This isn't how fencing works. If a node enters an unknown state (stops
responding to the other node(s)), it must be put into a known state.
This mechanism must work without any input from the target node. If you
try to do "resource level" fencing, you are assuming that the node can
respond.
So the only two options you have are "power fencing" and "fabric
fencing". The first forcibly powers off the node and the later severs
the node's connection to the network. In either case, the node is taken
offline.
Anything that leaves a node up and accessible, to any degree, is not a
useful fence mechanism.
digimer
On 17/07/13 04:24, K Mehta wrote:
Thanks Digimer. I will make sure that I configure fencing along with CMAN.
I have multiple independent master slave resources in the cluster.
A node could be master for few and slave for other resources.
I need to make sure that fencing occurs at resource level
(no klling of nodes) rather than at node level.I hope it is ok to embed
logic of selective blocking of resources in fencing agent.
On Wed, Jul 17, 2013 at 9:15 AM, Digimer <li...@alteeve.ca
<mailto:li...@alteeve.ca>> wrote:
On 16/07/13 09:03, K Mehta wrote:
I have a two node test cluster running with CMAN plugin. Fencing
is not
configured.
Andrew spoke to the pacemaker stuff. I want to reiterate what he
said on fencing though. Fencing *must* be used with cman. If fenced
calls a fence, nothing else will happen until the fence succeeds.
This is by design to avoid split-brains.
If you need help configuring stonith in pacemaker or using the
fence_pcmk fence agent hook in cluster.conf, please ask.
--
Digimer
Papers and Projects: https://alteeve.ca/w/
What if the cure for cancer is trapped in the mind of a person
without access to education?
--
Digimer
Papers and Projects: https://alteeve.ca/w/
What if the cure for cancer is trapped in the mind of a person without
access to education?
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