feat(freebsd): Initial support for freebsd guests#538
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Add initial support for FreeBSD guests. In the current status, urunc can boot FreeBSD based workloads which use a block based rootfs. This can be done either through a block image inside the container's image or through devmapper and the use of ext2 as the filesystem for the block-based snapshot. Since FreeBSD does not accept arbitrary kernel boot parameters, nor accepts network configuration through kernel boot parameters, the current implementation attaches an extra text file through virtio block. This text file contains the urunit configuration which has been updates to also include the network configuration and the application, along with its arguments. Furthermore, the current approach is limited to Firecracker, since the Qemu microVM support does not seem to work properly for FreeBSD. Signed-off-by: Charalampos Mainas <cmainas@nubificus.co.uk>
Add information in docs for FreeBSD as a supported guest, providing a few information about it and the support over urunc. Signed-off-by: Charalampos Mainas <cmainas@nubificus.co.uk>
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Description
Add initial support for FreeBSD guests. In the current status, urunc can boot FreeBSD based workloads which use a block based rootfs. This can be done either through a block image inside the container's image or through devmapper and the use of ext2 as the filesystem for the block-based snapshot.
Since FreeBSD does not accept arbitrary kernel boot parameters, nor accepts network configuration through kernel boot parameters, the current implementation attaches an extra text file through virtio block. This text file contains the urunit configuration which has been updates to also include the network configuration and the application, along with its arguments.
Furthermore, the current approach is limited to Firecracker, since the Qemu microVM support does not seem to work properly for FreeBSD.
Related issues
Add support for FreeBSD
How was this tested?
Creating a new image with a FreeBSD kernel and running it. There are two images, one with a block image for the rootfs and one with raw files in the container images which requires devmapper with ext2 filesystem for the snapshot.
LLM usage
N/A
Checklist
make lint).make test_ctr,make test_nerdctl,make test_docker,make test_crictl).