Implementation of Nginx Intranet Standalone Reverse Proxy

Nginx Intranet Standalone Reverse Proxy

Ubuntu18.04 virtual machine 1 IP: 192.168.10.10
Ubuntu18.04 virtual machine 2 IP: 192.168.10.11

Test purpose: Deploy Nginx server on virtual machine 1 (192.168.10.10:80), access the self-set domain name through the browser, and reverse proxy to the intranet virtual machine 2 (192.168.10.11:1234).

It is best that virtual machine 2 can be accessed with a browser, and the display interface is different from Nginx, such as installing a tomcat.

1 Nginx Installation

Virtual machine 1 is used as the Nginx server and is installed as follows:

sudo apt-get install build-essential
sudo apt-get install libtool
sudo apt-get update
sudo apt-get install libpcre3 libpcre3-dev
sudo apt-get install zlib1g-dev
sudo apt-get install openssl
sudo apt-get update
sudo apt-get install nginx

Run the systemctl status nginx command to verify whether the installation is successful.

$ systemctl status nginx
● nginx.service - A high performance web server and a reverse proxy server
   Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: en
   Active: active (running) since Mon 2021-11-01 10:07:38 CST; 4h 19min ago
     Docs: man:nginx(8)
 Main PID: 8915 (nginx)
    Tasks: 3 (limit: 9461)
   CGroup: /system.slice/nginx.service
           ├─8915 nginx: master process /usr/sbin/nginx -g daemon on; master_pro
           ├─8916 nginx: worker process
           └─8917 nginx: worker process
...

2 Configure Nginx

Virtual Machine 1:

/etc/nginx/nginx.conf is the main configuration file. I haven't studied it in detail, but be sure to uncomment the following content:

include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;

After modification, restart Nginx with service nginx restart.

Create /etc/nginx/conf.d/test.conf as follows:

server {
  listen 80; #Nginx server listening port charset utf-8;
  server_name test.com; #Domain name location / {
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forward-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_set_header X-Nginx-Proxy true;

    proxy_pass http://192.168.10.11:1234/; #reverse proxy IP+port proxy_redirect off;
  }
}

In the proxy_pass http://192.168.10.10:1234/; line, don’t forget to add the final slash ‘/’.

nginx -s reload updates the configuration

The principle of reload:
1 First check whether the configuration syntax is correct
2 The main process tries to apply the configuration
3 If successful: start a new worker process and close the old one
4 If failed: main process configuration rollback

3 Modify the hosts file

Virtual machine 1 adds the following to the /etc/hosts file:

192.168.10.10 test.com

4 Testing

Enter 192.168.10.10 in the browser, and the text of Nginx is displayed. This is the Nginx effect of virtual machine 1 itself.

When you enter test.com, the application content of virtual machine 2 appears, indicating that the reverse proxy is successful.

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