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Added documentation for the env_var tag in configuration files #2982

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Jul 24, 2017
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Added documentation for the env_var tag in configuration files #2982

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17 changes: 17 additions & 0 deletions source/_docs/configuration/yaml.markdown
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Expand Up @@ -61,3 +61,20 @@ sensor:
state_topic: sensor2/topic
```

### {% linkable_title Using Environment Variables %}

You can include values from your system's environment variables with `!env_var`.

```yaml
http:
api_password: !env_var PASSWORD
```

#### Default Value

If an environment variable is not set, you can fallback to a default value.

```yaml
http:
api_password: !env_var PASSWORD default_password
```