multiple configurations with repmgr

Started by ROS Didierover 7 years ago3 messagesgeneral
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#1ROS Didier
didier.ros@edf.fr

Hi
We are going to use repmgr with one node for the primary, one node for the standby and one node for the witness.
It works fine with one project.

The problem is that we want to have several other projects. Each one with its own primary node, its own standby node and the same witness node.
Question : is it possible to do that ? One witness node which surveys several other nodes.

Thanks in advance

Best Regards
[cid:image002.png@01D14E0E.8515EB90]

Didier ROS
Expertise SGBD
DS IT/IT DMA/Solutions Groupe EDF/Expertise Applicative - SGBD
Nanterre Picasso - E2 565D (aile nord-est)
32 Avenue Pablo Picasso
92000 Nanterre

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#2Nicolas Karolak
nicolas.karolak@ubicast.eu
In reply to: ROS Didier (#1)
Re: multiple configurations with repmgr

As far as i know, repmgr work at the "cluster" level so you would need
to run another postgres "cluster" instance (running on another port)
and another repmgrd instance (which would load a configuration
pointing to the new "cluster").

Regards,
Nicolas KAROLAK | Linux Systems Engineer
6-8, rue André Voguet - 94200 Ivry-sur-Seine
+33 1 77 56 77 96 | www.ubicast.eu | www.ubicast.tv

Show quoted text

On Tue, Jan 8, 2019 at 5:17 PM ROS Didier <didier.ros@edf.fr> wrote:

Hi

We are going to use repmgr with one node for the primary, one node for the standby and one node for the witness.

It works fine with one project.

The problem is that we want to have several other projects. Each one with its own primary node, its own standby node and the same witness node.

Question : is it possible to do that ? One witness node which surveys several other nodes.

Thanks in advance

Best Regards

Didier ROS
Expertise SGBD
DS IT/IT DMA/Solutions Groupe EDF/Expertise Applicative - SGBD
Nanterre Picasso - E2 565D (aile nord-est)
32 Avenue Pablo Picasso
92000 Nanterre

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#3Martín Marqués
martin@2ndquadrant.com
In reply to: ROS Didier (#1)
Re: multiple configurations with repmgr

El 8/1/19 a las 13:17, ROS Didier escribi�:

Hi

�������������� We are going to use repmgr� with one node for the
primary, one node for the standby and one node for the witness.

�������������� It works fine _with one project_.

�

The problem is �that we want to have several other projects. Each one
with its own primary node, its own standby node and the _same witness node._

�������������� Question : is it possible to do that ? _One witness node_
which surveys several other nodes.

Yes, you can accomplish that following the instructions below for
configuring the witness:

- Initialize the postgres server on the witness node
- Create one database for each cluster the witness will be managing
- Create the appropriate repmgr.conf files, one for each cluster managed
through this witness, and each with the appropriate conninfo setting so
they point to different databases.
- Run `repmgr witness register` multiple times, using different
configuration files on each run

Hope that helps clarify.

P.S.: This works on latest versions of repmgr. Before 3.3 the witness
was created through repmgr which made things harder to manage, reason
why that was removed in later versions

Cheers,

--
Mart�n Marqu�s http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services