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doc: added note about monitor ips update during failover
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>
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@ -178,3 +178,10 @@ operation from the primary cluster to a remote cluster. The existing volumes
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that are created on the remote cluster does not require any mapping as the
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volumeHandle already contains the required information about the local cluster (
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clusterID, poolID etc).
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**Note:-** To use a mirrored and promoted RBD image on a secondary site during a
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failover, you need to replace the primary monitor addresses with the IP
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addresses of the secondary cluster in the ceph-csi-config. Otherwise, Ceph-CSI
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won't be able to use the volumes, and application pods will become stuck in the
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`ContainerCreating` state. Thus, during failover, both clusters will have the
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same monitor IP addresses.
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