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Compose示例

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

简单示例

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.
├── Dockerfile
├── app.py
├── docker-compose.yaml
└── requirements.txt

Dockerfile:

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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
EXPOSE 5000
COPY . .
CMD ["flask", "run"]

app.py: 

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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)

requirements.txt:

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flask
redis

docker-compose.yaml:

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version: "3.9"
services:
  web:
    build: .
    ports:
      - "5000:5000"
  redis:
    image: "redis:alpine"

使用 --env-file 参数

https://docs.docker.com/compose/environment-variables/

docker-compose.yaml:

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version: "3.9"
services:
  redis:
    image: "${IMAGE_NAME}"
    ports:
      - ${PORT}:${PORT}
    environment:
      - MY_NAME=${MY_NAME}

my.env:

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IMAGE_NAME=redis:alpine
MY_NAME=nocilanro_thx
PORT=6379

启动: docker-compose --env-file my.env up -d

查看logs: 

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docker-compose --env-file my.env logs
Attaching to test_redis_1
redis_1  | 1:C 13 Jan 2021 03:32:39.394 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
redis_1  | 1:C 13 Jan 2021 03:32:39.394 # Redis version=6.0.9, bits=64, commit=00000000, modified=0, pid=1, just started
redis_1  | 1:C 13 Jan 2021 03:32:39.394 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
redis_1  | 1:M 13 Jan 2021 03:32:39.396 * Running mode=standalone, port=6379.
redis_1  | 1:M 13 Jan 2021 03:32:39.397 # Server initialized
redis_1  | 1:M 13 Jan 2021 03:32:39.397 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
redis_1  | 1:M 13 Jan 2021 03:32:39.398 * Ready to accept connections

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➜  ~ docker ps -a
CONTAINER ID        IMAGE                                               COMMAND                  CREATED             STATUS              PORTS                                            NAMES
b372ad687e9b        redis:alpine                                        "docker-entrypoint.s…"   2 minutes ago       Up 2 minutes        0.0.0.0:6379->6379/tcp                           test_redis_1
➜  ~ docker exec -ti b372ad687e9b /bin/sh
/data # echo $MY_NAME
nocilanro_thx

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from redis import StrictRedis

redis = StrictRedis(host="0.0.0.0", port=6379, db=0)
redis.set('test', "hhh")
print(redis.get('test'))

执行脚本输出hhh

关闭: docker-compose --env-file my.env down