1、首先備份系統自帶yum源配置檔案/etc/yum.repos.d/centos-base.repo
mv /etc/yum.repos.d/centos-base.repo /etc/yum.repos.d/centos-base.repo.backup
2、進入yum源配置檔案所在的資料夾
cd /etc/yum.repos.d/
163的yum源配置檔案
ailiyun的yum源配置檔案##centos7
wget -o /etc/yum.repos.d/centos-base.repo
##centos6
wget -o /etc/yum.repos.d/centos-base.repo
##centos5
wget -o /etc/yum.repos.d/centos-base.repo
4、執行yum makecache生成快取#centos-7
wget -o /etc/yum.repos.d/centos-base.repo
#centos-6
wget -o /etc/yum.repos.d/centos-base.repo
#centos-5
wget -o /etc/yum.repos.d/centos-base.repo
yum makecache
5、執行yum makecache日誌資訊
[root@localhost ~]# yum -y update
已載入外掛程式:fastestmirror, refresh-packagekit, security
設定更新程序loading mirror speeds from cached hostfile
* base: mirrors.163.com
* extras: mirrors.163.com
* updates: mirrors.163.com
## 或者是
已載入外掛程式:fastestmirror, refresh-packagekit, security
設定更新程序loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
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