[Pacemaker] How should I configure the STONITH?

[Andreas Kurz]

Hello,

On 12/21/2011 03:34 AM, Qiu Zhigang wrote:
> Hi
> 
> 
>> -----Original Message-----
>> From: Andreas Kurz [mailto:andreas at hastexo.com]
>> Sent: Wednesday, December 21, 2011 6:53 AM
>> To: pacemaker at oss.clusterlabs.org
>> Subject: Re: [Pacemaker] How should I configure the STONITH?
>>
>> Hello,
>>
>> On 12/20/2011 05:01 AM, Qiu Zhigang wrote:
>>> Hi,
>>>
>>>> -----Original Message-----
>>>> From: Andreas Kurz [mailto:andreas at hastexo.com]
>>>> Sent: Monday, December 19, 2011 6:50 PM
>>>> To: pacemaker at oss.clusterlabs.org
>>>> Subject: Re: [Pacemaker] How should I configure the STONITH?
>>>>
>>>> Hello,
>>>>
>>>> On 12/19/2011 08:31 AM, Qiu Zhigang wrote:
>>>>> Hi all,
>>>>>
>>>>> I want to configure the STONITH, but I couldn't find the following
>>>>> CLI described in the reference material (like
>>>>> Pacemaker-1.1-Pacemaker_Explained-en-US.pdf).
>>>>>
>>>>> stonith -L
>>>>> stonith -t ibmhmc -n
>>>>> stonith -t apcmaster -h
>>>>>
>>>>> I only found the stonith_admin command, but when I execute this cli,
>>>>> some problem occurred.
>>>>>
>>>>> [root at h10_151 ~]# stonith_admin  -L
>>>>> stonith_admin[14402]: 2011/12/19_15:29:20 info: crm_log_init_worker:
>>>>> Changed active directory to /var/lib/heartbeat/cores/root
>>>>> stonith_admin[14402]: 2011/12/19_15:29:20 notice: log_data_element:
>>>>> st_callback: st_notify_disconnect <notify t="st_notify"
>>>>> subt="st_notify_disconnect" />
>>>>>
>>>>> What's the reason of this problem ?
>>>>>
>>>>> Moreover I didn't find the stonith plugins, which rpm package
>>>>> contain the stonith plugins ? I use the redhat 6, pacemaker version
>>>>> is pacemaker-1.1.2-7.el6.x86_64.rpm.
>>>>
>>>> RHEL6 and derivates ship "fence-agents" package known from it's
>>>> redaht-cluster and not the stonith agents ... the agents are all
>>>> named "fence_*' and come with nice man-pages.
>>>>
>>>> You can use them (nearly) like the stonith agents that used to come
>>>> with Pacemaker as prerequisite.
>>>
>>> Thank you, but I'm doubt the way of configure fence-agents in pacemaker.
>>> Could I configure like following? If this isn't right, please point me
>>> the right way, thank you.
>>>
>>> configure
>>> primitive st-apc stonith: fence_apc \
>>> params ip="xx.xx.xx.xx" username="admin" password="password"
>>> clone fencing st-apc
>>> commit
>>
>> try something like this for the primitive:
>>
>> primitive st-apc stonith:fence_apc \
>> 	params ipaddr="xx.xx.xx.xx" login="admin" passwd="password" \
>> 	action="reboot" port="dummy" pcmk_host_list="node1 node2" \
>> 	pcmk_host_map="node1:1,node2:2" pcmk_host_check="static-list"
>>
>> "man stonithd" and "man fence_apc" should also be helpful
>>
> Thank you, I'll try.
> 
>>>
>>> Another question is about Quorum device, which component is the quorum
>>> device in pacemaker, like qdisk in CMAN, is SBD?
>>
>> corosync or heatbeat CCM do this job for Pacemaker ... deliver node
> availability
>> information so Pacemaker can calculate quorum based on node count.
>>
> But how to process the split-brain with 2-nodes ? In cman we could use qdisk
> to 
> arbitrate the quorum node, what about the corosync+pacemaker?

You have to configure stonith and ignore quorum ... if you really run
into a split-brain, one node will be faster in fencing the other node
... see http://ourobengr.com/ha for some hints to not run into a reboot
cycle.

You could use redundant rings for corosync communication to lower risk
of split-brain and/or add e.g. an extra "quorum" node.

Regards,
Andreas

-- 
Need help with Pacemaker?
http://www.hastexo.com/now

> 
>> Regards,
>> Andreas
>>
>> --
>> Need help with Pacemaker?
>> http://www.hastexo.com/now
>>
>>>
>>>
>>> Best Regards,
>>> Qiu Zhigang
>>>>
>>>> Regards,
>>>> Andreas
>>>>
>>>> --
>>>> Need help with Pacemaker?
>>>> http://www.hastexo.com/now
>>>>
>>>>>
>>>>>
>>>>> Best Regards,
>>>>>
>>>>>
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>>>>>
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>>>>> Bugs: http://bugs.clusterlabs.org
>>>>
>>>>
>>>
>>>
>>>
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>>
> 
> 
> 
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