1. Yum Install Required Dependencies :: -- Note - names may change slightly between different OS versions, which can be determined by 'yum search package-name' postgresql postgresql-server unixODBC perl authd AND postgresql-odbc (could also be postgresqlXX-odbc) - also needs to be installed, but this is not declared in the RPM due to issues with versioning resolution 2. Start Postgres Server and Initialize Database Tables :: sudo /sbin/service postgresql start OR sudo /sbin/service postgresql-9.0 initdb sudo /sbin/service postgresql-9.0 start 3. Modify authd config file for xinet.d :: vim /etc/xinetd.d/auth Remove the '-E' command line argument for auth :: changing : [ server_args = -t60 --xerror --os -E ] to : [ server_args = -t60 --xerror --os ] 4. Set the proper runlevel for authd :: sudo /sbin/chkconfig --level=3 auth on 5. Restart xinetd sudo /etc/init.d/xinetd restart 6. Install the E-iRODS RPM :: rpm -i e-irods-XXX.rpm