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Nginx 502 Bad Gateway

Discussion in 'Nginx, PHP-FPM & MariaDB MySQL' started by elargento, Feb 19, 2018.

  1. elargento

    elargento Member

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    • CentOS Version: CentOS 7 64bit
    • Centmin Mod Version Installed: 123.09beta01
    • Nginx Version Installed: 1.11.10
    • PHP Version Installed: 7.0.15
    • MariaDB MySQL Version Installed: 10.1.21
    I'm doing an IPB import from XenForo 1.5 but I'm getting a 502 error during the post/thread import.
    I've contacted XF staff and they say I must look at the server error logs and they can't do anything to help me. I think there is a corrupted post somewhere but I don't know how to find the post id which is causing this error.

    tail -10 /home/nginx/domains/domainname.com/log/error.log:
    Code:
    2018/02/18 14:35:50 [error] 4994#4994: *1242 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 152.xxx.xxxx, server: xxxx.org, request: "POST /admin.php?import/import HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "www.xxxx.org", referrer: "http://www.xxx.org/admin.php?import/import"
    tail -10 /usr/local/nginx/logs/error.log
    Code:
    2018/02/18 12:21:31 [emerg] 4107#4107: open() "/usr/local/nginx/conf/autoprotect/xxxx.org/autoprotect-xxxxx.org.conf" failed (2: No such file or directory) in /usr/local/nginx/conf/conf.d/xxxxx.org.conf:33
    tail -10 /var/log/php-fpm/www-error.log
    only warnings not related to the import

    tail -10 /var/log/mysqld.log
    Code:
    2018-02-18 12:16:27 140504651729152 [Note] InnoDB: Completed initialization of buffer pool
    2018-02-18 12:16:27 140504651729152 [Note] InnoDB: Highest supported file format is Barracuda.
    2018-02-18 12:16:27 140504651729152 [Note] InnoDB: 128 rollback segment(s) are active.
    2018-02-18 12:16:27 140504651729152 [Note] InnoDB: Waiting for purge to start
    2018-02-18 12:16:27 140504651729152 [Note] InnoDB:  Percona XtraDB (http://www.percona.com) 5.6.36-83.0 started; log sequence number 1616918
    2018-02-18 12:16:27 140501508421376 [Note] InnoDB: Dumping buffer pool(s) not yet started
    2018-02-18 12:16:27 140504651729152 [Note] Plugin 'FEEDBACK' is disabled.
    2018-02-18 12:16:27 140504651729152 [Note] Server socket created on IP: '::'.
    2018-02-18 12:16:27 140504651729152 [Note] /usr/sbin/mysqld: ready for connections.
    
    Any thoughts?
     
    Last edited: Feb 19, 2018
  2. eva2000

    eva2000 Administrator Staff Member

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    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.

    Nginx 502 or 504 Bad Gateway Errors



    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 status page output outlined at

    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. elargento

    elargento Member

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    I'll ignore the post above just because it doesn't provide any specific help.

    I was able to continue the import by upgrading PHP to 7.1 and rejecting zend op installation. Fingers crossed
     
  4. eva2000

    eva2000 Administrator Staff Member

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    Nginx 1.15.x
    MariaDB 5.5/10.x
    oh well, you just missed an opportunity to learn more and improve your PHP tuning skills !
     
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  5. elargento

    elargento Member

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    If I can't understand where the error is, I don't know how to think of even a solution :cautious:
    I'm totally open to learn what is wrong here and how to fix it


    I've searched for "Connection reset by peer" error and one of the "solutions" is to reload the page. I don't want to stop here and I want to find out why the PHP upgrade "fixed" the error
     
  6. elargento

    elargento Member

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    Here you have me...still using Centmin and trying to improve my skills. I could still with cPanel since the error doesn't happen with Apache but no...I love this community!
     
