ID: 13531 Title: mk_postgres: Fix Bug with password authentication method on Linux Component: Checks & agents Level: 1 Class: Bug fix Version: 2.1.0i1 For using password authentication, the Path to the pgpass file needs to be in the third argument of the INSTANCE Parameter in postgres.cfg: INSTANCE=/opt/cmk/etc/pgsql-12.env:checkmk:/var/lib/pgsql/12/data/.checkmk_pgpass In pg_hba.conf, password authentication needs to be set for the checkmk user: local all checkmk password With these setting, the current version of the Plugin asks for the password of the checkmk postgres user when it is executes manually. The PGPASSFILE is read correctly from the config, and it may work on Windows, but on Linux we are using "su -" to change to the postgres OS user and we are loosing all environment variables which are set to the Popen function via self.my_env. This change will add the PGPASSFILE correctly after switching the user. This is tested successfully on Linux with a PostgresSQL 12 DB. It will also cause no issue when not using the password authentication, since the variable is empty and is not used.