# `IMDS.Providers.OpenStack`

OpenStack Compute (nova) metadata service.

The service answers on the link-local address `169.254.169.254`. From the
Victoria release, nova also answers on the IPv6 address `fe80::a9fe:a9fe`.
That address has no route without an interface name, and a URL cannot carry
an interface for a link-local address, so the IPv6 address is out of scope.
The provider reads the OpenStack metadata document
`/openstack/latest/meta_data.json` and the machine type from the
EC2-compatible path `/latest/meta-data/instance-type`.

The document holds the instance UUID, the instance name, the hostname, the
availability zone and the project ID. Nova reports no region, so `region` is
`nil`. The machine type comes from the EC2-compatible path and is `nil` when
that path is absent, because OpenStack documents the EC2-compatible paths as
a compatibility layer that a later release can remove.

Detection needs the instance UUID and one more nova field, the launch index
or the hostname.

# `path`

```elixir
@spec path() :: binary()
```

Return the metadata path of the OpenStack metadata document.

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