PerconaDB Pods are Restarting Frequently due to OOMKilled Errors

Problem

Frequent PerconaDB pod restarts are observed due to OOMKilled errors. The output of the **percona-db-pxc-db-pxc** pod describe:

Pod percona-xtradb-cluster
    
 
Containers:...         pxc:    Image:         percona/percona-xtradb-cluster:8.0.39-30.1    Ports:         3306/TCP, 4444/TCP, 4567/TCP, 4568/TCP, 33062/TCP, 33060/TCP    Host Ports:    0/TCP, 0/TCP, 0/TCP, 0/TCP, 0/TCP, 0/TCP    Command:      /var/lib/mysql/pxc-entrypoint.sh    Args:      mysqld    State:          Running      Started:      Tue, 03 Jun 2025 10:58:46 +0000    Last State:     Terminated      Reason:       OOMKilled                                  Exit Code:    137                                    Started:      Tue, 03 Jun 2025 06:54:25 +0000      Finished:     Tue, 03 Jun 2025 10:58:43 +0000    Ready:          True    Restart Count:  73                                       Limits:      cpu:     2      memory:  6Gi                                         Requests:      cpu:      400m      memory:   3Gi
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Environment

Self-Hosted Private Cloud Director Virtualization - v2025.4 and Higher
Self-Hosted Private Cloud Director Kubernetes - v2025.4 and Higher

Cause

The current limit for the **percona-db-pxc-db-pxc-<0-2>** pod memory limit is insufficient for its operations.

Diagnostics

Commands used to identify the issue:

Bash
    
 
$ kubectl describe pod -n <REGION_NAMESPACE> percona-db-pxc-db-pxc-<0-2>$ kubectl events -n <REGION_NAMESPACE>
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Resolution

Increase the memory limit of the pods from the statefulset **percona-db-pxc-db-pxc**

Bash
    
 
$ kubectl edit statefulset percona-db-pxc-db-pxc-<0-2> -n <REGION_NAMESPACE> ...      resources:        limits:          cpu: "2"          memory: 8Gi    # Default value 6Gi...
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Validation

Make sure the pods are running as expected and the new memory limits are updated in the pods

Bash
    
 
$ kubectl describe pod -n <REGION_NAMESPACE> percona-db-pxc-db-pxc-<0-2>$ kubectl get pods -n <REGION_NAMESPACE>
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Additional Information

If the PerconaDB pods are down, it might impact other pods like the pf9-nginx keystone etc.

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