To push both amd64 and arm64 images to Docker Hub and tag them under the same image tag, you can use Docker's buildx tool to create a multi-architecture manifest. Here's a step-by-step guide:

  1. Install and setup buildx (if you haven't already):

    docker buildx create --use
docker buildx inspect --bootstrap

  2. Log in to Docker Hub:

    docker login

  3. Load your existing images into buildx:

    If you already have the images built locally, you can load them into the buildx builder. Suppose your images are amd64_image.tar and arm64_image.tar, and you want to push them under yourusername/yourimage:tag.

    docker load --input amd64_image.tar
docker load --input arm64_image.tar

  4. Tag your images:

    Tag your images properly before pushing them.

    docker tag <amd64_image_id> yourusername/yourimage:tag-amd64
docker tag <arm64_image_id> yourusername/yourimage:tag-arm64

  5. Push the individual architecture images:

    Push each architecture-specific image to Docker Hub.

    docker push yourusername/yourimage:tag-amd64
docker push yourusername/yourimage:tag-arm64

  6. Create and push a multi-architecture manifest:

    Create a manifest list that includes both architectures and push it to Docker Hub under the same tag.

    docker buildx imagetools create \
    --tag yourusername/yourimage:tag \
    yourusername/yourimage:tag-amd64 \
    yourusername/yourimage:tag-arm64

    This command creates a manifest list that includes the images for both amd64 and arm64 architectures and tags it as yourusername/yourimage:tag.

Now, when you pull yourusername/yourimage:tag, Docker will automatically select the appropriate image for your architecture.