On Fri, Jul 19, 2013 at 04:49:21PM +0200, "Tomcsányi, Domonkos" wrote: > Hello everyone, > > I have been struggling with this issue for quite some time so I > decided to ask you to see if maybe you can shed some light on this > problem. > So here is the deal: > I have a 4-node cluster, from which 2-2 nodes belong together. > In ASCII art it would look like this: > > -------------- -------------- > | NODE1 | -- | NODE 2 | > -------------- -------------- > | | > | | > | | > -------------- -------------- > | NODE 3 | -- | NODE 4 | > -------------- -------------- > > Now the behaviour I would like to achieve: > If NODE 1 goes offline its services should get migrated to NODE 2 > AND NODE 3's services should get migrated to NODE 4. > If NODE 3 goes offline its services should get migrated to NODE4 AND > NODE1's services should get migrated to NODE 2. > Of course the same should happen vice versa with NODE 2 and NODE 4. > > The services NODE1 and 2 are the same naturally, but they differ > from NODE 3's and 4's services. So I added some 'location' > directives to the config so the services can only be started on the > right nodes. > I tried 'colocation' which is great, but not for this kind of > behaviour: if I colocate both resource groups of NODE 1 and 3 only > one of them starts (of course, because colocation means the > resource/resource group(s) should be running on the same NODE, so my > location directives kick in and prevent for example NODE 3's > services from starting on NODE 1). > > So my question is: is it possible to define such behaviour I > described above in Pacemaker? If yes, how?
You may use node attributes in colocation constraints. So you would give your nodes attributes, first: crm node attribute NODE1 set color pink attribute NODE3 set color pink attribute NODE2 set color slime attribute NODE4 set color slime crm configure colocation c-by-color inf: rsc_a rsc_b rsc_c node-attribute=color The "implicit default" node-attribute is #uname ... so using "color" the resources only need to run on nodes with the same value for the node-attribute "color". Lars -- : Lars Ellenberg : LINBIT | Your Way to High Availability : DRBD/HA support and consulting http://www.linbit.com DRBD® and LINBIT® are registered trademarks of LINBIT, Austria. _______________________________________________ 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://bugs.clusterlabs.org