rpm --import http://mirrors.163.com/centos//RPM-GPG-KEY-CentOS-5
2.检查GPG Key
rpm -qa gpg-pubkey*
3.如果要删除Key,使用以下命令（一般不需执行）：
rpm -e gpg-pubkey-e8562897-459f07a4
4.复制添加以下更新点插入到rhel-debuginfo.repo文本里后面
vi /etc/yum.repos.d/rhel-debuginfo.repo
[base]
name=Red Hat Enterprise Linux $releasever -Base
baseurl=http://mirrors.163.com/centos/5//os/$basearch/
gpgcheck=1
[update]
name=Red Hat Enterprise Linux $releasever -Updates
baseurl=http://mirrors.163.com/centos/5//updates/$basearch/
gpgcheck=1
[extras]
name=Red Hat Enterprise Linux $releasever -Extras
baseurl=http://mirrors.163.com/centos/5//extras/$basearch/
gpgcheck=1
[addons]
name=Red Hat Enterprise Linux $releasever -Addons
baseurl=http://mirrors.163.com/centos/5//addons/$basearch/
gpgcheck=1
5.清理yum缓存
yum clean all
