Process Manager 2 (PM2)

PM2, or Process Manager 2, is a popular and versatile process manager for Node.js applications. It is designed to simplify the deployment and management of Node.js processes in production environments. Why using PM2 :

• Start and Stop Processes: PM2 allows you to start, stop, and restart Node.js applications easily. It ensures that your application stays online, restarting automatically if it crashes.


• Process Monitoring: PM2 provides a dashboard that gives you real-time information about the health and performance of your running processes.crashes.

• Rolling Reloads: PM2 supports zero-downtime deployment by using a rolling reload strategy. This means that when you deploy updates to your application, PM2 restarts processes one at a time, preventing downtime for end-users.

• Centralized Logging: PM2 collects and centralizes logs from your Node.js applications, making it easy to review and troubleshoot issues.


• Log Rotation: PM2 handles log rotation, preventing log files from becoming too large and managing them to conserve disk space.

• Load Balancing: PM2 can run multiple instances (or clusters) of your application to distribute incoming traffic and balance the load. This improves the performance and reliability of your application.

• Environment Variables: PM2 allows you to set and manage environment variables for your Node.js processes.


• Different Environments: PM2 supports different environments (development, production, etc.), allowing you to configure and manage processes differently based on the environment.

• System Startup: PM2 provides a feature to generate startup scripts, allowing your Node.js applications to automatically start when the server boots.

• PM2 Modules: PM2 supports the use of modules, which are additional features and tools that extend its functionality. Examples include monitoring tools, log management solutions, and more.

• Integration with Nginx: PM2 is often used in conjunction with Nginx or other web servers. Nginx can act as a reverse proxy, forwarding requests to the Node.js application processes managed by PM2.


• Integration with Monitoring Tools: PM2 integrates with monitoring tools, allowing you to track the performance of your applications over time.

• Scale Horizontally: PM2 enables horizontal scaling by allowing you to run multiple instances of your application. This can be particularly useful for handling increased traffic.

Overall, PM2 is a powerful tool for managing Node.js processes in production, providing features for deployment, monitoring, scaling, and ensuring the reliability of your applications.Next page we will covered PM2 commands.