Message-ID: <ea4eabff-764b-4221-af10-12796969b515@gmail.com>
Date: Wed, 11 Jun 2025 11:59:24 -0700
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Subject: Re: pg_upgradecluster version 10 to 16 question
To: Adrian Klaver <adrian.klaver@aklaver.com>,
 pgsql-general@lists.postgresql.org
References: <cb7713f2-8ff9-42eb-a3fa-a89c4dc8257a@gmail.com>
 <98182efc-eb12-42f0-8016-01163b5c6fcb@aklaver.com>
 <3183251c-4c06-490b-a0d7-8e2c6d0386e6@aklaver.com>
From: Jim Cunning <jlcunning46@gmail.com>
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    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.<br>
    <br>
    <div class="moz-cite-prefix">On 6/10/25 13:17, Adrian Klaver wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:3183251c-4c06-490b-a0d7-8e2c6d0386e6@aklaver.com">On
      6/10/25 13:14, Adrian Klaver wrote:
      <br>
      <blockquote type="cite">On 6/10/25 13:01, Jim Cunning wrote:
        <br>
        <blockquote type="cite">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.
          <br>
          <br>
          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.
          <br>
          <br>
          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?
          <br>
        </blockquote>
        <br>
        1) Do:
        <br>
        <br>
        man pg_upgradecluster
        <br>
        <br>
        2) Assuming you used the PGDG repos to install Postgres you can
        do:
        <br>
        <br>
        sudo apt install postgresql-10
        <br>
        <br>
        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.
        <br>
      </blockquote>
      <br>
      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.
      <br>
      <br>
      <blockquote type="cite">
        <br>
        <blockquote type="cite">
          <br>
          Thanks in advance.
          <br>
          <br>
        </blockquote>
        <br>
      </blockquote>
      <br>
    </blockquote>
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