CentOS 使用yum时出現 public.gpg.key error

執行

Version 5
rpm –import /usr/share/doc/centos-release-5/RPM-GPG-KEY*

Version 4
rpm –import /usr/share/doc/centos-release-4/RPM-GPG-KEY*

Version 3
rpm –import /usr/share/doc/centos-release-3/RPM-GPG-KEY-CentOS-3

如果没有找些文件的话，先可以手动去下载到相应的目录：
http://mirror.be10.com/centos/5/os/i386/RPM-GPG-KEY-CentOS-5
http://mirror.be10.com/centos/4/os/i386/RPM-GPG-KEY
http://mirror.be10.com/centos/4/os/i386/RPM-GPG-KEY-centos4
http://mirror.be10.com/centos/3/os/i386/RPM-GPG-KEY-CentOS-3

然后再运行上述命令即可

就可以用 yum 更新了