Expand volume

You can expand the storage volume size of each pod.

Before you start

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

kubectl get cluster mycluster -n demo

Steps

There are two ways to expand volume.

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-volumeexpansion
     namespace: demo
   spec:
     clusterName: mycluster
     type: VolumeExpansion
     volumeExpansion:
     - componentName: broker
       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.

   apiVersion: apps.kubeblocks.io/v1alpha1
   kind: Cluster
   metadata:
     name: mycluster
     namespace: demo 
   spec:
     clusterDefinitionRef: kafka
     clusterVersionRef: kafka-3.3.2
     componentSpecs:
     - name: kafka 
       componentDefRef: kafka
       volumeClaimTemplates:
       - name: data
         spec:
           accessModes:
             - ReadWriteOnce
           resources:
             requests:
               storage: 40Gi # Change the volume storage size.
     terminationPolicy: Delete

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