Alan Conway wrote: > Chrissie Caulfield wrote: >> Alan Conway wrote: >>> I've got a cluster app that works fine with corosync alone. Hoever if >>> I start corosync via cman I get errno 11 - "access denied" from >>> cpg_init. Is there some different security rule when cman is in play? >> >> cman enables quorum, and many IPC calls are blocked when the cluster is >> inquorate - including CPG. So it could be simply that you need to make >> sure your cluster has quorum. >> > > Ok good to know - so I can't start any CPG app until the cluster is > quorate? > > I was under the impression that my app needed to call cman_is_quorate > itself and delay startup till it gets a true value. Also that it should > check cman_is_quorate while running and shut down if it ever loses > quorum. Are you saying that both of these things will happen > automatically and I can delete all that code?
Shutting down if an app loses quorum is probably a little drastic ;-) But cpg will block calls if the cluster is not quorate, so you can remove any calls that prevent messages being sent around an inquiorate cluster, yes. > For start-up, how can I get my app started after cman gets a quorum? I > guess I can't just use regular /etc/init.d scripts since I have no way > of knowing when quorum is achieved - is there some way to schedule apps > to be started by cman once quorate? cmannotifyd is probably what you want here. It can run arbitrary scripts when the cman state changes - nodes up and down. It sets the environment variable CMAN_NOTIFICATION_QUORUM so you can start applications if necessary. Of course, you can do it the 'old' way by waiting in a cman_dispatch loop for quorum to be achieved before attempting a cpg connection. Chrissie _______________________________________________ Openais mailing list [email protected] https://lists.linux-foundation.org/mailman/listinfo/openais