  7. eva2000

    eva2000 Administrator Staff Member

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    literally the 3rd paragraph in above post of my has all the info for PHP-FPM side tuning for the issue including using PHP status statistics to delve deeper into figuring out your current state of PHP-FPM performance. But that doesn't rule out MySQL side being part of the problem as outlined in 2nd paragraph

    3rd paragraph

     
  8. elargento

    elargento Member

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    why if there is no custom config, a simple page reload after the PHP upgrade allowed me to continue with the import process?
    If PHP-FPM is overloaded or overwhelmed with requests, shouldn't that be displayed in error logs? How can I know which parameter is limiting the requests?
     
  9. eva2000

    eva2000 Administrator Staff Member

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    Nginx 1.15.x
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    Have you read the links i posted in 1st reply ? I suggest you read them fully first to understand PHP-FPM status metrics output and what they mean first as the 3rd paragraph's linked discussion threads shed light on your issue and most common PHP-FPM tuning/optimisation that folks may eventually need to do.
     
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  10. elargento

    elargento Member

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    People tend to search for error logs before reading. I have to follow Roldan's steps and play with some parameters
    [​IMG]
     
  11. eva2000

    eva2000 Administrator Staff Member

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    Nginx 1.15.x
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    Key to PHP-FPM tuning is PHP-FPM Status output + the inspecting logs

    It's not just logs for nginx but php-fpm and also maybe inspecting mysql/database backend slow query logs as it can be a chain reaction and in your case a likely case considering you're doing data import from/to a MySQL database server. Usually when I do Xenforo forum imports for clients, I monitor and measure the server's statistics and through several test import runs, optimise the server for the best import speed and performance so that final import is blazing fast.
     
  12. elargento

    elargento Member

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    Thank you for some guidance

    Isn't true centmin is installed with most optimal settings depending on server specs?

    PHP-FPM error log:
    Code:
    PHP    compiled with module API=20151012
    These options need to match
     in Unknown on line 0
    [18-Feb-2018 14:54:19] NOTICE: PHP message: PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20131226/memcached.so' - /usr/local/lib/php/extensions/no-debug-non-zts-20131226/memcached.so: undefined symbol: zval_used_for_init in Unknown on line 0
    [18-Feb-2018 14:54:19] NOTICE: PHP message: PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20151012/redis.so' - /usr/local/lib/php/extensions/no-debug-non-zts-20151012/redis.so: cannot open shared object file: No such file or directory in Unknown on line 0
    [18-Feb-2018 14:55:28] NOTICE: PHP message: PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20151012/geoip.so' - /usr/local/lib/php/extensions/no-debug-non-zts-20151012/geoip.so: cannot open shared object file: No such file or directory in Unknown on line 0
    [18-Feb-2018 14:55:28] NOTICE: PHP message: PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20151012/imagick.so' - /usr/local/lib/php/extensions/no-debug-non-zts-20151012/imagick.so: cannot open shared object file: No such file or directory in Unknown on line 0
    [18-Feb-2018 14:55:28] NOTICE: PHP message: PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20151012/mailparse.so' - /usr/local/lib/php/extensions/no-debug-non-zts-20151012/mailparse.so: cannot open shared object file: No such file or directory in Unknown on line 0
    [18-Feb-2018 14:55:28] NOTICE: PHP message: PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20151012/redis.so' - /usr/local/lib/php/extensions/no-debug-non-zts-20151012/redis.so: cannot open shared object file: No such file or directory in Unknown on line 0
    
    tail -10 /home/nginx/domains/xxx.org/log/error.log:
    Code:
    2018/02/18 14:35:50 [error] 4994#4994: *1242 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 152.169.231.104, server: xxxxx.org, request: "POST /admin.php?import/import HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "www.xxx.org", referrer: "http://www.xxx.org/admin.php?import/import"
    
    As far as I read more and more I'm understanding the backend. I was able to install phpstatus but since the stats are live, there is no way to know what parameter got overloaded. Since centmin provides optimized values depending on the server specs, I don't feel it is a good idea to start playing and change parameters with no reasons. I want to understand how I can troubleshoot this, how can I understand what value is limited but in order to do that I must find out an error log showing the specific problem.

