# Deploying the Nginx Ingress controller

This example aims to demonstrate the deployment of an nginx ingress controller and
use a ConfigMap to configure a custom list of headers to be passed to the upstream
server

## Default Backend

The default backend is a Service capable of handling all url paths and hosts the
nginx controller doesn't understand. This most basic implementation just returns
a 404 page:

```console
$ kubectl apply -f default-backend.yaml
deployment "default-http-backend" created
service "default-http-backend" created

$ kubectl -n kube-system get po
NAME                                    READY     STATUS    RESTARTS   AGE
default-http-backend-2657704409-qgwdd   1/1       Running   0          28s
```

## Controller

You can deploy the controller as follows:

```console
$ kubectl apply -f nginx-ingress-controller.yaml
deployment "nginx-ingress-controller" created

$ kubectl -n kube-system get po
NAME                                       READY     STATUS    RESTARTS   AGE
default-http-backend-2657704409-qgwdd      1/1       Running   0          2m
nginx-ingress-controller-873061567-4n3k2   1/1       Running   0          42s
```

Note the default settings of this controller:
* serves a `/healthz` url on port 10254, as both a liveness and readiness probe
* takes a `--default-backend-service` argument pointing to the Service created above