[PYTHON] Build Flask environment with Dockerfile + docker-compose.yml

As a memorandum when you want to easily build a flask environment.

Execution environment

Mac OSX　10.15.4
Docker version 19.03.8

Directory structure

test/
   |- Dockerfile
   |- docker-compose.yml
   |- app/
      |- app.py

Description of each file

Dockerfile

Described in the same way as the following article
Easy web application development with Docker + Flask
Added command to create ʻapp` directory inside container
To mount the local ʻapp` directory

FROM ubuntu:latest

RUN apt-get update
RUN apt-get install python3 python3-pip -y

RUN pip3 install flask

RUN mkdir /app

docker-compose.yml

Define the following procedure in this file.

build: Create an image based on the Dockerfile in the specified path
command: Command to be executed in the container after starting the container
volumes: Mount local ./app to / app in the container
ports: Specify port

version: '3'
services: 
    web:
        build: .
        command: python3 app/app.py
        volumes:
            - ./app:/app
        ports:
            - 5000:5000

app/app.py

This is also described in the same way as the following article
[Easy web application development with Docker + Flask](https://qiita.com/phorizon20/items/57277fab1fd7aa994502#web%E3%82%A2%E3%83%97%E3%83%AA%E3%81 % AE% E6% BA% 96% E5% 82% 99) "Preparing the web application" section

Now you are ready.

Build → Container start → Web server start

One command below!

$ docker-compose up -d

Check if the container is running
OK if State is "Up"

$ docker-compose ps
   Name           Command         State           Ports         
----------------------------------------------------------------
test_web_1   python3 app/app.py   Up      0.0.0.0:5000->5000/tcp

If you access http: // localhost: 5000 / and "Hello world !!" is displayed, the construction is successful!

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