what is the difference between creating dockerfile for x86, armv7 32 and arm 64

Question

I want to create dockerfile to install node and mongodb on top of alpine. How will the dockerfile differ for x86, armv7 32 and arm 64

Answer 1

Every Dockerfile starts with a

FROM <base_image>

declaration, so you will have to choose a base image that will be able to run on your system/architecture and build on top of it.

From here:

Docker Official Images

See Docker's documentation for a good high-level overview of the program.

Architectures other than amd64?

Some images have been ported for other architectures, and many of these are officially supported (to various degrees).

• Architectures officially supported by Docker, Inc. for running Docker: (see download.docker.com) - IBM z Systems (s390x): https://hub.docker.com/u/s390x/ - ARMv7 32-bit (arm32v7): https://hub.docker.com/u/arm32v7/ - Windows x86-64 (windows-amd64): https://hub.docker.com/u/winamd64/ - Linux x86-64 (amd64): https://hub.docker.com/u/amd64/

• Other architectures built by official images: (but not officially supported by Docker, Inc.)
  • IBM POWER8 (ppc64le): https://hub.docker.com/u/ppc64le/
  • x86/i686 (i386): https://hub.docker.com/u/i386/
  • ARMv8 64-bit (arm64v8): https://hub.docker.com/u/arm64v8/
  • ARMv6 32-bit (arm32v6): https://hub.docker.com/u/arm32v6/ (Raspberry Pi 1, Raspberry Pi Zero)
  • ARMv5 32-bit (arm32v5): https://hub.docker.com/u/arm32v5/

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• You may also find other users/sources that use Docker Hub to upload their images. While doing some tests with ffmpeg on a Raspberry Pi, I decided to trust the images provided by resin.io (update: now they are called balena.io and here is their Docker hub: hub.docker.com/u/balena)
• If you are interested in learning how an image is created, you can check its Dockerfile. For example for Node.js on arm64v8 see the Dockerfiles here