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# generals
sparse-intern-71089
04/21/2023, 8:52 AMThis message was deleted.
s
stocky-restaurant-98004
04/21/2023, 3:12 PMIt's supported in v4.
b
bright-orange-69401
04/21/2023, 3:14 PMHow so ?
I thought the only
builderVersiono
orange-policeman-59119
04/21/2023, 3:14 PMBuilderBuildKit and BuildX share a common foundation, though it looks like more improvements are coming down the line for that functionality.
You may need to install binfmt emulators to make cross platform builds work: https://github.com/tonistiigi/binfmt#installing-emulators
s
stocky-restaurant-98004
04/21/2023, 3:15 PMYou can also explicitly specify the platform in the FROM directive in the Dockerfile if an image is only designed to be built for a single platform. https://docs.docker.com/engine/reference/builder/#from
o
orange-policeman-59119
04/21/2023, 3:15 PMBut we do support setting the
platforms
stocky-restaurant-98004
04/21/2023, 3:16 PM(Getting a single image to work with both arm and amd can be tricky, depending on what you're installing.)
b
bright-orange-69401
04/21/2023, 3:16 PMI get what you're saying Josh but my based image was 100% arm64 and I did specify the
platformo
orange-policeman-59119
04/21/2023, 3:16 PMYes, unfortunately Docker does not yet have a multi-architecture API that is high level. We're waiting for improvements in Buildkit/BuildX.
orange-policeman-59119
04/21/2023, 3:17 PM@bright-orange-69401 I can guarantee that the platform field works, but you may have to install the binfmt emulators. This is also required if you're using BuildX.
The difference between your laptop and GitHub Actions is that I believe Docker for Mac and Docker for Windows may install the QEMU emulators for you.
b
bright-orange-69401
04/21/2023, 3:17 PMThe error I'm getting in GitHub Actions is:
Copy code
exec /bin/sh: exec format errorbright-orange-69401
04/21/2023, 3:18 PMOh ! So if I use this action beforehand:
https://github.com/docker/setup-qemu-action
...then maybe my
pulumi upo
orange-policeman-59119
04/21/2023, 3:19 PMPerhaps, I'm only familiar with the
binfmtorange-policeman-59119
04/21/2023, 3:20 PMActually, that action looks like it uses
binfmtb
bright-orange-69401
04/21/2023, 3:20 PMYup was gonna say exactly that 🙂
bright-orange-69401
04/21/2023, 3:21 PMI'll give it a try and I'll let you know the results
If it does work with QEMU, maybe it would be a worthy addition to the docs somewhere, for those like me who struggle getting Pulumi & Docker to play nice with arm64
👍 2
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