I worked on this project maas-sandbox to create a cloud phausman/maas-sandbox: Quickly launch a virtual MAAS sandbox with a few PXE-booted nodes using Vagrant and libvirt. (github.com)
I have problem with the networks that are not reaching internet using the host network interface [ vagrant-libvirt network can reach the internet it uses DHCP, OAM and Floating-IP cannot reach the internet and I become able to install juju controller]. In addition, SSH is not accessible when a new VM is created using the SSH public key. I desvribed the probelm in the project issues Could not connect to snap store and get maas and give it the ip 172.16.106.118 · Issue #2 · phausman/maas-sandbox (github.com)