On Tue, 13 Aug 2019, 11:50 Shital A, <brightuser2...@gmail.com> wrote:
> > > On Mon, 12 Aug 2019, 18:54 Adrien Nayrat, <adrien.nay...@anayrat.info> > wrote: > >> On 8/12/19 2:57 PM, Shital A wrote: >> > >> > >> > Hello, >> > >> > Postgres version : 9.6 >> > OS:Rhel 7.6 >> > >> > We are working on HA setup for postgres cluster of two nodes in >> active-passive >> > mode. >> > >> > Installed: >> > Pacemaker 1.1.19 >> > Corosync 2.4.3 >> > >> > The pacemaker agent with this installation doesn't support automatic >> failback. >> > What I mean by that is explained below: >> > 1. Cluster is setup like A - B with A as master. >> > 2. Kill services on A, node B will come up as master. >> > 3. node A is ready to join the cluster, we have to delete the lock file >> it >> > creates on any one of the node and execute the cleanup command to get >> the node >> > back as standby >> > >> > Step 3 is manual so HA is not achieved in real sense. >> > >> > Please help to check: >> > 1. Is there any version of the resouce agent which supports automatic >> failback? >> > To avoid generation of lock file and deleting it. >> > >> > 2. If there is no such support, what checks should be added in pgsql RA >> to achieve >> > >> > Please suggest. >> > Thanks. >> > >> >> Hello, >> >> Which RA did you use? AFAIK there is two RA : >> - pgsql : >> https://github.com/ClusterLabs/resource-agents/blob/master/heartbeat/pgsql >> - PAF : http://clusterlabs.github.io/PAF/ (Which is different from pgsql >> RA : >> http://clusterlabs.github.io/PAF/FAQ.html#why-new-ra-for-postgresql) >> >> If I am right, PAF should handle the case when there no need to perform >> pgrewind >> (if the old master is not too advanced in the transaction log). >> >> Regards, >> >> -- >> Adrien NAYRAT >> https://blog.anayrat.info > > > > > Hello > > We are using the pgsql RA installed with pacemaker. > > Is PAF recommended over pgsql? > > Has anyone changed pgsql to handle the lock file and other cases that > might not have been handled? > > Please advise. > > Thanks. > Looks like the previous email bounced, received undelivered message. Sending again. We are using the pgsql RA installed with pacemaker and seems like it prevents failback by creating a lock file. We want to implement auto failback and need pointers on how to implement. Thanks.
