[Pacemaker] 2 node Cluster

[Jake Smith]

From: Christian Gebler [mailto:geblerchristian at googlemail.com]
Sent: Tuesday, August 13, 2013 9:17 AM
To: The Pacemaker cluster resource manager
Subject: Re: [Pacemaker] 2 node Cluster



It works! Amazing....All the time I tried to fix it with the collocation. 
Thanks a lot for that solution! :)



Chris – I believe you were having issues because you had a resource set 
inside the colocation statement which causes the order of the elements to be 
reversed.  When you have more than two like resources in a colo they become 
a set and are evaluate in reverse:

colocation col_psql-server_on_drbd inf: g_webserver p_psql-server p_ip 
ms_drbd_r2_drbd2:Master ms_drbd_r0_drbd0:Master ms_drbd_r1_drbd1:Master

So the above was really collocating in this way:

p_ip p_psql-server g_webserver      ms_drbd_r1_drbd1:Master 
ms_drbd_r0_drbd0:Master ms_drbd_r2_drbd2:Master

Only way to be sure would be/have been to run crm configure show xml.  The 
xml output of the config will display the colocation statement in the order 
it is actually going to happen as opposed to the way it’s written in crmsh

More conversation on that here: 
http://www.gossamer-threads.com/lists/linuxha/pacemaker/80622

HTH

Jake





2013/8/13 tech-ha <tech.ha01 at gmail.com <mailto:tech.ha01 at gmail.com> >

a group instead of a collocation. in group,  ip -> db -> nginx






在 2013-8-13，17:56，Christian Gebler <geblerchristian at googlemail.com 
<mailto:geblerchristian at googlemail.com> > 写道：

Hi,

I am trying to set up a 2 node Pacemaker-Cluster with a few services (drbd, 
psql, ip, tomcat, nginx).
All these services should run on one node, all the time, if one service is 
down, everything must migrate to the other node.

So I created one colocation and one order, that works fine and all services 
run and migrate as expected.
But I have one problem...if I stop my Tomcat or Nginx (on the CRM CLI), the 
database and the ip goes down too, but that should not happen. I have no 
idea how to fix this problem, so I hope you can help me. Or is the only 
solution to unmanage the Service at first?

Thx!

Chris


Here is my Config:

http://goo.gl/FkeqlH

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