1、查看當(dāng)前yum源
sudo yum repolist
2浓若、備份原始yum源
cd /etc/yum.repos.d
cp CentOS-Base.repo CentOS-Base.repo-20220705.bak
3、配置CentOS的DNS：
vim /etc/resolv.conf
nameserver 114.114.114.114 //國內(nèi)dns
nameserver 8.8.8.8 //國外dns
4蛇数、下載yum文件挪钓，替代原始yum源：
(1)網(wǎng)易yum源：
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS7-Base-163.repo
yum clean all //清除緩存
yum makecache //生成緩存
解析:wget -o,使用“-o”參數(shù)來指定一個文件名
(2)阿里云yum源：
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
yum clean all
yum makecache
此處可作為參考
https://developer.aliyun.com/mirror/
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