Description:
We are running OpenShift Container Platform 4.17 and have deployed the certified CrunchyData PostgreSQL Operator (PGO) version 5.8.2 from the OperatorHub.

After configuring a PostgresCluster custom resource, we observe repeated restarts of the instance and repo pods with the following event:

11s Warning Evicted Pod/pgo-cluster-instance1-8wqf-0 Usage of EmptyDir volume "tmp" exceeds the limit "16Mi".
10s Warning Evicted Pod/pgo-cluster-instance1-pw46-0 Usage of EmptyDir volume "tmp" exceeds the limit "16Mi".
7s Warning Evicted Pod/pgo-cluster-instance1-h597-0 Usage of EmptyDir volume "tmp" exceeds the limit "16Mi".

EXPECTED

This suggests that the emptyDir volume used for /tmp has a sizeLimit of only 16Mi, which is too small under normal operational load—especially during pgBackRest operations.

We would like to increase the emptyDir size limit for the /tmp volume used in the repo and instance pods. However, we do not find any configuration option in the CR (PostgresCluster) to control this size.

Is there a supported way to override or increase the emptyDir sizeLimit (e.g., to 512Mi)?
If not currently supported, can this be added as a configurable field in the CRD?
Is there a workaround we can use safely (e.g., patching StatefulSet or customizing templates)?

pgo-cluster-instance1-8wqf-0.log
pgo-cluster-repo-host-0.log

Environment

Please provide the following details:

• Platform: (Kubernetes, OpenShift, Rancher, GKE, EKS, AKS etc.)
• Platform Version: (e.g. 1.20.3, 4.7.0)
• PGO Image Tag: (e.g. ubi8-5.x.y-0)
• Postgres Version (e.g. 15)
• Storage: (e.g. hostpath, nfs, or the name of your storage class)

Provide steps to get to the error condition:

[root@vmlcasocppmd001 logs]# oc get pod
NAME READY STATUS RESTARTS AGE
pgo-cluster-instance1-8wqf-0 0/4 Init:0/2 0 1s
pgo-cluster-instance1-h597-0 3/4 Running 0 7s
pgo-cluster-instance1-pw46-0 0/4 Init:1/2 0 4s
pgo-cluster-repo-host-0 0/2 Init:0/2 0 6s

Logs

pod logs attached

Additional Information

Please provide any additional information that may be helpful.