CentOSyum不能用

 　　修改/etc/yum.repos.d/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 - 163.com

　　baseurl=http://mirrors.163.com/centos/$releasever/os/$basearch/

　　#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os

　　gpgcheck=1

　　gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6

　　#released updates

　　[updates]

　　name=CentOS-$releasever - Updates - 163.com

　　baseurl=http://mirrors.163.com/centos/$releasever/updates/$basearch/

　　#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$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-$releasever - Extras - 163.com

　　baseurl=http://mirrors.163.com/centos/$releasever/extras/$basearch/

　　#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$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-$releasever - Plus - 163.com

　　baseurl=http://mirrors.163.com/centos/$releasever/centosplus/$basearch/

　　#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$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-$releasever - Contrib - 163.com

　　baseurl=http://mirrors.163.com/centos/$releasever/contrib/$basearch/

　　#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib

　　gpgcheck=1

　　enabled=0

　　gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6

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　　centos /etc/yum.repo.d/中.repo源的配置与编写详解

　　# 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] //唯一标识的名称

　　name=CentOS-$releasever - Base //所使用的.repo文件的名字

　　mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os

　　#mirrorlist 是由 yum 程式自行去捉映射站台， baseurl 则是指定固定的一個容器网址

　　#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/

　　#其中url支持的协议有 http:// ftp:// file://三种。baseurl后可以跟多个url，你可以自己改为速度比较快的镜像站，但baseurl只能有一个

　　gpgcheck=1 #gpg签名检查

　　gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

　　#gpg密钥的位置，应指定本机的密钥文件只有可以与服务器上的密钥进行校验。

　　#released updates

　　#该段指向的路径是软件升级时需要的软件包

　　[updates]

　　name=CentOS-$releasever - Updates

　　mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates

　　//该路径对应服务器上的update文件夹，即自动到服务器updates文件夹里找软件包

　　#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/

　　gpgcheck=1

　　gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

　　#packages used/produced in the build but not released

　　#该段指向的路径是已经使用了或者已经制作出来的软件，但并没有发行

　　[addons]

　　name=CentOS-$releasever - Addons

　　mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=addons

　　#baseurl=http://mirror.centos.org/centos/$releasever/addons/$basearch/

　　gpgcheck=1

　　gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

　　#additional packages that may be useful

　　#该段指向的路径是可能有用的其他的软件

　　[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/

　　gpgcheck=1

　　gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

　　#additional packages that extend functionality of existing packages

　　#该段指向的路径是已经存在的软件的扩展软件、插件等等

　　[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 #enabled=0表示这个源停用 如果enabled不写 表示enabled=1

　　gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

　　#contrib - packages by Centos Users

　　#该段指向的路径是系统使用者所贡献的软件

　　[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-5