Dong's Note
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CentOS yum 更新 网易源(mirrors.163.com)

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如果你安装了CentOS系统，并且yum更新慢的话，可以考虑将更新源更换为 网易提供的源：mirrors.163.com

具体操作如下：

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cd /etc/yum.repos.d/
mv CentOS-Base.repo CentOS-Base.repo.bak

vi CentOS-Base.repo

加入如下内容：

CentOS-Base.repo

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# CentOS-Base.repo 
# 
# This file uses a new mirrorlist system developed by Lance Davis for CentOS. 
# 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/$basearch/ 
baseurl=http://mirrors.163.com/centos/$releasever/os/$basearch/ 
gpgcheck=1 
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5 
#released updates 
[updates] 
name=CentOS-$releasever – Updates 
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates 
#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/ 
baseurl=http://mirrors.163.com/centos/$releasever/updates/$basearch/ 
gpgcheck=1 
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5 
#packages used/produced in the build but not released 
[addons] 
name=CentOS-$releasever – Addons 
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=addons 
#baseurl=http://mirror.centos.org/centos/$releasever/addons/$basearch/ 
baseurl=http://mirrors.163.com/centos/$releasever/addons/$basearch/ 
gpgcheck=1 
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5 
#additional packages that may be useful 
[extras] 
name=CentOS-$releasever – Extras 
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras 
#baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/ 
baseurl=http://mirrors.163.com/centos/$releasever/extras/$basearch/ 
gpgcheck=1 
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5 
#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/$basearch/ 
baseurl=http://mirrors.163.com/centos/$releasever/centosplus/$basearch/ 
gpgcheck=1 
enabled=0 
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5