[ClusterLabs] Two node cluster without fencing and no split brain?
hunter86_bg at yahoo.com
Wed Jul 21 00:28:30 EDT 2021
consider using a 3rd system as a Q disk. Also, you can use iscsi from that node as a SBD device, so you will have proper fencing .If you don't have a hardware watchdog device, you can use softdog kernel module for that.
Best Regards,Strahil Nikolov
On Wed, Jul 21, 2021 at 1:45, Digimer<lists at alteeve.ca> wrote: 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).
Papers and Projects: https://alteeve.com/w/
"I am, somehow, less interested in the weight and convolutions of
Einstein’s brain than in the near certainty that people of equal talent
have lived and died in cotton fields and sweatshops." - Stephen Jay Gould
Manage your subscription:
ClusterLabs home: https://www.clusterlabs.org/
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Users