docker系列：docker-compose 入门demo

​目录​

​​开发程序​​

​​创建文件夹​​

​​创建文件app.py​​

​​创建文件requirements.txt​​

​​创建Dockfile​​

​​ 最终文件列表​​

​​创建Compose services ​​

​​运行compose ​​

​​效果​​

---

开发程序

创建文件夹

$ mkdir composetest
$ cd composetest

创建文件app.py

import time

import redis
from flask import Flask

app = Flask(__name__)
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.\n'.format(count)

创建文件requirements.txt

flask
redis

创建Dockfile

FROM python:3.7-alpine
WORKDIR /code
ENV FLASK_APP app.py
ENV FLASK_RUN_HOST 0.0.0.0
RUN apk add --no-cache gcc musl-dev linux-headers
COPY requirements.txt requirements.txt
RUN pip install -r requirements.txt
COPY . .
CMD ["flask", "run"]

 最终文件列表

创建Compose services 

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

运行compose 

docker-compose up

 

效果：

浏览器输入:http://ip:5000/

 后续再次启动，redis会继续累加