Installing Postgresql 9.0 in Centos 6

Installing Postgresql 9.0 in Centos 6 is done in few easy steps.

First, download the Postgresql 9.0 RPM package:
wget http://yum.pgrpms.org/9.0/redhat/rhel-6-x86_64/pgdg-centos90-9.0-5.noarch.rpm

Install the package:
rpm -i pgdg-centos90-9.0-5.noarch.rpm

To avoid conflict with older postgresql packages existing in the Centos distribution, you must tell yum to exclude these in the installation. You must edit the CentOS-Base.repo file:
vi /etc/yum.repos.d/CentOS-Base.repo

Add this line at the [base] section:
exclude=postgresql*

Verify that the new package is active:
yum list

Then yum install postgres:
yum install postgresql90 postgresql90-devel postgresql90-server postgresql90-libs

Initialize postgresql:
service postgresql-9.0 initdb

Then start postgresql:
service postgresql-9.0 start

You are done with the installation.

The configuration that I you still need to do is to is edit the postgresql.conf file located in /var/lib/pgsql/9.0/data/ Be sure to add this line in the config:
listen_addresses = '*'

To enable remote access, I added this to the pg_hba.conf located in the same directory:
host all all 110.93.88.91 255.255.255.255 md5