 15 milliseconds of the nearest suitable member of the set.
If you specify a value for the
--localThreshold
option,mongos
constructs the list of replica members that are within the latency allowed by this value.Selects a member to read from at random from this list.
The ping time used for a member compared by the
--localThreshold
setting is a moving average of recent ping times, calculated at most every 10 seconds. As a result, some queries may reach members above the threshold until themongos
recalculates the average.See the Read Preference for Replica Sets section of the read preference documentation for more information.
TLS Options
--tlsMode <mode>
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>
Note
On macOS or Windows, you can use a certificate from the operating system's secure store instead of specifying a PEM file. See
--tlsCertificateSelector
.Specifies the
.pem
file that contains both the TLS certificate and key.On Linux/BSD, you must specify
--tlsCertificateKeyFile
when TLS is enabled.On Windows or macOS, you must specify either
--tlsCertificateKeyFile
or--tlsCertificateSelector
when TLS is enabled.
For more information about TLS and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--tlsCertificateKeyFilePassword <value>
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, themongos
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 or Windows, 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.
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>
Note
On macOS or Windows, you can use a certificate from the operating system's secure store instead of a PEM file. See
--tlsClusterCertificateSelector
.Specifies the
.pem
file that contains the x.509 certificate-key file for membership authentication for the cluster or replica set.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
.mongod
/mongos
logs a warning on connection if the presented x.509 certificate expires within30
days of themongod/mongos
host system time.For more information about TLS and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--tlsClusterPassword <value>
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, themongos
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 or Windows, 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.
For more information about TLS and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--tlsCAFile <filename>
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.On macOS or Windows, you can use a certificate from the operating system's secure store instead of a PEM key file. See
--tlsCertificateSelector
. When using the secure store, you do not need to, but can, also specify the--tlsCAFile
.For more information about TLS and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--tlsClusterCAFile <filename>
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.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.On macOS or Windows, you can use a certificate from the operating system's secure store instead of a PEM key file. See
--tlsClusterCertificateSelector
. When using the secure store, you do not need to, but can, also specify the--tlsClusterCAFile
.Requires that
--tlsCAFile
is set.For more information about TLS and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--tlsCertificateSelector <parameter>=<value>
Note
Available on Windows and macOS as an alternative to
--tlsCertificateKeyFile
.The
--tlsCertificateKeyFile
and--tlsCertificateSelector
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.
--tlsCertificateSelector
accepts an argument of the format<property>=<value>
where the property can be one of the following:PropertyValue typeDescriptionsubject
ASCII string
Subject name or common name on certificate
thumbprint
hex string
A 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.
Note
You cannot use the
rotateCertificates
command or thedb.rotateCertificates()
shell method when usingnet.tls.certificateSelector
or--tlsCertificateSelector
set tothumbprint
--tlsClusterCertificateSelector <parameter>=<value>
Note
Available on Windows and macOS as an alternative to
--tlsClusterFile
.--tlsClusterFile
and--tlsClusterCertificateSelector
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 use for internal authentication.
--tlsClusterCertificateSelector
accepts an argument of the format<property>=<value>
where the property can be one of the following:PropertyValue typeDescriptionsubject
ASCII string
Subject name or common name on certificate
thumbprint
hex string
A 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
.mongod
/mongos
logs a warning on connection if the presented x.509 certificate expires within30
days of themongod/mongos
host system time.
--tlsCRLFile <filename>
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. To use the system SSL certificate store, see
--tlsCertificateSelector
.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 .
--tlsAllowConnectionsWithoutCertificates
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,
mongos
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 themongos
.For more information about TLS and MongoDB, see Configure
mongod
andmongos
for TLS/SSL and TLS/SSL Configuration for Clients .
--tlsAllowInvalidCertificates
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
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
mongos
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 .
--tlsDisabledProtocols <protocol(s)>
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
.Members of replica sets and sharded clusters must speak at least one protocol in common.
--tlsFIPSMode
Directs the
mongos
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.
Audit Options
--auditCompressionMode
New in version 5.3.
Specifies the compression mode for audit log encryption. You must also enable audit log encryption using either
--auditEncryptionKeyUID
or--auditLocalKeyFile
.--auditCompressionMode
can be set to one of these values:ValueDescriptionzstd
Use the zstd algorithm to compress the audit log.
none
(default)Do not compress the audit log.
Note
Available only in MongoDB Enterprise. MongoDB Enterprise and Atlas have different configuration requirements.
--auditDestination
Enables auditing and specifies where
mongos
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 to
stdout
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.
--auditEncryptionKeyUID
New in version 6.0.
Specifies the unique identifier of the Key Management Interoperability Protocol (KMIP) key for audit log encryption.
You cannot use
--auditEncryptionKeyUID
and--auditLocalKeyFile
together.Note
Available only in MongoDB Enterprise. MongoDB Enterprise and Atlas have different configuration requirements.
--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.
--auditLocalKeyFile
New in version 5.3.
Specifies the path and file name for a local audit key file for audit log encryption.
