[Pacemaker] configuration of stonith

[Digimer]

On 08/12/13 07:54, Masopust, Christian wrote:
>  
> 
>> -----Ursprüngliche Nachricht-----
>> Von: Digimer [mailto:lists at alteeve.ca] 
>> Gesendet: Freitag, 06. Dezember 2013 17:20
>> An: ms at sys4.de; The Pacemaker cluster resource manager
>> Betreff: Re: [Pacemaker] configuration of stonith
>>
>>
>> If you're using 1.1.10+,
>>
>> pcs stonith create fence_pcmk1_ipmi fence_ipmilan \
>>     pcmk_host_list="pcmk-1" ipaddr="pcmk-1.ipmi" \
>>     action="reboot" login="admin" passwd="secret" delay=15 \
>>     op monitor interval=60s
>>
>> pcs stonith create fence_pcmk2_ipmi fence_ipmilan \
>>     pcmk_host_list="pcmk-2" ipaddr="pcmk-2.ipmi" \
>>     action="reboot" login="admin" passwd="secret" delay=15 \
>>     op monitor interval=60s
>>
>> is sufficient.
>>
> 
> Hi,
> 
> just two questions about setting these stonith:
> 
> - shouldn't the delay's be different to avoid a stonith-battle?

As Emmanuel said, yes, it is needed to avoid dual-fencing in two-node
clusters, though the issue is not restricted to rhcs (or any HA
clustering that allows two nodes).

The node with the 'delay="15"' will have a 15 second head-start, so in a
network partition triggered fence, the node with the delay should always
live and the node without the delay will be immediately fenced.

> - when creating these stonith I see them both started on one single
>   node. Don't I need some location constraints?  Such that "fence_pcmk1"
>   only runs on pcmk2 and vice versa?

What version of pacemaker are you using?

-- 
Digimer
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