[ClusterLabs] Two nodes cluster issue

[Klaus Wenninger]

On 07/24/2017 02:05 PM, Kristián Feldsam wrote:
> Hello, you have to use second fencing device, for ex. APC Switched PDU.
>
> https://wiki.clusterlabs.org/wiki/Configure_Multiple_Fencing_Devices_Using_pcs

Problem here seems to be that the fencing devices available are running from
the same power-supply as the node itself. So they are kind of useless to
determine
weather the partner-node has no power or simply is no reachable via network.
 
>
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>> On 24 Jul 2017, at 13:51, Tomer Azran <tomer.azran at edp.co.il> wrote:
>>
>> Hello,
>>  
>> We built a pacemaker cluster with 2 physical servers.
>> We configured DRBD in Master\Slave setup, a floating IP and file
>> system mount in Active\Passive mode.
>> We configured two STONITH devices (fence_ipmilan), one for each server.
>>  
>> We are trying to simulate a situation when the Master server crushes
>> with no power.
>> We pulled both of the PSU cables and the server becomes offline
>> (UNCLEAN).
>> The resources that the Master use to hold are now in Started
>> (UNCLEAN) state.
>> The state is unclean since the STONITH failed (the STONITH device is
>> located on the server (Intel RMM4 - IPMI) – which uses the same power
>> supply).
>>  
>> The problem is that now, the cluster does not releasing the resources
>> that the Master holds, and the service goes down.
>>  
>> Is there any way to overcome this situation?
>> We tried to add a qdevice but got the same results.

If you have already setup qdevice (using an additional node or so) you
could use
quorum-based watchdog-fencing via SBD.

>>  
>> We are using pacemaker 1.1.15 on CentOS 7.3
>>  
>> Thanks,
>> Tomer.
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-- 
Klaus Wenninger

Senior Software Engineer, EMEA ENG Openstack Infrastructure

Red Hat

kwenning at redhat.com   

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