centos7 yum install ambari-server 报错_for more information contact your distribution or

问题：

Loaded plugins: fastestmirror, langpacks
Repository 'centos-yum' is missing name in configuration, using id

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.

Problem repository: HDP-UTILS-1.1.0.21

解决：

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