Multiple server with Nginx

Part 1 - Get server instance

• Create a Ubuntu server with any provider like AWS, Linode, DigitalOcean, etc.

• Add a ssh key.

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Part 2 - Get domain name

• Get a domain name from any provider like BigRock, Google, etc.

• Add an A record with the ipv4 address of the server.

• You can add multiple A records with different subdomains with the same ipv4 address.

Add the records in your domain provider DNS only. Don't create new domain in the server provider.

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Part 3 - Server connection from local machine

• Login via ssh.

• Run the following commands,
  

sudo apt update

sudo apt upgrade -y

• Reboot your instance.

• Login again via ssh.

• Install Node.js via,
  

curl -sL https://deb.nodesource.com/setup_12.x | sudo -E bash -

sudo apt install nodejs

node --version

• Create the folder(s) of your server and write the code for it.

• Sample server code is,
  

const express = require('express')
const app = express()
const port = 3000

app.get('/', (req, res) => {
  res.send('Hello World!')
})

app.listen(port, () => {
  console.log(`Example app listening at http://localhost:${port}`)
})

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Part 4 - Install pm2

sudo npm i pm2 -g

pm2 start <server-file-name> --name "<process name>"

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Part 5 - Setup ufw firewall

sudo ufw enable

sudo ufw status

sudo ufw allow ssh (Port 22)

sudo ufw allow http (Port 80)

sudo ufw allow https (Port 443)

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Part 6 - Install NGINX and configure

sudo apt install nginx

sudo nano /etc/nginx/sites-available/default

• Sample server block looks like,

server {
    server_name <domain-name>;

    location / {
        proxy_pass http://localhost:<port of server>;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }
    listen 80;
}

• Add this to show default page for all the other URLs,

server {
    server_name <IPV4 address of the server>;
    root /var/www/html;
    index  index.nginx-debian.html;
    listen 80 default_server; 
}

• Check nginx config via,

sudo nginx -t

• Restart nginx via,

sudo service nginx restart

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Part 7 - Add SSL with Certbot

• Follow the instructions at Offical website of certbot.