[Docker-compose] Python Flask+Redis(練習2)

Posted on by Bocky

yml的基本語法結構:

services: # 容器
  servicename: # 服務名字，這個名字也是內部 bridge網絡可以使用的 DNS name
    image: # 鏡像的名字
    command: # 可選，如果設置，則會覆蓋默認鏡像裡的 CMD命令
    environment: # 可選，相當於 docker run裡的 --env
    volumes: # 可選，相當於docker run裡的 -v
    networks: # 可選，相當於 docker run裡的 --network
    ports: # 可選，相當於 docker run裡的 -p
  servicename2:

volumes: # 可選，相當於 docker volume create

networks: # 可選，相當於 docker network create

練習

以Python Flask+Redis(練習)：為例子，改造成一個docker-compose文件

app.py檔案內容如下:

from flask import Flask

app = Flask(__name__)


@app.route('/')
def hello_world():
    return 'hello'


if __name__ == "__main__":
    app.run(debug=True, host='0.0.0.0', port=5000)

dockerfile如下：

FROM python:3.9.5-slim

RUN pip install flask redis && \
    groupadd -r flask && useradd -r -g flask flask && \
    mkdir /src && \
    chown -R flask:flask /src

USER flask

COPY app.py /src/app.py

WORKDIR /src

ENV FLASK_APP=app.py REDIS_HOST=redis

EXPOSE 5000

CMD ["flask", "run", "-h", "0.0.0.0"]

docker-compose.yml內容如下:

version: "3.8"

services:
  flask-demo:
    image: flask-demo:latest
    environment:
      - REDIS_HOST=redis-server
    networks:
      - demo-network
    ports:
      - 8899:5000

  redis-server:
    image: redis:latest
    networks:
      - demo-network

networks:
  demo-network: null
  1. 資料結構
.
├── app.py
├── docker-compose.yml
└── dockerfile
  1. 建立2個image
  • 下載redis image
docker image pull redis
  • 建立flask-demo的image
docker image build -t flask-demo .
  1. 運行docker-compose
$ docker-compose up  
Creating network "my_flask_demo-network" with the default driver
Creating my_flask_redis-server_1 ... done
Creating my_flask_flask-demo_1   ... done
Attaching to my_flask_redis-server_1, my_flask_flask-demo_1
redis-server_1  | 1:C 31 Jan 2022 12:26:05.447 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
redis-server_1  | 1:C 31 Jan 2022 12:26:05.447 # Redis version=6.2.6, bits=64, commit=00000000, modified=0, pid=1, just started
redis-server_1  | 1:C 31 Jan 2022 12:26:05.447 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
redis-server_1  | 1:M 31 Jan 2022 12:26:05.447 * monotonic clock: POSIX clock_gettime
redis-server_1  | 1:M 31 Jan 2022 12:26:05.448 * Running mode=standalone, port=6379.
redis-server_1  | 1:M 31 Jan 2022 12:26:05.448 # Server initialized
redis-server_1  | 1:M 31 Jan 2022 12:26:05.449 * Ready to accept connections
flask-demo_1    |  * Serving Flask app 'app.py' (lazy loading)
flask-demo_1    |  * Environment: production
flask-demo_1    |    WARNING: This is a development server. Do not use it in a production deployment.
flask-demo_1    |    Use a production WSGI server instead.
flask-demo_1    |  * Debug mode: off
flask-demo_1    |  * Running on all addresses.
flask-demo_1    |    WARNING: This is a development server. Do not use it in a production deployment.
flask-demo_1    |  * Running on http://172.25.0.3:5000/ (Press CTRL+C to quit)

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127.0.0.1:8899

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