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Ah OK, now I get it. It's what you would want from a VM (isolation & reuse) without all the data duplication of the VM image files, and the memory requirements associated with provisioning and running many VMs.

The copy-on-write aspect is very neat.

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That's right. It's closer to the software layer than the infrastructure layer, so there's a lot more flexibility. You could essentially run a few machines on bare metal and use Docker as the virtualization layer. Just need an OS that supports LXC and you're good to go.

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