[occm] Multi region support information

[sebastienmusso]

Is this a BUG REPORT or FEATURE REQUEST?:

/kind feature

What happened:
We are currently testing kubernetes deployment on several openstack clusters.
We deployed one occm by openstack and enabled OS_CCM_REGIONAL.
OCCM is mostly used for cloud-node and cloud-node-lifecycle services

What you expected to happen:
All seems to work as expected, az1 occm delete node with az1 prefix in providerID field as expected.
Node are added to the cluster with the right provider ID

Anything else we need to know?:
What is missing in order to consider this feature as GA ?
is this testing case ?
How could we help for this suject

Environment:

• openstack-cloud-controller-manager version: v1.29.0
• OpenStack version: Queen (17.6.0)
• Others: kubernetes 1.26.10 / 1.27.8

[dulek]

What makes you think this is not a supported thing? Anyway if you want to contribute to this feature, we certainly don't have a CI job testing it, so that sounds like a fair first step.

[sebastienmusso]

@dulek
the "alpha" in occm doc
make me think that

[dulek]

@dulek the "alpha" in occm doc make me think that

Ah, here it is! Well, looks like nobody looked at this for 2 years, it should be out of alpha by this time, though I'm not sure how many installations do that and how production-proven it is.

My idea to move forward would probably be to ask about the feature on the #provider-openstack on the K8s Slack. As a next step let's also make it a general option and not just a hacky env var. Then I guess we can assume that we'll try fixing issues as we go. And obviously my CI remark still stays.

[sebastienmusso]

Happy to ear that @dulek

let me look at the CI process and maybe submit a pr (with doc up to date)