How to Install and Set Up PM2 on Linux Servers – Guide
Deployment is one of the most crucial and conclusive stages of software development. A proper deployment strategy is vital to providing the best user experience while using your services efficiently. However, this process also brings with it its own set of challenges. Node.js, the open source JavaScript runtime, is a popular choice for building your app’s back-end infrastructure, allowing you to run JavaScript outside of web browsers. But what if your Node.js app crashes in production?
What is PM2 and why do you need it?
PM2 is a daemon process manager that allows you to keep Node.js applications active forever, reload them without downtime, manage application logging, monitoring and clustering. Imagine that your Node.js web server crashed due to some runtime error. Without using something like PM2, you would have to manually track the status of your app periodically and restart it whenever it goes down. PM2 helps automate this process and keeps your application online 24 hours a day, 7 days a week, even if something goes wrong.
Installing PM2 on Linux Servers
Before installing PM2, make sure you have Node.js and NPM installed on your Linux server to download the PM2 package from the Node Package Manager repositories. After getting Node.js up and running on your server, install PM2 by running this command: npm install -g pm2 The -g flag in the above command means Global and allows you to use PM2 in all your Node.js apps. You may need to add sudo at the beginning of the command, depending on your user account permissions.
Running P-Node Applications
Once the installation process is complete, navigate to the directory where your Node.js application resides using the cd command. Within the project directory, you can run a JavaScript file using PM2 with the command given below pm2 initial filename. For example, if the entry point to your Node.js app resides within the index.js file, this is How to run the file. starting index pm2. If you need to make any changes to your application, you can do so using a command-line text editor to edit the code and then restart your PM2 application instance with this command pm2 reset file name. To completely terminate the application, use this command pm2 stop file name. Instead of running a single file with PM2, you can also run NPM scripts present in the package.json file of your Node.js application. For example, if you want to run the startup script, structure the command this way pm2 start npm –name – yes
Viewing Logs and Statistics
To monitor errors that might arise during runtime, PM2 provides an option to check the logs your application generates. See How to view them pm2 records eu: srt: js: js: js: js: M2me: srt: js: js: js: js: js: M2 pm2 logs To monitor all running processes, the PM2 comes with a handy terminal-based dashboard for observing CPU and RAM usage, which you can access with this command: pm2 monit To view the rest of the details and metadata, such as application version, number of restarts, uptime, script arguments, and more: pm2 show
Easily deploy Node.js applications to production
Using a process manager like PM2 can greatly reduce the overhead of having to constantly monitor the status and uptime of your Node.js application. With its built-in load balancer, you can expect greater performance and reliability for your services.
Final note
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