#导入gpg key
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
#在/etc/yum.repos.d/下安装elrepo.repo 文件
yum install https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm

编辑 /etc/yum.repos.d/elrepo.repo 文件，在 mirrorlist= 开头的行前面加 # 注释掉；并将 elrepo.org/linux 替换为 mirrors.tuna.tsinghua.edu.cn/elrepo

最后，更新软件包缓存

yum makecache

 

EPEL(Extra Packages for Enterprise Linux)是由Fedora Special Interest Group维护的Enterprise Linux（RHEL、CentOS）中经 常用到的包。

touch /etc/yum.repos.d/epel.repo

编辑文件/etc/yum.repos.d/epel.repo，内容如下：

[epel]
name=Extra Packages for Enterprise Linux 7 - $basearch
baseurl=https://mirrors.tuna.tsinghua.edu.cn/epel/7/$basearch
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=$basearch
failovermethod=priority
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7

[epel-debuginfo]
name=Extra Packages for Enterprise Linux 7 - $basearch - Debug
baseurl=https://mirrors.tuna.tsinghua.edu.cn/epel/7/$basearch/debug
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-debug-7&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=1

[epel-source]
name=Extra Packages for Enterprise Linux 7 - $basearch - Source
baseurl=https://mirrors.tuna.tsinghua.edu.cn/epel/7/SRPMS
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-source-7&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=1

保存，退出。

最后，yum makecache