How to configure Nginx to divert traffic based on the last segment of the request IP

Mainly the configuration jump of the if judgment in the location parameter. Offloading can reduce the load and pressure of the server. This is a very common server deployment architecture.
Jump based on the range of the last IP segment

#域名,ip,端口等信息请自行修改

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

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

server {

 listen 80;
 server_name www.huaji.com;

 location /
 {
  if ( $remote_addr ~* ^(.*)\.(.*)\.(.*)\.[1,125]$) {
    proxy_pass http://huaji-01.com;
    break;
  }

  proxy_pass http://huaji-02.com;
 }

}

The above is to forward the request source with the last IP segment 1-125 to huaji-01.com, and other requests to huaji-02.com, the same can be done Modify the regular rules, such as

rules: $remote_addr ~* ^(.*)\.(.*)\.(.*)\.*[0268]$ The end is an even number ip like 0268, jump Go to huaji-01.com, others jump to the second domain name;

Rule: $remote_addr ~* ^(112)\.(.*)\.(.*)\.(.*) $ IP starting with 112 jumps to the specified domain name;

Rule: $http_x_forwarded_for ~* ^(112)\.(.*)\.(.*)\.(.*)$ According to forward Address segment to divert traffic, jump to the specified domain name starting with 112

The meaning of if instruction condition judgment:

Regular expression matching, among which:

~ is case-sensitive matching

~* is case-insensitive matching

!~ and !~* are case-sensitive mismatching and case-insensitive mismatching respectively

File and directory matching, where:

-f and !-f are used to determine whether the file exists

-d and !-d are used to determine Whether the directory exists

-e and !-e are used to determine whether the file or directory exists

-x and !-x are used to determine whether the file is executable

## The last parameter of the #rewrite directive is the flag tag. The flag tag is:

last, which is equivalent to the [l] tag in apache, indicating rewrite.

break After the matching of this rule is completed, the matching will be terminated and subsequent rules will no longer be matched.

redirect returns 302 temporary redirection, and the browser address will display the url address after the jump.

permanent returns 301 permanent redirect, and the browser address will display the URL address after the jump.

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