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Nginx PHP-FPM 504 gateway timed errors

Discussion in 'Nginx, PHP-FPM & MariaDB MySQL' started by Saahib, Jun 14, 2018.

  1. Saahib

    Saahib New Member

    24
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    Oct 8, 2017
    Ratings:
    +2
    Local Time:
    12:27 PM
    1.13
    10.2
    Please fill in any relevant information that applies to you:
    • CentOS Version: i.e. CentOS 6 64bit
    • Centmin Mod Version Installed: 123.09beta01
    • Nginx Version Installed: i.e. 1.15.0
    • PHP Version Installed: i.e. 5.6.30
    • MariaDB MySQL Version Installed: i.e. 10.1.33
    • When was last time updated Centmin Mod code base ? : Yesterday
    • Persistent Config: Do you have any persistent config file options set in /etc/centminmod/custom_config.inc ? You can check via this command:

      cat /etc/centminmod/custom_config.inc


      Post output in CODE tags.
    Code:
    cat /etc/centminmod/custom_config.inc
    LETSENCRYPT_DETECT='y'
    SECOND_IP=xx.xxx.xxx.xxx
    
    I just installed it on a server with moderate traffic and I am not able to open a single page.
    The domain specific log is filled with :
    Code:
    2018/06/13 23:37:19 [error] 14149#14149: *385565 upstream timed out (110: Connection timed out) while connecting to upstream, client: 108.245.121.37, server: mydomain.com, request: "GET /Reg.php?kp=kBD25GC6001QJ0100 HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "www.mydomain.com", referrer: "http://somedomer.com/ 
    Can't even open phpinfo file.

    I am new to php-fpm, searching online suggests to increase fastcgi_read_timeout in nginx. However, If I check , it is specified at multiple location in centminmod.

    Code:
    /usr/local/nginx/conf/fastcgi_params
    /usr/local/nginx/conf/php-pool2.conf
    /usr/local/nginx/conf/php-pool3.conf
    /usr/local/nginx/conf/php-pool4.conf
    /usr/local/nginx/conf/php-pool5.conf
    /usr/local/nginx/conf/php.conf
    
    I increased to 300 in /usr/local/nginx/conf/fastcgi_params but no help.

    What should I adjust in the setup to handle high traffic but with some bad php script ?
     
  2. eva2000

    eva2000 Administrator Staff Member

    35,603
    7,841
    113
    May 24, 2014
    Brisbane, Australia
    Ratings:
    +12,085
    Local Time:
    4:57 PM
    Nginx 1.15.x
    MariaDB 5.5/10.x
    Centmin Mod is provide as is, so short of scripted related bugs or issues, any further optimisation to the web stack components - nginx, php-fpm, mariadb mysql, csf firewall etc or web app specific configurations are left to the Centmin Mod user to deal with. So I do not provide any free support for such.

    Centmin Mod default is in /usr/local/nginx/conf/php.conf which is include file found in each nginx vhost generated config file - it's a global include file so changes made in it apply to all out of box nginx vhost sites created. Default time out values are pretty high already so if you need to keep raising them, then it means your web app is the problem so look into that i.e. poorly coded or inefficient coding or doing something inefficient i.e. try to use serve large files via php i.e. using php to serve a file that is 50 megabytes in size over a slow 3G mobile connection etc
    Code (Text):
    cat /usr/local/nginx/conf/php.conf| grep timeout
    fastcgi_connect_timeout 60;
    fastcgi_send_timeout 180;
    fastcgi_read_timeout 180;
    


    Bad gateway 502 /504 timeouts are usually related to Nginx timing out waiting on PHP-FPM to respond as PHP-FPM is overloaded or overwhelmed with requests, so may need to tune PHP-FPM values. It also maybe due to PHP-FPM in turn being queued and backed up waiting on MariaDB MySQL server to respond - so also need to look at MySQL.

    You'll need to tune your PHP-FPM settings with php-fpm main pool config file at /usr/local/etc/php-fpm.conf (overview of config files) and this is left up to end user to do but here's a thread for starters to enable PHP-FPM status page output outlined at
    Enabling PHP-FPM status also allows setting up 3rd party PHP-FPM status metric monitoring from services like:

    Checking PHP-FPM etc logs



    You'll also need to check into your PHP-FPM, Nginx and MariaDB logs which you can find as outlined at How to troubleshoot Centmin Mod initial install issues

    Server logs include Nginx, PHP-FPM, MariaDB MySQL error logs as well as others. You can find your Centmin Mod install/menu logs at FAQ 7 and server logs at FAQ 19 at Centmin Mod FAQ (most up to date info in FAQ so always read that first). Spoiler tag below has info too but may not be up to date.

    Some of Centmin Mod's installed software will have their own access and error logs which maybe useful for diagnosing errors or give info, notes, or warning notices.

    Note: There's no support provided by me for diagnosing such errors which may occur for various reasons including misconfiguration of installed php/mysql scripts or applications.

    In SSH2 telnet you can use tail command to view the last X number of lines in the file.

