Nginx – Making php use specific network interface / IP

networkingnginxPHPphp-fpm

TL;DR: Is there a runtime or php.ini directive for IP/network interface?

Setup: Debian, NginX, php-fpm

The machine has multiple IPs configured in the network interfaces. Each virtual host in NginX is listening to a specific IP. If there is any networking related action performed by PHP, for example a cURL call, the default IP is used every time. If I set CURLOPT_INTERFACE manually in a script, the correct ip is being used, but I need to do this automatically somehow via NginX vhost and php-fpm handshake.

So, site1.com get's called, somehow it needs to pass the ip that that site is listening on to the php-fpm and php-fpm needs to set it as the network interface to use for any Internet connections php will make during execution, be it cURL, get_file_contents(), or any other function.

Can this be done?

Thanks

Best Answer

To answer your TLDR, no that can't be done in PHP itself. There is no global setting that can be changed for all outbound traffic like file_get_contents/etc. As you stated you can customize the interface for curl and several other packages/ components, but there's nothing to globally set it.

Mark Strosberg's answer should work for curl!

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From your log entry:

WARNING: [pool www] child 920 said into stderr: "NOTICE: PHP message: PHP Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 39277825 bytes) in Unknown on line 0"

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You can use the second php-fpm backend and depending on source IP pass the request to new one. These are some examples.

The php-fpm config wikth required memory limit and execution timeout:

[import]
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...
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By using ngx_http_geo_module and if directive pass to second backend:

geo $import {
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 80.84.xx.xx            1;
}

server {
  listen 80;
  server_name example.com;
  ...
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Nginx – How to set memory limit and execution timeout for a specific IP address using php-fpm and nginx

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