OCPBUGS-114888: Updated exactly three control plane nodes must be to m…

[dfitzmau]

Version(s):
4.17+

Issue:
OCPBUGS-114888

Link to docs preview:

• https://119021--ocpdocs-pr.netlify.app/openshift-dedicated/latest/architecture/control-plane.html
• https://119021--ocpdocs-pr.netlify.app/openshift-enterprise/latest/architecture/control-plane.html
• https://119021--ocpdocs-pr.netlify.app/openshift-rosa/latest/architecture/control-plane.html

• Reporter has approved this change (Akanksha Gawai).
• SME has approved this change (Haseeb Tariq).
• QE has approved this change (Sandeep Kundu).

#81631

[openshift-ci-robot]

@dfitzmau: This pull request references Jira Issue OCPBUGS-114888, which is invalid:

• expected the bug to target the "5.1.0" version, but no target version was set
• expected the bug to be in one of the following states: NEW, ASSIGNED, POST, but it is MODIFIED instead

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.

Details

In response to this:

Version(s):

Issue:
OSDOCS-20272

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.

[openshift-ci-robot]

@dfitzmau: This pull request references Jira Issue OCPBUGS-114888, which is invalid:

• expected the bug to target the "5.1.0" 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.

Details

In response to this:

Version(s):
4.17+

Issue:
OSDOCS-20272

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]

🤖 Mon Aug 31 09:47:39 - Prow CI generated the docs preview:

https://119021--ocpdocs-pr.netlify.app/openshift-dedicated/latest/architecture/control-plane.html
https://119021--ocpdocs-pr.netlify.app/openshift-enterprise/latest/architecture/control-plane.html
https://119021--ocpdocs-pr.netlify.app/openshift-rosa/latest/architecture/control-plane.html

[openshift-ci]

@dfitzmau: all tests passed!

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[agawai]

LGTM

[sandeepknd]

/lgtm

[hasbro17]

The etcd cluster size must be odd. Even cluster sizes like 4 have a worse fault tolerance than 3 since more nodes can fail to get us to quorum loss.
https://etcd.io/docs/v3.7/faq/#why-an-odd-number-of-cluster-members

So we should only recommend odd sizes: 3 and 5.