Stop/Start PostgreSQL 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. Start this cluster again if you want to restore the cluster resources from the original storage by snapshots.

Stop a cluster

OpsRequest

Run the command below to stop a cluster.

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

Edit cluster YAML file

Configure replicas as 0 to delete pods.

apiVersion: apps.kubeblocks.io/v1alpha1
kind: Cluster
metadata:
    name: mycluster
    namespace: demo
spec:
  clusterDefinitionRef: pulsar
  clusterVersionRef: pulsar-3.0.2
  terminationPolicy: Delete
  componentSpecs:
  - name: pulsar
    componentDefRef: pulsar
    disableExporter: true 
    replicas: 0
    volumeClaimTemplates:
    - name: data
      spec:
        storageClassName: standard
        accessModes:
          - ReadWriteOnce
        resources:
          requests:
            storage: 20Gi

Start a cluster

OpsRequest

Run the command below 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 

Edit cluster YAML file

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

apiVersion: apps.kubeblocks.io/v1alpha1
kind: Cluster
metadata:
    name: mycluster
    namespace: demo
spec:
  clusterDefinitionRef: pulsar
  clusterVersionRef: pulsar-3.0.2
  terminationPolicy: Delete
  componentSpecs:
  - name: pulsar
    componentDefRef: pulsar
    disableExporter: true  
    replicas: 1
    volumeClaimTemplates:
    - name: data
      spec:
        storageClassName: standard
        accessModes:
          - ReadWriteOnce
        resources:
          requests:
            storage: 20Gi