docker-compose

安装

• 创建项目文件夹
  mkdir composetest
  cd composetest
• 创建一个app.py文件

import time

import redis
from flask import Flask


app = Flask(__name__) #新建一个flask可运行实体
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 'Hello World! I have been seen {} times.
'.format(count)

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

• 创建requirements.txt`
  flask
  redis

创建Dockerfile

• 创建 Dockerfile 构建 docker镜像，镜像包含python应用的所应用

FROM python:3.4-alpine
ADD . /code
WORKDIR /code
RUN pip install -r requirements.txt
CMD ["python", "app.py"]

在compose file中定义服务

• 创建一个docker-compose.yml

version: '3'
services:
  web:
    build: .
    ports:
     - "5000:5000"
  redis:
    image: "redis:alpine"

-- 上述文件中定义了两个服务 web和redis

通过compos创建和运行app

docker-compose up

打开浏览器

https://ap.connect.newegg.net/+CSCOE+/logon.html?a0=15&a1=&a2=&a3=1#form_title_text

参考网址：https://docs.docker.com/compose/gettingstarted/#step-4-build-and-run-your-app-with-compose