1.查看系统的版本
cat /etc/redhat-release
2.安装依赖包
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
3.更新镜像仓库
cd /etc/yum.repos.d
wget http://mirrors.163.com/.help/CentOS6-Base-163.repo
等同 yum-config-manager --add-repo http://mirrors.163.com/.help/CentOS6-Base-163.repo
然后将其他所有的repo文件改为备份文件,
yum clean all
yum makecache
yum update