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https://blog.csdn.net/wh211212/article/details/52936814
1、前提
由于redhat系统不再期官网注册，系统安装完成之后无法正常使用期yun源，因此更改redhat的yum源为CentOS的源
系统环境
[root@docker01 ~]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.8 (Maipo)
2、删除redhat自带的yum源
[root@docker01 ~]# rpm -aq|grep yum|xargs rpm -e --nodeps
警告：/etc/yum/pluginconf.d/langpacks.conf 已另存为 /etc/yum/pluginconf.d/langpacks.conf.rpmsave
3、从阿里云下载yum相关安装包
wget http://mirrors.aliyun.com/centos/7.8.2003/os/x86_64/Packages/yum-3.4.3-167.el7.centos.noarch.rpm
wget http://mirrors.aliyun.com/centos/7.8.2003/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
wget http://mirrors.aliyun.com/centos/7.8.2003/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-53.el7.noarch.rpm
4、rpm安装下载的yum包，按顺序执行下面命令
rpm -ivh yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
rpm -ivh yum-3.4.3-167.el7.centos.noarch.rpm yum-plugin-fastestmirror-1.1.31-53.el7.noarch.rpm
5、创建文件/etc/yum.repos.d/aliyun.repo并写入
vim /etc/yum.repos.d/aliyun.repo
[base]
name=CentOS-$releasever - Base
baseurl=http://mirrors.aliyun.com/centos/7.8.2003/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/7.8.2003/os/x86_64/RPM-GPG-KEY-CentOS-7
#released updates
[updates]
name=CentOS-$releasever - Updates
baseurl=http://mirrors.aliyun.com/centos/7.8.2003/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/7.8.2003/os/x86_64/RPM-GPG-KEY-CentOS-7
[extras]
name=CentOS-$releasever - Extras
baseurl=http://mirrors.aliyun.com/centos/7.8.2003/extras//$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/7.8.2003/os/x86_64/RPM-GPG-KEY-CentOS-7
[centosplus]
name=CentOS-$releasever - Plus
baseurl=http://mirrors.aliyun.com/centos/7.8.2003/centosplus//$basearch/
gpgcheck=1
enabled=0
6、创建aliyun前记得把redhat自带的源一走或者删除
yum clean all && yum makecache
7、测试源
yum update -y --skip-broken
能看到已经能够成功的通过yum安装相关软件包
如果报错：
wget http://mirrors.aliyun.com/centos/7.8.2003/os/x86_64/RPM-GPG-KEY-CentOS-7
rpm –import RPM-GPG-KEY-CentOS-7
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