applyOps: (KeyNotFound) No keys found for HMAC that is valid for time

Hi there!

Since there wasn’t a reply to your message, I tried to run it by our documentation bot. Here is the response I got

Based on the error message you provided, it seems that you are encountering a “KeyNotFound” error during the restore process. This error occurs when MongoDB is unable to find the keys necessary for the HMAC validation during the restore.

To restore without encountering this error, you can try the following steps:

1. Make sure that the data files stored in your backup medium are accessible on the host. This may involve mounting the backup volume or extracting the data to disk using a software utility or another tool.
2. Copy the mongod data files from the backup data location to the data directory on the target host. You can use the following command to copy the files:

cp -a /backup/mongodb/path/to/mongodb /path/to/mongodb

The -a option recursively copies the contents of the source path to the destination path while preserving folder and file permissions.
3. Comment out or omit the following configuration file settings in the mongod.conf file:

# replication#   replSetName: myShardName# sharding#   clusterRole: shardsvr

4. Start the mongod process using the --config option to specify the full path to the configuration file:

mongod --config /path/to/mongodb/mongod.conf

If you are restoring from a namespace-filtered snapshot, you should also specify the --restore option:

mongod --config /path/to/mongod/mongod.conf --restore

If you are performing a manual restoration of a Cloud Manager or Ops Manager backup, you need to specify the disableLogicalSessionCacheRefresh server parameter prior to startup:

mongod --config /path/to/mongodb/mongod.conf \  --setParameter disableLogicalSessionCacheRefresh=true

If you have mongod configured to run as a system service, start it using the recommended process for your system service manager.
5. Once the mongod process starts, you can connect to it using the mongo shell to verify the restore process.

Please note that these steps are based on the MongoDB documentation for restoring a sharded cluster. If you are not restoring a sharded cluster or if these steps do not resolve the issue, please provide more details

Related resources:

• MongoDB Atlas Backup & Recovery - Lesson 1: Back Up and Recover an Atlas Free Tier - Learn
• mongorestore Examples
• Restore a Sharded Cluster
• Back Up and Restore with MongoDB Tools