Linux中yum错误：Loaded plugins: fastestmirror, langpacksLoading mirror speeds from cached hostfileCoul

报错如下：

 

运行yum makecache依然报错！

猜测就是yum有问题了，找了几个小时终于找到一个正确的解决办法：

① 依次执行如下命令

sed -i s/mirror.centos.org/vault.centos.org/g /etc/yum.repos.d/*.repo
sed -i s/^#.*baseurl=http/baseurl=http/g /etc/yum.repos.d/*.repo
sed -i s/^mirrorlist=http/#mirrorlist=http/g /etc/yum.repos.d/*.repo
 
sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*

② 更换yum镜像源为阿里云

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

③ 清空yum缓存，重新执行yum makecache命令即可

yum clean all
yum makecache

然后我运行我要运行的命令成功了

Docker安装

• 下载Docker依赖的组件

yum -y install yum-utils device-mapper-persistent-data lvm2