On Thu, Jan 31, 2013 at 1:02 AM, Brian J. Murrell <br...@interlinx.bc.ca> wrote: > I'm experimenting with asymmetric clusters and resource location > constraints. > > My cluster has some resources which have to be restricted to certain > nodes and other resources which can run on any node. Given that, an > "opt-in" cluster seems the most manageable. That is, it seems easier to > create constraints based on where things should run (i.e. a whitelist) > rather than having to maintain lists of where things shouldn't run > (blacklists). > > I wonder though for the case of a resource that can run anywhere, if > there is any more elegant way to specify that in an asymmetric cluster > other than creating an expression using something like the "#uname" > attribute with an operation of "ne" and specifying a host that doesn't > exist for the expression's "value".
You can also use an operation of "defined". No dummy value needed in that case. > > Of course other attributes could be used in a negative fashion such as > this but I wonder if there is a more "positive" syntax to express > "anywhere". Ideally, I'd like the expression to be absolutely clear > that it's intention is to allow the resource to run "anywhere" rather > than the reader having to deduce that by knowing that the node specified > doesn't exist. > > Alternatively, if there is a way to "whitelist" (i.e. meaning not having > to create and maintain a list of where not to run a resource) where > resources can run on a symmetric cluster that might be an acceptable > alternative. > > Cheers, > b. > > > _______________________________________________ > 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 > _______________________________________________ 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