Note
Only use
--auditLocalKeyFile
for testing because the key is not secured. To secure the key, use--auditEncryptionKeyUID
and an external Key Management Interoperability Protocol (KMIP) server.You cannot use
--auditLocalKeyFile
and--auditEncryptionKeyUID
together.Note
Available only in MongoDB Enterprise. MongoDB Enterprise and Atlas have different configuration requirements.
--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.
Profiler Options
--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.For
mongos
instances, affects the diagnostic log only and not the profiler since profiling is not available onmongos
.
--slowOpSampleRate <double>
Default: 1.0
The fraction of slow operations that should be logged.
--slowOpSampleRate
accepts values between 0 and 1, inclusive.For
mongos
instances,--slowOpSampleRate
affects the diagnostic log only and not the profiler since profiling is not available onmongos
.
LDAP Authentication and Authorization Options
--ldapServers <host1>:<port>,<host2>:<port>,...,<hostN>:<port>
Available in MongoDB Enterprise only.
The LDAP server against which the
mongos
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
mongos
usingsetParameter
.If unset,
mongos
cannot use LDAP authentication or authorization.
--ldapValidateLDAPServerConfig <boolean>
Available in MongoDB Enterprise
A flag that determines if the
mongos
instance checks the availability of theLDAP server(s)
as part of its startup:If
true
, themongos
instance performs the availability check and only continues to start up if the LDAP server is available.If
false
, themongos
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
mongos
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,
mongos
doesn't attempt to bind to the LDAP server.This setting can be configured on a running
mongos
usingsetParameter
.Note
Windows MongoDB deployments can use
--ldapBindWithOSDefaults
instead of--ldapQueryUser
and--ldapQueryPassword
. You cannot specify both--ldapQueryUser
and--ldapBindWithOSDefaults
at the same time.
--ldapQueryPassword <string>
Available in MongoDB Enterprise only.
The password used to bind to an LDAP server when using
--ldapQueryUser
. You must use--ldapQueryPassword
with--ldapQueryUser
.If unset,
mongos
doesn't attempt to bind to the LDAP server.This setting can be configured on a running
mongos
usingsetParameter
.Note
Windows MongoDB deployments can use
--ldapBindWithOSDefaults
instead of--ldapQueryPassword
and--ldapQueryPassword
. You cannot specify both--ldapQueryPassword
and--ldapBindWithOSDefaults
at the same time.
--ldapBindWithOSDefaults <bool>
Default: false
Available in MongoDB Enterprise for the Windows platform only.
Allows
mongos
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
Available in MongoDB Enterprise only.
The method
mongos
uses to authenticate to an LDAP server. Use with--ldapQueryUser
and--ldapQueryPassword
to connect to the LDAP server.--ldapBindMethod
supports the following values:simple
-mongos
uses simple authentication.sasl
-mongos
uses SASL protocol for authentication
If you specify
sasl
, you can configure the available SASL mechanisms using--ldapBindSaslMechanisms
.mongos
defaults to usingDIGEST-MD5
mechanism.
--ldapBindSaslMechanisms <string>
Default: DIGEST-MD5
Available in MongoDB Enterprise only.
A comma-separated list of SASL mechanisms
mongos
can use when authenticating to the LDAP server. Themongos
and the LDAP server must agree on at least one mechanism. Themongos
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
mongos
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 on Self-Managed Deployments, verify the following for themongos
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
mongos
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 allowmongos
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
Available in MongoDB Enterprise only.
By default,
mongos
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 betweenmongos
and the LDAP server.Warning
Setting
--ldapTransportSecurity
tonone
transmits plaintext information and possibly credentials betweenmongos
and the LDAP server.
--ldapTimeoutMS <long>
Default: 10000
Available in MongoDB Enterprise only.
The amount of time in milliseconds
mongos
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
mongos
usingsetParameter
.
--ldapUserToDNMapping <string>
Available in MongoDB Enterprise only.
Maps the username provided to
mongos
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 by
substitution
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 the
match
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.mongos
executes the query against the LDAP server to retrieve the LDAP DN for the authenticated user.mongos
requires exactly one returned result for the transformation to be successful, ormongos
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,
mongos
steps through each document in the array in the given order, checking the authentication username against thematch
filter. If a match is found,mongos
applies the transformation and uses the output for authenticating the user.mongos
does not check the remaining documents in the array.If the given document does not match the provided authentication name,
mongos
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,mongos
returns an error.mongos
also returns an error if one of the transformations cannot be evaluated due to networking or authentication failures to the LDAP server.mongos
rejects the connection request and does not check the remaining documents in the array.Starting in MongoDB 5.0,
--ldapUserToDNMapping
accepts an empty string""
or empty array[ ]
in place of a mapping documnent. If providing an empty string or empty array to--ldapUserToDNMapping
, MongoDB maps the authenticated username as the LDAP DN. Previously, providing an empty mapping document would cause mapping to fail.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)"
.mongos
executes this query against the LDAP server, returning the result"cn=bob,ou=dba,dc=example,dc=com"
.If
--ldapUserToDNMapping
is unset,mongos
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
mongos
using thesetParameter
database command.
Additional Options
--ipv6
Enables IPv6 support.
mongos
disables IPv6 support by default.Setting
--ipv6
does not direct themongos
to listen on any local IPv6 addresses or interfaces. To configure themongos
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
.