I am trying to determine how to get postgres to use a custom postgresql.conf file that will be located in a directory other than the default postgresql.conf file. I would like it to be installed via an rc script so that the database setup can be part of a self-contained install. I do not want to use symbolic links, and I do not want to edit the default postgresql.conf file. I am using PostgreSQL version 8.4.4 on Red Hat Enterprise Linux 6. Currently, I am able to start the database using the following command, which specifies my custom postgresql.conf file: