Image Overview: docker-selenium

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Minimal docker-selenium container image with Chromium.

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The image is available on cgr.dev:

docker pull cgr.dev/chainguard/docker-selenium:latest

Usage

Run the container with the following command:

docker run --shm-size="2g" -p 4444:4444 -p 7900:7900 cgr.dev/chainguard/docker-selenium:latest

Verify Selenium is running:

curl -sL http://localhost:4444/status` should return a `200` status code, and the response body should contain `{"value":{"ready":true}}` with 1 `availability: UP` node.

Access Selenium:

http://localhost:4444

Access noVNC:

http://localhost:7900/vnc.html`:

• Login with the password secret.

Any WebDriver tests should point to Selenium on on port 4444.

The following is an example ChromeDriver test using Selenium to retrieve Chainguard’s homepage:

from selenium import webdriver
from time import sleep

print("Testing ChromeDriver...")

options = webdriver.ChromeOptions()

driver = webdriver.Remote(
  command_executor='http://localhost:4444/wd/hub',
  options=options
)

'''Maximize window'''
driver.maximize_window()
sleep(5)

'''Retrieve Chainguards homepage'''
driver.get("https://www.chainguard.dev/")
sleep(5)

'''Exit'''
driver.close()
driver.quit()
print("ChromeDriver test successful!")

Please note that Chromium is ran in a headless state with the sandbox with GPU access disabled with the flags:

--headless --no-sandbox --disable-gpu

Chromium is ran headless with GPU access disabled as the container does not have GPU access.

Chromium’s sandbox has been disabled as the container is sandboxed from the host environment, and because the container is running as the root user.

This can be overriden via the environment variable CHROMIUM_USER_FLAGS though this is unsupported.