Expand volume

You can expand the storage volume size of each pod.

note

Volume expansion triggers a restart and the pod role may change after the operation.

Before you start

Check whether the cluster STATUS is Running. Otherwise, the following operations may fail.

kubectl get cluster mycluster -n demo
>
NAME        CLUSTER-DEFINITION   VERSION        TERMINATION-POLICY   STATUS    AGE
mycluster   redis                redis-7.0.6    Delete               Running   4d18h

Steps

There are two ways to apply volume expansion.

OpsRequest

1. Apply an OpsRequest. Change the value of storage according to your need and run the command below to expand the volume of a cluster.

   kubectl apply -f - <<EOF
   apiVersion: apps.kubeblocks.io/v1alpha1
   kind: OpsRequest
   metadata:
     name: ops-volume-expansion
     namespace: demo
   spec:
     clusterName: mycluster
     type: VolumeExpansion
     volumeExpansion:
     - componentName: redis
       volumeClaimTemplates:
       - name: data
         storage: "40Gi"
   EOF

2. Validate the volume expansion operation.

   kubectl get ops -n demo
   >
   NAMESPACE   NAME                   TYPE              CLUSTER     STATUS    PROGRESS   AGE
   demo        ops-volume-expansion   VolumeExpansion   mycluster   Succeed   3/3        6m

3. Check whether the corresponding cluster resources change.

   kubectl describe cluster mycluster -n demo
   >
   ......
   Volume Claim Templates:
      Name:  data
      Spec:
        Access Modes:
          ReadWriteOnce
        Resources:
          Requests:
            Storage:   40Gi

Edit cluster YAML file

1. Change the value of spec.componentSpecs.volumeClaimTemplates.spec.resources in the cluster YAML file.

   spec.componentSpecs.volumeClaimTemplates.spec.resources is the storage resource information of the pod and changing this value triggers the volume expansion of a cluster.

   spec:
     affinity:
       podAntiAffinity: Preferred
       topologyKeys:
       - kubernetes.io/hostname
     clusterDefinitionRef: redis
     clusterVersionRef: redis-7.0.6
     componentSpecs:
     - componentDefRef: redis
       enabledLogs:
       - running
       disableExporter: true
       name: redis
       replicas: 1
       resources:
         limits:
           cpu: "0.5"
           memory: 0.5Gi
         requests:
           cpu: "0.5"
           memory: 0.5Gi
       serviceAccountName: kb-redis
       volumeClaimTemplates:
       - name: data
         spec:
           accessModes:
           - ReadWriteOnce
           resources:
             requests:
               storage: 40Gi # Change the volume storage size.

2. Check whether the corresponding cluster resources change.

   kubectl describe cluster mycluster -n demo
   >
   ......
   Volume Claim Templates:
      Name:  data
      Spec:
        Access Modes:
          ReadWriteOnce
        Resources:
          Requests:
            Storage:   40Gi