Date: Wed, 11 Jun 2025 15:53:07 -0400
From: Bruce Momjian <bruce@momjian.us>
To: Jim Cunning <jlcunning46@gmail.com>
Cc: Adrian Klaver <adrian.klaver@aklaver.com>,
	pgsql-general@lists.postgresql.org
Subject: Re: pg_upgradecluster version 10 to 16 question
Message-ID: <aEneo8E6U7ntAW5D@momjian.us>
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 <3183251c-4c06-490b-a0d7-8e2c6d0386e6@aklaver.com>
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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@momjian.us>        https://momjian.us
  EDB                                      https://enterprisedb.com

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