GH#34497: [OKD] RHCOS image download link instead of FCOS image link

[mburke5678]

#34497

Direct internal-only preview: http://file.rdu.redhat.com/mburke/okd-issue-34497/installing/installing_rhv/installing-rhv-user-infra.html#installation-rhv-specifying-rhcos-image-settings_installing-rhv-user-infra

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[mburke5678]

@binnes PTAL

[vrutkovs]

LGTM, but in 4.8 I think the procedure is a bit different - URLs are now encoded in installer. See https://github.com/openshift/installer/blob/master/docs/user/overview.md#coreos-bootimages

[mburke5678]

@vrutkovs In your comment, are you suggesting this procedure is no longer necessary starting in 4.8? The OKD installer will pull down the correct images?

[vrutkovs]

Yeah, I think so. OKD installer can both pull images (for IPI) and print the expected artifact URL (for UPI).

I think its best be confirmed with installer / CoreOS team (@cgwalters might want to take a look)

[cgwalters]

Yep, the same procedure now works for both OCP/RHCOS and OKD/FCOS - it's the same metadata JSON format.

[mburke5678]

@cgwalters @vrutkovs What is the effect of Colin's comment to the end user?

[vrutkovs]

Users now have a more convenient access to the RHCOS artifact location straight from installer, making their UPI installs closer to what IPI creates.

[mburke5678]

/cherrypick enterprise-4.9

[openshift-cherrypick-robot]

@mburke5678: new pull request created: #37489

In response to this:

/cherrypick enterprise-4.9

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