Backup from cStor

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