From: | Jehan-Guillaume de Rorthais <ioguix(at)free(dot)fr> |
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To: | Dylan Luong <Dylan(dot)Luong(at)unisa(dot)edu(dot)au> |
Cc: | "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: Postgres HA |
Date: | 2017-02-23 08:28:29 |
Message-ID: | 20170223092829.649fe7bd@firost |
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Lists: | pgsql-general |
On Wed, 22 Feb 2017 22:58:10 +0000
Dylan Luong <Dylan(dot)Luong(at)unisa(dot)edu(dot)au> wrote:
> Hi
>
> I am a DBA at the University of South Australia. For PostgreSQL High
> Availability, we currently have setup a Master/Slave across two datacenters
> using PostgreSQL (WAL) streaming replication. We use an LTM (load balancer)
> server that sits between the application servers and the PostgreSQL server
> that directs connections to the Master (and the Slave if failover occurs). We
> also have watchdog processes on the PostgreSQL servers that polls the LTM to
> determine who is Master and perform automatic failover if required.
And how do you deal with split brain ? Fencing? Network partition? What if the
network fail on the master side for 5 minutes? Will the LTM go back to the old
master as soon as the watchdog pool it again?
> I am looking at options to improve our high availability. I would like to
> know how other organizations in different industries (other than education)
> setup High Availability on their PostgreSQL environments. What tools do you
> use. Are they commercial licensed products? How is the architecture setup and
> how do you do recovery of new slave. Your information is greatly appreciated.
We use Pacemaker with the PAF[1] resource agent. Pacemaker takes great care to
avoid split brain using fencing. It mostly supports local cluster, but it
supports multi-site clusters as well thanks to a layer called "Cluster Ticket
Registry"[2].
HA is a complex subject, it requires some time to get familiar with it. Good
luck :)
[1] http://dalibo.github.io/PAF/
[2] http://clusterlabs.org/doc/en-US/Pacemaker/1.1/html/Pacemaker_Explained/ch15.html
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