- 网速要有保证
- 清缓存
#yum clean all
#yum makecache
#yum update -y //升级软件和内核 - 添加阿里云DNS
DNS3=223.5.5.5 - 更换reop源
yum安装会从三个reop源(base、extras、updates)随机获取地址;
#mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
#yum -y install wget
#wget -O /etc/yum. repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
#yum clean all
#yum makecache