2022-08-06 追記

Seleniumのバージョンが上がって一部非推奨化したりしたので、そちらに対応した版を作成しました。

2020-09-28

docker-compose.yml

version: '3.8'
services:
  app:
    build: ./app/
    entrypoint: [ "wait-for-it", "selenium:4444", "--", "python3", "/code/main.py" ]
    volumes:
      - ./work:/work
    environment:
      SELENIUM_URL: http://selenium:4444/wd/hub
    depends_on:
      - selenium
  selenium:
    image: selenium/standalone-chrome
    volumes:
      - /dev/shm:/dev/shm

app/Dockerfile

FROM python:3

WORKDIR /work

RUN apt update && apt install -y \
  wait-for-it

ADD requirements.txt /tmp/
RUN pip3 install -r /tmp/requirements.txt

ADD code/ /code

app/requirements.txt

requests >= 2.24.0
selenium

app/code/main.py

from selenium import webdriver
from selenium.common.exceptions import NoSuchElementException
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities

selenium_url = os.environ['SELENIUM_URL']
website_url: str = None

driver = webdriver.Remote(
    command_executor=selenium_url,
    desired_capabilities=DesiredCapabilities.CHROME,
)

driver.get(website_url)