[Pacemaker] Using fence_sanlock with pacemaker 1.1.8-7.el6

Fri May 10 01:29:09 UTC 2013

On 10/05/2013, at 11:18 AM, John McCabe <john at johnmccabe.net> wrote:

> 
> 
> 
> On Thu, May 9, 2013 at 3:12 AM, Andrew Beekhof <andrew at beekhof.net> wrote:
> 
> On 08/05/2013, at 11:52 PM, John McCabe <john at johnmccabe.net> wrote:
> 
> > Hi,
> > I've been trying, unsuccessfully, to get fence_sanlock running as a fence device within pacemaker 1.1.8 in Centos64.
> >
> > I've set the pcmk_host_argument="host_id"
> 
> You mean the literal string "host_id" or the true value?
> Might be better to send us the actual config you're using along with log files.
> 
> Also, what does "fence_sanlock -o metadata" say? 
> 
> [root at fee ~]# fence_sanlock -o metadata
> <?xml version="1.0" ?>
> <resource-agent name="fence_sanlock" shortdesc="Fence agent for watchdog and shared storage">
> <longdesc>
> fence_sanlock is an i/o fencing agent that uses the watchdog device to
> reset nodes.  Shared storage (block or file) is used by sanlock to ensure
> that fenced nodes are reset, and to notify partitioned nodes that they
> need to be reset.
> </longdesc>
> <vendor-url>http://www.redhat.com/</vendor-url>
> <parameters>
>         <parameter name="action" unique="0" required="1">
>                 <getopt mixed="-o <action>" />
>                 <content type="string" default="off" />
>                 <shortdesc lang="en">Fencing Action</shortdesc>
>         </parameter>
>         <parameter name="path" unique="0" required="1">
>                 <getopt mixed="-p <action>" />
>                 <content type="string" />
>                 <shortdesc lang="en">Path to sanlock shared storage</shortdesc>
>         </parameter>
>         <parameter name="host_id" unique="0" required="1">
>                 <getopt mixed="-i <action>" />
>                 <content type="string" />
>                 <shortdesc lang="en">Host id for sanlock (1-128)</shortdesc>
>         </parameter>
> </parameters>
> <actions>
>         <action name="on" />
>         <action name="off" />
>         <action name="status" />
>         <action name="metadata" />
>         <action name="sanlock_init" />
> </actions>
> </resource-agent>
>  
> 
> I'd set the pcmk_host_argument to the literal string since the errors thrown complain that the host_id param is missing and I'd assumed that the with the pcmk_host_map also set we'd end up passing the mapped id rather than the hostname (attached an archive with /var/log/messages covering when the stonith device is added with pcs):
> 
> 
>   May 10 01:33:42 fee stonith-ng[10542]:  warning: log_operation: st-sanlock:10725 [ host_id argument required ]
> 
>   pcs -f stonith_cfg_sanlock stonith create st-sanlock fence_sanlock path="/dev/mapper/vg_shared-lv_sanlock" pcmk_host_list="fee-1 fi-1" pcmk_host_map="fee-1:1;fi-1:2" pcmk_host_argument="host_id"
> 
> 
> Taking a closer look at the fence_sanlock script itself (from fence-sanlock-2.6-2.el6.x86_64) and it doesn't appear to support a monitor operation, which led me to suspect that it didn't actually support being used with pacemaker, at least without possibly having to update the agent script.

Correct

> Setting pcmk_monitor_action="status" didn't help either as it still fails requesting the host_id be set.

Also correct, since we're testing the agent itself, not a specific host_id.

> 
> I ended up getting sbd up and running as an interim solution - but I'd really like to be able to stick with a fencing agent thats got a future in RHEL where possible. Is the expectation/intention that all fencing agents be compatible with pacemaker?

Yes.  There are a couple of ways in which this agent is not conforming to Red Hat's API, could you file a bug against it and CC me please?

> 
> > along with pcmk_host_map, pcmk_host_list and path.
> >
> > But it later complains that its unable to process the monitor operation since no host_id is provided.. I'd have assumed that the pcmk_host_argument would have performed a mapping, but it seems not to in the case of the monitor operation. When pcs stonith list returned fence_sanlock in its list of agents I'd hoped it was going to be straightforward.
> >
> > Is fence_sanlock actually compatible with pacemaker, and has anyone had success using it with pacemaker rather than just directly within CMAN?
> >
> > Yours confused,
> > John
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> >
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> 
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