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# Running a Registry

A minimal registry can be implemented by having a git repository that contains an index, and a server that contains the compressed `.crate` files created by `cargo package`. Users won’t be able to use Cargo to publish to it, but this may be sufficient for closed environments. The index format is described in Registry Index.

A full-featured registry that supports publishing will additionally need to have a web API service that conforms to the API used by Cargo. The web API is described in Registry Web API.

Commercial and community projects are available for building and running a registry. See https://github.com/rust-lang/cargo/wiki/Third-party-registries for a list of what is available.