    Maybe I'm thinking on different way than an experienced sysadmin.


    if an error comes up, the process will stop and the numbers will go down. How do you know what is the highest value they reached? I don't know how else I could explain myself

    At least Roldan saw a warning on error logs:
     
    Last edited: Feb 19, 2018
  13. eva2000

    eva2000 Administrator Staff Member

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    Centmin Mod is auto tuned to your servers hardware specs detected but that isn't same as tuned to your web app/scripts usage requirements. For the latter, you need to optimise the software for your usage requirements. Centmin Mod auto tuned gives you an optimised baseline to build upon for your own further web app specific requirements. Tuning for web apps is rarely a set and forget affair but involves constant monitoring and re-tuning based on your usage requirements :)

    • What version of Centmin Mod ? 123.08stable or 123.09beta01 ? Was it fresh install or upgrade ? How long ago did you install Centmin Mod ? There's numerous code changes, bug fixes over time, so ensure you have latest Centmin Mod code installed by upgrading your Centmin Mod code as instructed below.
    • What version of PHP used ? Did you upgrade or downgrade PHP recently ?
    • If you upgraded and you get some PHP warnings that some PHP extensions are unable to load, all you need to do is delete the relevant *.ini files for them and then reinstall if you require the PHP extension
    Example of error on restart PHP-FPM
    Code (Text):
    fpmrestart
    Gracefully shutting down php-fpm . done
    Starting php-fpm [06-Nov-2014 01:25:37] NOTICE: PHP message: PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20140815/geoip.so' - /usr/local/lib/php/extensions/no-debug-non-zts-20140815/geoip.so: cannot open shared object file: No such file or directory in Unknown on line 0
    [06-Nov-2014 01:25:37] NOTICE: PHP message: PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20140815/igbinary.so' - /usr/local/lib/php/extensions/no-debug-non-zts-20140815/igbinary.so: cannot open shared object file: No such file or directory in Unknown on line 0
    [06-Nov-2014 01:25:37] NOTICE: PHP message: PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20140815/imagick.so' - /usr/local/lib/php/extensions/no-debug-non-zts-20140815/imagick.so: cannot open shared object file: No such file or directory in Unknown on line 0
    [06-Nov-2014 01:25:37] NOTICE: PHP message: PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20140815/memcache.so' - /usr/local/lib/php/extensions/no-debug-non-zts-20140815/memcache.so: cannot open shared object file: No such file or directory in Unknown on line 0
    [06-Nov-2014 01:25:37] NOTICE: PHP message: PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20140815/memcached.so' - /usr/local/lib/php/extensions/no-debug-non-zts-20140815/memcached.so: cannot open shared object file: No such file or directory in Unknown on line 0
    done
    

    find the paths to the *.ini files
    Code (Text):
    php --ini 2>/devnull
    Configuration File (php.ini) Path: /usr/local/lib
    Loaded Configuration File:         /usr/local/lib/php.ini
    Scan for additional .ini files in: /etc/centminmod/php.d
    Additional .ini files parsed:      /etc/centminmod/php.d/curlcainfo.ini,
    /etc/centminmod/php.d/custom_php.ini,
    /etc/centminmod/php.d/geoip.ini,
    /etc/centminmod/php.d/igbinary.ini,
    /etc/centminmod/php.d/imagick.ini,
    /etc/centminmod/php.d/memcache.ini,
    /etc/centminmod/php.d/memcached.ini,
    /etc/centminmod/php.d/zendopcache.ini
    

    delete ones that are reported as unable to load so if geoip.so, igbinary.so, imagick.so, memcache.so and memcached.so are reported as unable to load, remove their respective *.ini files
    Code (Text):
    rm -rf /etc/centminmod/php.d/geoip.ini
    rm -rf /etc/centminmod/php.d/igbinary.ini
    rm -rf /etc/centminmod/php.d/imagick.ini
    rm -rf /etc/centminmod/php.d/memcache.ini
    rm -rf /etc/centminmod/php.d/memcached.ini
    

    then restart PHP-FPM again
    Code (Text):
    fpmrestart
    Gracefully shutting down php-fpm . done
    Starting php-fpm  done
    

