1、应用场景：
某些应用场景中，Linux服务器需要通过yum安装应用的包，但是这些Linux服务器可能不能连接到外网，但是内部也没有对应的yum服务器，这个时候，找一台内部能够访问外网的服务器配置一个代理，然后使用代理进行yum的动作。
2、在可以上外网的机器上配置squid代理：
[root@test_20190130_wanl01 ~]# yum -y install openssl squid [root@test_20190130_wanl01 ~]# vim /etc/squid/squid.conf # And finally deny all other access to this proxy # http_access deny all http_access allow all [root@test_20190130_wanl01 ~]# systemctl start squid [root@test_20190130_wanl01 ~]# systemctl enable squid Created symlink from /etc/systemd/system/multi-user.target.wants/squid.service to /usr/lib/systemd/system/squid.service. [root@test_20190130_wanl01 ~]# systemctl status squid ● squid.service - Squid caching proxy Loaded: loaded (/usr/lib/systemd/system/squid.service; enabled; vendor preset: disabled) Active: active (running) since Mon 2019-04-29 22:01:31 CST; 14s ago Main PID: 16818 (squid) CGroup: /system.slice/squid.service ├─16818 /usr/sbin/squid -f /etc/squid/squid.conf ├─16820 (squid-1) -f /etc/squid/squid.conf └─16821 (logfile-daemon) /var/log/squid/access.log Apr 29 22:01:31 test_20190130_wanl01 systemd[1]: Starting Squid caching proxy... Apr 29 22:01:31 test_20190130_wanl01 systemd[1]: Started Squid caching proxy. Apr 29 22:01:32 test_20190130_wanl01 squid[16818]: Squid Parent: will start 1 kids Apr 29 22:01:32 test_20190130_wanl01 squid[16818]: Squid Parent: (squid-1) process 16820 started [root@test_20190130_wanl01 ~]# netstat -ntlp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 127.0.0.1:27017 0.0.0.0:* LISTEN 2129/mongod tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 25748/nginx: master tcp 0 0 0.0.0.0:81 0.0.0.0:* LISTEN 25708/httpd tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 2291/sshd tcp 0 0 127.0.0.1:32000 0.0.0.0:* LISTEN 1275/java tcp6 0 0 :::80 :::* LISTEN 25748/nginx: master tcp6 0 0 :::3128 :::* LISTEN 16820/(squid-1) # 说明3128端口开启，说明代理是正常
3、客户端服务器配置yum代理配置
首先需要在yum的客户端编辑repo文件，因为安装相关包的时候会用到，这里参考https://www.cnblogs.com/jimboi/p/8437788.html
[root@iZvy2dcjg9cbw404qmksfhZ ~]# vim /etc/yum.conf #添加如下信息 proxy=http://27.0.1.90:3128 [root@iZvy2dcjg9cbw404qmksfhZ ~]# ping www.baidu.com ping: www.baidu.com: Name or service not known [root@iZvy2dcjg9cbw404qmksfhZ yum.repos.d]# yum -y install squid Loaded plugins: fastestmirror base | 3.6 kB 00:00:00 epel | 4.7 kB 00:00:00 extras | 3.4 kB 00:00:00 updates | 3.4 kB 00:00:00 (1/7): base/7/x86_64/group_gz | 166 kB 00:00:00 (2/7): epel/x86_64/group_gz | 88 kB 00:00:00 (3/7): extras/7/x86_64/primary_db | 188 kB 00:00:00 (4/7): epel/x86_64/updateinfo | 991 kB 00:00:00 (5/7): epel/x86_64/primary_db | 6.7 MB 00:00:00 (6/7): updates/7/x86_64/primary_db | 3.4 MB 00:00:00 (7/7): base/7/x86_64/primary_db | 6.0 MB 00:00:01 Determining fastest mirrors * base: mirrors.aliyun.com * extras: mirrors.aliyun.com * updates: mirrors.aliyun.com Resolving Dependencies
