Centos更换yum源

1.检测网络

ping baidu.com

2.更新yum源

cd /etc/yum.repos.d/
mkdir repos
mv -rf * repos/
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo  #根据自己系统版本
yum update
yum clean all
yum makecache

3.软件安装报错

类似于Error: Cannot find a valid baseurl for repo: base 或者 Not found 404
参考这个帖子：https://blog.csdn.net/weixin_42272246/article/details/111316339?spm=1001.2014.3001.5506