red hat yum源This system is not registered to Red Hat Subscription Management问题

参考链接https://www.cnblogs.com/wdjsbk/p/9629931.html

换yum源后，仍然是未注册，尝试了这个后配好的

配置阿里云yum源 

1.备份你的原镜像文件，以免出错后可以恢复   

  mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

2.下载新的CentOS-Base.repo 到/etc/yum.repos.d/

    wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

3.我们需要进入CentOS-Base.repo文件   vi   CentOS-Base.repo

  修改文件中的baseurl地址

修改前：

修改后：

方便复制：

baseurl=http://mirrors.aliyun.com/centos/7/os/x86_64/

http://mirrors.aliyuncs.com/centos/7/os/x86_64/

http://mirrors.cloud.aliyuncs.com/centos/7/os/x86_64/

 

baseurl=http://mirrors.aliyun.com/centos/7/updates/x86_64/

http://mirrors.aliyuncs.com/centos/7/updates/x86_64/

http://mirrors.cloud.aliyuncs.com/centos/7/updates/x86_64/

 

baseurl=http://mirrors.aliyun.com/centos/7/extras/x86_ 64/

http: //mirrors.aliyuncs.com/centos/7/extras/x86_ 64/

http: //mirrors.cloud.aliyuncs.com/centos/7/extras/x86_ 64/

baseurl=http://mirrors.aliyun.com/centos/7/centosplus/x86_ 64/

http: //mirrors.aliyuncs.com/centos/7/centosplus/x86_ 64/

http: //mirrors.cloud.aliyuncs.com/centos/7/centosplus/x86_ 64/

baseurl=http: //mirrors.aliyun.com/ centos/7/contrib/ x86_64/

http: //mirrors.aliyuncs.com/centos/7/contrib/x86_64/

http: //mirrors.cloud. aliyuncs.com/centos/7/contrib/x86_ 64/

4.清楚原有yum缓存   yum clean all

5.生成缓存yum makecache

然后就可以了