[Pacemaker] cman based cluster fencindevice fence_pcmk

[David Vossel]

----- Original Message -----
> From: "Wolfgang Routschka" <wolfgang.routschka at drumedar.de>
> To: pacemaker at oss.clusterlabs.org
> Sent: Thursday, April 11, 2013 9:49:10 AM
> Subject: [Pacemaker] cman based cluster fencindevice fence_pcmk
> 
> Hi all,
> one question today about cman based cluster on rhel6 and clone systems with
> fencingdeviceagent fence_pcmk
> In my scenario the stonithdevice is a IBM based IPMI-Management Interface
> (IMM) so I want to use fence_ipmilan from package resource-agents.
> after reading rhel quickstart guide
> http://clusterlabs.org/quickstart-redhat.html and cluster from Scratch 8.2.3
> Configuring CMAN Fencing
> http://clusterlabs.org/doc/en-US/Pacemaker/1.1-plugin/html/Clusters_from_Scratch/ch08s02s03.html
> I´m not sure how can I use fence_ipmilan for stonith device resource because
> in my configuration fencingdevice is fence_pcmk
> "ccs -f /etc/cluster/cluster.conf --addfencedev pcmk agent=fence_pcmk"

Take a look at the this page again. http://clusterlabs.org/doc/en-US/Pacemaker/1.1-plugin/html/Clusters_from_Scratch/ch08s02s03.html

at the top.

"We configure the fence_pcmk agent (supplied with Pacemaker) to redirect any fencing requests from CMAN components (such as dlm_controld) to Pacemaker. "

So, with your CMAN stack + pacemaker, we are configuring CMAN to call into STONITH to issue fencing requests by using fence_pcmk.  fence_pcmk is just an interface for CMAN to talk to STONITH. The actual fencing devices (like fence_ipmilan) are configured in pacemaker.

That means fencing will look like this coming from CMAN

 CMAN >>> fence_pcmk >>>> STONITH >>> fence_ipmilan

Fencing coming from pacemaker looks like this.

 pacemaker >>>> STONITH >>>> fence_ipmilan

Pacemaker can talk directly to STONITH via IPC.  CMAN needs to talk to stonith through the fence_pcmk agent.

To configure STOINTH devices in pacemaker follow this guide. If you are using a rhel 6.4 based distro I'd use the pcs management tool, http://clusterlabs.org/doc/en-US/Pacemaker/1.1-pcs/html-single/Clusters_from_Scratch/index.html#idm48909136 For crm shell use this guide, http://clusterlabs.org/doc/en-US/Pacemaker/1.1-crmsh/html-single/Clusters_from_Scratch/index.html#_example

Hope this helps
-- Vossel








> Greetings
> Wolfgang
> 
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