How to upgrade postgresql database from 10 to 12 without losing data for openproject

Question

My OpenProject management software is installed with default postgresql 10. Currently the postgresql DB is 12, It is having lot of new features.

I want to upgrade my Pos

Answer 1

Postgresql Upgrade using pg_upgrade

Step - 1 (Find the locale language and encoding of source Postgresql server)

• Log in to Postgresql database as postgres user
• Execute the query SHOW LC_COLLATE;

Step - 2 ( Stop the existing/source Postgresql server)

• Find the running Postgresql service using $ sudo systemctl list-units | grep postgres
• Stop the service $ sudo service postgresql-.service stop

Step - 3 (Install target Postgresql server)

• Configure repos and install (lot of tutorials available in google)

Step - 4 (Update the locale language and encoding)

$ /usr/pgsql-/bin/initdb -D /var/lib/pgsql//data --locale=

Step - 5 (Check the source to target upgrade has any potential issues)

• Run the command as postgres user, $sudo su postgres

  $  /usr/pgsql-/bin/pg_upgrade --old-bindir /usr/pgsql-/bin --new-bindir /usr/pgsql-/bin --old-datadir /var/lib/pgsql//data --new-datadir /var/lib/pgsql/12/data --link --jobs=2 --check

If it's ok we can move to the next step, If not fix the issues before proceeding to the next step Expected output: Clusters are compatible

Step - 6 (Upgrade the source to target Postgresql version using the link option)

• link option is pretty faster than the migration
• Run the command as postgres user, $sudo su postgres

    $ /usr/pgsql-/bin/pg_upgrade --old-bindir /usr/pgsql-/bin --new-bindir /usr/pgsql-/bin --old-datadir /var/lib/pgsql//data --new-datadir /var/lib/pgsql//data --link

Expected output: Upgrade Complete

Thanks. ENJOY !!!