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Percona Operators Documentation

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Initial troubleshooting

Percona Operator for MySQL uses Custom Resources to manage options for the various components of the cluster.

  • PerconaServerMySQL Custom Resource with Percona Server for MySQL cluster options (it has handy ps shortname also),

  • PerconaServerMySQLBackup and PerconaServerMySQLRestore Custom Resources contain options for Percona XtraBackup used to backup Percona Server for MySQL and to restore it from backups (ps-backup and ps-restore shortnames are available for them).

The first thing you can check for the Custom Resource is to query it with kubectl get command:

$ kubectl get ps
Expected output 
NAME       REPLICATION         ENDPOINT                   STATE   MYSQL   ORCHESTRATOR   HAPROXY   ROUTER   AGE
cluster1   group-replication   cluster1-haproxy.default   ready   3                                3        20m

The Custom Resource should have ready state.

Note

You can check which Percona’s Custom Resources are present and get some information about them as follows:

$ kubectl api-resources | grep -i percona
Expected output 
perconaservermysqlbackups         ps-backup,ps-backups   ps.percona.com/v1alpha1                true         PerconaServerMySQLBackup
perconaservermysqlrestores        ps-restore             ps.percona.com/v1alpha1                true         PerconaServerMySQLRestore
perconaservermysqls               ps                     ps.percona.com/v1alpha1                true         PerconaServerMySQL

Check the Pods

If Custom Resource is not getting ready state, it makes sense to check individual Pods. You can do it as follows:

$ kubectl get pods
Expected output

The above command provides the following insights:

  • READY indicates how many containers in the Pod are ready to serve the traffic. In the above example, cluster1-haproxy-0 container has all two containers ready (2/2). For an application to work properly, all containers of the Pod should be ready.
  • STATUS indicates the current status of the Pod. The Pod should be in a Running state to confirm that the application is working as expected. You can find out other possible states in the official Kubernetes documentation .
  • RESTARTS indicates how many times containers of Pod were restarted. This is impacted by the Container Restart Policy . In an ideal world, the restart count would be zero, meaning no issues from the beginning. If the restart count exceeds zero, it may be reasonable to check why it happens.
  • AGE: Indicates how long the Pod is running. Any abnormality in this value needs to be checked.

You can find more details about a specific Pod using the kubectl describe pods <pod-name> command.

$ kubectl describe pods cluster1-mysql-0
Expected output 
...
Name:         cluster1-mysql-0
Namespace:    default
...
Controlled By:  StatefulSet/cluster1-mysql
Init Containers:
 mysql-init:
...
Containers:
 mysql:
...
   Restart Count:  0
   Limits:
     memory:  2G
   Requests:
     memory:   2G
   Liveness:   exec [/opt/percona/healthcheck liveness] delay=15s timeout=30s period=10s #success=1 #failure=3
   Readiness:  exec [/opt/percona/healthcheck readiness] delay=30s timeout=3s period=5s #success=1 #failure=3
   Startup:    exec [/opt/percona/bootstrap] delay=15s timeout=300s period=10s #success=1 #failure=1
   Environment:
...
   Mounts:
...
Volumes:
...
Events:                      <none>

This gives a lot of information about containers, resources, container status and also events. So, describe output should be checked to see any abnormalities.

Last update: 2025-06-13