You can using the pg_hba.conf file. Set the non-local accounts to reject when you start the database. After you finish your scripts, change the pg_hba.conf file to enable logins and then use pg_ctl reload to enable the new pg_hba.conf file.
host all all 0.0.0.0/0 reject
And then change it to:
host all all 0.0.0.0/0 md5
Jon
From: pgsql-general-owner@postgresql.org [mailto:pgsql-general-owner@postgresql.org] On Behalf Of Teemu Juntunen
Sent: Monday, August 04, 2008 12:20 PM
To: PostgreSQL
Subject: [GENERAL] Howto disable login?
is there some way to disable and enable login in PostgreSQL? I would like to have only local login enabled when the server starts and make some checks before allowing general login.