[ClusterLabs] Two node cluster without fencing and no split brain?
lists at alteeve.ca
Tue Jul 20 18:45:23 EDT 2021
On 2021-07-20 6:04 p.m., john tillman wrote:
> Is it possible to configure a two node cluster (pacemaker 2.0) without
> fencing and avoid split brain?
> I was hoping there was a way to use a 3rd node's ip address, like from a
> network switch, as a tie breaker to provide quorum. A simple successful
> ping would do it.
Quorum is a different concept and doesn't remove the need for fencing.
> I realize that this 'ping' approach is not the bullet proof solution that
> fencing would provide. However, it may be an improvement over two nodes
It would be, at best, a false sense of security.
> Is there a configuration like that already? Any other ideas?
> Pointers to useful documents/discussions on avoiding split brain with two
> node clusters would be welcome.
(note: currently throwing a cert error related to the let's encrypt
issue, should be cleared up soon).
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