AWS VPC EC2 inter communication

script_and_code

sudo su
apt update
apt upgrade -y
apt install nginx -y
curl -sL https://deb.nodesource.com/setup_16.x | sudo -E bash -
apt install nodejs -y
apt install build-essential -y
npm install pm2@latest -g
cd /var/www/html
mkdir app
cd app
////////////
setup node js app

npm init -y
npm install --save express
npm install --save body-parser
npm install axios
npm install cors
/////////////
nano index.js
//////////////////////
const express = require('express')
const bodyParser = require('body-parser');
const cors = require('cors');
const axios = require('axios');

const app = express();
const port = 3000;



app.use(cors());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());

app.get('/myapi', (req, res) => {
  res.send({success:true,message:'This is my api'})
});

app.get('/handleFromOther',(req,res)=>{
  res.send({success:true,message:'From ec2_put_index_of_instance'})
})

app.get('/otherapi', (req, res0) => {
axios
  .get('http://private_ip_of_other_instance/handleFromOther')
  .then(res => {
    res0.send(res.data)
  })
  .catch(error => {
    console.error(error);
  });
});

app.listen(port, () => console.log(`Hello world app listening on port ${port}!`));


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

server {
        listen 80 default_server;
        listen [::]:80 default_server;


        root /var/www/html;
        index index.html index.htm index.nginx-debian.html;

        server_name _;

        location / {
                        proxy_pass http://localhost:3000;
                        proxy_set_header Host $host;
                        proxy_set_header X-Real-IP $remote_addr;
                        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                        proxy_set_header X-Forwarded-Proto $scheme;
                }
}

service nginx restart
////////////
pm2 start index.js
pm2 startup systemd
pm2 save
systemctl start pm2-root