Linux修改yum源为阿里云、网易、中国科技大学

说明

1.阿里

1.1备份当前的yum源

1.2下载新的CentOS-Base.repo 到/etc/yum.repos.d/

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

CentOS 6
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo 或者
curl -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 或者
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo[/code]
1.3 清空并生成缓存
yum clean all
yum makecache

备注
yum 会把下载的软件包和header存储在cache中(默认路径/var/cache/yum/)，而不自动删除。如果觉得占用磁盘空间，可以使用yum clean指令进行清除，更精确 的用法是yum clean headers清除header，yum clean packages清除下载的rpm包，yum clean all全部清除。

2.网易
2.1备份当前的yum源
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

2.2 下载对应版本repo文件, 放入/etc/yum.repos.d/
http://mirrors.163.com/.help/CentOS7-Base-163.repo
 http://mirrors.163.com/.help/CentOS6-Base-163.repo  http://mirrors.163.com/.help/CentOS5-Base-163.repo[/code] 
2.3运行以下命令生成缓存
yum clean all
yum makecache

3. 中科大
3.1首先备份CentOS-Base.repo
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

3.2下载对应版本的CentOS-Base.repo, 放入/etc/yum.repos.d/
Centos5 https://lug.ustc.edu.cn/wiki/_export/code/mirrors/help/centos?codeblock=1 
Centos6 https://lug.ustc.edu.cn/wiki/_export/code/mirrors/help/centos?codeblock=2 
Centos7 https://lug.ustc.edu.cn/wiki/_export/code/mirrors/help/centos?codeblock=3[/code] 
3.3运行以下命令生成缓存
yum clean all
yum makecache