On 06/22/2016 02:30 PM, Lentes, Bernd wrote: > Hi, > > we have a two node cluster. It is running a Web-Application. Web-Application > needs a MySQL Database, has static and dynamic (perlscripts) webpages. > I will make the DB HA with MySQL replication. > From time to time it's likely that something in the webapp is changed, so we > have to edit some scripts or install a perl module. > I would like have the changes automatically synchronized to the other side, > without any manual intervention. And also without knowing which node is the > active one. > I'm thinking about putting /srv/www and /usr/lib/perl5 on a DRBD device in an > active/active webapp. For that i need a cluster FS and DLM, right ? > This should synchronize automatically in both directions ? How are you applying your updates? Especially under /usr/lib/perl5 the packet-management should be used. That said you would confuse your packet-management when the files change without the local database being updated. > Do the services have to a ressource for this setup of DRBD or is it possible > to have them as "normal" services, started by init. > Or is it better to have them as ressources because other services will also > run in this HA-system (likely some virtual machines) ? If you are having the mentioned subtrees on DRBD mounting a filesystem, after the drbd-device is up, will be involved and doing that is probably not a good idea while the subtree is actively used. So I would opt for having everything that is using the subtree under HA control.
regards, Klaus > > Thanks. > > > Bernd > _______________________________________________ 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
