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Thanks very much Dejan! That's exactly the information I needed!
<br />
<br />
<br /><font size="2">
<br />
<br />Kenneth M
DeChick
<br />Linux Systems
Administrator
<br />Community Computer Service,
Inc.
<br />(315)-255-1751
ext154
<br />http://www.medent.com
<br />kend@medent.com
<br />Registered Linux User
#497318
<br />-- -- -- -- -- -- -- -- -- --
--
<br />
"You canna change the laws of physics, Captain; I've got to have
thirty
minutes!
"
<br />
<br />.
<center><img src="https://www.medent.com/openwebmail/images/defmailsig.jpg" /></center>
<br />
<br /><b>----------
Original Message
-----------</b>
<br />
From: Dejan Muhamedagic <dejanmm@fastmail.fm>
<br />
To: pacemaker@clusterlabs.org, kend@medent.com
<br />
Sent: Tue, 19 Jan 2010 18:18:47 +0100
<br />
Subject: Re: [Pacemaker] Question on resource groups
<br />
<br />> Hi,
<br />>
<br />>
On Tue, Jan 19, 2010 at 11:38:06AM -0500, Ken Dechick wrote:
<br />>
> Hello all,
<br />>
>
<br />>
> Quick question here today. Please forgive me if this has been
<br />>
> answered, I have searched for a couple days and not been able
<br />>
> to come up with the answer. I am working on a standard 2 node
<br />>
> cluster using DRBD and I have my resources in a group. All in
<br />>
> working well, but my question has to do with what happens when
<br />>
> there is a problem with an individual service. Consider the
<br />>
> following example using heartbeat (3.0.1-1) drbd (8.3.6) and
<br />>
> pacemaker (1.0.6):
<br />>
>
<br />>
> Cluster with one reosurce group which contains these resources in this
order:
<br />>
>
<br />>
> -drbd master/slave
<br />>
> -virtual file system
<br />>
> -openvpn
<br />>
> -samba
<br />>
> -apache webserver
<br />>
> -cupsd
<br />>
>
<br />>
> Problem I am running into is if there is a problem with openvpn
<br />>
> in this example (VPN goes down and keys are missing so it
<br />>
> CANNOT restart without intervention), watching the cluster with
<br />>
> crm_mon, I see that all the services under openvpn in order
<br />>
> (samba,apache, cupsd) will all starta "rolling restart". In
<br />>
> other words, I see openvpn fail, then samba goes down, then
<br />>
> apache goes down, then cups goes down. Next cups comes up,
<br />>
> apache comes up, samba comes up, then openvpn tries to start
<br />>
> but fails so the progress starts over - smba, apache and cups
<br />>
> stop then start again. What I end up with is a system where
<br />>
> those last 3 services which runs fine alone keep coming up then
<br />>
> going down again, over and over. Only way I can change this is
<br />>
> to fix the openvpn issue, then things restart and stay
<br />>
> restarted.
<br />>
>
<br />>
> My question is: is this normal (expected) behavior?
<br />>
<br />>
Yes.
<br />>
<br />>
> If so how
<br />>
> do I change this?
<br />>
<br />>
Reconfigure. Your group doesn't represent properly the relations
<br />>
between resources. I guess that all the four resources depend on
<br />>
drbd and filesystem, but not on each other. You can then create
<br />>
non-ordered group with those four resources and collocate/order
<br />>
that group with the drbd/fs group.
<br />>
<br />>
Thanks,
<br />>
<br />>
Dejan
<br />>
<br />>
> I have tried several on-fail options in the
<br />>
> monitors for those services (tried: stop, restart, and block)
<br />>
> but this doesn't change the behavior. I would like to just have
<br />>
> the one service stop without affecting the others. Do I need to
<br />>
> re-think using a resource group?? Any assistance would be
<br />>
> greatly appreciated. The pacemaker site has a lot of
<br />>
> documentation but it's not the clearest explainations at times.
<br />>
>
<br />>
> -Thanks
<br />>
>
<br />>
> Kenneth M DeChick
<br />>
> Linux Systems Administrator
<br />>
> Community Computer Service, Inc.
<br />>
> (315)-255-1751 ext154
<br />>
> <a target="_blank" href="http://www.medent.com/">http://www.medent.com</a>
<br />>
> kend@medent.com
<br />>
> Registered Linux User #497318
<br />>
> -- -- -- -- -- -- -- -- -- -- --
<br />>
> "You canna change the laws of physics, Captain; I've got to have
thirtyminutes! "
<br />>
>
<br />>
> .
<br />>
>
<br />>
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<br />>
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<br />>
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<br />>
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<br />>
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