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=$basearch&repo=contrib,　　gpgcheck=1,　　enabled=0,　　gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6,　　文件免费下载地址：http://download.csdn.net/detail/chenyiming_1990/7032825,　　centos /etc/yum.repo.d/中.repo源的配置与编写详解,　　# CentOS-Base.repo,　　#,　　# The mirror system uses the connecting IP address of the client and the,　　# update status of each mirror to pick mirrors that are updated to and,　　# geographically close to the client. You should use this for CentOS updates,　　# unless you are manually picking other mirrors.,　　#,　　# If the mirrorlist= does not work for you, as a fall back you can try the,　　# remarked out baseurl= line instead.,　　#,　　#,　　[base] //唯一标识的名称,　　name=CentOS-$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,