debian-build-iso

Builds a debian live boot image in docker. The general idea here is to set up an immutable boot USB for a docker host on my local network.

I have an internal SSD in the docker host machine, which keeps state. I prefer this over a mount since my NAS isn't configured for HA and likely never will be. I don't install the OS on the state drive due to the relative lack of support for ZFS on Linux. I prefer ZFS for the easy syncing, snapshotting, and cross-platform compatibility with my FreeBSD boxes. Has provisioning support for running a script out of the state drive on boot.

Contains:

• docker
• openssh-server
• zfs
• cifs
• More, see package lists

Pre-boot setup

Image expects a zfs dataset at /state/docker. Set this up before trying to run docker.

root@debian:~# zfs list
NAME           USED  AVAIL  REFER  MOUNTPOINT
state          612K  26.9G    96K  /state
state/apps      96K  26.9G    96K  /state/apps
state/config   712K  26.9G   632K  /state/config
state/docker    96K  26.9G    96K  /state/docker

Provisoning

If /state/config/provision.sh exists and is executable, it will be run at boot.

Write to USB

• https://unix.stackexchange.com/questions/382817/uefi-bios-bootable-live-debian-stretch-amd64-with-persistence

Research/Sources

• https://janvrany.github.io/2018/01/fun-with-zfs-part-2-creating-debian-zfs-rescue-usb-image.html
• https://unix.stackexchange.com/questions/71064/systemd-automate-modprobe-command-at-boot-time
• https://stackoverflow.com/questions/26406048/debootstrap-inside-a-docker-container
• https://manpages.debian.org/stretch/live-build/live-build.7.en.html