Censot7 使用 yum 报错：Could not resolve host: mirrorlist.centos.org

解决方案：替换成阿里的镜像地址。

1：先备份

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

2：新建一个文件

touch /etc/yum.repos.d/CentOS-Base.repo

3：在新文件里写入以下内容

[base]
name=CentOS-$releasever
enabled=1
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

[updates]
name=CentOS-$releasever
enabled=1
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

[extras]
name=CentOS-$releasever
enabled=1
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

原文地址：https://blog.csdn.net/qq_36176250/article/details/140569089

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