Acesse o terminal SSH e siga os passos:

Instalando no CentOS 5:

## CentOS 5 32bit ##
wget http://download.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm
rpm -ivh epel-release-5-4.noarch.rpm

## CentOS 5 64bit ##
wget http://download.fedoraproject.org/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm
rpm -ivh epel-release-5-4.noarch.rpm

Instalando no CentOS 6:

## CentOS 6 32bit ##
wget http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
sudo rpm -ivh epel-release-6-8.noarch.rpm

## CentOS 6 64bit ##
wget http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
sudo rpm -ivh epel-release-6-8.noarch.rpm

Instalando no CentOS 7:

wget http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm
sudo rpm -Uvh epel-release-7-5.noarch.rpm

Para ativar ou desativar o repositório edite o arquivo “/etc/yum.repos.d/epel.repo” e altere a linha “enabled”:

Para ativar:

enabled=1

Para desativar:

enabled=0