Supervisor: A Robust Process Control System for PHP Applications
Supervisor is a powerful tool for managing background processes, a necessity for PHP developers handling long-running tasks, queue workers, and other background jobs. This guide details Supervisor setup, PHP application integration, and comprehensive configuration for optimal performance.
Supervisor excels at managing background tasks by:
It's particularly beneficial for PHP projects employing:
Ubuntu/Debian:
sudo apt update sudo apt install supervisor
CentOS/RedHat:
sudo yum install epel-release sudo yum install supervisor
Post-installation, activate and enable Supervisor:
sudo systemctl start supervisord sudo systemctl enable supervisord
Supervisor utilizes configuration files (typically located in /etc/supervisor/conf.d/
) to manage individual programs.
Basic Configuration Example:
Create /etc/supervisor/conf.d/my_php_worker.conf
with this content:
[program:my_php_worker] command=php /path/to/worker.php autostart=true autorestart=true stderr_logfile=/var/log/my_php_worker.err.log stdout_logfile=/var/log/my_php_worker.out.log
The --tries=3
option (within the command
directive) limits restart attempts to three before failure.
Apply the configuration:
sudo supervisorctl reread sudo supervisorctl update sudo supervisorctl start my_php_worker:*
Here's a detailed breakdown of Supervisor configuration options:
command
: The command to execute. Example: command=php /path/to/worker.php
autostart
: Automatically starts the program with Supervisor. Values: true
(default), false
. Example: autostart=true
autorestart
: Automatic restart on failure. Values: true
, false
, unexpected
. Example: autorestart=unexpected
startsecs
: Minimum runtime (seconds) before a process is considered started. Default: 1. Example: startsecs=5
startretries
: Maximum restart attempts before failure. Default: 3. Example: startretries=5
exitcodes
: Acceptable exit codes preventing restarts. Default: 0,2. Example: exitcodes=0,1
stopwaitsecs
: Time (seconds) to wait for graceful shutdown before forceful termination. Default: 10. Example: stopwaitsecs=20
redirect_stderr
: Redirect standard error to standard output. Values: true
, false
(default). Example: redirect_stderr=true
stdout_logfile
/ stderr_logfile
: Log file paths for standard output and error. Example: stdout_logfile=/var/log/my_program.out.log
stdout_logfile_maxbytes
/ stderr_logfile_maxbytes
: Maximum log file size before rotation. Default: 50MB. Example: stdout_logfile_maxbytes=10MB
stdout_logfile_backups
/ stderr_logfile_backups
: Number of rotated log files to retain. Default: 10. Example: stdout_logfile_backups=3
user
: System user to run the program as. Example: user=www-data
environment
: Environment variables. Example: environment=APP_ENV="production",DB_HOST="localhost"
priority
: Start order (lower values start first). Default: 999. Example: priority=100
directory
: Working directory. Example: directory=/path/to/your/app
stopasgroup
: Send stop signal to the process and its children. Values: true
, false
(default). Example: stopasgroup=true
killasgroup
: Forcefully kill the process and its children after stopwaitsecs
. Values: true
, false
(default). Example: killasgroup=true
Laravel Queues: Manage queue:work
command for reliable job processing.
sudo apt update sudo apt install supervisor
Scheduled Tasks: Replace cron for more robust scheduled script execution.
sudo yum install epel-release sudo yum install supervisor
Long-Running Scripts: Manage persistent scripts like WebSocket servers.
sudo systemctl start supervisord sudo systemctl enable supervisord
Ensure Supervisor starts on system boot:
Enable Supervisor service: sudo systemctl enable supervisord
Start the service (if needed): sudo systemctl start supervisord
stdout_logfile_maxbytes
and stdout_logfile_backups
.environment
directive to manage variables.Supervisor is an essential tool for PHP developers managing background processes. This guide provides a comprehensive introduction to its installation, configuration, and practical applications, ensuring reliable and efficient task management for your PHP projects.
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