Ceph Monitor Charm

[RFE] Check monitor-count against units deployed before starting mon cluster

Bug #1974445 reported by Peter De Sousa on 2022-05-20

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	Ceph Monitor Charm	Triaged	Medium	Unassigned

Bug Description

Hi,

Similar to https://bugs.launchpad.net/charm-ceph-mon/+bug/1784860, if a mon cluster of three units is deployed with the monitor-count configured to 1; each mon in that cluster will assume that is the leader and cause a three-way split-brain situation. [1]

This bug is to request a change to the logic which checks the monitor count against expected monitor count to prevent this scenario and aid the end-user in deploying the cluster successfully.

Many thanks,

Peter

[1] https://github.com/openstack/charm-ceph-mon/blob/ed7b94b135e8a2c22dcda8ad32c5a89d58259ab4/lib/charms_ceph/utils.py#L769-L795