Rocket tries to build things differently from Docker in several aspects:

Composition: Tools for downloading, installing, and running containers should be independent and composable.

Security: Isolation should be pluggable, with image auditing and application identity.

Image distribution: Image discovery should be federated and distributed, with pluggable alternative protocols such as BitTorrent or easier private distribution without a registry.

Open: The format and runtime should be well-specified and developed by a community, allowing independent implementations of tools to be consistent.

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