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doc: added note about monitor ips update during failover #4501

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@kmadac kmadac commented Mar 15, 2024

Docs update: IP addresses in csi-config-map needs to be changed after failover to secondary site. Without this change, applications can't use mirrored rbd images.

Is there anything that requires special attention

Only documentation update.

Related issues

Fixes: #4493

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    updated with breaking and/or notable changes for the next major release.
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IP addresses in csi-config-map needs to be changed after failover
to secondary site. Without this change, applications can't use
mirrored rbd images.

Signed-off-by: Kamil Madac <[email protected]>
@mergify mergify bot added ci/skip/e2e skip running e2e CI jobs ci/skip/multi-arch-build skip building on multiple architectures component/docs Issues and PRs related to documentation labels Mar 15, 2024
@Rakshith-R
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hey @kmadac

The document talks about having a new cluster-mapping.json to provide cephcsi with the required information to map IDs from one cluster to another.

The config.json section does not need to be modified in either cluster.
The configmap's config.json in each k8s cluster can have different config.json entries (mon ips, cluster IDs etc).

Just adding cluster-mapping.json info to each of these k8s cluster's cephcsi configmap is sufficient. The existing cephcsi configmap's config.json does not need to be modified.

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This pull request has been automatically marked as stale because it has not had recent activity. It will be closed in two weeks if no further activity occurs. Thank you for your contributions.

@github-actions github-actions bot added the stale label Apr 17, 2024
@kmadac
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kmadac commented Apr 18, 2024

Sorry @Rakshith-R , I'm not sure I understand your comment. In the issue #4493 we found out that in order to successfully use volumes on secondary site during the failover period, it is necessary to set monitor ip addresses of primary cluster in config.json to secondary monitor ip addresses on secondary k8s cluster. Otherwise we see FailedMount errors in pods which tries to use those volumes.

Check please this comment in the issue: #4493 (comment)

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Cluster-mapping during failover not applied
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