Get_started_with_Docker_Compose.sh

#!/bin/bash

# From https://docs.docker.com/compose/gettingstarted/

cd /tmp

# Create a directory for the project
mkdir composetest
cd composetest

# Create a file called app.py in your project directory
cat << EOF > app.py
import time

import redis
from flask import Flask


app = Flask(__name__)

# In this example, redis is the hostname of the redis container
# on the application’s network. 
# We use the default port for Redis, 6379
cache = redis.Redis(host='redis', port=6379)


def get_hit_count():
    retries = 5
    while True:
        try:
            return cache.incr('hits')
        except redis.exceptions.ConnectionError as exc:
            if retries == 0:
                raise exc
            retries -= 1
            time.sleep(0.5)


@app.route('/')
def hello():
    count = get_hit_count()
    return f'Hello World! I have been seen {count} times.\n'

if __name__ == "__main__":
    app.run(host="0.0.0.0", debug=True)
EOF

# Create requirements.txt in your project directory
cat << EOF > requirements.txt
flask
redis
EOF

# This tells Docker to:
#   Build an image starting with the Python image.
#   Add the current directory . into the path /code in the image.
#   Set the working directory to /code.
#   Install the Python dependencies.
#   Set the default command for the container to python app.py.
cat << EOF > Dockerfile
FROM python:alpine
ADD . /code
WORKDIR /code
RUN pip install -r requirements.txt
CMD ["python", "app.py"]
EOF


cat << EOF > docker-compose.yml
version: '3'
services:
  web:
    build: .
    ports:
     - "5000:5000"
    volumes:
     - .:/code
  redis:
    image: "redis:alpine"
EOF