The Smart Way To Build a Local Docker Image with Buildx

Learn how to use docker buildx build local image to create and load images for multiple platforms easily, with practical examples. Our Docker Live Support Team is always here to help you.

The Smart Way To Build a Local Docker Image with Buildx

If you’ve been working with Docker for a while, you’ve probably hit that point where you wish one image could run across all platforms, Intel, ARM, or even PowerPC. That’s exactly what docker buildx build local image helps you do.

It’s basically Docker’s upgraded builder, designed for developers who want flexibility without jumping through hoops. You can build once and run anywhere, and it’s surprisingly straightforward.

So, What Makes Buildx Worth Using?

The usual docker build works fine, but docker buildx build local image gives you a big edge, multi-platform support. That means you can create images that run on different CPU architectures in one single build.

Here’s the simplest way to start:

docker buildx build -t myimage:latest -f Dockerfile .

Breaking that down:

• -t myimage:latest → gives your image a name and tag.
• -f Dockerfile → tells Docker which Dockerfile to use.
• . → this dot represents your current directory (the build context).

And yes, you can go further by adding –platform if you want to build for multiple architectures at once.

Wait, Where Does the Image Go?

Here’s the small twist that trips up a lot of people.
When you use this, your image doesn’t automatically appear in the local Docker image list like it usually does with docker build. Instead, it stays tucked away inside Docker’s internal build cache.

But don’t worry, there’s a fix. You just need to tell Docker what to do with the final image.

You’ve got two important flags here:

–load: loads your image into your local Docker image list.
(Only works for single-architecture images.)

–push: pushes your image straight to a Docker registry like Docker Hub.

For example, to load locally:

docker buildx build … --load …

If you try this with a multi-arch image, Docker will throw an error like:

=> ERROR exporting to oci image format 0.0s

failed to solve: rpc error: code = Unknown desc = docker

exporter does not currently support exporting manifest lists

So when you’re going multi-arch, stick with –push.

Building and Pushing to Docker Hub

First, log in to your Docker Hub account:

$ export DOCKER_USER=’arturklauser’

$ docker login -u “$DOCKER_USER”

Password: *****

Once you’re logged in, run this command to build and push your image for multiple platforms:

$ docker buildx build -t “${DOCKER_USER}/buildx-test:latest” \

--platform linux/amd64,linux/arm64,linux/ppc64le --push .

Now you’ve built for x86, ARM, and PowerPC, all at once, in one command.
This is where docker buildx really shines.

Confirming Your Multi-Arch Build

Once your build is complete, you can verify it easily:

$ docker buildx imagetools inspect “$DOCKER_USER/buildx-test:latest”

Here’s what you’ll see:

Name: docker.io/arturklauser/buildx-test:latest

MediaType: application/vnd.docker.distribution.manifest.list.v2+json

Digest: sha256:57ca2d778839da0b6287bcbc99fc2299b0cea29e5fe4cff8492a1ba6e62fc8c5

Manifests:

Name: docker.io/arturklauser/buildx-test:latest@sha256:cc57b693aba3acedeec2e624b55e543919173a3e9ed76c2af2f2cd9713b84b78

Platform: linux/amd64

Name: docker.io/arturklauser/buildx-test:latest@sha256:7997da18dbf6e4b2748736821ec6f1dd11d6e8493f068fb23913507a9a271e2c

Platform: linux/arm64

Name: docker.io/arturklauser/buildx-test:latest@sha256:6ed2267dc7082fbfc4454805b94326418ad14c530879a7c9d6f02f0961e2899c

Platform: linux/ppc64le

You can also test the image locally to make sure everything works:

$ docker run --rm “$DOCKER_USER/buildx-test:latest”

Unable to find image ‘arturklauser/buildx-test:latest’ locally

latest: Pulling from arturklauser/buildx-test

Digest: sha256:57ca2d778839da0b6287bcbc99fc2299b0cea29e5fe4cff8492a1ba6e62fc8c5

Status: Downloaded newer image for arturklauser/buildx-test:latest

Running on x86_64

And to double-check its architecture:

$ docker inspect --format “{{.Architecture}}” “$DOCKER_USER/buildx-test:latest”

amd64

Looks good!

Conclusion

Honestly, once you get used to docker buildx build local image, there’s no going back. It saves time, supports multiple platforms, and keeps your workflow clean. You don’t need fancy scripts or separate builds anymore, just one command that works across everything.

So next time you’re setting up a Docker image, skip the old docker build route and use this. It’s simple, flexible, and just makes sense.