I'm currently working on an ARM64 Mac and need to deploy my images to an AMD64 EC2 instance. My current process involves transferring the source code to the server and building the images there to ensure compatibility with the target architecture. I'm looking for a more efficient solution. Is it better to use multi-arch builds via Buildx, or should I let CI/CD tools like GitHub Actions or GitLab CI handle the builds on the appropriate runners?
5 Answers
Cross builds on a Mac work fine, but your compiler should just focus on the target architecture; it shouldn't really matter where the build is happening.
If you’re using Buildx, it's much more efficient to run your builds in a CI on a runner that matches your target architecture. You can even pull builds into the same manifest for easier management.
I suggest using Buildx. It's a solid choice, especially if you push to a registry afterward. You'll save a lot of time compared to dealing with tar files. Also, don't forget to use caching with Buildx for even faster builds.
Buildx, combined with tools like Colima, lets you run x86 Docker containers on ARM machines using QEMU. It's pretty efficient!
Using an automated CI/CD pipeline is definitely the way to go! It's more efficient in the long run. While I’ve had success with cross-building directly on my Mac, it can be a bit slow. So, I’d recommend setting up a CI/CD process to handle those builds instead.

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