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PHP Very slow

Discussion in 'Nginx, PHP-FPM & MariaDB MySQL' started by Oxide, Sep 6, 2016.

  1. Oxide

    Oxide Active Member

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    Mar 19, 2015
    Ratings:
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    Local Time:
    3:13 AM
    Hello.

    After installing a fresh install of "123.09beta01" on a OVH VPS. I noticed there are some really bad slow downs, sometimes a php document can take up to 5-10 seconds to respond.

    Code:
    [root@135135~]# php -v
    PHP 7.0.9 (cli) (built: Sep  1 2016 19:53:14) ( NTS )
    Copyright (c) 1997-2016 The PHP Group
    Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies
        with Zend OPcache v7.0.9, Copyright (c) 1999-2016, by Zend Technologies
    [root@135135~]# php --ini
    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/a_customphp.ini,
    /etc/centminmod/php.d/curlcainfo.ini,
    /etc/centminmod/php.d/geoip.ini,
    /etc/centminmod/php.d/igbinary.ini,
    /etc/centminmod/php.d/imagick.ini,
    /etc/centminmod/php.d/mailparse.ini,
    /etc/centminmod/php.d/memcache.ini,
    /etc/centminmod/php.d/memcached.ini,
    /etc/centminmod/php.d/redis.ini,
    /etc/centminmod/php.d/zendopcache.ini
    
    I checked php error log, located in /var/log/php-fpm/www-error.log
    The only error I see that happen multiply times, was this:
    Code:
    [05-Sep-2016 16:12:43] WARNING: [pool www] server reached max_children setting (4), consider raising it

    However, this last occurred a couple of hours ago and the slow downs are still occurring.

    HTML Files seems to respond instantly. I believe it's PHP, since something such as Geo IP takes forever to finish. Even when the query is cached, even a simple if(else) rule would take 4-5 seconds to respond.

    Are there any help to trouble shoot this issue? I'm aware centminmod is fully up to the user to optimize etc, so I am asking the community if eva doesn't want to help :3

    Code:
    [root@135135 log]# uname -a
    Linux 135135.ovh.net 3.10.0-327.28.3.el7.x86_64 #1 SMP Thu Aug 18 19:05:49 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
    
     
  2. eva2000

    eva2000 Administrator Staff Member

    30,191
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    May 24, 2014
    Brisbane, Australia
    Ratings:
    +10,142
    Local Time:
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    Nginx 1.13.x
    MariaDB 5.5
    Any 502/504 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.

    Slowness, 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 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 http://centminmod.com/phpfpm.html#browserstatus and https://community.centminmod.com/threads/pm-max_children.479/ and https://community.centminmod.com/threads/warning-pool-www-server-reached-max_children-setting-50-consider-raising-it.791/ which outlines the official PHP-FPM config documentation as well.

    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 :)