В Fri, 24 Jul 2015 14:43:37 +0000 David Gersic <dger...@niu.edu> пишет:
> I have a process (OpenSLP slpd) that I'd like to cluster. Unfortunately, this > process provides multiple services, depending what it finds in its > configuration file on startup. I need to have the process running on all of > the cluster nodes, but on one node I need to start it with an alternate > config file to enable some additional services. slpd itself supports an > alternate config file option on its command line. > > > What I'm trying to express is some combination of location and concurrency, > but I'm stumped at how to configure this. > > > Simplified, for a three node cluster with nodes node1, node2, node3, > configure three services, service1, service2, and service3, where > service[1-3] cannot coexist on the same node, but where service1 is more > important than service[2-3]. > > > So normally I'd have node1 running service1, node2 running service2, node3 > running service3. > > > If either node2 or node3 goes down, that's no big deal, service2 or service3 > goes down with it, but will come back up when the node returns to service. > > > If node1 goes down, I need to have service2 stopped, and service1 moved to > node2 (or service3/node3). When node1 returns, service1 moves back to node1 > and service2 is restarted on node2. > > Then set mandatory colocation constraint for each services 2 and 3 to not run on the same node as service1. Using crmsh like this colocation never_service2_with_service1 -inf: service2 service1 colocation never_service3_with_service1 -inf: service3 service1 This will cause pacemaker to evaluate placement of service1 first and then stop or move service2/3 if the only place where service1 can run is node where service2/3 is running. This is in addition to any other constraints you may want to add. _______________________________________________ Users mailing list: Users@clusterlabs.org http://clusterlabs.org/mailman/listinfo/users Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org