OCPBUGS#38977: Added a limitation for disabling IPv6 OVNK

[dfitzmau]

Version(s):
4.14+

Issue:
OCPBUGS-38977

Link to docs preview:

• OCP Core
• ROSA
• Dedicated
• MicroShift

• SME has approved this change.
• QE has approved this change.

[openshift-ci-robot]

@dfitzmau: This pull request references Jira Issue OCPBUGS-38977, which is invalid:

• expected the bug to target the "4.20.0" version, but no target version was set

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

In response to this:

Version(s):
4.14+

Issue:
OCPBUGS-38977

Link to docs preview:

• SME has approved this change.
• QE has approved this change.

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[openshift-ci-robot]

@dfitzmau: No Jira issue is referenced in the title of this pull request.
To reference a jira issue, add 'XYZ-NNN:' to the title of this pull request and request another refresh with /jira refresh.

In response to this:

Version(s):
4.14+

Issue:
OCPBUGS-38977

Link to docs preview:

• SME has approved this change.
• QE has approved this change.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

[ocpdocs-previewbot]

🤖 Fri Jul 11 16:09:50 - Prow CI generated the docs preview:

https://96014--ocpdocs-pr.netlify.app/microshift/latest/microshift_configuring/microshift-nw-ipv6-config.html
https://96014--ocpdocs-pr.netlify.app/openshift-dedicated/latest/networking/ovn_kubernetes_network_provider/about-ovn-kubernetes.html
https://96014--ocpdocs-pr.netlify.app/openshift-enterprise/latest/networking/ovn_kubernetes_network_provider/about-ovn-kubernetes.html
https://96014--ocpdocs-pr.netlify.app/openshift-rosa/latest/networking/ovn_kubernetes_network_provider/about-ovn-kubernetes.html

[openshift-ci]

@dfitzmau: all tests passed!

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[cybertron]

/lgtm

[rbbratta]

/lgtm

[snarayan-redhat]

Looks good. Just one suggestion.

[snarayan-redhat]

Just a suggestion.
I feel there's some scope to simplify this sentence where we don't have to mention about ipv6.disable twice. Since we are calling it out as a limitation, we can avoid being prescriptive about the not setting the parameter.

Suggested change

* If you set `ipv6.disable=1` for the `kernelArgument` parameter in the `MachineConfig` custom resource (CR) for your cluster, OVN-Kubernetes pods enter a `CrashLoopBackOff` state. Additionally, updating your cluster to a later version of {product-title} fails because the Network Operator is stuck on a `Degraded` state. Red{nbsp}Hat does not support disabling IPv6 adddresses for your cluster so do not set `ipv6.disable=1` for the `kernelArgument` parameter.

* If you set `ipv6.disable` to `1` for the `kernelArgument` parameter in the `MachineConfig` custom resource (CR) for your cluster, OVN-Kubernetes pods enter a `CrashLoopBackOff` state. Additionally, updating your cluster to a later version of {product-title} fails because the Network Operator is stuck on a `Degraded` state. Red{nbsp}Hat does not support disabling IPv6 adddresses for your cluster so do not set `ipv6.disable=1` for the `kernelArgument` parameter.