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Clarify purpose and potential penalties of primary vhost #2009

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Mar 19, 2016
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Clarify purpose and potential penalties of primary vhost #2009

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4 changes: 3 additions & 1 deletion docs/nginx.md
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Expand Up @@ -92,7 +92,9 @@ Applications typically have the following structure for their hostname:
scheme://subdomain.domain.tld
```

The `subdomain` is inferred from the pushed application name, while the `domain` is set during initial configuration in the `$DOKKU_ROOT/VHOST` file or via `dokku domains:set-global`.
The `subdomain` is inferred from the pushed application name, while the `domain.tld` is set during initial configuration and stored in the `$DOKKU_ROOT/VHOST` file. It can then be modified with `dokku domains:set-global`. This value is used as a default TLD for all applications on a host.

If a FQDN such as `other.tld` is used as the application name, the default `$DOKKU_ROOT/VHOST` will be ignored and the resulting vhost URL for that application will be `other.tld`. The exception to this rule being that if the FQDN has the same ending as the default vhost (such as `subdomain.domain.tld`), then the entire FQDN will be treated as a subdomain. The application will therefore be deployed at `subdomain.domain.tld.domain.tld`.

You can optionally override this in a plugin by implementing the `nginx-hostname` plugin trigger. For example, you can reverse the subdomain with the following sample `nginx-hostname` plugin trigger:

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