The setup-qemu-action will create 2 (or more) VMs, and the build-push-action willĬompile your Dockerfile for various architectures, and push them to Docker Hub (within the same manifest). Architecture Specific Dockerfile Instructionsĭepending on the content of your Dockerfile, at this point you may be done. You’ll want to limit it to just the architectures you care about. NOTE: you must add the QEMU step before the buildx step.īy default QEMU will create almost a dozen vm’s. If you need to compile binaries/Docker images for other OS’s or architectures, you can use the QEMU Github Action. GitHub Actions only provides a small set of host system types: windows, macos & ubuntu – all running on x86_64 architecture. QEMU can alsoĭo emulation for user-level processes, allowing applications compiled for one Virtual Machine (KVM) to run virtual machines at near-native speed. +++ workflow-updated.yaml 08:10:12.000000000 -1,20 +1,22 DockerĪfter enabling buildx, the next change we need to make is to enable QEMU. Now that we know what a multi-arch docker image looks like under the hood, lets get started with a simple Github Action To learn more, see this Docker blog post Basic Docker Build via Github Actions This manifest can then be referenced by a tag so that it’s easy to find.Ī multi-arch image is actually just a manifest that contains multiple entries, 1 for each platform. This includes references to each of its layers, their corresponding sizes, the hash of the image, its size andĪlso the platform it’s supposed to work on. A manifest is a JSON file containing all the information about a Docker What is a Multi-Arch Docker Image?īefore we go any further, we should discuss how Docker Images (& Multi-Arch Docker Images) actually work.Įach Docker image is represented by a manifest. While its well known that Docker’s buildx tooling supports multi-arch builds, it can be complicated getting it working correctly I recently found myself needing to generate a multi-arch Docker image for one of my projects - specifically an ARM64 compatible image.
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