参考：
https://jingyan.baidu.com/article/f0062228fff083bad2f0c873.html
https://www.cnblogs.com/heqiuyu/p/14268937.html
上面从 http://mirrors.aliyun.com/repo/Centos-8.repo 下载的文件并不能直接使用，需要根据需要做如下修改：
- 查看当前centos版本
cat /etc/redhat-release CentOS Linux release 8.5.2111
当前的版本时8.5.2111，然后看https://mirrors.aliyun.com/centos-vault/ 有没有对应的版本：
然后修改Centos-8.repo：
# CentOS-Base.repo # # The mirror system uses the connecting IP address of the client and the # update status of each mirror to pick mirrors that are updated to and # geographically close to the client. You should use this for CentOS updates # unless you are manually picking other mirrors. # # If the mirrorlist= does not work for you, as a fall back you can try the # remarked out baseurl= line instead. # # [base] name=CentOS-8.5.2111 - Base - mirrors.aliyun.com #failovermethod=priority baseurl=https://mirrors.aliyun.com/centos-vault/8.5.2111/BaseOS/$basearch/os/ gpgcheck=1 gpgkey=https://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-Official #additional packages that may be useful [extras] name=CentOS-8.5.2111 - Extras - mirrors.aliyun.com #failovermethod=priority baseurl=https://mirrors.aliyun.com/centos-vault/8.5.2111/extras/$basearch/os/ gpgcheck=1 gpgkey=https://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-Official #additional packages that extend functionality of existing packages [centosplus] name=CentOS-8.5.2111 - Plus - mirrors.aliyun.com #failovermethod=priority baseurl=https://mirrors.aliyun.com/centos-vault/8.5.2111/centosplus/$basearch/os/ gpgcheck=1 enabled=0 gpgkey=https://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-Official [PowerTools] name=CentOS-8.5.2111 - PowerTools - mirrors.aliyun.com #failovermethod=priority baseurl=https://mirrors.aliyun.com/centos-vault/8.5.2111/PowerTools/$basearch/os/ gpgcheck=1 enabled=0 gpgkey=https://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-Official [AppStream] name=CentOS-8.5.2111 - AppStream - mirrors.aliyun.com #failovermethod=priority baseurl=https://mirrors.aliyun.com/centos-vault/8.5.2111/AppStream/$basearch/os/ gpgcheck=1 gpgkey=https://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-Official [debuginfo] name=CentOS Linux $releasever - Debuginfo baseurl=http://mirrors.aliyun.com/centos-debuginfo/$releasever/$basearch/ gpgcheck=1 enabled=1 gpgkey=https://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-Official
或者改成如下：
# CentOS-Base.repo # # The mirror system uses the connecting IP address of the client and the # update status of each mirror to pick mirrors that are updated to and # geographically close to the client. You should use this for CentOS updates # unless you are manually picking other mirrors. # # If the mirrorlist= does not work for you, as a fall back you can try the # remarked out baseurl= line instead. # # [base] name=CentOS-centos/$releasever - Base - mirrors.aliyun.com #failovermethod=priority baseurl=https://mirrors.aliyun.com/centos-vault/centos/$releasever/BaseOS/$basearch/os/ gpgcheck=1 gpgkey=https://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-Official #additional packages that may be useful [extras] name=CentOS-centos/$releasever - Extras - mirrors.aliyun.com #failovermethod=priority baseurl=https://mirrors.aliyun.com/centos-vault/centos/$releasever/extras/$basearch/os/ gpgcheck=1 gpgkey=https://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-Official #additional packages that extend functionality of existing packages [centosplus] name=CentOS-centos/$releasever - Plus - mirrors.aliyun.com #failovermethod=priority baseurl=https://mirrors.aliyun.com/centos-vault/centos/$releasever/centosplus/$basearch/os/ gpgcheck=1 enabled=0 gpgkey=https://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-Official [PowerTools] name=CentOS-centos/$releasever - PowerTools - mirrors.aliyun.com #failovermethod=priority baseurl=https://mirrors.aliyun.com/centos-vault/centos/$releasever/PowerTools/$basearch/os/ gpgcheck=1 enabled=0 gpgkey=https://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-Official [AppStream] name=CentOS-centos/$releasever - AppStream - mirrors.aliyun.com #failovermethod=priority baseurl=https://mirrors.aliyun.com/centos-vault/centos/$releasever/AppStream/$basearch/os/ gpgcheck=1 gpgkey=https://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-Official [debuginfo] name=CentOS Linux $releasever - Debuginfo baseurl=http://mirrors.aliyun.com/centos-debuginfo/$releasever/$basearch/ gpgcheck=1 enabled=1 gpgkey=https://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-Official
