Centos5.5国内更新源
第1步备份yum配置文件，修改yum配置文件。cp /etc/yum.repos.d/CentOS-Base.repo CentOS-Base.repo_bakvi
/etc/yum.repo.d/CentOS-Base.repo可以用中科大
(ustc)yum源，也可以用上海交大(sjtu)yum源，两者只能选一个。用下面的内容覆盖CentOS-Base.repo就行了。#中科大(ustc)yum源，http://centos.ustc.edu.cn/centos/5/就是最新的，#也可以设置成
http://centos.ustc.edu.cn/centos/5.5/[base]name=CentOS-5 -
Basebaseurl=http://centos.ustc.edu.cn/centos/5/os/$basearch/gpgcheck=1gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5#released updates[update]name=CentOS-5 -
Updatesbaseurl=http://centos.ustc.edu.cn/centos/5/updates/$basearch/gpgcheck=1gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5#packages used/produced in the build but not released[addons]name=CentOS-5 -
Addonsbaseurl=http://centos.ustc.edu.cn/centos/5/addons
/$basearch/gpgcheck=1gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5#additional packages that may be useful[extras]name=CentOS-5 -
Extrasbaseurl=http://centos.ustc.edu.cn/centos/5/extras/$basearch/gpgcheck=1gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5#additional packages that extend functionality of existing
packages[centosplus]name=CentOS-5 -
Plusbaseurl=http://centos.ustc.edu.cn/centos/5/centosplus/$basearch/gpgcheck=1enabled=0gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5#contrib - packages by Centos Users[contrib]name=CentOS-5 - Contribbaseurl=http://centos.ustc.edu.cn/centos/5/contrib/$basearch/gpgcheck=1enabled=0gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5#第一部分结束#============分割线============注意，上下两部分只选一个#中科大(ustc)yum源，
http://ftp.sjtu.edu.cn/centos/5/就是最新的，#也可以设置成http://ftp.sjtu.edu.cn/centos/5.5/[base]name=CentOS-5 - Basebaseurl=http://ftp.sjtu.edu.cn/centos/5/os/$basearch/gpgcheck=1gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5#released
updates[update]name=CentOS-5 -
Updatesbaseurl=http://ftp.sjtu.edu.cn/centos/5/updates/$basearch/gpgcheck=1gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5#packages used/produced in the build but not released[addons]name=CentOS-5 - Addonsbaseurl=http://ftp.sjtu.edu.cn/centos/5/addons/$basearch/gpgcheck=1gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5#additional packages that may be useful[extras]name=CentOS-5 -
Extrasbaseurl=http://ftp.sjtu.edu.cn/centos/5/extras/$basearch/gpgcheck=1gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5#additional packages that extend functionality of existing
packages[centosplus]name=CentOS-5 -
Plusbaseurl=http://ftp.sjtu.edu.cn/centos/5/centosplus/$basearch/gpgcheck=1enabled=0gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5#contrib - packages by Centos Users[contrib]name=CentOS-5 -
Contribbaseurl=http://ftp.sjtu.edu.cn/centos/5/contrib/$basearch/gpgcheck=1enabled=0gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5#第二部分结束第2步中科大(ustc)yum源32位: rpm --import
http://centos.ustc.edu.cn/centos/5/os/i386/RPM-GPG-KEY-CentOS-564位: rpm --import
http://centos.ustc.edu.cn/centos/5/os/x86_64/RPM-GPG-KEY-CentOS-5上海交大(sjtu)yum源32位: rpm --import http://ftp.sjtu.edu.cn/centos/5/os/i386/RPM-GPG-KEY-CentOS-564位: rpm --import
http://ftp.sjtu.edu.cn/centos/5/os/x86_64/RPM-GPG-KEY-CentOS-5第3步yum update
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.org>\
/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。
warning: rpmts_HdrFromFdno: V3 DSA signature: NOKEY, key ID 443e18211、出现warning: rpmts_HdrFromFdno: V3 DSA signature: NOKEY, key ID 443e1821Public key for
perl-Net-Telnet-3.03-3.noarch.rpm is not
installed===========================warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID e8562897 GPG key retrieval failed: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')> 解决：导入rpm-key 1、cenos4 rpm --import /usr/share/doc/centos-release-4/RPM-GPG-KEY2、centos5 rpm --import
/etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5