Обсуждение: Upgrading hot standbys

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Upgrading hot standbys

От
Aaron Burnett
Дата:


Greetings,


I'm in the process of upgrading PG 9.1.3 to 9.4.1 in the near future.


I have several machines which each house unique databases. Each of those are replicated to a standby server with matching configurations. A total of 10 servers, 5 masters, 5 slaves. Everything runs on Ubuntu.


My question, as I can't seem to find any documentation on this part, is once I successfully upgrade the master I will need to upgrade the standby as well. Will I have to rebuild the standby from scratch, or will the standby pick up where it was before the upgrade if I do things correctly?


Thanking you in advance,



Aaron

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Re: Upgrading hot standbys

От
Magnus Hagander
Дата:
On Wed, Apr 29, 2015 at 6:19 AM, Aaron Burnett <Aaron.Burnett@us.dunnhumby.com> wrote:


Greetings,


I'm in the process of upgrading PG 9.1.3 to 9.4.1 in the near future.


I have several machines which each house unique databases. Each of those are replicated to a standby server with matching configurations. A total of 10 servers, 5 masters, 5 slaves. Everything runs on Ubuntu.


My question, as I can't seem to find any documentation on this part, is once I successfully upgrade the master I will need to upgrade the standby as well. Will I have to rebuild the standby from scratch, or will the standby pick up where it was before the upgrade if I do things correctly?



You upgrade the master, and then you rebuild the standbys from a new basebackup (using pg_basebackup or manually with start/stop backups etc). You can't upgrade the standbys and have them re-join the master, they have to be redone from scratch.
 
--
 Magnus Hagander
 Me: http://www.hagander.net/
 Work: http://www.redpill-linpro.com/

Re: Upgrading hot standbys

От
Bruce Momjian
Дата:
On Wed, Apr 29, 2015 at 01:13:13PM +0200, Magnus Hagander wrote:
> On Wed, Apr 29, 2015 at 6:19 AM, Aaron Burnett <Aaron.Burnett@us.dunnhumby.com>
> wrote:
>
>
>
>     Greetings,
>
>
>     I'm in the process of upgrading PG 9.1.3 to 9.4.1 in the near future.
>
>
>     I have several machines which each house unique databases. Each of those
>     are replicated to a standby server with matching configurations. A total of
>     10 servers, 5 masters, 5 slaves. Everything runs on Ubuntu.
>
>
>     My question, as I can't seem to find any documentation on this part, is
>     once I successfully upgrade the master I will need to upgrade the standby
>     as well. Will I have to rebuild the standby from scratch, or will the
>     standby pick up where it was before the upgrade if I do things correctly?
>
>
>
>
> You upgrade the master, and then you rebuild the standbys from a new basebackup
> (using pg_basebackup or manually with start/stop backups etc). You can't
> upgrade the standbys and have them re-join the master, they have to be redone
> from scratch.

Well, 9.5's pg_upgrade manual page has instructions on upgrading
streaming standbys via rsync, and it will work for all versions of
pg_upgrade back to 9.0:

    http://www.postgresql.org/docs/devel/static/pgupgrade.html

Let me know if you have any problems.

--
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + Everyone has their own god. +