simhaonline/cloud-container

A builder for a simple initramfs image to run container over virtiofs inside cloud-hypervisor

Introduction

cloud-container is only a builder for a custom initramfs image that allows running containers on cloud-hypervisor. The container root is served over virtiofs.

The image does the following for this to work:

• Add all required virtio modules to support virtiofs, pci, and disks
• Expose environment variables from /etc/environment to the container entrypoint. A container manager then can simply write down the /etc/environment file in the container root before booting.
• Pre mount attached disks to configured endpoints
• Configure network interface via cmdline argument passed to the kernel setupnetwork

kernel arguments

• net_ethX=SPEC argument to configure each interface TO BE DEFINED
• mnt_vdX=/path auto mount disk to given end point TODO

Building

pre-requirements: docker

This will build the required initram-fs Run

./build.sh

To build the kernel, use the config file from the repo to build the kernel. This is only tested with linux 5.12.9. This will be automated later in this repo as well. buf for now you have to do do it manually.

Testing container

pre-requirement: virtiofsd, cloud-hypervisor extract a container root (or mount a container flist)

to edit the environment variables available to your entrypoint you have to edit <rootfs>/etc/environment

Run

./test.sh <rootfs> [entrypoint]

default entrypoint in /bin/bash