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Author: ytianle

Docker Compose and it's application⚓︎

We have already touched Docker Compose from Guidance. Now it is time to do some advance behaviors based on Docker Compose!

Docker Compose is a way to handle more than one DocKer Container. That is setting communiation between DocKer Containers. In this section, we will iterate all the situation between Server and Host combination to finally reach the goal of DocKer Container communications.

Assume our mock server looks like this:

mockapi.js
const express = require('express')
const app = express()
const port = 3000

var path = require('path')
var bodyParser = require('body-parser')
app.use(express.static(path.join(__dirname, 'build')));

var WeatherDataController = require('./REST_API/weather');

app.get('/data/2.5/weather', WeatherDataController.getData);//
//app.get('/data/2.5/weather', (req, res) => {
//  res.json({"coord":{"lon":123.262,"lat":44.5646},"weather":[{"id":801,"main":"Clouds","description":"few clouds","icon":"02d"}],"base":"stations","main":{"temp":285.23,"feels_like":284.95,"temp_min":285.23,"temp_max":285.23,"pressure":1014,"humidity":94,"sea_level":1014,"grnd_level":997},"visibility":10000,"wind":{"speed":3.41,"deg":190,"gust":9.72},"clouds":{"all":18},"dt":1664661306,"sys":{"country":"CN","sunrise":1664660711,"sunset":1664702853},"timezone":28800,"id":2036338,"name":"Kaitong","cod":200})
//})

app.listen(port, () => {
  console.log(`Example app listening on port ${port}`)
})

1. Server and client in the same Docker container⚓︎

Concept Diagram?

picture

S_d&C_d.yml
services:
  server:
    image: "swiftlang/swift:nightly-focal" #simpli_image
    volumes:
      - "C:/CS561_WEEK8:/code"
    environment:
      - USER=ytl_5 
    command: bash -c "apt-get update && apt-get install -y nodejs && node /code/myapp/app.js"

#Host:
docker-compose run --rm --name myserver server

#Docker:
curl localhost:3000/data/2.5/Weather

2. Server in Docker container, client on host⚓︎

Concept Diagram?

picture

S_d&C_h.yml
services:
  server:
    image: "swiftlang/swift:nightly-focal" #simpli_image
    volumes:
      - "C:/CS561_WEEK8:/code"
    environment:
      - USER=ytl_5 
    command: bash -c "apt-get update && apt-get install -y nodejs && node /code/myapp/app.js"
    ports: 
      -"3000:3000"

#Host:
docker-compose run --rm --service-ports server

#Host:
curl localhost:3000/data/2.5/Weather

3. Server on host, client in Docker container⚓︎

Concept Diagram?

picture

S_h&C_d.yml
services:
  client:
    image: "swiftlang/swift:nightly-focal" #simpli_image
    volumes:
      - "C:/CS561_WEEK8:/code"
    environment:
      - USER=ytl_5 
    command: bash -c "apt-get update && apt-get install -y nodejs && node /code/myapp/app.js"

#Host:
docker-compose run --rm client

#Docker Container:
curl host.docker.internal:3000/data/2.5/weather

4. Server in Docker container, client in another Docker container⚓︎

Concept Diagram?

picture

S_d&C_another_d.yml
services:
  server:
    image: "swiftlang/swift:nightly-focal"
    volumes:
      - "C:/CS561_WEEK8:/code"
    environment:
      - USER=ytl_5 
    command: bash -c "apt-get update && apt-get install -y nodejs && node /code/myapp/app.js"

  client:
    image: "swiftlang/swift:nightly-focal"
    volumes:
      - "C:/CS561_WEEK8:/code"
      - USER=ytl_5 

#Host:
docker-compose run --rm --name myserver server
docker inspect myserver | grep IPAddress
docker-compose run --rm --name myclient client
docker inspect myclient | grep IPAddress

#Docker Container:
curl <server ip address>:3000/data/2.5/weather