Re: Upgrade master / slave

From: Payal Singh <payal(at)omniti(dot)com>
To: Bertrand <b(dot)contacts(at)kifaisa(dot)com>
Cc: "pgsql-admin(at)postgresql(dot)org" <pgsql-admin(at)postgresql(dot)org>
Subject: Re: Upgrade master / slave
Date: 2015-10-06 23:19:48
Message-ID: CANUg7LB7w=ubrfC6WbuEmuqsUjCGoHKnt1PvsC6=zU2hSyqDCQ@mail.gmail.com
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You don't have to repeat the upgrade steps on slave after upgrading the
master. Once master is upgraded (using link option with pg_upgrade takes
the least amount of time
http://www.postgresql.org/docs/9.4/static/pgupgrade.html) you have to
install the new binaries and then rebuild slave from the master. You don't
have to upgrade slave separately. Although yes, rebuilding slave will take
a while, till which your cluster will be standalone. However, actual
downtime shouldn't be more than a few minutes.

Personally haven't used, but you might want to look into
http://slony.info/documentation/1.2/versionupgrade.html and see if it can
further reduce downtime, however it can be very complicated.

Payal Singh,
Database Administrator,
OmniTI Computer Consulting Inc.
Phone: 240.646.0770 x 253

On Tue, Sep 29, 2015 at 11:46 AM, Bertrand <b(dot)contacts(at)kifaisa(dot)com> wrote:

> Hello,
>
> Currently I use MySQL 5.6 but I plan to migrate to PostgreSQL.
> My application uses two databases : the total volume is 1TB on my hard
> drives.
>
> I made some tests on PostgreSQL administration but I have a problem with
> Master / Slave.
>
> How to update the cluster master / slave with a very short break time ?
> I tried to update a slave (9.3 => 9.4) and connect it to the master 9.3
> but it doesn't work.
>
> If I have to stop the master, migrate it to 9.4, start it and repeat these
> steps for the slaves the breaking time is really long.
>
> I thank you in advance.
>
> Bertrand
>

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