1.更改yum源配置
# 备份
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
mv /etc/yum.repos.d/epel.repo /etc/yum.repos.d/epel.repo.bak
# 下载新repo,并重命名为CentOS-Base.repo,也可以用wget命令下载
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
2.清除yum缓存
yum clean all
3. 更新
yum update
4.查看版本(若没变,可以重启reboot,再查看版本)
cat /etc/redhat-release
参考链接:https://blog.csdn.net/liangpingguo/article/details/107933094