Nginx and PHP-FPM running out of connections

Solution 1:

Have you considered following the fine advice provided in the log message, raising the value of pm.max_children? You've got bucketloads of free RAM to accomodate them.

To answer your questions:

• What can I do to stop running out of connections? Provision more connections, or reduce the number of connections you receive.
• Why does this keep occurring? Because you keep running out of connections.

Solution 2:

We had the same issue on our webservers.

You can try to respawn the child process every X requests, to avoid memory leaks. It worked fine in Apache and FPM it's starting to work good as well.

 pm.max_requests = 50000

This will restart a child process every 50k requests