[Pacemaker] Migrate/run resource only if m/s resource is master/promoted on target node

[Dejan Muhamedagic]

Hi,

On Mon, Dec 28, 2009 at 03:45:28PM +0100, Martin Gombač wrote:
>
> Michael Schwartzkopff wrote:
>> Am Montag, 28. Dezember 2009 15:30:05 schrieb Martin Gombač:
>>   
>>> Michael Schwartzkopff wrote:
>>>     
>>>> Am Montag, 28. Dezember 2009 14:36:11 schrieb Martin Gombač:
>>>>       
>>>>> Hi,
>>>>>
>>>>> i have mostly working Xen + DRBD + Live migration + Resource fencing,
>>>>> but here is a slight issue with my crm config.
>>>>>
>>>>> I want for resource Hosting to migrate to other node only when the drbd
>>>>> resource there is primary. I did try to achieve this using ordering (see
>>>>> config below). Currently it can happen, that drbd resouce is still in
>>>>> slave (secondary) while migration starts. Example:
>>>>>         
>>>> What about a colocation constraints refering to the resource in master
>>>> state?
>>>>       
>>> I'm not sure what you mean. I think i already did this with:
>>>
>>> colocation Hosting_on_ms_drbd_r0 inf: Hosting ms_drbd_r0:Master
>>>
>>> Is this what you mean? If not, i'll be happy if you provide me with an
>>> example, or point me to the docs. :-)
>>>     
>>
>> Sorry, you also need ordering
>>
>> order ordDRBDHosting inf: ms_drbd_r0:promote Hosting:start
>>
>>   
>
> I did that already, just without adding :start:
> >
> order ms_drbd_r0_b4_Hosting inf: ms_drbd_r0:promote Hosting
> >
> Is this wrong, should i add :start to Hosting and behavior will change?

Yes. A tad counterintuitive, but the action of the second resource
defaults to the one specified for the first resource. Similar for
orders.

Thanks,

Dejan

> Here is the relevant part of my config again; order and collocation are  
> the last two lines:
> >
> primitive Hosting ocf:heartbeat:Xen \
>   params xmfile="/etc/xen/Hosting.cfg" \
>   meta target-role="Started" allow-migrate="true" is-managed="true" \
>   op monitor interval="120s" timeout="300s"
> primitive drbd_r0 ocf:linbit:drbd \
>   params drbd_resource="r0" \
>   op monitor interval="15s" role="Master" timeout="30s" \
>   op monitor interval="30s" role="Slave" timeout="30"
> ms ms_drbd_r0 drbd_r0 \
>   meta notify="true" master-max="2" inteleave="true"
> location cli-prefer-Hosting Hosting \
>   rule $id="cli-prefer-rule-Hosting" inf: #uname eq ibm1
> colocation Hosting_on_ms_drbd_r0 inf: Hosting ms_drbd_r0:Master
> order ms_drbd_r0_b4_Hosting inf: ms_drbd_r0:promote Hosting
> >
>
> Thank you for your time mr. Schwartzkopff,
> M.
>
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