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docs: Clarify Supervisor envvars exposure via label

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Connects-to: #830
Change-type: patch
Signed-off-by: Heds Simons <heds@whaleway.net>
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Heds Simons 2018-12-04 16:38:26 +00:00
parent 33549aa344
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docs/API.md
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@ -12,6 +12,8 @@ Only Supervisors after version 1.1.0 have this functionality, and some of the en
The supervisor exposes an HTTP API on port 48484 (`BALENA_SUPERVISOR_PORT`).
To enable these Supervisor environment variables, the `io.balena.features.supervisor-api` label must be applied for each service that requires them. See [here](https://www.balena.io/docs/learn/develop/multicontainer/#labels) for further details.
**All endpoints require an apikey parameter, which is exposed to the application as `BALENA_SUPERVISOR_API_KEY`.**
The full address for the API, i.e. `"http://127.0.0.1:48484"`, is available as `BALENA_SUPERVISOR_ADDRESS`. **Always use these variables when communicating via the API, since address and port could change**.