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Intro to go here explaining LXD versus LXC and why you want to use it. For now, key bullets,

• LXD sits on top of LXC
• REST API to orchestrates containers locally and remotely
• Allows moving and copying between hosts
• Takes advantage of advanced file systems (in particular ZFS)
• Improves on security specifically running as unprivileged hence root inside container does not get root on host

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Setup 

A key feature of virtualization technology is taking snapshots. With traditional file systems, this is expensive in terms of storage and speed. Next generation ZFS solves many of theses problems and it is recommended by Ubuntu to install and use with LXD,

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