[SOLVED] docker - postgres upgrade 11 to 12 postmaster issue

docker - postgres upgrade 11 to 12 postmaster issue

I used this https://github.com/tianon/docker-postgres-upgrade to upgrade postgres from 11 to 12 version & facing issue while upgrade, got error - "postmaster servicing the old cluster"

Here using docker container for 11 & 12 in separately, also scale down docker service before that upgarde, but not sure why this postmaster issue came & how to fix this.??

docker run --rm \
    -v aip-pgs-data:/var/lib/postgresql/$OLD/data \
    -v aip-pg12-data:/var/lib/postgresql/$NEW/data \
    "tianon/postgres-upgrade:$OLD-to-$NEW"

Above docker run cmd part of logs:--

Success. You can now start the database server using:

    pg_ctl -D /var/lib/postgresql/12/data -l logfile start


There seems to be a postmaster servicing the old cluster.
Please shutdown that postmaster and try again.
Failure, exiting
0a5839ad7309d6256510fe89513774a16c4f26ec6a827f9f0089fd8cc10254cb

Thank you in advance.

Solution

I tried a longer stop_grace_period so that postgresql server will have enough time to stop everything when it receives the SIGTERM (postgresql.org/docs/11/server-shutdown.html). Then postgres stopped