進入yum.repos.d文件夾
cd /etc/yum.repos.d/
mv CentOS-Base.repo CentOS-Base.repo.backup
下載yum源
wget http://mirrors.163.com/.help/CentOS7-Base-163.repo
wget http://mirrors.aliyun.com/repo/Centos-7.repo
yum clean all 清除系統yum 緩存
yum makecache 生成yum緩存
如果yum報錯 進程被占用
rm -f /var/run/yum.pid