What is pm2 in Nodejs

PM2: A production process manager for Node. js applications that has a built-in load balancer. PM2 enables you to keep applications alive forever, reloads them without downtime, helps you to manage application logging, monitoring, and clustering.

What is PM2 Linux?

PM2 is an acronym of Process Management Module which is used to run and manage Node. … When a process goes down, PM2 will automatically restart the service and make it Live. PM2 works on Linux, Windows, and macOS. We can enable the process to automatically start on system boot up or while restart.

What is PM2 programming?

PM2 is a production process manager for Node. js applications with a built-in load balancer. It allows you to keep applications alive forever, to reload them without downtime and to facilitate common system admin tasks.

Why is PM2 used?

Pm2 is a process management module for Node. … It is used to start and monitor Node. js application so if the application goes down ( for example if the node index. js process dies) the process manager will restart the app immediately making it available once again.

What is node mon?

nodemon is a tool that helps develop node. js based applications by automatically restarting the node application when file changes in the directory are detected. … nodemon is a replacement wrapper for node . To use nodemon , replace the word node on the command line when executing your script.

Is PM2 necessary?

2 Answers. Usually there is no point in using pm2 inside of a docker. Both PM2 and Docker are process managers and they both can do log forwarding, restart crashed workers and many other things.

How do I run a PM2 node?

Create a Safe Account to Run Your Code. …
Login as the Safe User. …
Install GIT. …
Install Latest Node. …
Give Safe User Permission To Use Port 80. …
Use NPM To Install A Package Called PM2. …
Create a Simple Node App.

How do I enable PM2?

$ pm2 startup [PM2] You have to run this command as root. …
sudo su -c “env PATH=$PATH:/home/unitech/.nvm/versions/node/v14.3/bin pm2 startup <distribution> -u <user> –hp <home-path>
$ pm2 unstartup.

How run next JS with PM2?

Install Nginx.
Install Yarn.
Install PM2.
Use Git to fetch our Next.js project from Github.
Run our project with PM2 and serve a browsable version with Nginx.
Run PM2 automatically whenever we boot/reboot the machine.

What is node in node JS?

Node. js is an open-source server side runtime environment built on Chrome’s V8 JavaScript engine. It provides an event driven, non-blocking (asynchronous) I/O and cross-platform runtime environment for building highly scalable server-side application using JavaScript. Node.

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Who uses PM2?

Who uses PM2? 105 companies reportedly use PM2 in their tech stacks, including Software Engineering, hogangnono, and Winds.

How do I know if PM2 is running?

pm2 start app. js –name “my-api”
pm2 start web. js –name “web-interface”
pm2 stop web-interface.
pm3 restart web-interface.

What is Mongoose in node JS?

Mongoose is an Object Data Modeling (ODM) library for MongoDB and Node. js. It manages relationships between data, provides schema validation, and is used to translate between objects in code and the representation of those objects in MongoDB.

What is callback in node JS?

Callback is an asynchronous equivalent for a function. A callback function is called at the completion of a given task. Node makes heavy use of callbacks. … This makes Node. js highly scalable, as it can process a high number of requests without waiting for any function to return results.

What is express in node JS?

js, or simply Express, is a back end web application framework for Node. js, released as free and open-source software under the MIT License. It is designed for building web applications and APIs. It has been called the de facto standard server framework for Node.

What does pm2 reload do?

With reload, pm2 restarts all processes one by one, always keeping at least one process running. It also states that: If the reload system hasn’t managed to reload your application, a timeout will fallback to a classic restart.

Is pm2 secure?

Is pm2 safe to use? The npm package pm2 was scanned for known vulnerabilities and missing license, and no issues were found. Thus the package was deemed as safe to use.

What is pm2 Plus?

PM2 Plus allows you to see the logs of all of your applications managed by pm2 in one place in the cloud. No need to ssh into your servers and use pm2 logs anymore, everything is on the web interface. Checkout the realtime logs.

Does PM2 need nginx?

Yes and you should. Nginx can run on port 80. PM2 can run on port 3000 (or whatever port) which can then manage traffic within the instances of the app. gzip alone will make a huge difference in the app end user performance.

Is Node js good for production?

Node. JS is ideal for fast, lightweight, real-time web applications such as audio/video streaming, browser games, chats, collaboration tools social media, time trackers, and much more. For this reason, many companies decide to use Node. js in production.

Is node a server?

Node. js is an open source server environment. Node. js uses JavaScript on the server.

How do I stop a pm2 server?

pm2 start app. js –name “my-api”
pm2 start web. js –name “web-interface”
pm2 stop web-interface.
pm3 restart web-interface.

How do I restart pm2?

Restart at cron time. Via CLI: …
Restart on file change. PM2 can automatically restart your application when a file is modified in the current directory or its subdirectories: …
Restart Delay. …
No Auto Restart. …
Skip Auto Restart For Specific Exit Codes. …
Exponential Backoff Restart Delay.

How do I view pm2 logs?

Type pm2 log in a shell and you get an overview of the last 15 log lines and the last 15 error lines in realtime. At the top of these log lines, the location of your logfile is shown. You can also type pm2 log –lines 1000 to show more lines, in this case 1000.

Why does pm2 auto restart?

There is something called “Exponential Backoff Restart Delay” which PM2 explains as: Instead of restarting your application like crazy when exceptions happens (e.g. database is down), the exponential backoff restart will increase incrementaly the time between restarts.

Does pm2 restart after reboot?

One of PM2’s key features is support for a startup script (generated dynamically based on the default init system on your server), that restarts PM2 and your processes at every server restart. … When the server restarts, it will automatically restart PM2, which will then restart all the Node.

Does pm2 auto restart on file change?

Auto restart apps on file change If –watch is enabled, stopping it won’t stop watching: pm2 stop 0 will not stop watching.

What is chocolatey in node JS?

Chocolatey is a Windows Package Manager, is manages packages. You don’t need Chocolatey in order to do web development. Having Chocolatey makes the automated installation and updating of the applications on your machine easier.

What is event loop in Nodejs?

Event loop is an endless loop, which waits for tasks, executes them and then sleeps until it receives more tasks. The event loop executes tasks from the event queue only when the call stack is empty i.e. there is no ongoing task. The event loop allows us to use callbacks and promises.

Who owns Nodejs?

Original author(s)Ryan DahlStable release17.3.0 / December 17, inC, C++, JavaScriptOperating systemz/OS, Linux, macOS, Microsoft Windows, SmartOS, FreeBSD, OpenBSD, IBM AIX