CentOS 7 修改默认 yum 源

修改CentOS默认yum源为mirrors.aliyun.com
1、首先备份系统自带的yum源配置文件

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

 2、进入yum配置文件所在文件夹

[root@localhost ~]# cd /etc/yum.repos.d/

3、下载aliyun的yum源配置文件到：

[root@localhost ~]# cd /etc/yum.repos.d/

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

CentOS 7:

# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

CentOS 6:

# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo

CentOS 5:

# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo

2,运行yum makecache生成缓存

# yum clean all

# yum makecache

3、更新系统

# yum -y update

如果生成缓存的时候提示如下错误

 需要执行如下命令

rm -rf /var/run/yum.pid
/sbin/service yum-updatesd restart