From 34eac41997ba54860a868f14f7704e73a78b7612 Mon Sep 17 00:00:00 2001 From: Kamil Madac Date: Fri, 15 Mar 2024 14:14:47 +0100 Subject: [PATCH] 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 --- docs/design/proposals/clusterid-mapping.md | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/docs/design/proposals/clusterid-mapping.md b/docs/design/proposals/clusterid-mapping.md index 9e72205f3..b4c3ebdbd 100644 --- a/docs/design/proposals/clusterid-mapping.md +++ b/docs/design/proposals/clusterid-mapping.md @@ -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.