[Pacemaker] Reg. clone and order attributes

[ESWAR RAO]

Hi Vladislav,

I used the below advisory colocation but its not working.
On 3 node setup:

I have configured all 3 resources in clone mode to start only on node1 and
node2 with a fail-count of only 1.
+++++++++++++++++++++++++++++++++++++++
+ crm configure primitive res_dummy_1 lsb::dummy_1 meta allow-migrate=false
migration-threshold=1 op monitor interval=5s
+ crm configure clone dummy_1_clone res_dummy_1 meta clone-max=2
globally-unique=false
+ crm configure location dummy_1_clone_prefer_node dummy_1_clone -inf:
node-3
+++++++++++++++++++++++++++++++++++++++
advisory ordering:
+ crm configure order 1-BEFORE-2 0: dummy_1_clone dummy_2_clone
+ crm configure order 2-BEFORE-3 0: dummy_2_clone dummy_3_clone

+++++++++++++++++++++++++++++++++++++++
advisory colocation:
#  crm configure colocation node-with-apps inf: dummy_1_clone dummy_2_clone
dummy_3_clone
+++++++++++++++++++++++++++++++++++++++

After I killed dummy_1 on node1 , i expected the pacemaker to kill dummy_2
and dummy_3 on node1 and not to disturb the apps on node2.

But with above colocation rule, it stopped the apps on node1 but it
restarted dummy_2 and dummy_3 on node2.

With a score of 0: it didn't stop dummy_2 and dummy_3 on node1.
With a score of 500: it stopped only dummy_2 and restarted dummy_2 on node2.


Thanks
Eswar



On Fri, Dec 6, 2013 at 12:20 PM, ESWAR RAO <eswar7028 at gmail.com> wrote:

>
> Thanks Vladislav.
> I will work on that.
>
> Thanks
> Eswar
>
> On Fri, Dec 6, 2013 at 11:05 AM, Vladislav Bogdanov <bubble at hoster-ok.com>wrote:
>
>> 06.12.2013 07:58, ESWAR RAO wrote:
>> > Hi All,
>> >
>> > Can someone help me with below configuration??
>> >
>> > I have a 3 node HB setup (node1, node2, node3) which runs HB+pacemaker.
>> > I have 3 apps dummy1, dummy2 , dummy3 which needs to be run on only 2
>> > nodes among the 3 nodes.
>> >
>> > By using the below configuration, I was able to run 3 resources on 2
>> nodes.
>> >
>> > # crm configure primitive res_dummy1 lsb::dummy1 meta
>> > allow-migrate="false" migration-threshold=3 failure-timeout="30s"
>> > op monitor interval="5s"
>> > # crm configure location app_prefer_node res_dummy1 -inf: node3
>>
>> First that comes to mind is that you should put above line below the
>> next one and refer app_clone instead of res_dummy1.
>>
>> > # crm configure clone app_clone res_dummy1 meta clone-max="2"
>> > globally-unique="false"
>> >
>> >
>> > I have a dependency order like dummy2 should start after dummy1 and
>> > dummy3 should start only after dummy2.
>> >
>> > For now I am keeping a sleep in the script and starting the resources by
>> > using crm.
>> >
>> > Is there any clean way to have the dependency on the resources so that
>> > ordering is maintained while clone is run on bot the nodes??
>> >
>> > I have tried with below config but couldn't succeed.
>> > # crm configure order dum1-BEFORE-dum2 0: res_dummy1 res_dummy2
>>
>> The same is here.
>>
>> > # crm configure order dum2-BEFORE-dum3 0: res_dummy2 res_dummy3
>>
>> So, your example should look like:
>> # crm configure primitive res_dummy1 lsb::dummy1 meta
>> allow-migrate="false" migration-threshold=3 failure-timeout="30s"
>> op monitor interval="5s"
>> # crm configure clone app_clone res_dummy1 meta clone-max="2"
>> globally-unique="false"
>> # crm configure location app_prefer_node app_clone -inf: node3
>> # crm configure order dum1-BEFORE-dum2 0: app_clone res_dummy2
>> # crm configure order dum2-BEFORE-dum3 0: res_dummy2 res_dummy3
>>
>> > Instead of group i used order , so that even if 1 app gets restarts
>> > others will not be affected.
>>
>> Yep, advisory ordering is fine for that.
>>
>> >
>> > Also is there any way so that if 1 app fails more than
>> > migration-threshold times, we can stop all 3 resources on that node??
>>
>> Maybe advisory colocations can do something similar (I'm not sure)?
>>
>> http://clusterlabs.org/doc/en-US/Pacemaker/1.1/html/Pacemaker_Explained/_advisory_placement.html
>>
>> You should find correct value for its score (positive or negative)
>> though. crm_simulate is your friend for that.
>>
>> >
>> > Thanks
>> > Eswar
>> >
>> >
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>> >
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>> >
>>
>>
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>
>
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