CentOS7 yum命令无法使用解决办法

使用yum 提示：

Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
There are no enabled repos.
 Run "yum repolist all" to see the repos you have.
 To enable Red Hat Subscription Management repositories:
     subscription-manager repos --enable <repo>
 To enable custom repositories:
     yum-config-manager --enable <repo>

ping 命令正常，网络没有问题。

解决步骤
1、更换yum源

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

2、更新yum

yum -y install yum-utils
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