Total size: 42 M
Downloading Packages:
warning: rpmts_HdrFromFdno: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEY
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5 GPG key retrieval failed: [Errno 14] Could not open/read file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
解决办法：
1. 先安装如下工具包：
rpm -Uhv http://dag.wieers.com/packages/rpmforge-release/rpmforge-release-0.3.4-1.el4.rf.i386.rpm
[root@localhost yum.repos.d]# rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-6
一般来说安装完成后即可，安装完这个就可以了。
如果还是不行，查看系统的
编辑yum源文件：替换 RPM-GPG-KEY-CentOS-5 替换为对应的 key 文件名：RPM-GPG-KEY-CentOS-6 （要全部替换）
root@localhost yum.repos.d]# vi CentOS-Base-sohu.repo
[base]
name=CentOS-$releasever - Base - sohu.com
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
baseurl=http://mirrors.sohu.com/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6