How To Run Selenium With Chrome In Docker

Question

I installed google-chrome in a Docker, but when I run my Python 2 script of Selenium, it failed like this:

automation@1c17781fef0c:/topology-editor/test$ python          


        

Answer 1

The best way to use selenium in a docker container you need to do followings.

Your need to add next lines to your Dockerfile

# install google chrome
RUN wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add -
RUN sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google-chrome.list'
RUN apt-get -y update
RUN apt-get install -y google-chrome-stable

# install chromedriver
RUN apt-get install -yqq unzip
RUN wget -O /tmp/chromedriver.zip http://chromedriver.storage.googleapis.com/`curl -sS chromedriver.storage.googleapis.com/LATEST_RELEASE`/chromedriver_linux64.zip
RUN unzip /tmp/chromedriver.zip chromedriver -d /usr/local/bin/

# set display port to avoid crash
ENV DISPLAY=:99

# install selenium
RUN pip install selenium==3.8.0

Then your code should be like this. Especially you need to declare your driver like below:

from selenium import webdriver
chrome_options = webdriver.ChromeOptions()
chrome_options.add_argument('--no-sandbox')
chrome_options.add_argument('--window-size=1420,1080')
chrome_options.add_argument('--headless')
chrome_options.add_argument('--disable-gpu')
driver = webdriver.Chrome(chrome_options=chrome_options)

driver.get('www.google.com')
screenshot = driver.save_screenshot('test.png')
driver.quit()

Answer 2

I assume you need to run it in headless mode

https://developers.google.com/web/updates/2017/04/headless-chrome

this is how I do it in ruby

capabilities = Selenium::WebDriver::Remote::Capabilities.chrome(
chromeOptions: {args: %w[ no-sandbox headless disable-gpu window-size=1280,1000 ]})

Capybara::Selenium::Driver.new(app, :browser => :chrome, http_client: client, desired_capabilities: capabilities)

You can pretty much adapt your code in python

also consider installing some font libriaries that chrome needs to run on headless

RUN apt-get update && \
    apt-get -qq -y install  libxpm4 libxrender1 libgtk2.0-0 libnss3\ 
       libgconf-2-4  libpango1.0-0 libxss1 libxtst6 fonts-liberation\ 
       libappindicator1 xdg-utils

RUN apt-get -y install \
               xvfb gtk2-engines-pixbuf \
               xfonts-cyrillic xfonts-100dpi xfonts-75dpi xfonts-base xfonts-scalable \
               imagemagick x11-apps zip

Answer 3

You need to launch a standalone chrome browser

docker run -d -p 4444:4444 selenium/standalone-chrome

and then in your python script launch browser using Remote webdriver

from selenium import webdriver
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
driver = webdriver.Remote("http://127.0.0.1:4444/wd/hub", DesiredCapabilities.CHROME)

If you want you can also launch a Selenium Grid hub.

To do this as a django test do the following:

# docker-compse.yml

selenium:
  image: selenium/standalone-firefox
  ports:
  - 4444:4444

# project/app/test.py

from django.test import TestCase
from selenium import webdriver
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities


class SiteTest(TestCase):
    fixtures = [
        'app/fixtures/app.json',
        ...
    ]

    def setUp(self):
        self.browser = webdriver.Remote("http://selenium:4444/wd/hub", DesiredCapabilities.FIREFOX)

    def tearDown(self):
        self.browser.quit()

    def test_visit_site(self):
        self.browser.get('http://app:8000/')
        self.assertIn(self.browser.title, 'Home')

Note:

If you use webdriver.ChromeOptions|FirefoxOptions|etc then DesiredCapabalities import is not necessary:

from selenium import webdriver
options = webdriver.ChromeOptions()
options.add_argument('--headless')  # example
driver = webdriver.Remote("http://127.0.0.1:4444/wd/hub", options=options)

Answer 4

For people coming through google search, here is the easiest workaround:

Dockerfile

FROM python:3.7

RUN apt-get update 
RUN apt-get install -y gconf-service libasound2 libatk1.0-0 libcairo2 libcups2 libfontconfig1 libgdk-pixbuf2.0-0 libgtk-3-0 libnspr4 libpango-1.0-0 libxss1 fonts-liberation libappindicator1 libnss3 lsb-release xdg-utils

#download and install chrome
RUN wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
RUN dpkg -i google-chrome-stable_current_amd64.deb; apt-get -fy install

#install python dependencies
COPY requirements.txt requirements.txt 
RUN pip install -r ./requirements.txt 

#some envs
ENV APP_HOME /app 
ENV PORT 5000

#set workspace
WORKDIR ${APP_HOME}

#copy local files
COPY . . 

CMD exec gunicorn --bind :${PORT} --workers 1 --threads 8 main:app 

You will need to install chromedriver_binary pip package which I have added in requirements.txt as:

Flask==1.1.1
gunicorn==20.0.4
selenium==3.141.0
chromedriver-binary==79.0.3945.36

Then your main.py should be like:

from selenium import webdriver
import chromedriver_binary


chrome_options=webdriver.ChromeOptions()
chrome_options.add_argument("--headless")
chrome_options.add_argument("--no-sandbox")
chrome_options.add_argument("window-size=1400,2100") 
chrome_options.add_argument('--disable-gpu')

driver=webdriver.Chrome(chrome_options=chrome_options)

Now, build your Dockerfile using docker build -t <imagename> . and docker run --rm -p <yourPORT>:5000 <imagename>