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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Alain Bourgeois <alain.bourgeois@zetes.com>
cc: "pgsql-docs@lists.postgresql.org" <pgsql-docs@lists.postgresql.org>
Subject: Re: pg_upgrade -c cannot be run if old cluster is running
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Comments: In-reply-to Alain Bourgeois <alain.bourgeois@zetes.com>
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Alain Bourgeois <alain.bourgeois@zetes.com> writes:
> /usr/lib/systemd/system/postgresql-10.service has PGDATA=3D/var/lib/pgsq=
l/10/data/, /var/lib/pgsql/10/data/postgtresql.conf holds data_directory =3D=
 '/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=3D/var/lib/pgsql/10/data.

			regards, tom lane