2018-3-19 Linux Learning Notes

12.21 PHP-FPM's Pool

• Requirements background:
  Suppose Nginx has multiple sites, each with its own pool, so that when a site has a problem (such as a 502 error), other sites are unaffected.
• The following is an example of setting up [www] and [Karu] two pool as a case study.
  Specific procedures:

• Vim/usr/local/php-fpm/etc/php-fpm.conf #在 [Global] section increased
  Include = etc/php-fpm.d/*.conf

• mkdir/usr/local/php-fpm/etc/php-fpm.d/
• cd/usr/local/php-fpm/etc/php-fpm.d/
• Add two new profiles Www.con and karu.com and edit as follows:

• Vim www.conf #内容如下
  [WWW]
  Listen =/tmp/php-fcgi.sock
  listen.mode=666
  user = PHP-FPM
  Group = PHP-FPM
  PM = dynamic
  Pm.max_children = 50
  Pm.start_servers = 20
  Pm.min_spare_servers = 5
  Pm.max_spare_servers = 35
  Pm.max_requests = 500
  Rlimit_files = 1024

• Vim karu.conf #内容如下
  [Karu]
  Listen =/tmp/karu.sock
  listen.mode=666
  user = PHP-FPM
  Group = PHP-FPM
  PM = dynamic
  Pm.max_children = 50
  Pm.start_servers = 20
  Pm.min_spare_servers = 5
  Pm.max_spare_servers = 35
  Pm.max_requests = 500
  Rlimit_files = 1024

• /usr/local/php-fpm/sbin/php-fpm-t #检测是否有语法错误
• /ETC/INIT.D/PHP-FPM Restart #重启php-fpm service for configuration to take effect
  

12.22 php-fpm Slow Execution log [very useful]

• Requirements background:
  For sites with LNMP architecture, if the site is found to be slow, you can use PHP-FPM's slow execution log to troubleshoot the mitigation issues caused by PHP.
• The specific steps to implement are as follows:
• Vim/usr/local/php-fpm/etc/php-fpm.d/karu.conf
• At the end, add the following:
  Request_slowlog_timeout = 1 #记录php执行超过1秒的操作
  Slowlog =/usr/local/php-fpm/var/log/www-slow.log #定义慢执行日志所在位置
  
• /usr/local/php-fpm/sbin/php-fpm-t
• /ETC/INIT.D/PHP-FPM Reload
• Simulate a slow-executing PHP:
• vim/data/wwwroot/default/sleep.php #写入如下内容
  <?php
  echo "Test slow Log";
  Sleep (2);
  echo "Done";
  ?>

• Test results:
  Curl-x127.0.0.1:80 default/sleep.php
  Cat/usr/local/php-fpm/var/log/www-slow.log
  

12.23 Open_basedir

• (1) The role of Open_basedir in PHP-FPM is to restrict PHP activity in the specified directory to improve the security of the site.
• The specific configuration is as follows:
  Vim/usr/local/php-fpm/etc/php-fpm.d/karu.conf
• Add the following:
  php_admin_value[open_basedir]=/data/wwwroot/default:/tmp/
• /usr/local/php-fpm/sbin/php-fpm-t
• /ETC/INIT.D/PHP-FPM Reload

• Test:
  Curl-x127.0.0.1:80 default/sleep.php
  Curl-x127.0.0.1:80 Default/sleep.php-i
  

• (2) Configuring the PHP-FPM error log

• The steps are as follows:
  Vi/usr/local/php-fpm/etc/php.ini
  Display_errors = Off #不让其他人能通过浏览器看到错误信息
  Log_errors = on #打开错误日志记录功能
  Error_log =/usr/local/php-fpm/var/log/php_errors.log #错误日志存放位置
  error_reporting = E_all & ~e_deprecated & ~e_strict #定义错误日志级别

• Edit Karu.conf again
  Vim/usr/local/php-fpm/etc/php-fpm.d/karu.conf
• Deliberately write it wrong, such as:
  php_admin_value[open_basedir]=/data/wwwroot/asdefault:/tmp/
• /usr/local/php-fpm/sbin/php-fpm-t

• /ETC/INIT.D/PHP-FPM Reload

• Test:
  Curl-x127.0.0.1:80 default/sleep.php
  Cat/usr/local/php-fpm/var/log/php_errors.log #查看错误日志
  12.24 PHP-FPM Process Management
• There are process management related configuration items in the PHP-FPM configuration file, such as:
  Vim/usr/local/php-fpm/etc/php-fpm.d/karu.conf
  
• The specific meanings are as follows:
• PM = dynamic
  Dynamic process management can also be static. Note that when it is static, the following items do not take effect!
• Pm.max_children = 50
  Maximum number of child processes
• Pm.start_servers = 20
  Number of processes that will start when the service is started
• Pm.min_spare_servers = 5
  Defines the minimum number of child processes in the idle period, and if this value is reached, the PHP-FPM service automatically derives the new child process.
• Pm.max_spare_servers = 35
  Defines the maximum number of child processes in the idle period, or, if higher than this value, begins to clean up idle child processes.
• Pm.max_requests = 500
  Defines the maximum number of requests processed by a child process, meaning that at most one php-fpm child process can handle so many requests, and when this value is reached, it exits automatically.

2018-3-19 Linux Learning Notes