    For example for viewing last 10 lines in the file for:

    For Nginx access and error logs:
    Code:
      tail -10 /usr/local/nginx/logs/access.log
      tail -10 /usr/local/nginx/logs/error.log
    
    For specific domainname.com access and error log:
    Code:
      tail -10 /home/nginx/domains/domainname.com/log/access.log
      tail -10 /home/nginx/domains/domainname.com/log/error.log
    
    For other system error logs located at /var/log:

    list /var/log files in ascending time order so the most recently modified files are at the bottom
    Code:
      ls -lhrt /var/log
    
    Code:
    total 2.7M
    -rw------- 1 root  root    0 Aug 29 15:33 tallylog
    -rw------- 1 root  root    0 Aug 29 15:33 spooler
    drwx------ 3 root  root 4.0K Aug 29 15:35 samba
    drwxr-xr-x 2 root  root 4.0K Aug 29 15:35 mail
    -rw-r--r-- 1 root  500     0 Oct  8 18:13 dmesg.old
    -rw------- 1 root  500     0 Oct  8 18:13 boot.log
    -rw-r--r-- 1 root  500     0 Oct  8 18:14 dmesg
    drwx------ 2 root  root 4.0K Oct  8 18:14 httpd
    drwxr-xr-x 2 root  root 4.0K Oct  8 19:08 php-fpm
    -rw-rw---- 1 mysql root 2.3K Oct  9 12:38 mysqld.log
    -rw------- 1 root  root 9.2K Oct 26 10:48 yum.log
    -rw------- 1 root  utmp  94K Nov  7 22:59 btmp
    drwxr-xr-x 2 root  root 4.0K Nov  8 00:00 sa
    -rw------- 1 root  root 269K Nov  8 21:39 messages
    -rw------- 1 root  root 110K Nov  8 23:08 secure
    -rw-rw-r-- 1 root  utmp  43K Nov  8 23:08 wtmp
    -rw-r--r-- 1 root  root 144K Nov  8 23:08 lastlog
    -rw------- 1 root  root  69K Nov  8 23:08 lfd.log
    -rw------- 1 root  root 332K Nov  8 23:08 maillog
    -rw------- 1 root  500  1.6M Nov  8 23:10 cron
    
    For PHP-FPM error log:
    Code:
      tail -10 /var/log/php-fpm/www-error.log
    
    and/or
    Code:
      /var/log/php-fpm/www-php.error.log
    
    For MySQL / MariaDB error log:
    Code:
      tail -10 /var/log/mysqld.log
    
    For CSF firewall LFD log:
    Code:
      tail -10 /var/log/lfd.log
    
    For Mail log:
    Code:
      tail -10 /var/log/maillog
    
    For Cron job logs:
    Code:
      tail -10 /var/log/cron
    

    How to edit php.ini and php-fpm configuration files ?



    Centmin Mod install created command short cuts outlined here to allow you to quickly edit your /usr/local/lib/php.ini file and your /usr/local/etc/php-fpm.conf file. Full list of command shortcuts below:
    • Edit php.ini = phpedit ( /usr/local/lib/php.ini )
    • Edit my.cnf = mycnf ( /etc/my.cnf )
    • Edit php-fpm.conf = fpmconf ( /usr/local/etc/php-fpm.conf )
    • Edit nginx.conf = nginxconf ( /usr/local/nginx/conf/nginx.conf )
    • Edit (nginx) virtual.conf = vhostconf - only edits /usr/local/nginx/conf/conf.d/virtual.conf not the additional vhost domain.com.conf files added later
    • Edit (nginx) php.conf = phpinc ( /usr/local/nginx/conf/php.conf )
    • Edit (nginx) drop.conf = dropinc ( /usr/local/nginx/conf/drop.conf )
    • Edit (nginx) staticfiles.conf = statfilesinc ( /usr/local/nginx/conf/staticfiles.conf )
    • nginx stop/start/restart = ngxstop/ngxstart/ngxrestart
    • php-fpm stop/start/restart = fpmstop/fpmstart/fpmrestart
    • mysql stop/start/restart = mysqlstop/mysqlstart/mysqlrestart
    • nginx + php-fpm stop/start/restart = npstop/npstart/nprestart
    • memcached stop/start/restart =memcachedstop/memcachedstart/memcachedrestart
    • csf stop/start/restart = csfstop/csfstart/csfrestart

    Troubleshooting Tools



    However, there's many linux tools and scripts that can help you figure out what was causing the load issues and when.

    Tools and commands you will want to read up on and learn for basic system admin tasks and troubleshooting.
    Notes:
    However, Centmin Mod users are free to help each other out and ask questions or give answers on this community forum. My hopes are that this community forum evolves so that more veteran long time Centmin Mod users help new Centmin Mod users out :)
     
  3. Saahib

    Saahib New Member

    24
    2
    3
    Oct 8, 2017
    Ratings:
    +2
    Local Time:
    12:27 PM
    1.13
    10.2
    I understand that you can't provide free support and that obviously make sense. However, I am not asking for step by step guide, just wanted to clarify things as centminmod has its own file structure (although your template for reply here is very nice and lots of things are now in one place). Btw, I will definitely come to you when I can afford you. :)

    I also know script is bad, that is why for time being I am fiddling with server if that can work.

    Btw, I see you have somewhere on similar topics people are giving output of this command :
    Code:
    ps --no-headers -o "rss,cmd" -C php-fpm | awk '{ sum+=$1 } END { printf ("%d%s\n", sum/NR/1024,"M") }'
    It gives 11M , what exactly is this ?
     
  4. eva2000

    eva2000 Administrator Staff Member

    35,603
    7,841
    113
    May 24, 2014
    Brisbane, Australia
    Ratings:
    +12,085
    Local Time:
    4:57 PM
    Nginx 1.15.x
    MariaDB 5.5/10.x
..