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Chapter 4. Known issues

This section describes known issues in OpenShift sandboxed containers 1.7.

4.1. Sandboxed containers
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OpenShift sandboxed containers 1.7.0 does not work with OpenShift Container Platform 4.14 and older versions

You must upgrade to OpenShift Container Platform 4.15 or later before installing or upgrading the OpenShift sandboxed containers Operator. For more information, see OpenShift sandboxed containers operator 1.7 is not available and Upgrade to OSC 1.7.0 put running Peer Pods into ContainerCreating status in the KnowledgeBase.

Jira:KATA-3193, Jira:KATA-3155

4.2. Performance and scaling
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Increasing container CPU resource limits fails if CPUs are offline

Using container CPU resource limits to increase the number of available CPUs for a pod fails if the requested CPUs are offline. If the functionality is available, you can diagnose CPU resource issues by running the oc rsh <pod> command to access a pod and then running the lscpu command: 

$ lscpu
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Example output: 

CPU(s):                                16
On-line CPU(s) list:             0-12,14,15
Off-line CPU(s) list:            13
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The list of offline CPUs is unpredictable and can change from run to run.

Workaround: Use a pod annotation to request additional CPUs, as in the following example: 

metadata:
  annotations:
    io.katacontainers.config.hypervisor.default_vcpus: "16"
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Jira:KATA-1376

Increasing the sizeLimit does not expand an ephemeral volume

You cannot use the sizeLimit parameter in the pod specification to expand ephemeral volumes because the volume size default is 50% of the memory assigned to the sandboxed container.

Workaround: Change the size by remounting the volume. For example, if the memory assigned to the sandboxed container is 6 GB and the ephemeral volume is mounted at /var/lib/containers, you can increase the size of this volume beyond the 3 GB default by running the following command: 

$ mount -o remount,size=4G /var/lib/containers
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Jira:KATA-2579

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