Rudder

The path to psql conf file should be:
/var/lib/pgsql/data/pg_hba.conf

Did it was on centos6? It should use psql 8.4, did you use an external package??

Where the conf file path is determined is here:
https://github.com/Normation/rudder-packages/blob/master/rudder-reports/SPECS/rudder-reports.spec

Here a page listing all path about psql path
https://wiki.postgresql.org/wiki/YUM_Installation

It was on Centos6, and Postgres 9.1

the path to the postgres was /var/lib/pgsql/9.1/data (but you know that, given the link you pasted)

Here I found how to ask postgres where is located its conf file: http://askubuntu.com/questions/256534/how-do-i-find-the-path-to-pg-hba-conf-from-the-shell

sum up (with PGUSER set, need to try with "su postgres -c"):

psql -t -P format=unaligned -c 'show hba_file';

Applied in changeset rudder-packages|995cc454ca0d3aed1062150d825ec7851a7542bb.