- Emulate virtual hardware.
- Heavy system requirements.
- Sit ontop of a single kernel.
- Use LXC / cgroups to "boot up" from a different place on the hard drive--the container.
- Quickly spin up linux-based OS in kernel space.
- Integrated with ZFS for live backups.
- Designed to host individual apps, rather than the entire stack.
- Uses ephemeral disk storage unless you use volumes.