What is EPEL
EPEL (Extra Packages for Enterprise Linux) is open source and free community based repository project from Fedora team which provides 100% high quality add-on software packages for Linux distribution including RHEL (Red Hat Enterprise Linux), CentOS, and Scientific Linux. Epel project is not a part of RHEL/Cent OS but it is designed for major Linux distributions by providing lots of open source packages like networking, sys admin, programming, monitoring and so on. Most of the epel packages are maintained by Fedora repo.
Why we use EPEL repository?
- Provides lots of open source packages to install via Yum.
- Epel repo is 100% open source and free to use.
- It does not provide any core duplicate packages and no compatibility issues.
- All epel packages are maintained by Fedora repo.
RHEL/CentOS 7 64 Bit
## RHEL/CentOS 7 64-Bit ##
wget http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
rpm -ivh epel-release-latest-7.noarch.rpm
RHEL/CentOS 6 32-64 Bit
## RHEL/CentOS 6 32-Bit ##
wget http://dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
rpm -ivh epel-release-6-8.noarch.rpm
## RHEL/CentOS 6 64-Bit ##
wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
rpm -ivh epel-release-6-8.noarch.rpm
来源：https://www.tecmint.com/how-to-enable-epel-repository-for-rhel-centos-6-5/