Questions[juju](ubuntu)

I have a small lab (literally) of 3 RBP-3B units with SATA and SD drives attached running Ubuntu 16.04 LTS. I have installed software on them to create a Ceph cluster but its tricky and pretty fragile.

Ultimately I would like to administer this "Worlds Smallest Cloud Storage Cluster" concept with Juju and make it the storage backend for an Intel NUC vBlock I won from the OSIC contest at the Openstack summit. Unfortunately I cant find a way to PXE boot the Raspberry Pi 3B, and chip support for this feature is on the horizon but currently not present.

I want to use MaaS to bootstrap the OS and feed these little guys into Juju deployments since its so easy from there to manage everything, but I am having trouble finding a working solution. I know that Juju can add machines after the OS is installed but its not apparent how to do that either, and if I set Juju up to use existing machines I don't know if I can still point it to MaaS controlled systems as well to create a heterogenous mix of gear without breaking functionality.

Any thoughts?

I am running a virtual (kvm) MAAS/juju setup where most of the MAAS nodes (including MAAS master) are virtual, but some are also physical nodes. The physical Dell 1950 nodes configures automatically for boot in MAAS, so when i deploy via Juju they power on automatically. My problem lies in trying to set up boot for virtual systems. I see the posibility in the MAAS for power type. I can choose virsh. But i need to fill in information i do not know. What should i fill in for Driver and Power ID?

Anyone has experience with that?

What is a Juju Charm? What is it used for?

I'm too cheap to pay for EC2, and I don't have enough servers to set up my own openstack, how do I configure juju to use Linux Containers (LXC) on something like my laptop?

Have tried asking 3rd party about key differences between Juju and Puppet/Chef. 3rd parties are not too familiar with Juju and could not say. They simply stated the others have a lot of momentum, and it would be hard to overcome their lead.

Would those closest to Juju be willing to highlight the advantages of this software, and why it will overtake Puppet/Chef in the config management arena?