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Clean up annotations.md; extract default backend from miscellaneous

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Aarni Koskela 2018-05-03 12:46:39 +03:00
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10
docs/user-guide/miscellaneous.md
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# Miscellaneous
## Requirements
The default backend is a service which handles all url paths and hosts the nginx controller doesn't understand (i.e., all the requests that are not mapped with an Ingress).
Basically a default backend exposes two URLs:
- `/healthz` that returns 200
- `/` that returns 404
The sub-directory [`/images/404-server`](https://github.com/kubernetes/ingress-nginx/tree/master/images/404-server) provides a service which satisfies the requirements for a default backend. The sub-directory [`/images/custom-error-pages`](https://github.com/kubernetes/ingress-nginx/tree/master/images/custom-error-pages) provides an additional service for the purpose of customizing the error pages served via the default backend.
## Source IP address
By default NGINX uses the content of the header `X-Forwarded-For` as the source of truth to get information about the client IP address. This works without issues in L7 **if we configure the setting `proxy-real-ip-cidr`** with the correct information of the IP/network address of trusted external load balancer.