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CentOS修改yum更新源
1. 在修改前先备份该文件
cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
2. 修改更新源配置文件（CentOS6地址，其他版本类似）
vim打开配置文件：
vim /etc/yum.repos.d/CentOS-Base.repo
复制以下内容粘贴到配置文件中进行：
# 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-$releasever - Basebaseurl=http://mirrors.oschina.com/centos/$releasever/os/$basearch/gpgcheck=1gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6[updates]name=CentOS-$releasever - Updatesbaseurl=http://mirrors.oschina.com/centos/$releasever/updates/$basearch/gpgcheck=1gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6[addons]name=CentOS-$releasever - Addonsbaseurl=http://mirrors.oschina.com/centos/$releasever/addons/$basearch/gpgcheck=1gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6[extras]name=CentOS-$releasever - Extrasbaseurl=http://mirrors.oschina.com/centos/$releasever/extras/$basearch/gpgcheck=1gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6[centosplus]name=CentOS-$releasever - Plusbaseurl=http://mirrors.oschina.com/centos/$releasever/centosplus/$basearch/gpgcheck=1enabled=0gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
最后保存配置文件。
3. 更新yum源配置
yum update
（如果不愿更新软件，选择N即可）
（来源：http://www.cnblogs.com/shockerli/p/3716893.html）
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