Re: pg_upgradecluster version 10 to 16 question

On Wed, Jun 11, 2025 at 11:59:24AM -0700, Jim Cunning wrote:
> I configured the PGDG repository and tried to install postgresql-10 on my
> kubuntu 24.04 LTS desktop system, but apt refused to install it because of
> unsatisfied dependencies.  I then installed kubuntu 22.04 LTS on a backup
> system and was able to install postgresql-10 there.  I was able to use pg_dump
> to recover all the data and move it to the replacement server running ubuntu
> 24.04 LTS with postgresql-16.  All should be good.  Thanks for the help.

Uh, newer vesions of pg_dump should be able to dump from a PG 10
cluster.

---------------------------------------------------------------------------

>
> On 6/10/25 13:17, Adrian Klaver wrote:
>
> On 6/10/25 13:14, Adrian Klaver wrote:
>
> On 6/10/25 13:01, Jim Cunning wrote:
>
> I had a Ubuntu 20.04 LTS system with a postgresql version 10
> database, and the system became unbootable.  The database was
> stored in /var/lib/postgresql/10/main and I was able to recover the
> entire contents of the data in that directory and below.  I now
> have a system running ubuntu 24.04 LTS with postgresql version 16.
>
> I obviously no longer have a running version 10 server, so I cannot
> use pg_dump to retrieve the data.  I have placed the recovered
> version files in /var/lib/postgresql/10/main on my new system,
> alongside the /var/lib/postgresql/16/main that was created when I
> installed postgresql.  I have tried several iterations of the
> pg_upgradecluster command, a Python script provided by Ubuntu, but
> it says it cannot find the database files.
>
> I also see from the postgresql wiki pages that there is a
> pg_upgrade utility program, but cannot find in any of the
> Ubuntu-provided installation files.  Can anyone provide some
> guidance on how I might proceed?
>
>
> 1) Do:
>
> man pg_upgradecluster
>
> 2) Assuming you used the PGDG repos to install Postgres you can do:
>
> sudo apt install postgresql-10
>
> to get a Postgres 10 install. I would move the /var/lib/postgresql/10/
> main you created out of the way and then move the contents back in to
> the installed version.
>
>
> Forgot to say, be sure and retain a copy of the original 10 $DATADIR
> somewhere where you can fetch it should the above not work as planned.
>
>
>
>
>
> Thanks in advance.
>
>
>
>
>
>
>

--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com

Do not let urgent matters crowd out time for investment in the future.