Add security recommendations documentation

docs-web/configuration/index.rst

@@ -9,5 +9,6 @@ Configuration
    virtualserver-and-virtualserverroute-resources
    handling-host-and-listener-collisions
    policy-resource
+   security
    transportserver-resource
    configuration-examples

docs-web/configuration/security.md

@@ -0,0 +1,39 @@
+# Security
+
+The security of the Ingress Controller is paramount to the success of our Users, however, the Ingress Controller is deployed by a User in their environment, and as such, the User takes responsibility 
+for securing a deployment of the Ingress Controller. 
+We strongly recommend every User read and understand the following security concerns.
+
+## Kubernetes
+We recommend the Kubernetes [guide to securing a cluster](https://kubernetes.io/docs/tasks/administer-cluster/securing-a-cluster/).
+In addition, the following relating more specifically to Ingress Controller.
+
+### RBAC and Service Account
+The Ingress Controller is deployed within a Kubernetes environment, this environment must be secured. 
+Kubernetes uses [RBAC](https://kubernetes.io/docs/reference/access-authn-authz/rbac/) to control the resources and operations available to different types of users.
+The Ingress Controller requires a service account which is configured using RBAC. 
+We strongly recommend using the [RBAC configuration](https://github.com/nginxinc/kubernetes-ingress/blob/master/deployments/rbac/rbac.yaml) provided in our standard deployment configuration. 
+It is configured with the least amount of privilege required for the Ingress Controller to work.
+
+We strongly recommend inspecting the RBAC configuration (for [manifests installation](https://github.com/nginxinc/kubernetes-ingress/blob/master/deployments/rbac/rbac.yaml) 
+or for [helm](https://github.com/nginxinc/kubernetes-ingress/blob/master/deployments/helm-chart/templates/rbac.yaml)) 
+to understand what access the Ingress Controller service account has and to which resources. 
+For example, by default the service account has access to all Secret resources in the cluster.
+
+### Certificates and Privacy Keys
+Secrets are required by the Ingress Controller for some configurations. 
+[Secrets](https://kubernetes.io/docs/concepts/configuration/secret/) are stored by Kubernetes unencrypted by default. 
+We strongly recommend configuring Kubernetes to store these Secrets encrypted at rest. 
+Kubernetes has [documentation](https://kubernetes.io/docs/tasks/administer-cluster/encrypt-data/) on how to configure this.
+
+## Ingress Controller
+
+### Recommended Secure Defaults
+We recommend the following for the most secure configuration:
+ * If Prometheus metrics are [enabled](/nginx-ingress-controller/configuration/global-configuration/command-line-arguments/#cmdoption-enable-prometheus-metrics), 
+   we recommend [configuring HTTPS](/nginx-ingress-controller/configuration/global-configuration/command-line-arguments/#cmdoption-prometheus-tls-secret) for Prometheus.
+
+### Snippets
+[Snippets](/nginx-ingress-controller/configuration/ingress-resources/advanced-configuration-with-snippets/)
+Snippets will be disabled by default in the future. 
+Be sure to understand the implications of configurations you provide through the Snippets capability.