Message-ID: <d64e4eb55d54623550db9ccbe54699605029752e.camel@cybertec.at>
Subject: Re: Linux in-place upgrade
From: Laurenz Albe <laurenz.albe@cybertec.at>
To: Murthy Nunna <mnunna@fnal.gov>, "pgsql-admin@lists.postgresql.org"
	 <pgsql-admin@lists.postgresql.org>
Date: Mon, 26 Jun 2023 19:35:45 +0200
In-Reply-To: 
 <DM8PR09MB667703E79768433DAB4EBB3BB826A@DM8PR09MB6677.namprd09.prod.outlook.com>
References: 
	<DM8PR09MB667703E79768433DAB4EBB3BB826A@DM8PR09MB6677.namprd09.prod.outlook.com>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
User-Agent: Evolution 3.46.4 (3.46.4-1.fc37) 
MIME-Version: 1.0
Archived-At: 
 <https://www.postgresql.org/message-id/d64e4eb55d54623550db9ccbe54699605029752e.camel%40cybertec.at>
Precedence: bulk

On Mon, 2023-06-26 at 17:13 +0000, Murthy Nunna wrote:
> We are planning an in-place upgrade of Linux level from RHEL 7 to RHEL 8 =
or RHEL 9.
> We have several PG clusters running on this server using different versio=
ns of postgres (pg12, pg13 and pg14).
> =C2=A0
> We have couple of plans:
> =C2=A0
> =C2=A0=C2=A0=C2=A01. Shutdown clusters, unmount disks that contain postgr=
es data and wals, upgrade Linux,
>       remount postgres disks and restart postgres clusters
> =C2=A0=C2=A0=C2=A02. Same as above but reinstall postgres (pg12, pg13 and=
 pg14) before restarting postgres clusters
> =C2=A0
> Questions:
> =C2=A0=C2=A0=C2=A01. Will 1 or 2 or both above work?
> =C2=A0=C2=A0=C2=A02. Is there any official documentation above OS upgrade=
s?

The documentation is here:
https://www.postgresql.org/docs/current/upgrading.html

It depends on how you installed PostgreSQL.  If you used binary packages, O=
ption 1 should work fine.

Don't forget to reindex all indexes on strings!

Yours,
Laurenz Albe