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• with-node (Dockerfile)
• with-puppeteer (Dockerfile)
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alpine-chrome

Chrome running in headless mode in a tiny Alpine image

Why this image

We often need a headless chrome. We created this image to get a fully headless chrome image. Be careful to the "--no-sandbox" flag from Chrome

3 ways to use Chrome Headless with this image

Not secured

Launch the container using:

docker container run -it --rm zenika/alpine-chrome and use the --no-sandbox flag for all your commands.

Be careful to know the website you're calling.

Explanation for the no-sandbox flag in a quick introduction here and for More in depth design document here

With SYS_ADMIN capability

Launch the container using: docker container run -it --rm --cap-add=SYS_ADMIN zenika/alpine-chrome

This allows to run Chrome with sandboxing but needs unnecessary privileges from a Docker point of view.

The best: With seccomp

Thanks to ever-awesome Jessie Frazelle seccomp profile for Chrome.

chrome.json

Also available here wget https://raw.githubusercontent.com/jfrazelle/dotfiles/master/etc/docker/seccomp/chrome.json

Launch the container using: docker container run -it --rm --security-opt seccomp=$(pwd)/chrome.json zenika/alpine-chrome

How to use in command line

Default entrypoint

The default entrypoint does the following command: chromium-browser --headless --disable-gpu

You can get full control by overriding the entrypoint using: docker run -it --rm --entrypoint "" zenika/alpine-chrome chromium-browser ...

Use the devtools

Command (with no-sandbox): docker container run -d -p 9222:9222 zenika/alpine-chrome --no-sandbox --remote-debugging-address=0.0.0.0 --remote-debugging-port=9222 https://www.chromestatus.com/

Open your browser to: http://localhost:9222 and then click on the tab you want to inspect. Replace the beginning https://chrome-devtools-frontend.appspot.com/serve_file/@.../inspector.html?ws=localhost:9222/[END] by chrome-devtools://devtools/bundled/inspector.html?ws=localhost:9222/[END]

Print the DOM

Command (with no-sandbox): docker container run -it --rm zenika/alpine-chrome --no-sandbox --dump-dom https://www.chromestatus.com/

Print a PDF

Command (with no-sandbox): docker container run -it --rm -v $(pwd):/usr/src/app zenika/alpine-chrome --no-sandbox --print-to-pdf --hide-scrollbars https://www.chromestatus.com/

Take a screenshot

Command (with no-sandbox): docker container run -it --rm -v $(pwd):/usr/src/app zenika/alpine-chrome --no-sandbox --screenshot --hide-scrollbars https://www.chromestatus.com/

Size of a standard letterhead.

Command (with no-sandbox): docker container run -it --rm -v $(pwd):/usr/src/app zenika/alpine-chrome --no-sandbox --screenshot --hide-scrollbars --window-size=1280,1696 https://www.chromestatus.com/

Nexus 5x

Command (with no-sandbox): docker container run -it --rm -v $(pwd):/usr/src/app zenika/alpine-chrome --no-sandbox --screenshot --hide-scrollbars --window-size=412,732 https://www.chromestatus.com/

Screenshot owned by current user (by default the file is owned by the container user)

Command (with no-sandbox): docker container run -u `id -u $USER` -it --rm -v $(pwd):/usr/src/app zenika/alpine-chrome --no-sandbox --screenshot --hide-scrollbars --window-size=412,732 https://www.chromestatus.com/

How to use with Puppeteer

With tool like "Puppeteer", we can add a lot things with our Chrome Headless.

With some code in NodeJS, we can improve and make some tests.

See the "with-puppeteer" folder for more details.

If you have a NodeJS/Puppeteer script in your src folder named pdf.js, you can launch it using the following command:

docker run -it --rm -v $(pwd)/src:/usr/src/app/src --cap-add=SYS_ADMIN zenika/alpine-chrome:with-puppeteer node src/pdf.js

References

• Headless Chrome website: https://developers.google.com/web/updates/2017/04/headless-chrome

• List of all options of the "Chromium" command line: https://peter.sh/experiments/chromium-command-line-switches/

• Where to file issues: https://github.com/Zenika/alpine-chrome/issues

• Maintained by: https://www.zenika.com

Versions (in latest)

Alpine version

docker run -it --rm --entrypoint "" zenika/alpine-chrome cat /etc/alpine-release
3.9.3

Chrome version

docker run -it --rm --entrypoint "" zenika/alpine-chrome chromium-browser --version
Chromium 73.0.3683.103