Installing EPEL repository on a CentOS Linux and RHEL 7.x

 https://www.cyberciti.biz/faq/installing-rhel-epel-repo-on-centos-redhat-7-x/

The procedure to enable EPEL repository for a CentOS/RHEL 7.x server is as follows:

1. Open a shell prompt.
2. Or login to a host called server1 using ssh client.
3. Install epel repository using: yum -y install epel-release
4. Refresh epel repo by typing: yum repolist
5. Install packages from epel repo : yum install pkg1