How to bypass nginx proxy a list of IPS

Question

I have an Nginx config with the redirect to holding pages:

    location / {
        ...
        if ($setholdingpage = 'True') {
        rewrite (^.*$) /holding-page last;
        }
           proxy_pass $backend;
    }

Also, I have a list of IPs that should be whitelisted and not redirected to holding pages. How it's possible to do?

Answer 1

You can use the Nginx geo module to create a variable based upon client IP address, you can specify individual IP addresses or CIDR ranges:

geo $bypassip {
  default 0;

  64.233.160.0/19 1;
  66.102.0.0/20 1;
}

Then override your variable if the IP matches one in your list:

if ($bypassip = 1){
  set $setholdingpage False;
}

I use a similar setup to block certain geographic regions but still allow Google crawlers to access my site.