Install the EPEL repository

Check available repositories
You can see if the repositories that you need are installed and enabled by running the following command:

yum repolist

Some repositories are disabled by default. To list disabled repositories, run the following command:

yum repolist disabled

You install the EPEL repository by downloading the appropriate RPM package for your system and installing it. The following instructions use the 64-bit packages that work with 64bit Servers instances.

CentOS and Red Hat Enterprise Linux 5.x
wget http://dl.fedoraproject.org/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm
rpm -Uvh epel-release-5*.rpm OR sudo rpm -Uvh epel-release-5*.rpm

CentOS and Red Hat Enterprise Linux 6.x
wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
rpm -Uvh epel-release-6*.rpm OR sudo rpm -Uvh epel-release-6*.rpm

CentOS and Red Hat Enterprise Linux 7.x
wget http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-1.noarch.rpm
rpm -Uvh epel-release-7*.rpm OR sudo rpm -Uvh epel-release-7*.rpm

Or you can try this depending on your distro

yum install epel-release