一、说在前面

1、红帽的yum源要收费，作为技术人只能想点别的办法了，可以采用CentOS的yum源
2、根据阿里云的提示，CentOS 8操作系统版本结束了生命周期，阿里云镜像站也移除了相应镜像源。如果您的业务过渡期仍需要使用CentOS 8中的一些安装包，建议切换至CentOS-Vault源

二、前提

yum仓库在/etc/yum.repos.d中的.repo中，首先进入到这个目录下

[root@localhost ~]# cd /etc/yum.repos.d
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三、从阿里云获取

其实并不用备份，毕竟在原来的redhat.repo里面毛都没有

wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo
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[root@localhost yum.repos.d]# wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo
--2022-08-02 13:48:12--  https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo
正在解析主机 mirrors.aliyun.com (mirrors.aliyun.com)... 14.215.172.239, 14.215.172.241, 183.2.193.239, ...
正在连接 mirrors.aliyun.com (mirrors.aliyun.com)|14.215.172.239|:443... 已连接。
已发出 HTTP 请求，正在等待回应... 200 OK
长度：2495 (2.4K) [application/octet-stream]
正在保存至: “/etc/yum.repos.d/CentOS-Base.repo”

/etc/yum.repos.d/CentOS-Base.repo                    100%[=====================================================================================================================>]   2.44K  --.-KB/s  用时 0s      

2022-08-02 13:48:12 (82.2 MB/s) - 已保存 “/etc/yum.repos.d/CentOS-Base.repo” [2495/2495])

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然后得到的CentOS-Base.repo文件内容如下，不想下载的师傅可以直接复制然后粘到redhat.repo里面

# 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
baseurl=http://mirrors.aliyun.com/centos-vault/8.5.2111/BaseOS/$basearch/os/
        http://mirrors.aliyuncs.com/centos-vault/8.5.2111/BaseOS/$basearch/os/
        http://mirrors.cloud.aliyuncs.com/centos-vault/8.5.2111/BaseOS/$basearch/os/
gpgcheck=0
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-Official
 
#additional packages that may be useful
[extras]
name=CentOS-8.5.2111 - Extras - mirrors.aliyun.com
baseurl=http://mirrors.aliyun.com/centos-vault/8.5.2111/extras/$basearch/os/
        http://mirrors.aliyuncs.com/centos-vault/8.5.2111/extras/$basearch/os/
        http://mirrors.cloud.aliyuncs.com/centos-vault/8.5.2111/extras/$basearch/os/
gpgcheck=0
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-Official
 
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-8.5.2111 - Plus - mirrors.aliyun.com
baseurl=http://mirrors.aliyun.com/centos-vault/8.5.2111/centosplus/$basearch/os/
        http://mirrors.aliyuncs.com/centos-vault/8.5.2111/centosplus/$basearch/os/
        http://mirrors.cloud.aliyuncs.com/centos-vault/8.5.2111/centosplus/$basearch/os/
gpgcheck=0
enabled=0
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-Official
 
[PowerTools]
name=CentOS-8.5.2111 - PowerTools - mirrors.aliyun.com
baseurl=http://mirrors.aliyun.com/centos-vault/8.5.2111/PowerTools/$basearch/os/
        http://mirrors.aliyuncs.com/centos-vault/8.5.2111/PowerTools/$basearch/os/
        http://mirrors.cloud.aliyuncs.com/centos-vault/8.5.2111/PowerTools/$basearch/os/
gpgcheck=0
enabled=0
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-Official


[AppStream]
name=CentOS-8.5.2111 - AppStream - mirrors.aliyun.com
baseurl=http://mirrors.aliyun.com/centos-vault/8.5.2111/AppStream/$basearch/os/
        http://mirrors.aliyuncs.com/centos-vault/8.5.2111/AppStream/$basearch/os/
        http://mirrors.cloud.aliyuncs.com/centos-vault/8.5.2111/AppStream/$basearch/os/
gpgcheck=0
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-Official
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四、清除缓存

yum clean all
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[root@localhost yum.repos.d]# yum clean all
Updating Subscription Management repositories.
Unable to read consumer identity
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
17 文件已删除
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五、查看yum仓库

yum repolist
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[root@localhost yum.repos.d]# yum repolist 
Updating Subscription Management repositories.
Unable to read consumer identity
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
仓库标识                                                仓库名称
AppStream                                               CentOS-8.5.2111 - AppStream - mirrors.aliyun.com
base                                                    CentOS-8.5.2111 - Base - mirrors.aliyun.com
extras                                                  CentOS-8.5.2111 - Extras - mirrors.aliyun.com
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六、生成缓存

yum makecache
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[root@localhost yum.repos.d]# yum makecache 
Updating Subscription Management repositories.
Unable to read consumer identity
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
CentOS-8.5.2111 - Base - mirrors.aliyun.com                                                                                                                                        384 kB/s | 4.6 MB     00:12    
CentOS-8.5.2111 - Extras - mirrors.aliyun.com                                                                                                                                       30 kB/s |  10 kB     00:00    
CentOS-8.5.2111 - AppStream - mirrors.aliyun.com                                                                                                                                   352 kB/s | 8.4 MB     00:24    
元数据缓存已建立。
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这个时候就可以开始正常使用yum源了