Docker-Exercise4

Technologies

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In this exercise you will write your own Dockerfiles to dockerize 2 applications.

# Preparation

Copy the following files into a local directory on your system. Use the paths specified above the files.

python-app/bmi.py

print('(1) Metric (m, kg) or (2) Non-Metric (ft, pounds)?')
 
chosen_system = input('Please choose: ')
 
if (chosen_system != '1' and chosen_system != '2'):
  print('You have to choose either metric or non-metric. Shutting down...')
  exit()
 
height_unit = 'meters'
weight_unit = 'kilograms'
 
if (chosen_system == '2'):
  height_unit = 'feet'
  weight_unit = 'pounds'
 
print('Please enter your height in ' + height_unit)
user_height = float(input('Your height: '))
 
print('Please enter your weight in ' + weight_unit)
user_weight = float(input('Your weight: '))
 
adj_height = user_height
adj_weight = user_weight
 
if (chosen_system == '2'):
  adj_height = user_height / 3.28084
  adj_weight = user_weight / 2.20462
 
bmi = adj_weight / (adj_height * adj_height)
 
print('Your body-mass-index: ' + str(bmi))

node-app/server.js

const express = require('express');
 
const app = express();
 
app.get('/', (req, res) => {
  res.send(`
    <h1>Hello from inside the very basic Node app!</h1>
  `);
})
 
app.listen(3000);

node-app/package.json

{
  "name": "app",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "express": "^4.17.1"
  }
}

# Instructions

Dockerize BOTH apps - the Python and the Node app.

1. Create appropriate images for both apps (two separate images!). HINT: Have a brief look at the app code to configure your images correctly! X
2. Launch a container for each created image, making sure, that the app inside the container works correctly and is usable. X
3. Re-create both containers and assign names to both containers. Use these names to stop and restart both containers. X
4. Clean up (remove) all stopped (and running) containers, clean up all created images. X
5. Re-build the images - this time with names and tags assigned to them. X
6. Run new containers based on the re-built images, ensuring that the containers are removed automatically when stopped. X