1.将centos的yum文件全部拷贝过来，不过实际只是用了Base的文件
[root@server yum.repos.d]# ls
CentOS-Base.repo CentOS-Debuginfo.repo.b CentOS-Media.repo.b server.repo.b
2.查看一下文件吧，学到以下几点
enabled=0 不启用该yum；
[root@server yum.repos.d]# cat CentOS-Base.repo
# 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-$releasever - Base
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
#baseurl=http://mirror.centos.org/centos/6/os/x86_64/
baseurl=http://mirrors.sohu.com/centos/6/os/x86_64/
gpgcheck=1
#gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
#gpgkey=http://mirror.centos.org/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6
gpgkey=http://mirrors.sohu.com/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6
#released updates
[updates]
name=CentOS-$releasever - Updates
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
#baseurl=http://mirror.centos.org/centos/6/updates/x86_64/
baseurl=http://mirrors.sohu.com/centos/6/updates/x86_64/
http://mirrors.163.com/centos/6/updates/x86_64/
gpgcheck=1
#gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
#gpgkey=http://mirror.centos.org/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6
gpgkey=http://mirrors.sohu.com/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
#baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
#baseurl=http://mirror.centos.org/centos/6/extras/x86_64/
baseurl=http://mirrors.sohu.com/centos/6/extras/x86_64/
gpgcheck=1
#gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
#gpgkey=http://mirror.centos.org/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6
gpgkey=http://mirrors.sohu.com/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6
######################################################################################
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus
#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
#contrib - packages by Centos Users
[contrib]
name=CentOS-$releasever - Contrib
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib
#baseurl=http://mirror.centos.org/centos/$releasever/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
[root@server yum.repos.d]#