warning: rpmts_HdrFromFdno: Header V3 RSA/SHA1 Signature, key ID 4520afa9: NOKEY

Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY.art.txt

The GPG keys listed for the "CentOS / Red Hat Enterprise Linux 6 - atomicrocketturtle.com" repository are

already installed but they are not correct for this package.

Check that the correct key URLs are configured for this repository.

在执行 yum install nginx 后出现上面的错误，然后nginx无法安装，先是

rpm --import /etc/pki/rpm-gpg/RPM* ，但是错误仍然存在，最后终于找到解决办法

yum update atomic-release

原来是需要更新atiomic