Add information about nginx controller flags

controllers/nginx/README.md

@@ -5,6 +5,7 @@ This is an nginx Ingress controller that uses [ConfigMap](https://github.com/kub
 ## Contents
 * [Conventions](#conventions)
 * [Requirements](#requirements)
+* [Command line arguments](#command-line-arguments)
 * [Dry running](#try-running-the-ingress-controller)
 * [Deployment](#deployment)
 * [HTTP](#http)
@@ -41,6 +42,38 @@ Anytime we reference a tls secret, we mean (x509, pem encoded, RSA 2048, etc). Y
 - Default backend [404-server](https://github.com/kubernetes/contrib/tree/master/404-server)
 
 
+## Command line arguments
+```
+Usage of :
+      --alsologtostderr                  log to standard error as well as files
+      --apiserver-host string            The address of the Kubernetes Apiserver to connect to in the format of protocol://address:port, e.g., http://localhost:8080. If not specified, the assumption is that the binary runs inside a Kubernetes cluster and local discovery is attempted.
+      --configmap string                 Name of the ConfigMap that contains the custom configuration use
+      --default-backend-service string   Service used to serve a 404 page for the default backend. Takes the form namespace/name. The controller uses the first node port of this Service for the default backend.
+      --default-ssl-certificate string   Name of the secret that contains a SSL certificate to be used as default for a HTTPS catch-all server
+      --election-id string               Election id to use for status update. (default "ingress-controller-leader")
+      --force-namespace-isolation        Force namespace isolation. This flag is required to avoid the reference of secrets or configmaps located in a different namespace than the specified in the flag --watch-namespace.
+      --health-check-path string         Defines the URL to be used as health check inside in the default server in NGINX. (default "/healthz")
+      --healthz-port int                 port for healthz endpoint. (default 10254)
+      --ingress-class string             Name of the ingress class to route through this controller.
+      --kubeconfig string                Path to kubeconfig file with authorization and master location information.
+      --log_backtrace_at traceLocation   when logging hits line file:N, emit a stack trace (default :0)
+      --log_dir string                   If non-empty, write log files in this directory
+      --logtostderr                      log to standard error instead of files
+      --profiling                        Enable profiling via web interface host:port/debug/pprof/ (default true)
+      --publish-service string           Service fronting the ingress controllers. Takes the form namespace/name. The controller will set the endpoint records on the ingress objects to reflect those on the service.
+      --stderrthreshold severity         logs at or above this threshold go to stderr (default 2)
+      --sync-period duration             Relist and confirm cloud resources this often. (default 1m0s)
+      --tcp-services-configmap string    Name of the ConfigMap that contains the definition of the TCP services to expose.
+		  The key in the map indicates the external port to be used. The value is the name of the service with the format namespace/serviceName and the port of the service could be a number of the name of the port.
+		  The ports 80 and 443 are not allowed as external ports. This ports are reserved for the backend
+      --udp-services-configmap string    Name of the ConfigMap that contains the definition of the UDP services to expose.
+		  The key in the map indicates the external port to be used. The value is the name of the service with the format namespace/serviceName and the port of the service could be a number of the name of the port.
+      --update-status                    Indicates if the ingress controller should update the Ingress status IP/hostname. Default is true (default true)
+-v, --v Level                          log level for V logs
+      --vmodule moduleSpec               comma-separated list of pattern=N settings for file-filtered logging
+      --watch-namespace string           Namespace to watch for Ingress. Default is to watch all namespaces
+```
+
 ## Try running the Ingress controller
 
 Before deploying the controller to production you might want to run it outside the cluster and observe it.