    Code (Text):
    php -v
    PHP 7.0.0-dev (cli) (built: Nov  6 2014 00:54:07)
    Copyright (c) 1997-2014 The PHP Group
    Zend Engine v2.8.0-dev, Copyright (c) 1998-2014 Zend Technologies
        with Zend OPcache v7.0.4-dev, Copyright (c) 1999-2014, by Zend Technologies
    


    Manually reinstall PHP extension



    For reported PHP extensions that do not load, i.e. "PHP Startup: Unable to load dynamic" and references PHPEXTENSIONNAME.so, some can be installed again via centmin.sh menu. For instance menu options 7, 9, 10, 12, 15, 18, and 19.

    for 123.08stable
    Code (Text):
    --------------------------------------------------------
    Centmin Mod 1.2.3-eva2000.08
    --------------------------------------------------------
                       Centmin Mod Menu       
    --------------------------------------------------------
    1).  Centmin Install
    2).  Add Nginx vhost domain
    3).  NSD setup domain name DNS
    4).  Nginx Upgrade / Downgrade
    5).  PHP Upgrade / Downgrade
    6).  XCache Re-install
    7).  APC Cache Re-install
    8).  XCache Install
    9).  APC Cache Install
    10). Memcached Server Re-install
    11). MariaDB 5.2, 5.5, 10 Upgrade Sub-Menu
    12). Zend OpCache Install/Re-install
    13). Install ioping.sh vbtechsupport.com/1239/
    14). SELinux disable
    15). Install/Re-install ImageMagick PHP Extension
    16). Change SSHD Port Number
    17). Multi-thread compression: pigz,pbzip2,lbzip2,p7zip etc
    18). Suhosin PHP Extension install
    19). Install FFMPEG and FFMPEG PHP Extension
    20). NSD Re-install
    21). Update - Nginx + PHP-FPM + Siege
    22). Add Wordpress Nginx vhost + WP Super Cache
    23). Exit
    --------------------------------------------------------
    Enter option [ 1 - 23 ]
    --------------------------------------------------------
    


    for 123.09beta01 - menu options 7, 9, 10, 12, 13 (for redis), 15, 18, and 19 are relevant menu options that can be used only if the specific PHP extension is reporting as unable to load
    Code (Text):
    --------------------------------------------------------
         Centmin Mod Menu 123.09beta01 centminmod.com
    --------------------------------------------------------
    1).  Centmin Install
    2).  Add Nginx vhost domain
    3).  NSD setup domain name DNS
    4).  Nginx Upgrade / Downgrade
    5).  PHP Upgrade / Downgrade
    6).  XCache Re-install
    7).  APC Cache Re-install
    8).  XCache Install
    9).  APC Cache Install
    10). Memcached Server Re-install
    11). MariaDB 5.2/5.5 & 10.x Upgrade Sub-Menu
    12). Zend OpCache Install/Re-install
    13). Install/Reinstall Redis PHP Extension
    14). SELinux disable
    15). Install/Reinstall ImagicK PHP Extension
    16). Change SSHD Port Number
    17). Multi-thread compression: pigz,pbzip2,lbzip2...
    18). Suhosin PHP Extension install
    19). Install FFMPEG and FFMPEG PHP Extension
    20). NSD Install/Re-Install
    21). Update - Nginx + PHP-FPM + Siege
    22). Add Wordpress Nginx vhost + Cache Plugin
    23). Update Centmin Mod Code Base
    24). Exit
    --------------------------------------------------------
    Enter option [ 1 - 24 ]
    


    Upgrading Centmin Mod Code to Latest Version



    Getting Started Guide step 19 outlines also how to keep Centmin Mod code updated or how to switch version branches.

