[ClusterLabs] Location constraints for fencing resources?

Klaus Wenninger kwenning at redhat.com
Tue Sep 13 00:20:08 EDT 2016

Location-constraints for fencing-resources are definitely supported and
don't just work by accident - if this was the question.

On 09/13/2016 02:43 AM, Dan Swartzendruber wrote:
> On 2016-09-12 10:48, Dan Swartzendruber wrote:
>> Posting this as a separate thread from my fence_apc one.  As I said in
>> that thread, I created two fence_apc agents, one to fence node A and
>> one to fence node B.  Each was configured using a static pcmk node
>> mapping, and constrained to only run on the other node.  In the
>> process of testing this, I discovered a bug (feature?) in the LCMC GUI
>> I am using to manage the cluster.  To wit: when I click on a fence
>> object, it never seems to fetch the resource constraints (e.g. they
>> show in the GUI as "nothing selected"), so if I changes something (say
>> the power_wait timeout) and then click "Apply", the location
>> constraints are deleted from that fencing resource.  I also noticed
>> that if I connect to port 2224 (pcsd), regular resources show me the
>> location constraints, whereas fence resources don't, which is making
>> me wonder if this is not supported?  I'm thinking I can set up a
>> pcmk_host_map to tell it which APC outlet manages node A and which
>> manages node B, in which case I can just use one fence_apc resource
>> with a dynamic pcmk host list?  Thanks!
> Okay, this *seems* to work.  e.g. pcmk_host_list has the two hosts. 
> pmck_host_map says nas1:8;nas2:2.  The fencing agent was running on
> nas2.  I logged in to nas2 and did 'systemctl stop network'. 
> pacemaker moved the fencing resource to nas1, then power-cycled nas2. 
> Looking good...
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