nginx errors (504,502, 413, unable to start, syntax errors)

Table of Contents

* “504 Gateway Timeout NGINX”

504 Gateway Time-out

increase timeout limit or disable it in nginx conf

php

max_execution_time = 300

request_terminate_timeout = 300 (same as execution time if you un-comment it)

fastcgi_read_timeout 300;

sometimes timeout in fastcgi,conf

fastcgi_read_timeout 300;

fastcgi_buffers 8 16k;

fastcgi_buffer_size 32k;

fastcgi_connect_timeout 90s;

fastcgi_send_timeout 90s;

fastcgi_read_timeout 90s;

proxy_read_timeout 90s;

(if noting mentioned defaults are applicable

nginx as a proxy

proxy_connect_timeout 300;

proxy_send_timeout 300;

proxy_read_timeout 300;

send_timeout 300;

nginx disable gateway timeout

unfortunately no way to disable but you can increase upto 30 mins

300s = 5 mins

fastcgi_read_timeout 300;

proxy_read_timeout 300;

300s = 5 minutes then website loads at 5-7mins (should be in 2-3 secs)

for temporary requirement increase both php

mysql timeout

MySQL has its wait_timeout variable default value set to 28800 seconds (8 hours).

413 Request Entity Too Large

php

upload_max_filesize

post_max_size

at php.ini

client_max_body_size 100M; in nginx.conf

0 to disable.

client_header_timeout 3m;

client_body_timeout 3m;

send_timeout 3m;

client_max_body_size 100M;

nginx -s reload

LimitRequestBody 104857600 htaccess apache

502 bad gateway nginx ubuntu centos fix

nginx 502 bad gateway high traffic

522 error with cloudflare

increase fastcgi timeouts

browser >> web server>> application serer>> database serer

web server to wait (60s or 300s)

mostly in ms 2-3 seconds has to fully load.

check nginx error log

“fastcgi_connect_timeout” directive invalid value

41 client intended to send too large body

upstream timed out (php max execution time)

php or mysql too.

php-fpm related

php.ini

max_input_time

; Default Value: -1 (Unlimited)

memory_limit = 512M

Maximum amount of memory a script may consume

upload_max_filesize = 400000M

Maximum allowed size for uploaded files.

request_terminate_timeout

max_execution_time = 120

input, execution, memory limit

input+execution= fastcgi read timeout

sendfile on; send_timeout 5m; client_header_timeout 5m; client_body_timeout 10; fastcgi_max_temp_file_size 2048m;

client_header_timeout 3m;

client_body_timeout 3m;

send_timeout 3m;

client_max_body_size 100M;

upstream timed out nginx php-fpm

fastcgi_read_timeout 120;

fastcgi_read_timeout 60s; //defaults

phpmyadmin

php

fastcgi timeout

\phpmyadmin\libraries\config.default.php

Open this configuration file in any editor and change $cfg[‘ExecTimeLimit’] = 300; to $cfg[‘ExecTimeLimit’] = 0;

Nginx Syntax errors in nginx.conf or serverblocks

nginx – s reload

Nginx -t

fix the errors

nginx unable to start

Simple but Complicated,

Finding running nginx in running Process using Grep Command.

$ ps aux | grep nginx

root@instance-1:~# ps aux | grep nginx

ps aux -P | grep nginx
www-data 2665 0.0 0.4 163360 18672 ? S Jul08 0:58 nginx: worker p rocess
www-data 2666 0.0 0.4 163080 18172 ? S Jul08 0:01 nginx: worker p rocess
www-data 2667 0.0 0.3 163080 14600 ? S Jul08 0:00 nginx: cache ma nager process
root 5210 0.0 0.0 14852 1040 pts/0 S+ 12:53 0:00 grep –color=au to nginx
root 23446 0.0 0.3 158700 15916 ? Ss Mar13 0:04 nginx: master p rocess /usr/sbin/nginx -c /etc/nginx/nginx.conf

Kill Nginx Process and restart

Kill the Process by its number.

kill: 2665

less /var/log/nginx/error.log

netstat -tulpn | grep :80 (to know which application occupied this port)

Then again Start the Nginx , If any syntax errors in config files fix and start.

reinstall the web server nothing gonna lose except config file so back it up.

cloudflare 522 error fix

just increase the timeout limit both php & nginx. 1 minutes to 5 minutes not necessary.(mens there is cpu outage so its taking long time.

Nginx error log location

/var/log/nginx/error. log

try this command

less /var/log/nginx/error.log

last 10 lines.

and understand the errors related php-fpm errors or wordpress errors, mysql etc related.

Tuning Nginx Performance Perfect nginx.conf