    Centmin Mod LEMP stack's script code is constantly updated for improvements, bug fixes and security fixes so keeping the Centmin Mod code up to date is important. With Centmin Mod 1.2.3-eva2000.08) (123.08stable) and higher releases, a newly added centmin.sh menu option 23 allows much easier code updates and version branch swicthing via Git backed environment you can setup. For full details read the following links:
    Upgrading Centmin Mod involves 2 parts.
    1. Upgrading the actual Centmin Mod code outlined at Upgrade Centmin Mod. This is heart of Centmin Mod where the code is the engine that runs centmin.sh shell based menu and all the automation you're accustomed to. You can easily update within a Centmin Mod version branch or switch version branches via centmin.sh menu option 23 outlined here.
    2. Upgrade software that Centmin Mod installed or manages. For this part following outline at How to upgrade Centmin Mod software installed on your server.

    That's why it's always good idea to have a test VPS or clone of your live server for testing changes in a controlled environment as per tip at Guide to learning more about Centmin Mod. Also always backup your settings before making changes and always document the changes you make so you can revert them. This is where monitoring server stats is key as to be able to measure and see whether changes you make have a positive or negative effect - which is why my initial reply in this thread listed alot of server monitoring and statistics gathering articles/guides.

    That's what server monitoring is for. I usually write my own scripts for some of this which monitor php-fpm status output and can email me at set intervals the stats output when they reach certain preset thresholds. Nixststats can do some form of visual monitoring Monitor PHP-FPM with Nixstats as can Nginx Amplify Monitoring PHP Applications with NGINX Amplify. I should add these 2 to the list I usually quote.
     
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  14. elargento

    elargento Member

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    123.09beta01. I just installed it 7 hours ago. When I got the error, I upgraded to PHP 7.1 version and the bad gateway gone

    If I do fpmrestart I don't get any errors

    After delete the files I get a warning:
    Code:
    [[email protected] public]# fpmrestart
    Gracefully shutting down php-fpm  done
    Starting php-fpm [18-Feb-2018 17:47:55] NOTICE: PHP message: PHP Warning:  Cannot load module 'redis' because required module 'igbinary' is not loaded in Unknown on line 0
     done
    
    I reinstalled redis and I don't get the warning anymore.

    Is it real I have to do all this just because the limited value affecting the import script and stopping it isn't being logged?
     
  15. eva2000

    eva2000 Administrator Staff Member

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    You generally do all this is you want to monitor your server software usage statistics to really KNOW what's going on on your server. So if you monitor everyday, you know what is normal and what is not normal - that is probably 75% of optimisation tuning process as how else would you know whether or not settings changes actually do anything positive or not ? :)

    Oh and for Nixstats PHP-FPM - How to configure PHP-FPM Status Monitoring with Nixstats
     
  16. elargento

    elargento Member

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    The problem is that you can't set alerts on Nixstats based on specific conditionals so I'm in the same situation, I need to know what value reached the top and is causing this
     
  17. eva2000

    eva2000 Administrator Staff Member

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    Yeah you'd need to custom script for that i.e. i send alerts to email and push notifications to mobile via pushbullet. There's probably other 3rd party monitoring that can do such alerts out there but I haven't really looked.
     
  18. elargento

    elargento Member

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    Now I understand why sysadmin is a loooong way learn path.
    Just to give me an idea, I should play with the following PHP processes variables until the error will gone?
    listen queue:
    max listen queue:
    listen queue len:
    idle processes:
    active processes:
    total processes:
    max active processes:
    max children reached:

    I'm trying to understand where I should focus on.
    I'm surprised no monitoring tool offer this kind of alert based on process stats
     
  19. eva2000

    eva2000 Administrator Staff Member

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    Learning is really 80% reading and practising what you read. Becoming an expert is about reading and practising more than normal folks and making more mistakes than normal folks and learning from them :D So don't be afraid of reading alot and making alot of mistakes ;)

    As to where to focus, the PHP-FPM status output metrics are explained fully at PHP-FPM - CentminMod.com LEMP Nginx web stack for CentOS so I'll let you learn through trial and error - best way to learn !
    Nagios monitoring has such I believe but probably a more complicated monitoring setup for noob folks compared to simple standalone scripts.
     
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  20. elargento

    elargento Member

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    I guess I will have to run the import several times until I'll get rid of that bad gateway error by modifying PHP-FPM values. Let's see how it goes! :asshat:
     
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