How to add EPEL Repository in CentOS/RHEL

What is EPEL ?

EPEL (Extra Packages for Enterprise Linux) is a volunteer-based community effort from the Fedora project to create a repository of high-quality add-on packages that complement the Fedora-based Red Hat Enterprise Linux (RHEL) and its compatible spinoffs, such as CentOS and Scientific Linux.

As part of the Fedora packaging community, EPEL packages are 100% free/libre open source software (FLOSS).

Is EPEL commercially supported by Red Hat?

No. EPEL is a volunteer effort from the Fedora community. Just like Fedora itself, Red Hat hosts infrastructure for this project and Red Hat engineers are involved as maintainers and leaders but there are no commercial support contracts or service level agreements provided by Red Hat for packages in EPEL.

How is EPEL different from other third party repositories for RHEL and derivatives?

•  EPEL packages are in most cases built or derived from the equivalent ones in Fedora repository and maintained by the same people. It has also been improved through peer reviews, testing and feedback from end users.
• EPEL adheres to the well documented Fedora Packaging guidelines , which RHEL has started following. This ensures good integration.
• EPEL is purely a complementary add-on repository and does not replace packages in RHEL or layered products.
• EPEL has a large team of contributors including Red Hat engineers and volunteer community members working together to maintain the repository.
• EPEL only provides free and open source software unencumbered by patents or any legal issues.

See also CentOS FAQ on alternate repositories.

How to Install EPEL Repository in RHEL/CentOS ?

CentOS/RHEL 7.x

rpm -ivh http://mirror.omnilance.com/epel/beta/7/$(arch)/epel-release-7-0.2.noarch.rpm

CentOS/RHEL 6.x

rpm -ivh http://download.fedoraproject.org/pub/epel/6/$(arch)/epel-release-6-8.noarch.rpm

CentOS/RHEL 5.x

rpm -ivh http://download.fedoraproject.org/pub/epel/5/$(arch)/epel-release-5-4.noarch.rpm

CentOS/RHEL 4.x

rpm -ivh http://download.fedoraproject.org/pub/epel/4/$(arch)/epel-release-4-10.noarch.rpm

Just Paste it in your terminal server and update.

yum update -y

Thanks.

Source : 

fedoraproject.org

http://www.shellhacks.com/en/Adding-EPEL-Repository-on-CentOS-RHEL