Update image and structure of intro topic.

Author: MikeRayMSFT

docs/linux/TOC.md

@@ -27,7 +27,9 @@
 ### [SMB](sql-server-linux-shared-disk-cluster-configure-smb.md)
 ## [7_Deploy a Pacemaker cluster](sql-server-linux-deploy-pacemaker-cluster.md)
 ## [8_Create and configure availability groups](sql-server-linux-create-availability-group.md)
-## [10_Availability group on containers with Kubernetes](tutorial-sql-server-ag-kubernetes.md)
+## [10_High availability on containers]
+### [Deploy on Kubernetes](tutorial-sql-server-containers-kubernetes.md)
+### [Deploy on Kubernetes with availability groups](tutorial-sql-server-ag-kubernetes.md)
 
 # Concepts
 ## Install
@@ -94,7 +96,6 @@
 ##### [Fail over primary replica](sql-server-linux-kubernetes-failover-job.md)
 ##### [Rotate credentials](sql-server-linux-kubernetes-rotate-credentials.md)
 ##### [Create listener services for secondary replicas](sql-server-linux-kubernetes-secondary-replica-listeners.md)
-#### [Configure with shared disk](tutorial-sql-server-containers-kubernetes.md)
 
 ## [Security](sql-server-linux-security-overview.md)
 ### [Get started with security features](sql-server-linux-security-get-started.md)

docs/linux/media/tutorial-sql-server-containers-kubernetes/kubernetes-sql.png

@@ -109,4 +109,4 @@ The version for the operator image is identical to the version for the SQL Serve
 
 ## Next steps
 
-> [SQL Server shared storage solution](tutorial-sql-server-containers-kubernetes.md)
+> [SQL Server container in Kubernetes](tutorial-sql-server-containers-kubernetes.md)

docs/linux/sql-server-ag-kubernetes.md

@@ -15,55 +15,62 @@ ms.technology: linux
 
 # High availability for SQL Server containers
 
-SQL Server workloads on containers can provide high availability with container orchestration through [Kubernetes](http://kubernetes.io/).
+Create and manage your SQL Server instances natively in Kubernetes.
 
-Two deployment patterns on Kubernetes can provide high availability for SQL Server.
+You can [deploy SQL Server to docker containers](tutorial-sql-server-ag-kubernetes.md) managed by [Kubernetes](https://kubernetes.io/). In Kubernetes, a container with a SQL Server instance to automatically recover in case a cluster node fails. For faster recovery, you can configure SQL Server Always On availability group with SQL Server instances in containers on a Kubernetes cluster. This article compares the two solutions.
 
-* [A SQL Server Always On availability group hosted on SQL Server containers in Kubernetes](tutorial-sql-server-ag-kubernetes.md).
+## Container with SQL Server instance on Kubernetes
 
-* [A SQL Server container with peristent storage](tutorial-sql-server-containers-kubernetes.md).
+Kubernetes 1.6 and later has support for [*storage classes*](http://kubernetes.io/docs/concepts/storage/storage-classes/), [*persistent volume claims*](http://kubernetes.io/docs/concepts/storage/storage-classes/#persistentvolumeclaims), and the [*Azure disk volume type*](https://github.com/kubernetes/examples/tree/master/staging/volumes/azure_disk). 
 
-## A SQL Server Always On availability group hosted on SQL Server containers in Kubernetes
+In this configuration, Kubernetes plays the role of the container orchestrator. 
+
+![Diagram of Kubernetes SQL Server cluster](media/tutorial-sql-server-containers-kubernetes/kubernetes-sql.png)
+
+In the preceding diagram, `mssql-server` is a SQL Server instance (container) in a [*pod*](http://kubernetes.io/docs/concepts/workloads/pods/pod/). A [replica set](http://kubernetes.io/docs/concepts/workloads/controllers/replicaset/) ensures that the pod is automatically recovered after a node failure. Applications connect to the service. In this case, the service represents a load balancer that hosts an IP address that stays the same after failure of the `mssql-server`.
+
+Kubernetes orchestrates the resources in the cluster. When a pod or node hosting a SQL Server instance in a container fails, the orchestrator bootstraps another container with a SQL Server instance and attaches it to the same persistent storage.
+
+## A SQL Server Always On availability group on SQL Server containers in Kubernetes
 
 SQL Server vNext supports availability groups on containers in a Kubernetes. For availability groups, deploy the SQL Server [Kubernetes operator](http://coreos.com/blog/introducing-operators.html) to your Kubernetes cluster. The operator helps package, deploy, and manage the availability group in a cluster.
 
 ![AG in Kubernetes Container](media/tutorial-sql-server-ag-containers-kubernetes/KubernetesCluster.png)
 
-In the image above, a four-node kubernetes clusters host an availability group with three replicas. The solution includes the following components:
+In the image above, a four-node kubernetes cluster hosts an availability group with three replicas. The solution includes the following components:
 
 * A Kubernetes [*deployment*](http://kubernetes.io/docs/concepts/workloads/controllers/deployment/). The deployment includes the operator and a configuration map. These provide the container image, software, and instructions required to deploy SQL Server instances for the availability group.
 
