How to start nodejs on the server

Starting Node.js on the server allows us to deploy Node.js applications in Linux or Unix systems to provide services to users. Configuring the Node.js server requires us to master basic Linux commands and Node.js programming knowledge.

The following are the steps to start Node.js on the server:

1. Install the Node.js environment

In Linux or Unix systems, we need to use Bash Shell or Terminal to execute commands. Enter the following command in the command line:

sudo apt-get update
sudo apt-get install nodejs

Here we use the official PPA (Personal Package Archives) repository of Node.js. PPA is a third-party software repository for Ubuntu or Debian.

The Node.js repository provides an easy way to install Node.js. First, we update the repository and package lists. Then, we use the apt-get command to install nodejs and npm.

2. Create a Node.js application

Next, we create a simple Node.js application. Enter the following command in the command line:

mkdir mynodeapp
cd mynodeapp
touch app.js

Here we have created a directory called "mynodeapp" and created an empty JavaScript file named "app.js".

Next, we open the app.js file and type the following code:

const http = require('http');
const hostname = '127.0.0.1';
const port = 3000;
const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end('Hello World
');
});
server.listen(port, hostname, () => {
  console.log(`Server running at http://${hostname}:${port}/`);
});

Here we create a server using Node.js’ built-in http module. We bind the server to localhost and port number 3000.

Then a callback function is created, which will return the 'Hello World' string. Finally, we let the server listen for connections and output the line "Server running at http://${hostname}:${port}/" to the console.

3. Start the Node.js application on the server

In Linux, we use the NODE command to start the Node.js application. We entered the following command on the previous command line:

node app.js

This will start our application and bind the server to port 3000. If everything goes well, we will see the line "Server running at http://${hostname}:${port}/" on the console.

Next, we can use the browser to access http://127.0.0.1:3000/ and see the string "Hello World".

4. Resident process

We can also use a resident process to run Node.js applications to ensure that even if we close the terminal, the application is still running in the background.

We can use the following command to start the Node.js application in the background:

nohup node app.js &

The nohup command here will cause the application to continue running and ignore the terminal closing operation. The last "&" character puts the application into the background.

5. Use PM2 to manage applications

PM2 is a popular Node.js process manager that can manage multiple Node.js applications and monitor their running status.

To use PM2 to manage our applications, we need to install it first. Enter the following command in the command line:

sudo npm install -g pm2

Next, we can start the Node.js application in the background using the following command:

pm2 start app.js

We can use the following command to see our application running Status:

pm2 list

We can also use the following command when we need to restart the application:

pm2 restart app.js

Finally, we can stop our application using the following command:

pm2 stop app.js

Pass Learning the above basic commands, we can start the Node.js application on the server and use PM2 to manage the application. This gives us a reliable and easy-to-manage way to serve Node.js to our users.

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