Nginx php-fpm fast-cgi 502 Bad Gateway Error Handling

Nginx php-fpm fast-cgi 502 Bad Gateway error is FastCGI problems, resulting in the possibility of error NGINX 502 more.
Some will find on the Internet and 502 Bad Gateway error-related problems and troubleshooting methods listed about, starting with FastCGI configuration to start:
1.FastCGI whether the process has started 2.FastCGI worker process, if not by the number of command view server to open a total number of php-cgi process ps-fe | grep "php" | grep-v "grep" | wc-l
Use the following command to see how many have been used to process php-cgi processes the request tcp netstat-anop | grep "php" | grep-v "grep" | wc-l
Close to the configuration file to set the value, that the number of worker processes set too few see: http://blog.s135.com/post/361.htm
3.FastCGI execution time is too long to increase the following parameters based on actual value fastcgi_connect_timeout 300;
fastcgi_send_timeout 300;
fastcgi_read_timeout 300;
4.FastCGI Buffer nginx and apache is not enough, as a front-end buffer limit, you can adjust the buffer parameters fastcgi_buffer_size 32k;
fastcgi_buffers 8 32k;
See: http://www.hiadmin.com/nginx-502-gateway-error% E4% B8% 80% E4% BE% 8B /
5.Proxy Buffer is not enough if you use the Proxying, adjusted proxy_buffer_size 16k;
proxy_buffers 4 16k;
See also: http://www.ruby-forum.com/topic/169040
6.https forwarding configuration error correct configuration server_name www.mydomain.com ;
location / myproj / repos (
set $ fixed_destination $ http_destination;
if ($ http_destination ~ * ^ https (.*)$)
(
set $ fixed_destination http $ 1;
)
proxy_set_header Host $ host;
proxy_set_header X-Real-IP $ remote_addr;
proxy_set_header Destination $ fixed_destination;
proxy_pass http://subversion_hosts ;
)
See also: http://www.ruby-forum.com/topic/169040
http://bizhi.knowsky.com/
7. See php-fpm.log
Error see: http://www.admin99.net/read.php/396.htm
http://hi.baidu.com/dugu2008/blog/item/0d9e9bf8e8c13b08d8f9fd14.html
8.php the bug
See: http://bugs.php.net/bug.php?id=41593
9.php-fpm.conf configuration see http://www.jefflei.com/post/232.html
http://www.php-oa.com/2008/06/05/php-fpm.html
10.nginx.conf the rewrite-url rules 11.php-fpm.pid
I in / php / sbin / php-fpm which the php_fpm_PID = / data1/php/logs/php-fpm.pid modified to # php_fpm_PID = / data1/php/logs/php-fpm.pid
So guess the problem is user permissions have php-fpm.conf in the estimation of the user to start the service would disappear also nginx 400 bad request error of the causes and solutions in nginx.conf in the client_header_buffer_size and large_client_header_buffers all stressed the large, may alleviate this problem.
The main configuration of which is client_header_buffer_size this one, the default is 1k, so less than 1k header, then the problem would not arise.
According to my configuration now is:
client_header_buffer_size 16k;
large_client_header_buffers 4 64k;
This configuration can receive 16k following header, cookie in the browser the maximum number of bytes will be very big, so it is not good to use that maximum value.
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