What is PHP-FPM? Introduction to PHP-FPM management and configuration

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What is PHP-FPM?

PHP-FPM is the process manager for FastCGI.

Features of PHP-FPM

• Supports advanced process management functions for smooth stop and start

• Dynamic and static sub-processes Generate

• slow logs to record the abnormal slowness caused by script running

• You can listen to different ports and use different php.ini

Management and configuration of PHP-FPM

PHP-FPM management

master The master process understands the following signals:

• INT,TERM Terminate immediately

• QUIT Terminate smoothly

• USR1 Reopen the log file

• USR2 Gracefully reloads all worker processes and reloads configuration and binary modules

# 查看 php-fpm 用户
ps aux | grep php-fpm

# 查看 php-fpm 进程 pid
ps -ef | grep php-fpm

# 启动 php-fpm
php-fpm -D

# 关闭 php-fpm
kill -INT [pid]

# 重启 php-fpm
kill -USR2 [pid]

ps is a snapshot showing the current process.

PHP-FPM configuration

/etc/php-fpm.d The folder contains the configuration of all process pools, in the main configuration file/etc/ There is the following line in php-fpm.conf:

include=/etc/php-fpm.d/*.conf

The main configuration file of php-fpm.conf contains global configuration, and the sub-configuration is the configuration of different process pools, such as www.

Global configuration

# s 秒，m 分，h 小时，d 天

# 子进程在 emergency_restart_interval 设定的时间内收到该参数设定次数的 SIGSEGV 或者 SIGBUS退出信息号，则FPM会重新启动
emergency_restart_threshold 10
# 平滑重启的间隔时间：
emergency_restart_interval 1m
# 子进程接受主进程复用信号的超时时间
process_control_timeout 10s

Process pool configuration

# 接收 FastCGI 请求的地址
listen： 'ip:port', '/path/to/unix/socket'

# 设置进程管理器如何管理子进程
pm: static 固定数量, ondemand 进程在有需求时才产生, dynamic 动态设置

static and dynamic configuration

If the memory is relatively small and the concurrency is not very large, you can consider using it dynamic method, which can control the total memory consumed by php-fpm.

When concurrency is high or traffic fluctuates greatly, using static can achieve a faster response than dynamic under high concurrency.

Number of configurable processes = php-fpm configurable memory / (memory footprint of php-fpm child process * 1.2)

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