Stop/Start a cluster

You can stop/start a cluster to save computing resources. When a cluster is stopped, the computing resources of this cluster are released, which means the pods of Kubernetes are released, but the storage resources are reserved. You can start this cluster again by snapshots if you want to restore the cluster resources.

Stop a cluster

1. Configure the name of your cluster and run the command below to stop this cluster.

   Apply an OpsRequest to restart a cluster.

   kubectl apply -f - <<EOF
   apiVersion: apps.kubeblocks.io/v1alpha1
   kind: OpsRequest
   metadata:
     name: mycluster-stop
     namespace: demo
   spec:
     clusterName: mycluster
     type: Stop
   EOF
   

   kubectl edit cluster mycluster -n demo
   

   Configure replicas as 0 to delete pods.

   ...
   spec:
     clusterDefinitionRef: starrocks-ce
     clusterVersionRef: starrocks-ce-3.1.1
     terminationPolicy: Delete
     affinity:
       podAntiAffinity: Preferred
       topologyKeys:
       - kubernetes.io/hostname
     tolerations:
       - key: kb-data
         operator: Equal
         value: 'true'
         effect: NoSchedule
     componentSpecs:
     - name: fe
       componentDefRef: fe
       serviceAccountName: kb-starrocks-cluster
       replicas: 0 # Change this value
     - name: be
       componentDefRef: be
       replicas: 0 # Change this value
   

   kbcli cluster stop mycluster -n demo
   

2. Check the status of the cluster to see whether it is stopped.

   kubectl get cluster mycluster -n demo
   

   kbcli cluster list mycluster -n demo
   

Start a cluster

1. Configure the name of your cluster and run the command below to start this cluster.

   Apply an OpsRequest to start a cluster.

   kubectl apply -f - <<EOF
   apiVersion: apps.kubeblocks.io/v1alpha1
   kind: OpsRequest
   metadata:
     name: ops-start
     namespace: demo
   spec:
     clusterName: mycluster
     type: Start
   EOF
   

   kubectl edit cluster mycluster -n demo
   

   Change replicas back to the original amount to start this cluster again.

   spec:
     clusterDefinitionRef: starrocks-ce
     clusterVersionRef: starrocks-ce-3.1.1
     terminationPolicy: Delete
     affinity:
       podAntiAffinity: Preferred
       topologyKeys:
       - kubernetes.io/hostname
     tolerations:
       - key: kb-data
         operator: Equal
         value: 'true'
         effect: NoSchedule
     componentSpecs:
     - name: fe
       componentDefRef: fe
       serviceAccountName: kb-starrocks-cluster
       replicas: 1 # Change this value
     - name: be
       componentDefRef: be
       replicas: 2 # Change this value
   

   kbcli cluster start mycluster -n demo
   

2. Check the status of the cluster to see whether it is running again.

   kubectl get cluster mycluster -n demo
   

   kbcli cluster list mycluster -n demo