centos yum源改为163镜像源

由于centos自带的yum源速度实在受不了，就在此使用了163源，速度花花的，把/etc/yum.repo/下的Centos.Base.repo这个文件内容改为以下内容，改之前先做好备份

# 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