Nginx and php-fpm communication issue

nginxphp-fpm

I have 2 nginx server and 4 dedicated php-fpm servers configured in upstream for executing PHP with 2 instances each means in upstream i have given 8 instances with ports 9000 & 9001 for each php-fpm server.

Sometime what happens nginx not able to connect php-fpm on port 9000 and 9001 and even when i do telnet from nginx to php-fpm server on port 9000 or 9001 it does not connect.

What kind of log should be enabled on nginx and php-fpm to identify the issue weather its a network connectivity issue or server issue.

Any help would be greatly appreciated.

Thanks

Best Answer

It is possible that php-fpm only listens on 127.0.0.1 en does not accept connections from other servers, you should run (as root) 'netstat -tulnp' and see on what port/address php-fpm listens on.

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Find your php-fpm configuration (default source install location is /usr/local/etc/php-fpm.conf) and make sure that listen.allowed_clients is set to allow the IP of your Nginx box.

If this doesn't fix it then check your Nginx error log for further details.

NGINX + PHP FPM connect() failed (110: Connection timed out) while connecting to upstream

Use unix sockets, instead of TCP/IP. So, you'd do something like:

listen = /tmp/php.sock

If you don't want to do something like that, check your firewall rules. If you're using any sort of conntrack rules, you could easily be filling up the table for that. See if there's any log messages in dmesg about it. You shouldn't really be using conntrack on a high-load server, so disabling that is probably a good idea.

Also, check your ulimit settings. If the number of open files is set too low, you could run into issues.

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