[ClusterLabs] Make sure either 0 or all resources in a group are running

[Sam Gardner]

Unstandby-ing a node automatically at some point after a failure on
certain resources actually fits our use cases well, but the problem is
that the automatic unstandby does not put DRBD into secondary mode once it
occurs.

A manual pcs cluster standby $(uname -n) and pcs cluster unstandby $(uname
-n) does restart the state of the node properly, however.

--
Sam Gardner
Trustwave | SMART SECURITY ON DEMAND







On 3/28/16, 4:31 PM, "Sam Gardner" <SGardner at trustwave.com> wrote:

>'on-fail=standby' works well, however, setting a failure-timeout appears
>to automatically bring the node out of standby after it expires.
>
>--
>Sam Gardner
>Trustwave | SMART SECURITY ON DEMAND
>
>
>
>
>
>
>
>On 3/28/16, 3:31 PM, "Ken Gaillot" <kgaillot at redhat.com> wrote:
>
>>On 03/28/2016 02:19 PM, Sam Gardner wrote:
>>> Is there any way to modify the behavior of a resource group N of A, B,
>>>and C so that either A, B, and C are running on the same node, or none
>>>of them are?
>>>
>>> With Pacemaker 1.1.12 and Corosync 1.4.8, if a group N is defined via:
>>> pcs resource group N A B C
>>>
>>> if resource C cannot run, A and B still do.
>>>
>>> --
>>> Sam Gardner
>>> Trustwave | SMART SECURITY ON DEMAND
>>
>>The problem with that model is that none of the resources can be placed
>>or started, because each depends on the others being placed and started
>>already.
>>
>>I can think of two similar alternatives, though they would only work for
>>failures, not for any other reasons C might be stopped:
>>
>>* Use on-fail=standby, so that if any resource fails, all resources are
>>forced off that node. The node must be manually taken out of standby to
>>be used again.
>>
>>* Use rules to say that A cannot run on any node where fail-count-B gt 0
>>or fail-count-C gt 0, and B cannot run on any node where fail-count C gt
>>0. (The group should handle the rest of the dependencies.)
>>
>>
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