Install EPEL、REMI and Rpmforge repo on CentOS 6

1. 取得 epel rpm：
wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm

2. 取得 remi rpm and key：
wget http://rpms.famillecollet.com/enterprise/remi-release-6.rpm

wget http://rpms.famillecollet.com/RPM-GPG-KEY-remi

3. 取得 rpmforge rpm and key：
wget http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm

wget http://apt.sw.be/RPM-GPG-KEY.dag.txt

5. 安裝：
sudo rpm -Uvh remi-release-6*.rpm epel-release-6*.rpm rpmforge-release-0.5.3-1*.rpm

6. 安裝 remi and rpmforge key
sudo rpm --import RPM-GPG-KEY-remi

sudo rpm --import RPM-GPG-KEY.dag.txt