Nginx and PHP-FPM running out of connections
- by E3pO
I keep running into errors like these,
[02-Jun-2012 01:52:04] WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 8 children, there are 19 idle, and 49 total children
[02-Jun-2012 01:52:05] WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 16 children, there are 19 idle, and 50 total children
[02-Jun-2012 01:52:06] WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 32 children, there are 19 idle, and 51 total children
[02-Jun-2012 03:10:51] WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 8 children, there are 18 idle, and 91 total children
I changed my settings for php-fpm to these,
pm.max_children = 150 (It was at 100, i got a max_children reached and upped to 150)
pm.start_servers = 75
pm.min_spare_servers = 20
pm.max_spare_servers = 150
Resulting in
[02-Jun-2012 01:39:19] WARNING: [pool www] server reached pm.max_children setting (150), consider raising it
I've just launched a new website that is getting a conciderable amount of traffic on it. This traffic is legitimate and users are getting 504 gateway timeouts when the limit is reached.
I have limited connections to my server with IPTABLES and I'm running fail2ban and keeping track of nginx access logs. The traffic is all legitimate, i'm just running out of room for users.
I'm currently running on a dual core box with ubuntu 64bit.
free
total used free shared buffers cached
Mem: 6114284 5726984 387300 0 141612 4985384
-/+ buffers/cache: 599988 5514296
Swap: 524284 5804 518480
My php.ini max_input_time = 60
My nginx config is
worker_processes 4;
pid /var/run/nginx.pid;
events {
worker_connections 19000;
# multi_accept on;
}
worker_rlimit_nofile 20000; #each connection needs a filehandle (or 2 if you are proxying)
client_max_body_size 30M;
client_body_timeout 10;
client_header_timeout 10;
keepalive_timeout 5 5;
send_timeout 10;
location ~ \.php$ {
try_files $uri /er/error.php;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_connect_timeout 60;
fastcgi_send_timeout 180;
fastcgi_read_timeout 180;
fastcgi_buffer_size 128k;
fastcgi_buffers 256 16k;
fastcgi_busy_buffers_size 256k;
fastcgi_temp_file_write_size 256k;
fastcgi_max_temp_file_size 0;
fastcgi_intercept_errors on;
fastcgi_pass unix:/tmp/php5-fpm.sock;
fastcgi_index index.php;
include fastcgi_params;
}
What can I do to stop running out of connections? Why does this keep occurring? I'm monitoring my traffic on Google Analytics realtime and when the user count gets above about 120 my php-fpm.log is full of these warnings..
