Sample code to implement IP access shunting through Nginx reverse proxy

This article introduces the sample code to implement IP access shunting through Nginx reverse proxy and shares it with you. The details are as follows:

It is a common server deployment architecture to use Nginx as a reverse proxy to realize triage to reduce the load and pressure on the server. In this article, we will share a method of how to shunt according to the route IP.

Shunt according to specific IP

Forward the last bit 0 or 2 or 6 of the last segment 1 of the IP address to test-01.com for execution, otherwise forward to test-02.com for execution.

upstream test-01.com {
 server 192.168.1.100:8080;
}

upstream test-02.com {
 server 192.168.1.200:8080;
}

server {

 listen 80;
 server_name www.test.com;

 location / {
  if ( $remote_addr ~* ^(.*)\.(.*)\.(.*)\.*[026]$){
     proxy_pass http://test-01.com;
     break;
    }
    proxy_pass http://test-02.com;
  }
}

Forward the first 3 paragraphs of the IP address 192.168.202.* to test-01.com for execution, otherwise forward to test-02.com for execution.

upstream test-01.com {
 server 192.168.1.100:8080;
}

upstream test-02.com {
 server 192.168.1.200:8080;
}

server {

 listen 80;
 server_name www.test.com;

 location / {
    if ( $remote_addr ~* ^(192)\.(168)\.(202)\.(.*)$) {
      proxy_pass http://test-01.com;
      break;
    }
    proxy_pass http://test-02.com;
  }

}

Shunt according to the specified range IP

Forward the last paragraph of the IP address 1-100 to test-01.com for execution, otherwise forward it to test-02.com for execution.

upstream test-01.com {
 server 192.168.1.100:8080;
}

upstream test-02.com {
 server 192.168.1.200:8080;
}

server {

 listen 80;
 server_name www.test.com;

 location / {
   if ( $remote_addr ~* ^(.*)\.(.*)\.(.*)\.[1,100]$){
     proxy_pass http://test-01.com;
     break;
   }
   proxy_pass http://test-02.com;
 }

}

Shunted according to forwarded address

Forward the access beginning with 212 in paragraph 1 of the IP address to test-01.com for execution, otherwise forward to test-02.com for execution.

upstream test-01.com {
 server 192.168.1.100:8080;
}

upstream test-02.com {
 server 192.168.1.200:8080;
}

server {

 listen 80;
 server_name www.test.com;

 location / {
   if ( $http_x_forwarded_for ~* ^(212)\.(.*)\.(.*)\.(.*)$){
     proxy_pass http://test-01.com;
     break;
   }
   proxy_pass http://test-02.com;
 }

}

The role of the if directive

The if directive: determines whether the value of the expression is true (true), and if so, executes the following curly braces.

Here are some common ways to compare conditional expressions:

A full comparison of variables can be made using = or! = operator Partial matches can be represented using a regular expression of ~ or ~* ~ means case sensitive ~* means case insensitive (nginx and Nginx are identical) ! ~ with! ~* is the reverse operation, that is, does not match Check if the file exists using -f or! - f operators Check if the directory exists using -d or! - d operators Check if a file, directory, or symbolic connection exists using -e or! - e operators Check if the file is executable using -x or! - x operators The partial matching of the regular expression can be done with parentheses, and the matching part can be replaced with the $1~$9 variable