[Pacemaker] Question to fencing/stonithing

[Andreas Mock]

Hi Leon,

thank you for the pointer to the manuals. I read it already.

My 2-node-cluster seems not to fence the other node
at startup. And I do not have an explanation. That's the reason
I asked (after reading the docs).

- CMAN_QUORUM_TIMEOUT=0
As the inline doc says:
# CMAN_QUORUM_TIMEOUT -- amount of time to wait for a quorate cluster on
#     startup quorum is needed by many other applications, so we may as
#     well wait here.  If CMAN_QUORUM_TIMEOUT is zero, quorum will
#     be ignored.

=> quorum is ignored => fence-domain is created and enabled with the first
node
joining (isn't it?).

- as man fenced says:
When the fence domain is first created in the cluster (by the first node to
join it)
and subsequently enabled (by the cluster gaining quorum)  any
nodes  listed  in cluster.conf that are not presently members of the
corosync cluster are fenced.

- so, does quorum ignore mean: You don't have quorum but
it doesn't matter or does it mean the first node does get quorum
even it's the one an only node. 

So, my questions more precise:
Why does a startup-fencing not happen in my 2-node-cluster?
Is there a way to get this behaviour?

Best regards
Andreas Mock

-----Ursprüngliche Nachricht-----
Von: Leon Fauster [mailto:leonfauster at googlemail.com] 
Gesendet: Montag, 1. Juli 2013 19:45
An: The Pacemaker cluster resource manager
Betreff: Re: [Pacemaker] Question to fencing/stonithing

Am 01.07.2013 um 14:28 schrieb Andreas Mock <andreas.mock at web.de>:
> Hi all,
> 
> just want to get clear about startup fencing.
> 
> Scenario: RHEL 6.4, cman, 2-node-cluster, pacemaker, fence via 
> pcmk-redirect. pacemaker stonith enabled, no-quorum-policy=ignore, 
> CMAN_QUORUM_TIMEOUT=0
> 
> 
> When should a startup fencing operation occure?
> I thought a freshly starting node not seeing the other members in a 
> timeout interval will try to stonith the other node to get sure that 
> this one doesn't run resources. Is this true?
> Where is the config variable for that timeout?
> 
> Can someone put light on that, please?



/etc/sysconfig/cman

man fenced

--
LF

 

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