On Tue, 2018-03-06 at 10:11 +0100, Oscar Segarra wrote: > Hi, > > I'd like to recover this post in order to know if there is any way to > achieve this kind of simple HA system. > > Thanks a lot. > > 2017-08-28 4:10 GMT+02:00 Oscar Segarra <oscar.sega...@gmail.com>: > > Hi, > > > > In Ceph, by design there is no single point of failure I terms of > > server roles, nevertheless, from the client point of view, it might > > exist. > > > > In my environment: > > Mon1: 192.168.100.101:6789 > > Mon2: 192.168.100.102:6789 > > Mon3: 192.168.100.103:6789 > > > > Client: 192.168.100.104 > > > > I have created a line in /etc/festa referencing Mon but, of course, > > if Mon1 fails, the mount point gets stuck. > > > > I'd like to create a vip assigned to any host with tcp port 6789 UP > > and, in the client, mount the CephFS using that VIP. > > > > Is there any way to achieve this? > > > > Thanks a lot in advance!
The IP itself would be a standard floating IP address using the ocf:heartbeat:IPaddr2 resource agent. "Clusters from Scratch" has an example, though I'm sure you're familiar with that: http://clusterlabs.org/pacemaker/doc/en-US/Pacemaker/1.1/html/Clusters_ from_Scratch/_add_a_resource.html The interesting part is making sure that port 6789 is responding. The usual design in these cases is to put the service that provides that port under cluster control; its monitor action would ensure the port is responding, and a standard colocation constraint would ensure the IP can only run when the service is up. If for whatever reason, you can't put the service under cluster control, I see two approaches: (1) write a dummy agent whose monitor action checks the port, and colocate the IP with that; or (2) have a script check the port and set a node attribute appropriately, and use a rule-based location constraint for the IP (this approach would be useful mainly if you already have some script doing a check). -- Ken Gaillot <kgail...@redhat.com> _______________________________________________ Users mailing list: Users@clusterlabs.org https://lists.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