Process management library in PHP8.0: Supervisor

With the continuous development of the PHP language, more and more functions and libraries are introduced into the developer's toolbox. One of the important functions is process management. In the PHP8.0 version, Supervisor is a very powerful process management library, which can help us easily start, stop, monitor, and restart processes, and maintain the stable operation of the process.

What is Supervisor?

Supervisor is a process management tool written in Python that allows you to easily start, stop, monitor and restart processes. The advantage of Supervisor is that it is easy to use and can be expanded. It can monitor the process in detail and can automatically restart when the process exits unexpectedly or hangs. In addition, Supervisor also has a web interface that can easily manage processes.

Installation of Supervisor

In Debian/Ubuntu system, you can use the following command to install Supervisor:

sudo apt-get install supervisor

In CentOS In the system, you can use the following command to install Supervisor:

sudo yum install supervisor

After installation, you need to start the Supervisor service:

sudo service supervisor start

At this time you can view the Supervisor web interface at http://127.0.0.1:9001.

How to use Supervisor?

Before using Supervisor, you need to add the process information you want to manage in the Supervisor configuration file. By default, the Supervisor configuration file is located in /etc/supervisor/supervisord.conf. You can add your corresponding process configuration information to this file.

In this file, you need to use the "[program:xxx]" syntax to define your process, where "xxx" is the name of the process you defined. For example, you can add the following configuration:

[program:example]
command=/usr/bin/php /path/to/your/php/script.php
process_name=%( program_name)s
autostart=true
autorestart=true
user=apache
redirect_stderr=true
stdout_logfile=/var/log/example.log

In this configuration , we defined a process named "example", which represents the PHP script with the startup path "/path/to/your/php/script.php", and set the automatic startup, automatic restart, and running user as " apache" and output standard output to the file "/var/log/example.log". You can configure more parameters according to your needs, such as cpu affinity, process environment variables, etc.

After the configuration is completed, you need to reload the Supervisor configuration information through the following command:

sudo supervisorctl reread
sudo supervisorctl update

At this time, you can go to the Supervisor web You can view the status of the process on the interface and perform operations such as start, stop, and restart.

Summary

Supervisor is a powerful process management library that can help us easily manage processes and maintain the stable operation of the process. At the same time, it can provide a Web interface to facilitate our management. Whether in a production environment or a development environment, Supervisor is a very useful tool. Pay attention to the configuration parameters during use to ensure the stability of the process.

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