[ClusterLabs] fence agent and using it with pacemaker

[Stanislav Kopp]

HI again,

I think I've sorted it out, correct me if I'm wrong.

- "fence-agents" are RHCS compatible fence agents (for using with
RGmanager originally?) located in /usr/sbin/fence_*,

- "cluster-glue" provides agents compatible with pacemaker, they re
located in "/usr/lib/stonith/plugins/"

"fence_pve" [1] agent looks like RHCS agent, so it doesn't work
out-of-box with pacemaker, but like Dejan hints, it's possible to use
rhcs "adapter" to use RH fencing agent in pacemaker. Unfortunally I
don't have

/usr/lib{,64}/stonith/plugins/rhcs directory in Debian (only rhcs.so
lib), can't find it via "yum provides" in Centos 7 either.

Is there some documentation how to use RHCS fence agent with pacemaker
esp. with crmsh examples?


Best,
Stan

[1] https://github.com/ClusterLabs/fence-agents/blob/master/fence/agents/pve/fence_pve.py

2016-02-11 12:07 GMT+01:00 Stanislav Kopp <staskopp at gmail.com>:
> 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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