CentOS7不能yum解决方法

CentOS7，系统装好之后，不能yum。

报出来的信息如下：

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You 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 download

the keys for packages you wish to install and install them.

You can do that by running the command:

rpm --import public.gpg.key

Alternatively you can specify the url to the key you would like to use

for a repository in the 'gpgkey' option in a repository section and yum

will install it for you.

For more information contact your distribution or package provider.

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【解决方案】

# rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7