Switchover
You can initiate a switchover for an ApeCloud MySQL RaftGroup cluster. Then KubeBlocks switches the instance roles.
Before you start
Make sure the cluster is running normally.
kubectl get cluster mycluster -n demo
Check whether the following role probe parameters exist to verify whether the role probe is enabled.
kubectl get cd apecloud-mysql -o yaml
>
probes:
roleProbe:
failureThreshold: 2
periodSeconds: 1
timeoutSeconds: 1
Initiate the switchover
You can switch a follower of an ApeCloud MySQL RaftGroup over to the leader role, and the former leader instance over to a follower.
The value of instanceName
decides whether a new leader instance is specified for the switchover.
Initiate a switchover with no specified leader instance.
kubectl apply -f -<<EOF
apiVersion: apps.kubeblocks.io/v1alpha1
kind: OpsRequest
metadata:
name: mycluster-switchover
namespace: demo
spec:
clusterName: mycluster
type: Switchover
switchover:
- componentName: apecloud-mysql
instanceName: '*'
EOFInitiate a switchover with a specified new leader instance.
kubectl apply -f -<<EOF
apiVersion: apps.kubeblocks.io/v1alpha1
kind: OpsRequest
metadata:
name: mycluster-switchover
namespace: demo
spec:
clusterName: mycluster
type: Switchover
switchover:
- componentName: apecloud-mysql
instanceName: 'mycluster-mysql-2'
EOF
Verify the switchover
Check the instance status to verify whether the switchover is performed successfully.
kubectl get pods -n demo
Handle an exception
If an error occurs, refer to Handle an exception to troubleshoot the operation.