linux之yum源设置代理

　　一般在内网环境中,多数服务器是不能直接上外网的(为了安全),只有个别的服务器可以访问外网,在不能访问外网的服务器上安装软件由于依赖的问题很容易出错,安装不下去,这时候就可以借助可以上外网的服务器做代理来安装软件。Centos7下设置代理案例
　　A服务器
　　192.168.1.10
　　可以访问外网
　　B服务器
　　192.168.1.111
　　不能访问外网,可以通过内网IP访问A服务器在A服务器安装nginx
　　我们使用nginx作为yum的反向代理软件> yum install nginx -y
　　配置nginx> vim /etc/nginx/conf.d/yum.conf  server {         listen 80;         server_name yum.com;         location /centos/ {             proxy_pass http://mirrors.aliyun.com/centos/ ;         }          location /epel/ {             proxy_pass http://mirrors.aliyun.com/epel/ ;         }     } //重启nginx > nginx -s reload 修改B服务器的repo文件//备份 > cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak > vim /etc/yum.repos.d/CentOS-Base.repo [base] name=CentOS-$releasever - Base - yum.com failovermethod=priority baseurl=http://yum.com/centos/$releasever/os/$basearch/         http://yum.com/centos/$releasever/os/$basearch/ #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os gpgcheck=1 gpgkey=http://yum.com/centos/RPM-GPG-KEY-CentOS-7  #released updates  [updates] name=CentOS-$releasever - Updates - yum.com failovermethod=priority baseurl=http://yum.com/centos/$releasever/updates/$basearch/         http://yum.com/centos/$releasever/updates/$basearch/ #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates gpgcheck=1 gpgkey=http://yum.com/centos/RPM-GPG-KEY-CentOS-7  #additional packages that may be useful [extras] name=CentOS-$releasever - Extras - yum.com failovermethod=priority baseurl=http://yum.com/centos/$releasever/extras/$basearch/         http://yum.com/centos/$releasever/extras/$basearch/ #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras gpgcheck=1 gpgkey=http://yum.com/centos/RPM-GPG-KEY-CentOS-7  #additional packages that extend functionality of existing packages [centosplus] name=CentOS-$releasever - Plus - yum.com failovermethod=priority baseurl=http://yum.com/centos/$releasever/centosplus/$basearch/         http://yum.com/centos/$releasever/centosplus/$basearch/ #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus gpgcheck=1 enabled=0 gpgkey=http://yum.com/centos/RPM-GPG-KEY-CentOS-7  #contrib - packages by Centos Users [contrib] name=CentOS-$releasever - Contrib - yum.com failovermethod=priority baseurl=http://yum.com/centos/$releasever/contrib/$basearch/         http://yum.com/centos/$releasever/contrib/$basearch/ #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib gpgcheck=1 enabled=0 gpgkey=http://yum.com/centos/RPM-GPG-KEY-CentOS-7 B服务器上修改/etc/hosts
　　目的是让B服务器能解析yum.com> vim /etc/hosts 192.168.1.111 yum.com
　　验证B服务器是否可以解析> ping yum.com 刷新yum缓存> yum clean all > yum makecache
　　原文链接:https://rumenz.com/rumenbiji/linux-yum-proxy.html