warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY

新配置一个服务器centos5.5，运行yum -y update出现一个警告信息：

Total                                           2.1 MB/s | 643 MB     05:00
warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID e8562897
base/gpgkey                                              | 1.5 kB     00:07
Importing GPG key 0xE8562897 "CentOS-5 Key (CentOS 5 Official Signing Key) <centos-5-key@centos.org>" from /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

这是由于yum安装了旧版本的GPG keys造成的，解决办法就是

rpm --import /etc/pki/rpm-gpg/RPM*

搞定。