Re: How to make superuser from non superuser in PostgreSQL

You will need to figure out a way to login as the (an?) existing superuser.  Typically a password is not required since the pg_hba.conf file usually has a “local postgres postgres peer” (or equivalent) entry which lets the DBA become the OS postgres (or whatever user owns the service) user and then just connect to the cluster using the postgres role.  Regardless, your ability to becomes superuser depends at this point on being able to become the OS user that owns the PostgreSQL service so you can modify pg_hba.conf to let you login.

David J.