PostgreSQL and CentOS Install example

List what is available in the enabled repositories on your CentOS Install:
yum info postgresql-server.x86_64 | grep Version
Select a newer version form http://yum.postgresql.org/
yum install http://yum.postgresql.org/9.3/redhat/rhel-7-x86_64/pgdg-centos93-9.3-1.noarch.rpm
# if you are using priorities add some to /etc/yum.repos.d/pgdg-93-centos.repo
yum install postgresql93-contrib
service postgresql-9.3 initdb
service postgresql-9.3 start
Directories of interest are:
conf /var/lib/pgsql/9.3/data/
data /var/lib/pgsql/9.3/data/base/