[Pacemaker] Reg. clone and order attributes
Vladislav Bogdanov
bubble at hoster-ok.com
Sat Dec 7 04:17:34 EST 2013
06.12.2013 14:07, ESWAR RAO wrote:
> Hi Vladislav,
>
> I used the below advisory colocation but its not working.
Do be frank, I'm not sure if it even possible to achieve such "exotic"
behavior with just pacemaker in a non-fragile way, that was just a
suggestion.
But you may also play with CIB editing from within resource agent code,
f.e. remove some node attributes your resources depend on (with location
constraints) when threshold is reached, or something similar.
> 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
> <mailto: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 <mailto: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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