I want to build a custom VM image that boots an Alpine Linux VM in diskless mode. This basically means I need to create a rootfs.img that just contains an EFI partition with the required files (kernel, initramfs - possibly combined into a UKI image - and a directory with .apk packages).
Can I use distrobuilder for that kind of Alpine Linux setup? And are there any existing configurations to use as the starting point?
This is an interesting question. You are looking into PXE / iPXE booting, and by default the VMs will try to perform network booting if you do not provide them with a boot device. Then, you need to setup a PXE server to server the boot image. I do not know the specifics. See this relevant post, Trying to PXE Boot Netboot.xyz from an Incus VM
No, not really. Just standard UEFI boot from an EFI partition (with the UKI image as the EFI executable). But with Alpine “diskless mode”, that image then runs entirely in RAM (from the initramfs that is part of the UKI).
And what I’m looking for is not the boot setup, but rather if I can use distrobuilder to produce a VM rootfs image that either only has an EFI partition, or at least contains an EFI partition with a UKI image (that image is generated automatically by Alpine when you configure Alpine for direct UEFI boot and install the kernel package). I can live with an additional root partition in the image (which just won’t get used in that setup).
To finally answer my own question: Yes, it is possible, even if it is a bit hacky. Here is a proof of concept distrobuilder config that generates a diskless UKI-only version of https://github.com/lxc/lxc-ci/blob/main/images/alpine.yaml:
image:
distribution: "alpinelinux"
release: 3.22
variant: uki-diskless
targets:
incus:
vm:
packages:
manager: apk
update: true
cleanup: true
sets:
- packages:
- acpi
- linux-virt
- zstd
action: install
types:
- vm
# same as in https://github.com/lxc/lxc-ci/blob/main/images/alpine.yaml
- packages:
- alpine-base
- logrotate
- doas
action: install
actions:
- trigger: post-files
types:
# - vm
variants:
# - uki-diskless
action: |-
#!/bin/sh
set -eux
# generate runlevel symlinks - for some reason, those are missing
for SVC in devfs dmesg hwdrivers mdev udev udev-settle udev-trigger ; do
ln -s /etc/init.d/$SVC /etc/runlevels/sysinit/
done
for SVC in acpid bootmisc hostname hwclock loadkmap modules networking swap sysctl syslog urandom ; do
ln -s /etc/init.d/$SVC /etc/runlevels/boot/
done
# pack up the whole root filesystem as an initrd, with the exception of
# - /boot/**
# --> not needed for UEFI boot directly from an UKI image
# - /sbin/apk
# - /etc/apk/**
# --> not needed because upgrades are done by installing a new UKI and rebooting
find / -xdev -path /boot -prune -o -path /sbin/apk -prune -o -path /etc/apk -prune -o -print \
| cpio --verbose --create --format=newc \
| zstd > /boot/root.initramfs
# install ukify and and EFI stub and build an UKI image.
# Explicit install is done here to avoid getting ukify and its unique dependencies
# into /boot/root.initramfs
# The UKI image is installed to /boot/efi/EFI/BOOT/BOOTX64.EFI which causes it to end
# up as the standard UEFI bootloader in the generated incus image
apk add ukify systemd-efistub
mkdir -p /boot/efi/EFI/BOOT
FLAVOR=virt
VERSION=$(cd /lib/modules && ls -d *-$FLAVOR)
ukify build \
--linux=/boot/vmlinuz-virt \
--uname=$VERSION \
--initrd=/boot/root.initramfs \
--cmdline='rdinit=/sbin/init console=tty1 console=ttyS0' \
--output=/boot/efi/EFI/BOOT/BOOTX64.EFI
files:
# same as in https://github.com/lxc/lxc-ci/blob/main/images/alpine.yaml
- path: /etc/hostname
generator: hostname
# same as in https://github.com/lxc/lxc-ci/blob/main/images/alpine.yaml
- path: /etc/hosts
generator: hosts
# same as in https://github.com/lxc/lxc-ci/blob/main/images/alpine.yaml
- generator: incus-agent
types:
- vm
# same as in https://github.com/lxc/lxc-ci/blob/main/images/alpine.yaml
- path: /etc/network/interfaces
generator: dump
content: |-
auto eth0
iface eth0 inet dhcp
hostname $(hostname)
- path: /etc/inittab
generator: dump
name: inittab
content: |-
# /etc/inittab
::sysinit:/sbin/openrc sysinit
::sysinit:/sbin/openrc boot
::wait:/sbin/openrc default
# Set up a couple of getty's
::respawn:/sbin/getty 38400 console
# Stuff to do for the 3-finger salute
::ctrlaltdel:/sbin/reboot
# Stuff to do before rebooting
::shutdown:/sbin/openrc shutdown
# same as in https://github.com/lxc/lxc-ci/blob/main/images/alpine.yaml
source:
downloader: alpinelinux-http
same_as: 3.12
url: https://mirror.csclub.uwaterloo.ca/alpine/
keys:
# 0482D84022F52DF1C4E7CD43293ACD0907D9495A
- |-
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-----END PGP PUBLIC KEY BLOCK-----
# same as in https://github.com/lxc/lxc-ci/blob/main/images/alpine.yaml
mappings:
architecture_map: alpinelinux
Running sudo distrobuilder build-incus --vm alpine-uki.yaml --type=unified on that config will generate a working incus image that boots from UKI and runs entirely in RAM.
Note that the VM image generated by distrobuilder still contains a partition with a traditional root file system, even if it is not used (or needed) by the VM. To get a real minimal image, delete partition two from the generated rootfs.img and only keep partition 1 (the EFI partitition).