[Pacemaker] Question on resource groups

[Ken Dechick]

Thanks very much Dejan! That's exactly the information I needed!

Kenneth M DeChick
Linux Systems Administrator
Community Computer Service, Inc.
(315)-255-1751 ext154
http://www.medent.com
kend at medent.com
Registered Linux User #497318
-- -- -- -- -- -- -- -- -- -- --
"You canna change the laws of physics, Captain; I've got to have thirtyminutes! "

.

---------- Original Message -----------
From: Dejan Muhamedagic <dejanmm at fastmail.fm> 
To: pacemaker at clusterlabs.org, kend at medent.com 
Sent: Tue, 19 Jan 2010 18:18:47 +0100 
Subject: Re: [Pacemaker] Question on resource groups

> Hi, 
> 
> On Tue, Jan 19, 2010 at 11:38:06AM -0500, Ken Dechick wrote: 
> > Hello all, 
> > 
> > Quick question here today. Please forgive me if this has been 
> > answered, I have searched for a couple days and not been able 
> > to come up with the answer. I am working on a standard 2 node 
> > cluster using DRBD and I have my resources in a group. All in 
> > working well, but my question has to do with what happens when 
> > there is a problem with an individual service. Consider the 
> > following example using heartbeat (3.0.1-1) drbd (8.3.6) and 
> > pacemaker (1.0.6): 
> > 
> > Cluster with one reosurce group which contains these resources in this order: 
> >    
> >    -drbd master/slave 
> >    -virtual file system 
> >    -openvpn 
> >    -samba 
> >    -apache webserver 
> >    -cupsd 
> > 
> > Problem I am running into is if there is a problem with openvpn 
> > in this example (VPN goes down and keys are missing so it 
> > CANNOT restart without intervention), watching the cluster with 
> > crm_mon, I see that all the services under openvpn in order 
> > (samba,apache, cupsd) will all starta "rolling restart". In 
> > other words, I see openvpn fail, then samba goes down, then 
> > apache goes down, then cups goes down. Next cups comes up, 
> > apache comes up, samba comes up, then openvpn tries to start 
> > but fails so the progress starts over - smba, apache and cups 
> > stop then start again. What I end up with is a system where 
> > those last 3 services which runs fine alone keep coming up then 
> > going down again, over and over. Only way I can change this is 
> > to fix the openvpn issue, then things restart and stay 
> > restarted. 
> > 
> > My question is: is this normal (expected) behavior? 
> 
> Yes. 
> 
> > If so how 
> > do I change this? 
> 
> Reconfigure. Your group doesn't represent properly the relations 
> between resources. I guess that all the four resources depend on 
> drbd and filesystem, but not on each other. You can then create 
> non-ordered group with those four resources and collocate/order 
> that group with the drbd/fs group. 
> 
> Thanks, 
> 
> Dejan 
> 
> > I have tried several on-fail options in the 
> > monitors for those services (tried: stop, restart, and block) 
> > but this doesn't change the behavior. I would like to just have 
> > the one service stop without affecting the others. Do I need to 
> > re-think using a resource group?? Any assistance would be 
> > greatly appreciated. The pacemaker site has a lot of 
> > documentation but it's not the clearest explainations at times. 
> > 
> > -Thanks 
> > 
> > Kenneth M DeChick 
> > Linux Systems Administrator 
> > Community Computer Service, Inc. 
> > (315)-255-1751 ext154 
> > http://www.medent.com 
> > kend at medent.com 
> > Registered Linux User #497318 
> > -- -- -- -- -- -- -- -- -- -- -- 
> > "You canna change the laws of physics, Captain; I've got to have thirtyminutes! " 
> > 
> > . 
> >   
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> 
> > _______________________________________________ 
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