PM2 for process management in Node.js - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is PM2 in Node.js?

PM2 is a process manager for Node.js applications that helps keep apps alive, reload them without downtime, and manage logs easily.

beginner

How do you start an app with PM2?

Use the command pm2 start app.js to launch your Node.js app with PM2 managing it.

beginner

What command shows the list of running processes in PM2?

Use pm2 list to see all apps PM2 is managing, their status, and resource use.

intermediate

How does PM2 help with zero downtime reloads?

PM2 can reload apps gracefully using pm2 reload app_name, restarting processes without stopping service.

intermediate

What is the purpose of the ecosystem.config.js file in PM2?

It is a config file where you define app settings, environment variables, and multiple app processes for PM2 to manage.

Which PM2 command starts a Node.js app?

A pm2 start app.js

B pm2 run app.js

C pm2 launch app.js

D pm2 execute app.js

The correct command to start an app with PM2 is pm2 start app.js.

How can you view all running processes managed by PM2?

A pm2 show

B pm2 list

C pm2 status

D pm2 ps

Use pm2 list to see all running processes and their status.

What does pm2 reload app_name do?

A Reloads the app without downtime

B Restarts the app with downtime

C Stops the app immediately

D Deletes the app from PM2

Reloading with PM2 restarts the app gracefully without downtime.

Which file is used to configure multiple apps in PM2?

A pm2.config.js

B pm2.json

C ecosystem.config.js

D app.config.js

The ecosystem.config.js file holds configuration for apps managed by PM2.

What is one main benefit of using PM2?

A Compiling JavaScript

B Writing code faster

C Creating UI components

D Managing app processes and keeping them alive

PM2 helps keep Node.js apps running and manages their processes.

Explain how PM2 helps keep a Node.js app running smoothly in production.

Think about what happens if your app crashes or needs updating.

Describe the steps to start, monitor, and reload a Node.js app using PM2.

Consider the basic PM2 commands for app lifecycle.