报错原因

系统中未启用 RHEL/CentOS 7.x/6.x/5.x 的 EPEL 存储库。
　　EPEL 代表企业 Linux 及其在线分布式的额外软件包，可以由 yum 程序自动下载和安装。
　　只要启用了此选项，错误就会解决

CentOS7–解决方式

如果没有安装 wget 需要先 yum install wget

wget http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
rpm -ivh epel-release-latest-7.noarch.rpm

CentOS6–解决方式

# 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