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Steps to take a Backup from cStor for Distributed DBs (Cassandra)

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4.1.x

Step 1: Backup from CStor Cluster#

In the current setup, we have a CStor cluster serving as the source, with Cassandra running as a StatefulSet, utilizing CStor volumes.

Command

kubectl get pods -n cassandra

Example Output

NAME READY STATUS RESTARTS AGE
cassandra-0 1/1 Running 0 6m22s
cassandra-1 1/1 Running 0 4m23s
cassandra-2 1/1 Running 0 2m15s

Command

kubectl get pvc -n cassandra

Example Output

NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
data-cassandra-0 Bound pvc-05c464de-f273-4d04-b915-600bc434d762 3Gi RWO cstor-csi-disk 6m37s
data-cassandra-1 Bound pvc-a7ac4af9-6cc9-4722-aee1-b8c9e1c1f8c8 3Gi RWO cstor-csi-disk 4m38s
data-cassandra-2 Bound pvc-0980ea22-0b4b-4f02-bc57-81c4089cf55a 3Gi RWO cstor-csi-disk 2m30s

Command

kubectl get cvc -n openebs

Example Output

NAME CAPACITY STATUS AGE
pvc-05c464de-f273-4d04-b915-600bc434d762 3Gi Bound 6m47s
pvc-0980ea22-0b4b-4f02-bc57-81c4089cf55a 3Gi Bound 2m40s
pvc-a7ac4af9-6cc9-4722-aee1-b8c9e1c1f8c8 3Gi Bound 4m48s

Step 2: Velero Installation#

To initiate Velero, execute the following command:

velero install --use-node-agent --provider gcp --plugins velero/velero-plugin-for-gcp:v1.6.0 --bucket velero-backup-datacore --secret-file ./credentials-velero --uploader-type restic

Verify the Velero namespace for Node Agent and Velero pods:

kubectl get pods -n velero

Step 3: Create a Sample Database#

In this example, we create a new database with sample data in Cassandra, a distributed database.

The data is distributed across all replication instances.

Step 4: Taking Velero Backup#

Cassandra is a distributed wide-column store database running in clusters called rings. Each node in a Cassandra ring stores some data ranges and replicates others for scaling and fault tolerance. To back up Cassandra, we must back up all three volumes and restore them at the destination.

Velero offers two approaches for discovering pod volumes to back up using File System Backup (FSB):

  • Opt-in Approach: Annotate every pod containing a volume to be backed up with the volume's name.
  • Opt-out Approach: Back up all pod volumes using FSB, with the option to exclude specific volumes.

Opt-in:

In this case, we opt-in all Cassandra pods and volumes for backup:

kubectl -n cassandra annotate pod/cassandra-0 backup.velero.io/backup-volumes=data
kubectl -n cassandra annotate pod/cassandra-1 backup.velero.io/backup-volumes=data
kubectl -n cassandra annotate pod/cassandra-2 backup.velero.io/backup-volumes=data

To perform the backup, run the following command:

velero backup create cassandra-backup-19-09-23 --include-namespaces cassandra --default-volumes-to-fs-backup --wait

Check the backup status, run the following command:

velero get backup | grep cassandra-backup-19-09-23

See Also#

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