The following documentation comment has been logged on the website: Page: https://www.postgresql.org/docs/15/pgupgrade.html Description:
https://www.postgresql.org/docs/15/pgupgrade.html tells "You can use pg_upgrade --check to perform only the checks, even if the old server is still running." I tried (upgrade from postgres 10 to postgres 15): /usr/pgsql-15/bin/pg_upgrade -b /usr/pgsql-10/bin/ -B /usr/pgsql-15/bin -d /var/lib/pgsql/10/data -D /mnt/pgdata/pgdirbc15/ --link -c Log tells: ----------------------------------------------------------------- pg_upgrade run on Wed Sep 4 09:08:31 2024 ----------------------------------------------------------------- command: "/usr/pgsql-10/bin/pg_ctl" -w -l "/mnt/pgdata/pgdirbc15/pg_upgrade_output.d/20240904T090831.750/log/pg_upgrade_server.log" -D "/var/lib/pgsql/10/data" -o "-p 50432 -b -c listen_addresses='' -c unix_socket_permissions=0700 -c unix_socket_directories='/var/lib/pgsql'" start >> "/mnt/pgdata/pgdirbc15/pg_upgrade_output.d/20240904T090831.750/log/pg_upgrade_server.log" 2>&1 waiting for server to start....2024-09-04 12:08:32.179 CEST [12197] FATAL: lock file "postmaster.pid" already exists 2024-09-04 12:08:32.179 CEST [12197] HINT: Is another postmaster (PID 25407) running in data directory "/mnt/pgdata/pgdir"? stopped waiting pg_ctl: could not start server Examine the log output. I tried the without --link, same error. It seems pg_upgrade -c requires the old server to be stopped.
