Volume Expansion for RocketMQ

Volume expansion increases the storage allocated to broker pods. The underlying StorageClass must support volume expansion.

Prerequisites

Before proceeding, verify your environment meets these requirements:

• A functional Kubernetes cluster (v1.21+ recommended)
• kubectl v1.21+ installed and configured with cluster access
• Helm installed (installation guide)
• KubeBlocks installed (installation guide)
• RocketMQ Add-on installed and a RocketMQ cluster running (see Quickstart)

kubectl get storageclass

Expand the Broker Volume

The broker data PVC stores message logs. Use the sharding group name broker to expand from 10Gi to 20Gi:

kubectl apply -f - <<EOF
apiVersion: operations.kubeblocks.io/v1alpha1
kind: OpsRequest
metadata:
  name: rocketmq-volumeexpansion
  namespace: demo
spec:
  clusterName: rocketmq-cluster
  type: VolumeExpansion
  volumeExpansion:
    - componentName: broker
      volumeClaimTemplates:
        - name: data
          storage: 20Gi
EOF

Monitor progress:

kubectl get opsrequest rocketmq-volumeexpansion -n demo -w

NAME                      TYPE              CLUSTER            STATUS    PROGRESS   AGE
rocketmq-volumeexpansion  VolumeExpansion   rocketmq-cluster   Succeed   1/1        60s

Verify the new storage size:

kubectl get pvc -n demo -l app.kubernetes.io/instance=rocketmq-cluster

NAME                                    STATUS   VOLUME   CAPACITY   ACCESS MODES   STORAGECLASS   AGE
data-rocketmq-cluster-broker-t9j-0     Bound    ...      20Gi       RWO            standard       10m

Cleanup

kubectl delete opsrequest rocketmq-volumeexpansion -n demo --ignore-not-found