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Build docker from scratch
The Dockerfiles included in the repository are using the buildx plugin. This plugin is includes in docker newer than Docker-ce CLI 19.03.2. The plugin is used to be able to build different container arches. Building the Dockerfiles without buildx is not possible.
Build native
To build the container on the native arch you can just use:
$ sudo docker buildx build -t headscale:custom-arch .
For example: This will build a amd64(x86_64) container if your hostsystem is amd64(x86_64). Or a arm64 container on a arm64 hostsystem (raspberry pi4).
Build cross platform
To build a arm64 container on a amd64 hostsystem you could use:
$ sudo docker buildx build --platform linux/arm64 -t headscale:custom-arm64 .
Import: Currently arm32 build are not supported as there is a problem with a library used by headscale. Hopefully this will be fixed soon.
Build multiple arches
To build multiple archres you could use:
$ sudo docker buildx create --use
$ sudo docker buildx build --platform linux/amd64,linux/arm64 .