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Document the HRM default backend behaviors (#4748)

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Jeff Anderson 2017-10-02 11:54:22 -06:00 committed by Jim Galasyn
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commit 74a05028c7
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datacenter/ucp/2.2/guides/user/services/use-domain-names-to-access-services.md
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@ -185,6 +185,17 @@ com.docker.ucp.mesh.http.2=external_route=sni://example.org
Because HRM forwards traffic to your application, the requests that your application receives will all appear to come from HRM's IP address. If you add `include_forwarded_for=true` in the HRM label for your service, HRM will add an HTTP header to every request called `X-Forwarded-For` that will contain the IP address that the original request came from. Note that this feature will only work if your external_route field begins with `http://`. Because HRM forwards traffic to your application, the requests that your application receives will all appear to come from HRM's IP address. If you add `include_forwarded_for=true` in the HRM label for your service, HRM will add an HTTP header to every request called `X-Forwarded-For` that will contain the IP address that the original request came from. Note that this feature will only work if your external_route field begins with `http://`.
### Default Service
If you want a particular service to serve all requests that don't match an otherwise defined `external_route`, set an `external_route` to a blank hostname. For example:
```none
com.docker.ucp.mesh.http.1=external_route=http://
com.docker.ucp.mesh.http.2=external_route=sni://
```
If you don't define `external_route=sni://` on any service, HRM will default to use the UCP controller itself as the default SNI route. If you don't define `external_route=http://` on any service, HRM will return an http 503 error.
### Keep services isolated ### Keep services isolated
If you want to keep the services from sharing the same network, before If you want to keep the services from sharing the same network, before