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alanjcastonguay Explain references in custom-headers documentation
Augment description of custom-headers behavior. Explain the purpose of the two configmaps, making explicit that one cites the other by `namespace/name`. Link the two example yaml files, so they're more easily navigated to from a browser looking at https://kubernetes.github.io/ingress-nginx/examples/customization/custom-headers/

Campfire: grammar, standard installation is in the `ingress-nginx` namespace.
Latest commit 5eda92b May 14, 2019

README.md

Custom Headers

This example demonstrates configuration of the nginx ingress controller via a ConfigMap to pass a custom list of headers to the upstream server.

custom-headers.yaml defines a ConfigMap in the ingress-nginx namespace named custom-headers, holding several custom X-prefixed HTTP headers.

kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/docs/examples/customization/custom-headers/custom-headers.yaml

configmap.yaml defines a ConfigMap in the ingress-nginx namespace named nginx-configuration. This controls the global configuration of the ingress controller, and already exists in a standard installation. The key proxy-set-headers is set to cite the previously-created ingress-nginx/custom-headers ConfigMap.

kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/docs/examples/customization/custom-headers/configmap.yaml

The nginx ingress controller will read the ingress-nginx/nginx-configuration ConfigMap, find the proxy-set-headers key, read HTTP headers from the ingress-nginx/custom-headers ConfigMap, and include those HTTP headers in all requests flowing from nginx to the backends.

Test

Check the contents of the ConfigMaps are present in the nginx.conf file using: kubectl exec nginx-ingress-controller-873061567-4n3k2 -n ingress-nginx cat /etc/nginx/nginx.conf

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