[ClusterLabs] syntax question regarding pcs order sets

[Tomas Jelinek]

Dne 12.6.2015 v 04:13 Dennis Jacobfeuerborn napsal(a):
> On 10.06.2015 14:27, Tomas Jelinek wrote:
>> Dne 10.6.2015 v 00:38 Dennis Jacobfeuerborn napsal(a):
>>> Hi,
>>> I'm not sure if I understand the syntax correctly for pcs order sets:
>>>
>>> pcs constraint order set resource1 resource2 [resourceN]... [options]
>>> [set resourceX resourceY ... [options]] [setoptions [constraint_options]]
>>>
>>> What I'm confused by is the two lists of resources. Is this simply a way
>>> to define several sets in one go or would there also exist an order
>>> constraint between the two defined sets themselves?
>>
>> Hi Dennis,
>> It allows you to specify more sets in one constraint. For better
>> understanding how this works you can check out Pacemaker Explained:
>> http://clusterlabs.org/doc/en-US/Pacemaker/1.1-pcs/html-single/Pacemaker_Explained/index.html#s-resource-sets-ordering
>>
>>
>> For example this command:
>> pcs constraint order set A B sequential=false set C D sequential=true
>> set E F sequential=false
>> creates a constraint which is described in Example 6.11. and Figure 6.3.
>> in Pacemaker Explained.
>
> Ah, so these are multiple sets but it also implies a sequential ordering
> among these sets.
>
> So given my example: "drbd_clone:Master -> fs1 -> fs2 -> fs3"
> Would this be the correct pcs syntax?
>
> pcs constraint order set drbd_clone action=promote set fs1 fs2 fs3
> action=start sequential=true

It looks fine to me.

Regards,
Tomas
>
> Regards,
>    Dennis
>
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