-* Three nodes, each hosting a [*StatefulSet*](http://kubernetes.io/docs/concepts/workloads/controllers/statefulset/). The StatefulSet contains a [*pod*](http://kubernetes.io/docs/concepts/workloads/pods/pod-overview/). Each pod contains:
+* Three nodes, each hosting a [*StatefulSet*](http://kubernetes.io/docs/concepts/workloads/controllers/statefulset/). The StatefulSet contains a pod. Each pod contains:
   * A SQL Server container running one instance of SQL Server.
-  * An availability group agent. 
+  * An availability group agent.
 
 * Two [*ConfigMaps*](http://kubernetes.io/docs/tasks/configure-pod-container/configure-pod-configmap/) related to the availability group. The ConfigMaps provide information about:
   * The deployment for the operator.
   * The availability group.
 
- * [*Persistent volumes*](http://kubernetes.io/docs/concepts/storage/persistent-volumes/) are pieces of storage. A *persistent volume claim* (PVC) is a request for storage by a user. Each container is affiliated with a PVC for the data and log storage. In Azure Kubernetes Service (AKS), you [create a persistent volume claim](http://docs.microsoft.com/azure/aks/azure-disks-dynamic-pv) to automatically provision storage based on a storage class.
-
+ * Persistent volumes for each instance of SQL Server provide the storage for the data and log files.
 
 In addition, the cluster stores [*secrets*](http://kubernetes.io/docs/concepts/configuration/secret/) for the passwords, certificates, keys, and other sensitive information.
 
-## SQL Server container with persistent storage
+## Compare SQL Server high availabiltiy on containers with and without the availability group
 
-Kubernetes 1.6 and later has support for [storage classes](http://kubernetes.io/docs/concepts/storage/storage-classes/), [persistent volume claims](http://kubernetes.io/docs/concepts/storage/storage-classes/#persistentvolumeclaims), and the [Azure disk volume type](https://github.com/kubernetes/examples/tree/master/staging/volumes/azure_disk). You can create and manage your SQL Server instances natively in Kubernetes. The example in this article shows how to create a [deployment](https://kubernetes.io/docs/concepts/workloads/controllers/deployment/) to achieve a high availability configuration similar to a shared disk failover cluster instance. In this configuration, Kubernetes plays the role of the cluster orchestrator. When a SQL Server instance in a container fails, the orchestrator bootstraps another instance of the container that attaches to the same persistent storage.
+The following table compairs the high SQL Server availability capability containers on Kubernetes with, and without an availabilty group:
 
-![Diagram of Kubernetes SQL Server cluster](media/tutorial-sql-server-containers-kubernetes/kubernetes-sql.png)
-
-In the preceding diagram, `mssql-server` is a container in a [pod](http://kubernetes.io/docs/concepts/workloads/pods/pod/). Kubernetes orchestrates the resources in the cluster. A [replica set](http://kubernetes.io/docs/concepts/workloads/controllers/replicaset/) ensures that the pod is automatically recovered after a node failure. Applications connect to the service. In this case, the service represents a load balancer that hosts an IP address that stays the same after failure of the `mssql-server`.
-
-In the following diagram, the `mssql-server` container has failed. As the orchestrator, Kubernetes guarantees the correct count of healthy instances in the replica set, and starts a new container according to the configuration. The orchestrator starts a new pod on the same node, and `mssql-server` reconnects to the same persistent storage. The service connects to the re-created `mssql-server`.
-
-![Diagram of Kubernetes SQL Server cluster](media/tutorial-sql-server-containers-kubernetes/kubernetes-sql-after-pod-fail.png)
-
-In the following diagram, the node hosting the `mssql-server` container has failed. The orchestrator starts the new pod on a different node, and `mssql-server` reconnects to the same persistent storage. The service connects to the re-created `mssql-server`.
-
-![Diagram of Kubernetes SQL Server cluster](media/tutorial-sql-server-containers-kubernetes/kubernetes-sql-after-node-fail.png)
+| |With an availability group | Standalone container instance
+|:------|:------|:------
+|Automatically recover from node failure | Yes | Yes
+|Automatically recover from pod failure | Yes | Yes
+|Faster failover |Yes |
+|Automatically recover from SQL Server instance failure | Yes | 
+|Automatically recover from database health check failure | Yes | 
+|Provide read-only replicas | Yes |
+|Secondary replica backup | Yes | 
 
 ## Next steps
 
-[Configure a SQL Server container in Kubernetes for high availability](tutorial-sql-server-containers-kubernetes.md)
+To deploy SQL Server containers in Azure Kubernetes Service (AKS), follow one of these tutorials:
+
+* [Deploy a SQL Server container in Kubernetes](tutorial-sql-server-containers-kubernetes.md).
+* [Deploy a SQL Server Always On availability group Kubernetes](tutorial-sql-server-ag-kubernetes.md).
 
-[Configure a SQL Server Always On availability group on Docker containers in Kubernetes with Azure Kubernetes Service (AKS)](tutorial-sql-server-ag-kubernetes.md)