TL;DR The Docker BuildKit buildx CLI plugin simplifies building Docker images for different OS/CPU platforms (e.g. linux/amd64, linux/arm64, linux/arm, windows/amd64) So why is it a big deal now? Who needs Docker images for Arm platform anyway. Raspberry Pi geeks? A good reason for this is just a one word Graviton2…
Teaser Suppose you want to debug a Node.js application already running on a remote machine inside Docker container. And would like to do it without modifying command arguments (enabling debug mode) and opening remote Node.js debugger agent port to the whole world. I bet you didn’t know that it’s possible and also have no idea how to do it. I encourage you to continue reading this post if you are eager to learn some new cool stuff.
TL;DR Starting from Docker 17.05+, you can create a single Dockerfile that can build multiple helper images with compilers, tools, and tests and use files from above images to produce the final Docker image. The “core principle” of Dockerfile Docker can build images by reading the instructions from a Dockerfile. A Dockerfile is a text file that contains a list of all the commands needed to build a new Docker image.