[root@localhost ~]# yum install vim
已加载插件：fastestmirror
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
14: curl#7 - "Failed to connect to 2600:1f16:c1:5e01:4180:6610:5482:c1c0: 网络不可达"

在CentOS7的阿里云服务器上遇到curl和DNS解析错误，导致无法连接到网络更新。通过删除yum.repos.d目录并重新安装阿里云镜像，然后清理缓存和更新解决了问题。尝试过的方法包括修改DNS、打开ONBOOK、处理epel-release问题以及卸载重装yum。

错误
14: curl#7 - “Failed to connect to 2: Network is unreachable”
[Errno 14] curl#6 - “Could not resolve host: mirrors.cloud.aliyuncs.com; Unknown error”

系统：CentOS7

服务器：阿里云服务器

最终解决方法

1. 这里有太多*.repo了，把这个文件夹删了重装（最后没办法了才这样，误打误撞居然解决了）

rm -rf /etc/yum.repos.d
mkdir /etc/yum.repos.d

2. 找到阿里云镜像，下载repo

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

3. 清理yum缓存，重新安装

yum clean all
yum makecache
yum update

泪目，终于通了。

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