How to set platform for automated builds on docker hub

Docker Hub
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1

I am trying to create automated builds in docker hub from GitHub. My dockerfile is targeting a bullseye debian image for linux/arm64 use. I am using emulation on my docker desktop for windows to build these images locally.

However, trying to build them using the docker automated builds I am getting errors such as these:
[Warning] The requested image’s platform (linux/arm64) does not match the detected host platform (linux/amd64) and no specific platform was requested

[91mexec /bin/sh: exec format error

From looking around online I found that these might be related to trying to build to arm64. How do I set up docker autobuilds to properly build to my target platform of linux/arm64?

Thanks!

2

This is the key

You can use hooks to customize the commands used for building images, testing and pushing to the registry.

3

Hi there,

I’m also trying to get an automated build to work for linux/arm64v8.

I’ve tried implementing a build hook like you suggested but it fails. This is what I have so far

#!/bin/bash
docker buildx build --platform linux/arm64v8 -f $DOCKERFILE_PATH $IMAGE_NAME

Any input to what i have got wrong?

Thanks

4

Fails how?

If linux/arm64v8 is a valid alias then it could work, but I use linux/arm64/v8

This isn’t running on Docker Hub but pushes the images to Docker Hub.

5

I found the issue i was missing the --platform=$BUILDPLATFORM from my docker file and also had the hook wrong it should have been #!/bin/bash docker build --platform linux/arm64v8 -t $IMAGE_NAME .

Thanks for replying so quick!