azure-vmss-application-health.yml

#cloud-config
package_upgrade: true
packages:
  - nginx
  - nodejs
  - npm
write_files:
  - owner: www-data:www-data
    path: /etc/nginx/sites-available/default
    content: |
      server {
        listen 80;
        location / {
          proxy_pass http://localhost:3000;
          proxy_http_version 1.1;
          proxy_set_header Upgrade $http_upgrade;
          proxy_set_header Connection keep-alive;
          proxy_set_header Host $host;
          proxy_cache_bypass $http_upgrade;
        }
      }
  - owner: azureuser:azureuser
    path: /home/azureuser/myapp/index.js
    content: |
      var express = require('express')
      var app = express()
      var os = require('os')
      var dayjs = require('dayjs');

      app.get('/health', function (req, res) {
        var today = dayjs().format('dddd') // Return day of week in Sunday - Saturday format
        if (today.slice(-1) == 'y') {   // If the day of the week ends in y, the instance is healthy. This is obviously a silly example; your code can do whatever
          res.status(200).send('Thank you for checking in. It has been a CRAZY year, and I am just taking it one day at a time. How you you?')
        } else {
          res.status(500).send('Something went terribly wrong')
        }
      })
      
      app.listen(3000, function () {
        console.log('Hello world app listening on port 3000!')
      })
runcmd:
  - service nginx restart
  - cd "/home/azureuser/myapp"
  - npm init
  - npm install express -y
  - npm install nodemon -y
  - npm install ejs -y
  - npm install dayjs -y
  - nodejs index.js