修改CentOS默认yum源为国内yum镜像源

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1、首先备份系统自带yum源配置文件/etc/yum.repos.d/CentOS-Base.repo

[root@localhost ~]# mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

2、下载ailiyun的yum源配置文件到/etc/yum.repos.d/

[root@localhost ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

3、更新配置

[root@localhost ~]# yum clean all
[root@localhost ~]# yum makecache
[root@localhost ~] # yum -y update