Hi, On Thu, Jun 02, 2011 at 08:44:46AM +0100, Luke Bigum wrote: > Hi list, > > I have a conceptual question about making Pacemaker treat some resources > a lot more important than others. I'm afraid the answer is going to come > back "sorry you can't", but I just want to confirm.
You were (most probably) right :) But it sounds interesting. Now, if java is not so important, why do you run it in the cluster? Thanks, Dejan > I have a simple 2 node cluster that runs two services (MySQL and a Java > daemon) on top of network attached storage that can float between both > nodes. CRM config looks a bit like: > > node node1 > node node2 > primitive lsb:mysql mysql > primitive lsb:java java > primitve lsb:storage storage > colocation mysql_with_storage inf: mysql storage > colocation java_with_storage inf: java storage > order mysql_after_storage: storage:start mysql:start symmetrical=true > order java_after_storage: storage:start java:start symmetrical=true > > I've got the interesting requirement that mysql is vastly more important > than the java resource. The java has to run on the same server as mysql. > Also, if mysql is stopped/unmanaged, the java should still be running on > what would be the correct node for mysql. I've mostly achieved this by > colocating the java and mysql to the underlying storage. > > It gets tricky when we start simulating hard failures. If we simulate a > hard error with mysql, the storage moves to another node, then mysql and > java, and everything's great. What I don't want is the opposite to > occur. I don't want any hard error with java to make the mysql move, as > I consider the mysql more important than java and I don't want to outage > mysql if the java has a problem. I'd love for the mysql to stay running > where it is and have an administrator come along and cleanup what's > wrong with the java. > > I guess I want to somehow describe the java resource as "not as > important" as mysql, and this is what I don't think is possible. I know > I'm talking about very edge cases by simulating hard errors (eg: monitor > return code 5), but it'd be nice to achieve. > > Any thoughts? > > Thanks in advance, > > -Luke > > -- > Luke Bigum > > Information Systems > luke.bi...@lmax.com | http://www.lmax.com > LMAX, Yellow Building, 1A Nicholas Road, London W11 4AN > > > The information in this e-mail and any attachment is confidential and is > intended only for the named recipient(s). The e-mail may not be disclosed or > used by any person other than the addressee, nor may it be copied in any way. > If you are not a named recipient please notify the sender immediately and > delete any copies of this message. Any unauthorized copying, disclosure or > distribution of the material in this e-mail is strictly forbidden. Any view > or opinions presented are solely those of the author and do not necessarily > represent those of the company. > > _______________________________________________ > Pacemaker mailing list: Pacemaker@oss.clusterlabs.org > http://oss.clusterlabs.org/mailman/listinfo/pacemaker > > Project Home: http://www.clusterlabs.org > Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf > Bugs: > http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker _______________________________________________ Pacemaker mailing list: Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/mailman/listinfo/pacemaker Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
