pm2 nodejs installation

PM2 is a modern production process manager and process daemon designed specifically for Node.js applications. It can manage application processes, logs, and status, and supports vertical and horizontal expansion.

This article will introduce how to install PM2 and how to use PM2 to manage Node.js applications.

Prerequisites
Before you start, you need to ensure that the following conditions are met:

You have installed Node.js
You are already familiar with the Linux command line interface (CLI) . If you are a developer using a Windows operating system, open a command prompt in a PowerShell window.

Installing PM2
PM2 can be installed through the npm package manager and can be installed globally or locally.

Global installation
Global installation of PM2 You can use the pm2 command in any directory of the system. To install globally, use the following command:

sudo npm install pm2 -g

local installation
In some cases, you may only need to use PM2 in the current project. In this case you can install it locally using the following command:

npm install pm2

In this case you need to start the application using the following command:

./node_modules/.bin/pm2 start app.js

In some cases, you may need to use the sudo command to install PM2 or start the application.

Manage applications using PM2
Once PM2 is installed, you can start your application using the following command:

pm2 start app.js

This command will Start a new process named app.js. If your application requires additional options, add them after the command.

For example, if your application requires a configuration file named config.json, you can start it with the following command:

pm2 start app.js -- --config=config .json

PM2 also provides many other parameters and options, such as --watch and --ignore-watch, which can cause your application to automatically restart when files change.

Use the following command to list the process:

pm2 list

You can also use the following command to view the details of the process:

pm2 describe app

If you want to delete the process from PM2, you can use the following command:

pm2 delete app

If your application is running in production and you need to The PM2 process is automatically started after the system is restarted. You can use the following command to generate a standard system startup script:

pm2 startup

This command will generate a startup script for you. You need to place the script in the correct directory depending on your operating system. For example, in Ubuntu and Debian, you need to place this script in the /etc/init.d/ directory.

Summary
In this article, we introduced how to install PM2 and how to use PM2 to manage Node.js applications. We looked at some basic commands of PM2 and learned how to start, stop, and restart the application. If you want to dive into more details about PM2, please visit the official documentation.

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