Hi I was doing a test upgrade from 9.5 to 9.6 and the following lines caught my eye postgres 10967 10911 0 15:59 pts/0 00:00:00 /usr/pgsql-9.6/bin/pg_upgrade -d /var/lib/pgsql/9.5/data -D /var/lib/pgsql/9.6/data -b /usr/pgsql-9.5/bin -B /usr/pgsql-9.6/bin -k -v postgres 11141 1 0 16:00 pts/0 00:00:00 /usr/pgsql-9.6/bin/postgres -D /var/lib/pgsql/9.6/data -p 50432 -b -c synchronous_commit=off -c fsync=off -c full_page_writes=off -c listen_addresses= -c unix_socket_permissions=0700 -c unix_so postgres 11160 10967 0 16:00 pts/0 00:00:00 sh -c "/usr/pgsql-9.6/bin/pg_restore" --host '/var/lib/pgsql' --port 50432 --username 'postgres' --exit-on-error --verbose --dbname 'dbname=birstdb' "pg_upgrade_dump_25288.custom" >> "pg_upgrad postgres 11161 11160 6 16:00 pts/0 00:00:00 /usr/pgsql-9.6/bin/pg_restore --host /var/lib/pgsql --port 50432 --username postgres --exit-on-error --verbose --dbname dbname=birstdb pg_upgrade_dump_25288.custom sudo grep -i port /var/lib/pgsql/9.6/data/postgresql.conf [sudo] password for armandp: port = 5432# (change requires restart) # supported by the operating system: Is it something that I missed or is it intentionally using a non default port to avoid unintended client connections ?
"Obviously, no one should be accessing the clusters during the upgrade. pg_upgrade defaults to running servers on port 50432 to avoid unintended client connections. You can use the same port number for both clusters when doing an upgrade because the old and new clusters will not be running at the same time. However, when checking an old running server, the old and new port numbers must be different."