Re: pg_upgrade -c cannot be run if old cluster is running - Mailing list pgsql-docs

> On 5 Sep 2024, at 15:39, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>
> Alain Bourgeois <alain.bourgeois@zetes.com> writes:
>> /usr/lib/systemd/system/postgresql-10.service has PGDATA=/var/lib/pgsql/10/data/,
/var/lib/pgsql/10/data/postgtresql.confholds data_directory = '/mnt/pgdata/pgdir' 
>
> This is probably the source of your problem.  IIRC, pg_upgrade
> needs to be pointed at the actual old data directory, not
> PGDATA=/var/lib/pgsql/10/data.

Correct, pg_upgrade use the PGDATANEW and PGDATAOLD env variables for the
cluster data directories.

--
Daniel Gustafsson