1.备份本地源
1 # mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo_bak
2.获取阿里yum源配置
1 # wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
3.更新缓存
1 # yum clean all
2 # yum makecache
4.更新软件包
1 # yum -y update
2 # yum -y upgrad