Install Script - gen new machine-id and ssh-host keys, and maybe other machine specific items

Prior to entering an issue...

One of the challenges of using an image based install is how to cover to machine unique items...

Good example here is the systemd-machine-id... some systemd units can use machine-id in place of gethostid...

https://www.freedesktop.org/software/systemd/man/machine-id.html

It's supposed to be a unique qualifier for installation - but if this is written into the image, it's going to likely be the same for every image out there...

Can always regen it on the shell - but this could also be in the first run script...

$ cat /etc/machine-id \
  && sudo rm -rf /var/lib/dbus/machine-id \
  && sudo rm -rf /etc/machine-id \
  && sudo dbus-uuidgen --ensure \
  && sudo systemd-machine-id-setup \
  && cat /etc/machine-id 

The other is the ssh_host* keys - which is a bit more important, as we don't neccessarily want every install to have the same ssh_host oriented keys...

$ sudo /bin/rm -v /etc/ssh/ssh_host_*
$ sudo dpkg-reconfigure openssh-server
$ sudo systemctl restart ssh

This one can cause issues with subsequent sessions, if the openssh-client is doing strict checking - easy enough to fix using ssh-keygen -f "<local path to .ssh/known_hosts" -R ipaddr

Are there other considerations - for example, locally administered OUI's for Ethernet/WiFi if they don't have a eeprom burned global OUI?

Thoughts?