在执行yum时报错：Loaded plugins: fastestmirrorYou have enabled checking of packages via GPG keys. This is a good thing.However, you do not have any GPG public keys installed. You need to downloadthe keys for packages you wish to install and install them.You can do that by running the command:rpm --import public.gpg.keyAlternatively you can specify the url to the key you would like to usefor a repository in the 'gpgkey' option in a repository section and yumwill install it for you.For more information contact your distribution or package provider.Problem repository: centos
这是由于系统检测不到GPG公钥
只需输入：
rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
再次运行发现错误解决了
