Redhat默认的源不但速度不给力，而且软件版本陈旧，今天试着将Redhat默认源替换为CentOS的163源，发现速度能达到2M/s左右，而且版本都比较新，非常给力，与大家分享！
（目前可以使用CentOS0-6.3软件仓库的软件）
1. 删除原有的yum源
# rpm -aq | grep yum|xargs rpm -e --nodeps
2.下载新的yum安装包，这里使用centos-6.3
# wget http://mirror.centos.org/centos/6.3/os/x86_64/Packages/python-iniparse-0.3.1-2.1.el6.noarch.rpm # wget http://mirror.centos.org/centos/6.3/os/x86_64/Packages/yum-metadata-parser-1.1.2-16.el6.x86_64.rpm # wget http://mirror.centos.org/centos/6.3/os/x86_64/Packages/yum-3.2.29-30.el6.centos.noarch.rpm # wget http://mirror.centos.org/centos/6.3/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.30-14.el6.noarch.rpm
3.安装yum软件包
#rpm -ivh python-iniparse-0.3.1-2.1.el6.noarch.rpm
# rpm -ivh yum-metadata-parser-1.1.2-16.el6.x86_64.rpm
# rpm -ivh yum-plugin-fastestmirror-1.1.30-14.el6.noarch.rpm --nodeps
#rpm -ivh yum-3.2.29-30.el6.centos.noarch.rpm
4. 更改yum源
在/etc/yum.repos.d/新建文件centos.repo,内容如下：
######################################################################### # CentOS-Base.repo # # The mirror system uses the connecting IP address of the client and the # update status of each mirror to pick mirrors that are updated to and # geographically close to the client. You should use this for CentOS updates # unless you are manually picking other mirrors. # # If the mirrorlist= does not work for you, as a fall back you can try the # remarked out baseurl= line instead. # # [base] name=CentOS-6 - Base - 163.com baseurl=http://mirrors.163.com/centos/6/os/$basearch/ #mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=os gpgcheck=1 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6 #released updates [updates] name=CentOS-6 - Updates - 163.com baseurl=http://mirrors.163.com/centos/6/updates/$basearch/ #mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=updates gpgcheck=1 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6 #additional packages that may be useful [extras] name=CentOS-6 - Extras - 163.com baseurl=http://mirrors.163.com/centos/6/extras/$basearch/ #mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=extras gpgcheck=1 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6 #additional packages that extend functionality of existing packages [centosplus] name=CentOS-6 - Plus - 163.com baseurl=http://mirrors.163.com/centos/6/centosplus/$basearch/ #mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=centosplus gpgcheck=1 enabled=0 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6 #contrib - packages by Centos Users [contrib] name=CentOS-6 - Contrib - 163.com baseurl=http://mirrors.163.com/centos/6/contrib/$basearch/ #mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=contrib gpgcheck=1 enabled=0 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6 #########################################################################
5.清理yum缓存
# yum clean all # yum makecache #将服务器上的软件包信息缓存到本地,以提高搜索安装软件的速度 # yum install software_name #测试新源是否可用
6.更新系统
#yum update -y
问题：
（1）如果出现域名不能解析的情况，添加nameserver 8.8.8.8到/etc/resolv.conf中即可。
（2）红色部分需要注意的是yum-plugin-fastestmirror-1.1.30-14.el6.noarch.rpm与yum-3.2.29-30.el6.centos.noarch.rpm yum-plugin-fastestmirror-1.1.30-14.el6.noarch.rpm相互依赖，所以要加–nodeps参数。