更換系統默認yum 源
更換yum源為阿里云yum源
備份系統默認的yum源
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
下載阿里云yum源
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
添加 epel 源
yum -y install epel-release.noarch
常用的yum源
epel源:https://fedoraproject.org/wiki/EPEL
repoforge源:http://repoforge.org/use/
清理緩存
yum clean all
生成新的緩存
yum makecache