MaaS

https://docs.ubuntu.com/static/maas-1.9/orientation_architecture-diagram.png

https://github.com/opencord/maas/blob/master/API.md

Debugging ephemeral image
Troubleshooting | MAAS | MAAS documentation
https://docs.ubuntu.com/maas/2.1/en/troubleshoot-faq#debugging-ephemeral-image

MaaS images at
/var/lib/maas/boot-resources/*/*/*/*/*/*/root-image