截至2023年4月11日，目前CentOS系列除CentOS 7以外，其它版本的CentOS官方yum源都已经下线，因此会出现系统自带的yum源失效导致无法下载的问题。其它版本的CentOS只能更换yum源。
目录
查看yum源
//查看已经安装好的yum源仓库
yum repolist更换CentOS 8 yum源
备份旧yum源
//备份系统旧配置文件
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup下载yum源(下面的yum源只要下载其中一个就行)
//阿里云yum源
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo
//腾讯云yum源
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.cloud.tencent.com/repo/centos8_base.repo
//华为云yum源
wget -O /etc/yum.repos.d/CentOS-Base.repo https://repo.huaweicloud.com/repository/conf/CentOS-8-reg.repo更新缓存
//清除原有yum缓存
yum clean all
//刷新缓存
yum makecache更换CentOS 7 yum源
备份旧yum源
//备份系统旧配置文件
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup下载yum源(下面的yum源只要下载其中一个就行)
//阿里云yum源
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
//腾讯云yum源
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.cloud.tencent.com/repo/centos7_base.repo
//华为云yum源
wget -O /etc/yum.repos.d/CentOS-Base.repo https://repo.huaweicloud.com/repository/conf/CentOS-7-reg.repo
//网易云yum源
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS7-Base-163.repo更新缓存
//清除原有yum缓存
yum clean all
//刷新缓存
yum makecache更换CentOS 6 yum源
备份旧yum源
//备份系统旧配置文件
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup下载yum源(下面的yum源只要下载其中一个就行)
//阿里云yum源
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-6.10.repo
//腾讯云yum源
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.cloud.tencent.com/repo/centos6_base.repo
//网易云yum源
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS6-Base-163.repo更新缓存
//清除原有yum缓存
yum clean all
//刷新缓存
yum makecache更换CentOS 5 yum源
备份旧yum源
//备份系统旧配置文件
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup下载yum源(下面的yum源只要下载其中一个就行)
//腾讯云yum源
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.cloud.tencent.com/repo/centos5_base.repo
//网易云yum源
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS5-Base-163.repo更新缓存
//清除原有yum缓存
yum clean all
//刷新缓存
yum makecache镜像站yum源链接
阿里云
https://developer.aliyun.com/mirror/centos
腾讯云https://mirrors.cloud.tencent.com/help/centos.html