更新yum源

1. 备份本地源

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

 

2. 下载阿里源

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

 

3. 更新缓存

yum makecache

4. 升级软件

yum -y update