Restart PostgreSQL cluster

You can restart all pods of the cluster. When an exception occurs in a database, you can try to restart it.

NOTE

The pod role may change after the cluster restarts.

Steps

Restart a cluster.

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

Check the pod and operation status to validate the restarting.

kubectl get pod -n demo
>
NAME                     READY   STATUS            RESTARTS   AGE
mycluster-postgresql-0   3/4     Terminating       0          5m32s
mycluster-postgresql-1   4/4     Running           0          6m36s

kubectl get ops ops-restart -n demo
>
NAME          TYPE      CLUSTER     STATUS    PROGRESS   AGE
ops-restart   Restart   mycluster   Succeed   1/1        3m26s

During the restarting process, there are two status types for pods.

STATUS=Terminating: it means the cluster restart is in progress.
STATUS=Running: it means the cluster has been restarted.

Configure the values of components and ttlSecondsAfterSucceed and run the command below to restart a specified cluster.
```
kbcli cluster restart mycluster -n demo --components="postgresql" --ttlSecondsAfterSucceed=30
```
- components describes the component name that needs to be restarted.
- ttlSecondsAfterSucceed describes the time to live of an OpsRequest job after the restarting succeeds.

Validate the restarting.

Run the command below to check the cluster status to check the restarting status.

kbcli cluster list mycluster -n demo
>
NAME       NAMESPACE   CLUSTER-DEFINITION          VERSION             TERMINATION-POLICY   STATUS    CREATED-TIME
mycluster   demo       postgresql                  postgresql-14.8.0   Delete               Running   Sep 28,2024 16:57 UTC+0800

STATUS=Updating: it means the cluster restart is in progress.
STATUS=Running: it means the cluster has been restarted.