[ClusterLabs] fence agent and using it with pacemaker

[Stanislav Kopp]

HI Dejan,

2016-02-10 20:28 GMT+01:00 Dejan Muhamedagic <dejanmm at fastmail.fm>:
> Hi,
>
> On Wed, Feb 10, 2016 at 03:20:49PM +0100, Stanislav Kopp wrote:
>> Hi all,
>>
>> I have general, clarification question about how fence agents work
>> with pacemaker (crmsh in particular). As far I understood STDIN
>
> Not sure what crmsh has to do with fencing agents. The
> interaction happens between other pacemaker components (normally
> stonithd) and the agent.

I've mentioned crm, to make sure it's not some stupid syntax error by
me with stonith definition.

>> arguments can be used within pacemaker resources and command line
>> arguments in terminal (for testing and scripting?).
>
> As for testing, crmsh has support for resource testing with
> 'configure rsctest', but apparently only Linux HA stonith agents
> (legacy*) are currently supported.
>
> Otherwise, there's stonith_admin(8) and stonith(8) for stonith
> agents. The former uses stonith-ng (stonithd) which makes it
> closer to the real cluster operation.
>
> There is also a (not so well known) stonith interface to fencing
> agents, which predates RH fencing agents support in pacemaker.
> One just needs to create a link in /usr/lib64/stonith/plugins/rhcs:

That sounds interesting, because the agent (fence_pve) comes with
"fence-agents" package, and not with "cluster-glue" (in Debian), Do
you know, what is difference between agents in /usr/sbin/ (like
"/usr/sbin/fence_ilo") and in "/usr/lib/stonith/plugins/external/"?

Thanks,
Stan

> lrwxrwxrwx 1 root root 32 Nov 18 07:56 fence_cisco_ucs -> ../../../../sbin/fence_cisco_ucs
>
> For instance, this agent is referenced as stonith:rhcs/cisco_ucs.
>
> Finally, it would be great to somehow put together the two
> fencing/stonith agents sets.
>
> Thanks,
>
> Dejan
>
> *) Why the Linux HA stonith agents got the attribute/name
> "legacy" in Pacemaker at some point is beyond me.
>
>> I have "fence_pve" [1] agent which works fine with command line
>> arguments, but not with pacemaker, it says some parameters like
>> "passwd" or "login" does not exist, although STDIN parameters are
>> supported [2]
>>
>> I'm using  stock 1.1.7-1 on Debian Wheezy
>>
>> Best,
>> Stan
>>
>>
>> [1] https://github.com/ClusterLabs/fence-agents/blob/master/fence/agents/pve/fence_pve.py
>> [2] https://www.mankier.com/8/fence_pve#Stdin_Parameters
>>
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