切换国内源

cd /etc/yum.repo.d/

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

yum update

安装EPEL仓库

yum -y install epel-release

安装IUS仓库

rpm -Uvh https://centos7.iuscommunity.org/ius-release.rpm

安装REMI仓库

rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-7.rpm

查看yum软件仓库列表

yum repolist

生成缓存

yum clean all
yum makecache