Loaded plugins: fastestmirror, ovl
Determining fastest mirrors
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=container error was
14: curl#6 - “Could not resolve host: mirrorlist.centos.org; Unknown error”
解决办法：
vi /etc/yum/pluginconf.d/fastestmirror.conf
plugins=0
vi /etc/yum.conf
enabled=0
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
yum clean all
yum update
