# `Rheo.Application`
[🔗](https://github.com/thanos/rheo/blob/v1.0.0/lib/rheo/application.ex#L1)

OTP application entry for Rheo.

By default Rheo does not auto-start an instance. Host applications supervise
`{Rheo, opts}` themselves.

Set `config :rheo, start_on_application: true` together with
`config :rheo, backend: Rheo.Backend.ETS` (or `{module, opts}`) to start the
default instance under this application. The legacy `:mongo_url` key is
honoured only when `:backend` is unset and `Rheo.Backend.Mongo` is available.

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*Consult [api-reference.md](api-reference.md) for complete listing*