Building Multi-Arch Docker Images Manually: Tips & Tricks

Discover how to manually create multi-architecture Docker images using Golang without Docker Buildx. Learn the method step by step for a seamless experience!
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This video is based on the question https://stackoverflow.com/q/71372947/ asked by the user 'Erikas' ( https://stackoverflow.com/u/3195688/ ) and on the answer https://stackoverflow.com/a/71374582/ provided by the user 'BMitch' ( https://stackoverflow.com/u/596285/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Building Multi-Arch Docker Images Manually: Tips & Tricks

Are you working on a Golang project and need to build a multi-arch Docker image but want to avoid using Docker Buildx? This might seem daunting, but I’m here to guide you through the process of leveraging Go's cross-compilation capabilities to achieve your goal. Let's dive into the challenge and explore a hands-on solution!

Understanding the Problem

The question revolves around how to manually build a multi-architecture Docker image for a Golang application without utilizing Docker Buildx. Traditional methods often involve using Linux-based systems or emulated environments, which can slow down the building process significantly. However, Golang's built-in cross-compilation features allow for quicker and more efficient multi-arch builds.

The Solution: A Step-by-Step Guide

To create a multi-architectural Docker image without Buildx, follow the instructions below. This process involves setting up your Dockerfile to compile the application for different architectures and then packaging it into a Docker image.

Step 1: Setting Up the Dockerfile

Create a Dockerfile that builds your Golang application for multiple architectures. Here’s a detailed breakdown of how to do this:

Create Build Stages: The first stage of the Dockerfile will be our build environment.

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Repeat for All Required Architectures

Repeat the compile command for other target architectures such as ARM, FreeBSD, and Windows. Here’s an example of how to do this concisely:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Create the Final Multi-Arch Image

Once all binaries are built, you will create the final multi-arch image using a common base image like scratch:

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Pushing the Image to a Registry

With the image built, you can push it to a Docker registry. This can be done with Docker commands, or for more complex scenarios, consider using Docker's manifest feature to manage multi-platform images.

For example, using Docker Manifest:

[[See Video to Reveal this Text or Code Snippet]]

Summary

While Docker Buildx greatly simplifies the process of building multi-architecture images, you can still achieve your goals manually by leveraging Golang’s excellent cross-compilation capabilities. By carefully constructing your Dockerfile and using the correct build commands, you can efficiently create and push multi-arch Docker images for your applications.

Feel empowered to take on your multi-arch Docker images! Happy coding!

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