Providing Backups

Percona Server for MongoDB Operator allows doing cluster backup in two ways. Scheduled backups are configured in the deploy/cr.yaml file to be executed automatically in proper time. On-demand backups can be done manually at any moment. Both ways are using the Percona Backup for MongoDB tool to do the job.

The backup process is controlled by the Backup Coordinator daemon residing in the Kubernetes cluster alongside the Percona Server for MongoDB, while actual backup images are stored separately on any Amazon S3 compatible storage.

Making scheduled backups

Since backups are stored separately on the Amazon S3, a secret with AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY should be present on the Kubernetes cluster. These keys should be saved to the deploy/backup-s3.yaml file and applied with the appropriate command, e.g. kubectl apply -f deploy/backup-s3.yaml (for Kubernetes).

Backups schedule is defined in the backup section of the deploy/cr.yaml file. This section contains three subsections:

  • s3 subsection contains data needed to access the Amazon S3 cloud to store backups.
  • coordinator subsections allows to configure Kubernetes limits and claims for the Percona Backup for MongoDB Coordinator daemon.
  • tasks subsection allows to actually schedule backups (the schedule is specified in crontab format).

The options within these three subsections are explained in the Operator Options.

Making on-demand backup

To make on-demand backup, user should run the PBM Control tool inside of the coordinator container, supplying it with needed options, like in the following example:

   kubectl run -it --rm pbmctl --image=percona/percona-server-mongodb-operator:0.2.1-backup-pbmctl --restart=Never -- --server-address=my-cluster-name-backup-coordinator:10001 run backup --destination-type=aws --compression-algorithm=gzip --description=my-backup

Restore the cluster from a previously saved backup

Previously saved backups can be restored with a special backup restore job, configured with the deploy/backup-restore.yaml file. Following keys in this file should be edited before the job can be run:

  • Both entries of the key should be the same as the s3.secret key value in the deploy/cr.yaml backup section
  • BUCKET_NAME is the S3 bucket name, and it should be same as the s3.bucket key value in the deploy/cr.yaml backup section
  • BACKUP_NAME is the unique name (without the.dump.gz suffix) of the particular backup to be restored (the list of available backups can be seen in the S3 browser)
  • MONGODB_DSN is a connect string starting with mongodb+srv://BACKUP-USER-HERE:BACKUP-PASSWORD-HERE..., where BACKUP-USER-HERE and BACKUP-PASSWORD-HERE parts should be changed to the proper username and password of the backup user, same as ones in deploy/mongodb-users.yaml secret file.

When the editing is done, the restore job can be started in the following way (e.g. on the OpenShift platform):

   oc create -f deploy/backup-restore.yaml