開発でのDocker①

はじめてのDockerの続き

やること

• Hello World Webアプリ
• DEV環境がflask単体起動、PRODUCT環境がwsgi+flaskで起動

Hello World Webアプリ用意

# mkdir -p identidock/app
# cd identidock
# vi app/identidock.py

from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello Docker!\n'

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

Dockerfile

# vi Dockerfile

FROM python:3.4

RUN groupadd -r uwsgi && useradd -r -g uwsgi uwsgi
RUN pip install Flask==0.10.1 uWSGI==2.0.8
WORKDIR /app
COPY app /app
COPY cmd.sh /

EXPOSE 9090 9191
USER uwsgi

CMD ["/cmd.sh"]

# vi cmd.sh

#!/bin/bash
set -e

if [ "$ENV" = 'DEV' ]; then
  echo "Running Development Server"
  exec python "identidock.py"
else
  echo "Running Production Server"
  exec uwsgi --http 0.0.0.0:9090 --wsgi-file /app/identidock.py --callable app --stats 0.0.0.0:9191
fi

# chmod +x cmd.sh

起動

# docker run -e "ENV=DEV" -p 5000:5000 identidock

Composeを使った自動化

install

# sh -c "curl -L https://github.com/docker/compose/releases/download/1.5.2/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose"
# chmod +x /usr/local/bin/docker-compose

docker-compose.yml

# vi docker-compose.yml

identidock:
  build: .
  ports:
    - "5000:5000"
  environment:
    ENV: DEV
  volumes:
    - ./app:/app

起動

# docker-compose up