How to set up a proxy server to access the network outside the network

background

First, there are two servers AB, wherein A presence or absence of the external network, B outside the network. A configuration (network IP172.19.58.202 \ system CentOS7.4), B configuration (network IP172.19.58.201 \ system CentOS7.4). A server is now unable to access the Internet, you need to use a proxy way to get there is by B A visit outside the network outside the network.

The total operation can be divided into two parts: one, two proxy configuration A, the agent is installed on the server B.

A proxy configuration

This step is relatively simple, straightforward configuration environment variable. It can be disposed in the / etc / profile, here employed /etc/profile.d folder configuration environment variable.

#cd到/etc/profile.d/目录下
#新建proxy.sh，命名无所谓
[root@ali2 /] cd /etc/profile.d/
[root@ali2 profile.d] vi proxy.sh

proxy.sh contents inside:

#IP为要连接的代理服务器B，端口是要代理的端口，如下的意思该服务器要通过172.19.58.201服务器的端口10991的代理来访问外网
export http_proxy=http://172.19.58.201:10991
#如果要设置https代理，应该添加如下配置，暂未尝试过
#export https_proxy=http://172.19.58.201:10991
#设置不代理的IP或者网址，如下配置，这些请求不会被代理，不支持模糊匹配
export no_proxy="127.0.0.1, localhost, 172.19.58.202，172.19.58.201"

Then source / etc / priofile, then use the command echo $ http_proxy, if you can print out the instructions related to the successful operation of the proxy information.

[root@ali2 profile.d] echo $http_proxy
http://172.19.58.201:10991

Agent is installed on the server B

Method 1: Use squid

#安装squid，这里采用yum的安装方式
[root@ali1 ~] yum install -y squid
#cd到配置文件目录下
[root@ali1 ~] cd  /etc/squid/
#备份原始配置文件
[root@ali1 ~] cp squid.conf squid.conf_bak
#修改配置文件
[root@ali1 squid]# vi squid.conf

squid.conf configuration file is modified as follows

 

#将http_access deny all注释修改为http_access allow all
#http_access deny all
http_access allow all
# 修改端口为代理的端口
http_port 10991

start up

#检查语法是否错误
[root@ali1 squid] squid -k parse
#初始化缓存空间
[root@ali1 squid] squid -z
[root@ali1 squid] 2018/12/05 13:58:56 kid1| Set Current Directory to /var/spool/squid
2018/12/05 13:58:56 kid1| Creating missing swap directories
2018/12/13:58:56 kid1| No cache_dir stores are configured.
#启动squid
[root@ali1 squid] service squid start
Redirecting to /bin/systemctl start squid.service
#检查端口是否开启成功
[root@ali1 squid]# netstat -an | grep 10991
tcp6       0      0 :::10991                :::*                    LISTEN     

Test, using wget baidu.com or curl www.baidu.com within the test network server can access the Internet

[root@ali2 ~] wget baidu.com
--2018-12-05 14:07:48--  http://baidu.com/
Connecting to 172.19.58.201:10991... connected.
Proxy request sent, awaiting response... 200 OK
Length: 81 [text/html]
Saving to: ‘index.html.1’
100%[=================================================================================================================================>] 81          --.-K/s   in 0s      
2018-12-05 14:07:48 (20.7 MB/s) - ‘index.html.1’ saved [81/81]

Second way: using nginx

Yet written

Summary of steps

A server

cd /etc/profile.d/
vi proxy.sh
#####################
export http_proxy=http://172.19.58.201:10991
export no_proxy="127.0.0.1, localhost, 172.19.58.202，172.19.58.201"
#####################
source /etc/profile

Server B (squid Method)

 

yum install -y squid
cd  /etc/squid/
cp squid.conf squid.conf_bak
vi squid.conf
#########################################
#将http_access deny all注释修改为http_access allow all
#http_access deny all
http_access allow all
# 修改端口为代理的端口
http_port 10991
#############################################
service squid start
结束：开始测试