出处：https://blog.csdn/Robin_star_/article/details/97790511

个人分析原因：yum源找不到该包，报错，需要更新源

一、官方安装教程

RHEL/CentOS 6:
yum install https://dl.fedoraproject/pub/epel/epel-release-latest-6.noarch.rpm
RHEL/CentOS 7:
yum install https://dl.fedoraproject/pub/epel/epel-release-latest-7.noarch.rpm

二、配置 EPEL 阿里源

1、备份(如有配置其他epel源)

mv /etc/yum.repos.d/epel.repo /etc/yum.repos.d/epel.repo.backup
mv /etc/yum.repos.d/epel-testing.repo /etc/yum.repos.d/epel-testing.repo.backup

2、下载新repo 到/etc/yum.repos.d/

epel(RHEL 7)
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun/repo/epel-7.repo

epel(RHEL 6)
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun/repo/epel-6.repo

epel(RHEL 5)
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun/repo/epel-5.repo

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No package XXX available. Error: Nothing to do