把linux下的yum源更換爲阿里雲的國內源

1 .備份源

1 mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

 

2.下載新的CentOS-Base.repo 到/etc/yum.repos.d/

centos 6

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

centos 7

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

 

 

3.生成緩存

 yum clean all yum makecache