Expand volume
You can expand the storage volume size of each pod.
Volume expansion triggers pod restart and the primary pod 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 mysql mysql-8.0.33 Delete Running 4d18h
Steps
There are two ways to apply volume expansion.
- OpsRequest
- Edit cluster YAML file
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: mysql
volumeClaimTemplates:
- name: data
storage: "40Gi"
EOFValidate 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 6mCheck 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
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: mysql
clusterVersionRef: mysql-8.0.33
componentSpecs:
- name: mysql
componentDefRef: mysql
replicas: 2
volumeClaimTemplates:
- name: data
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 40Gi # Change the volume storage size.
terminationPolicy: DeleteCheck 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