Update prereqs (#1467)

* update prereqs

* add azure support statement

* address review feedback

* address review feedback

* address review feedback

* address review feedback

Author: markxnelson

docs-source/content/userguide/introduction/introduction.md

@@ -16,16 +16,18 @@ Detailed instructions are available [here]({{< relref "/userguide/managing-opera
 
 ### Operator prerequisites
 
-* Kubernetes 1.13.5+, 1.14.8+, and 1.15.7+  (check with `kubectl version`).
-* Flannel networking v0.9.1-amd64 (check with `docker images | grep flannel`) *or* OpenShift SDN on OpenShift 4.3 systems.
-* Docker 18.9.1 (check with `docker version`) *or* CRI-O 1.14.7 (check with `crictl version | grep RuntimeVersion`).
+* Kubernetes 1.13.5+, 1.14.8+, and 1.15.7+  (check with `kubectl version`).  Not supported on Kubernetes 1.16 or 1.17; see note below.
+  See note below for OpenShift.
+* Flannel networking v0.9.1-amd64 or later (check with `docker images | grep flannel`) *or* OpenShift SDN on OpenShift 4.3 systems.
+* Docker 18.9.1 or 19.03.1 (check with `docker version`) *or* CRI-O 1.14.7 (check with `crictl version | grep RuntimeVersion`).
 * Helm 2.14.3+, 3.0.3+ (check with `helm version --client --short`).
 * Either Oracle WebLogic Server 12.2.1.3.0 with patch 29135930, or Oracle WebLogic Server 12.2.1.4.0.
    * The existing WebLogic Docker image, `container-registry.oracle.com/middleware/weblogic:12.2.1.3 `,
    has all the necessary patches applied.
    * Check the WLS version with `docker run container-registry.oracle.com/middleware/weblogic:12.2.1.3 sh -c` `'source $ORACLE_HOME/wlserver/server/bin/setWLSEnv.sh > /dev/null 2>&1 && java weblogic.version'`.
    * Check the WLS patches with `docker run container-registry.oracle.com/middleware/weblogic:12.2.1.3 sh -c` `'$ORACLE_HOME/OPatch/opatch lspatches'`.
-* You must have the `cluster-admin` role to install the operator.
+* You must have the `cluster-admin` role to install the operator.  The operator does 
+  not need the `cluster-admin` role at runtime.
 * We do not currently support running WebLogic in non-Linux containers.
 
 ### Important note about Kubernetes 1.16.0+
@@ -48,6 +50,22 @@ In accordance with these policies, the operator and WebLogic Server are supporte
 Infrastructure using *Oracle Container Engine for Kubernetes*, or in a cluster running *Oracle Linux
 Container Services for use with Kubernetes* on OCI Compute, and on "authorized cloud environments".
 
+### Microsoft Azure Kubernetes Service
+
+[Azure Kubernetes Service (AKS)](https://docs.microsoft.com/en-us/azure/aks/) is a hosted Kubernetes environment.  The WebLogic Kubernetes
+Operator, Oracle WebLogic Sever 12c and Oracle Fusion Middleware Infrastructure 12c are fully supported and certified on Azure Kubernetes Service (as per the documents
+referenced above). 
+
+AKE support and limitations: 
+
+* Both "domain in image" and "domain on persistent volume" models are supported.  
+* For domain on persistent volume we support Azure Files volumes accessed through 
+  a persistent volume claim - see [here](https://docs.microsoft.com/en-us/azure/aks/azure-files-volume).
+* Azure Load Balancers are supported when provisioned using a Kubernetes service of `type=LoadBalancer`.
+* Oracle databases running in Oracle Cloud Infrastructure are supported for Fusion Middleware 
+  Infrastructure MDS data stores only when accessed through an OCI FastConnect.
+* Windows Server containers are not currently supported, only Linux containers.
+
 ### Oracle Linux Cloud Native Environment
 
 [Oracle Linux Cloud Native Environment](https://docs.oracle.com/en/operating-systems/olcne/) is a fully integrated suite for the development and management of cloud-native applications. Based on the Open Container Initiative (OCI) and Cloud Native Computing Foundation (CNCF) standards, Oracle Linux Cloud Native Environment delivers a simplified framework for installations, updates, upgrades, and configuration of key features for orchestrating microservices.
@@ -57,10 +75,12 @@ WebLogic Server and the WebLogic Kubernetes operator are certified and supported
 
 ### OpenShift
 
-Operator 2.0.1+ is certified for use on OpenShift Container Platform 3.11.43+, with Kubernetes 1.11.5+.  OpenShift 4 certification is currently in progress.
+Operator 2.0.1+ is certified for use on OpenShift Container Platform 3.11.43+, with Kubernetes 1.11.5+.  
+
+Operator 2.5.0+ is certified for use on OpenShift Container Platform 4.3.0+ with Kubernetes 1.16.2+.
 
-When using the operator in OpenShift, the `anyuid` security context constraint is required to ensure that WebLogic containers run with a UNIX UID that has the correct permissions on the domain filesystem.
-For more information, see [OpenShift]({{<relref "/security/openshift.md">}}) in the Security section.
+When using the operator in OpenShift, a security context constraint is required to ensure that WebLogic containers run with a UNIX UID that has the correct permissions on the domain file system.
+This could be either the `anyuid` SCC or a custom one that you define for user/group `1000`. For more information, see [OpenShift]({{<relref "/security/openshift.md">}}) in the Security section.
 
 ### Important note about development-focused Kubernetes distributions