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doc: added note about monitor ips update during failover

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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 <kamil.madac@gmail.com>
This commit is contained in:
Kamil Madac 2024-03-15 14:14:47 +01:00
parent c32dfc0ae6
commit 34eac41997
1 changed files with 7 additions and 0 deletions
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7
docs/design/proposals/clusterid-mapping.md
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@ -178,3 +178,10 @@ operation from the primary cluster to a remote cluster. The existing volumes
that are created on the remote cluster does not require any mapping as the
volumeHandle already contains the required information about the local cluster (
clusterID, poolID etc).
**Note:-** To use a mirrored and promoted RBD image on a secondary site during a
failover, you need to replace the primary monitor addresses with the IP
addresses of the secondary cluster in the ceph-csi-config. Otherwise, Ceph-CSI
won't be able to use the volumes, and application pods will become stuck in the
`ContainerCreating` state. Thus, during failover, both clusters will have the
same monitor IP addresses.