[Pacemaker] Reg. clone and order attributes
ESWAR RAO
eswar7028 at gmail.com
Sat Dec 7 06:30:16 EST 2013
Hi Vladislav,
Thanks for the response.
I will follow your suggestions.
I have configured my required configuration in a different manner:
(1) crm configure : all the 3 primitives
(2) crm configure colocation : for all the 3 primitives
(3) crm configure order : for the primitives
(4) Now I did clone for the 3 primitives
But I couldn't understand why pacemaker is giving errors with this type of
configuration.
Thanks
Eswar
On Sat, Dec 7, 2013 at 2:47 PM, Vladislav Bogdanov <bubble at hoster-ok.com>wrote:
> 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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