Nginx under PHP frequently stuck dead 502

Resolution: [WARNING] Fpm_children_bury (), line 215:child 2736 (pool default) exited on signal SIGTERM after 59.588363 seconds From startposted by  break ice  on 2013-6-7 23:59 Friday trial Nginx + PHP FastCGI do Web server, run for a few months, the trouble is often encountered Nginx 502 bad Gat eWAY the problem. Refer to a lot of changes, this 502 problem has been existing, today intends to reload PHP fastcgi to the installation directory of PHP, found that PHP log file has dozens of m size, open a look, the results are basically all the error:  jan 11 08:54:01.164292 [NOTICE] Fpm_children_make (), line 352:child 10088 (pool default) Startedjan 08:54:01.164325 [WARNING] Fpm_children_bury (), line 215:child 7985 (pool default) exited on signal SIGTERM after 63.778601 seconds from Startja n one 08:54:01.165485 [NOTICE] Fpm_children_make (), line 352:child 10089 (pool default) Startedjan one 08:54:01.165514 [WAR NING] Fpm_children_bury (), line 215:child 7999 (pool default) exited on signal SIGTERM after 60.297326 seconds from St Artjan 08:54:01.166696 [NOTICE] Fpm_children_make (), line 352:child 10090 (pool default) Startedjan 11 08:54:01.166727 [WARNING] Fpm_children_bury (), Line 215:child 8000 (pool default) exited on signal SIGTERM after 60.296946 seconds from Startjan 11 08:54:01.167855 [NOTICE] Fpm_children_make (), line 352:child 10091 (pool default) Startedjan 04:00:50.443884 [NOTICE] Fpm_children_mak E (), line 352:child 10127 (pool default) Startedjan 04:00:50.443917 [NOTICE] Fpm_event_loop (), line 107:libevent:ent ering main Loopjan 12:05:08.425141 [WARNING] fpm_request_check_timed_out (), line 158:child 10120, script '/home/htdocs /www/index.php ' (pool default) execution timed out (30.051306 sec), terminating   checked resources online, The basic is that the PHP thread opens a file handle that is limited by the error. The specific solution is as follows:  1. Raise the file handle of the server open open/etc/security/limits.conf: (Increased) * Soft nofile 51200* hard nofile 51200# vi/etc/security/limits.conf Plus
* Soft Nofile 51200
* Hard Nofile 51200 2, increase the number of open Nginx process fileNginx.conf:worker_rlimit_nofile 51200; 3, modify the php-fpm.conf file, the main need to modify 2。  Command Ulimit-n View the number of open files that are restricted, and the options in php-fpm.conf rlimit_files ensure that they are consistent with this value. <value name= "max_requests" >10240</value> <value name= "Rlimit_files" >51200</value> 4, # VI/ Etc/sysctl.conf
Bottom add
fs.file-max=51200

Complete the above changes, restart PHP, the warning message no longer. The world is quiet, 502 bad Gateway.

Nginx under PHP frequently stuck dead 502