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Excerpt
nameExcerpt: MongoDB Backup/Restore
Note

The examples given below make use of so called “ephemeral disk space”.

This means that disk space may become an issue if the database is very big and disk space is limited. The ephemeral disk space is located in /var/lib/kubelet and /var/lib/containers. If you have /var/lib placed on a separate disk, you con check the available space with the following command:

Code Block
df -h /var/lib

Backup MongoDB

First, open

Single node MongoDB

Open a shell to your MongoDB node.

To backup the MongoDB instance, run mongodump with the following command-line options:

Code Block
mongodump --gzip --archive=/tmp/mongobackup_$(date "+%Y.%m.%d_%H.%M.%S").gz

After the backup has completed, there are several ways to retrieve the compressed backup file from the container. Here is an example for Kubernetes:

Code Block
kubectl cp cdcm/cdcm-mongodb-0:/tmp/mongobackup_<date>.gz .

The <date> portion needs to be adapted to reflect the actual file.

Multi node MongoDB

Open a shell to your (primary) MongoDB node.

To backup the MongoDB instance, run mongodump with the following command-line options:

Code Block
mongodump --oplog --gzip --archive=/tmp/mongobackup_$(date "+%Y.%m.%d_%H.%M.%S").gz

The --oplog option captures incoming write operations during the mongodump operation to ensure that the backups reflect a consistent data state.

After the backup has completed, there are several ways to retrieve the compressed file from the container. Here is an example for Kubernetes:

Code Block
kubectl cp cdcm/cdcm-mongodb-0:/tmp/mongobackup_<date>.gz .

The <date> portion needs to be adapted to reflect the actual file.

Restore MongoDB

First, upload the backup to the target instance.

Note

Make sure that you are using the correct context!

Once again, this example applies to Kubernetes:

Code Block
kubectl cp <archive> cdcm-mongodb-0:/tmp/

To restore the a single node MongoDB instance, run mongorestore with the following command-line options:

Code Block
mongorestore --gzip --archive=<path-to-archive>

Restoring a multi node MongoDB

If you used the --oplog option with mongodump, you need to run mongorestore with the --oplogReplay option:

Code Block
mongorestore --gzip --oplogReplay --archive=<path-to-archive>

Please find the complete documentation at https://www.mongodb.com/docs/manual/tutorial/backup-and-restore-tools/