ADD avidns documentation

src/deployment-guides/tkg-avi-dns.md

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+# AVI DNS Virtual Service with Tanzu Kubernetes Grid 
+
+The Purpose of the Document is to demonstrate how we can leverage AVI DNS Virtual Service to as a DNS Server for workload application.For More information Please refer [**Product Documentation**](https://docs.vmware.com/en/VMware-Tanzu-Mission-Control/services/tanzumc-using/GUID-EF35646D-8762-41F1-95E5-D2F35ED71BA1.html) .
+
+AVI DNS Virtual Service is available only in **AVI Enterprise** license or more.For more information about AVI DNS Architecture please refer product [documentation](https://avinetworks.com/docs/latest/avi-dns-architecture/) 
+
+## General Instructions for Installing AVI DNS and L7 Ingress Service Provider.
+
+NSX ALB as in **L7 Ingress Service Provider**
+
+We will be Deploying NSX ALB L7 ingress in NodePortLocal mode in our infrastructure, For more information please refer NSX ALB as in L4+L7 Ingress Service Provider Session in Reference Architecture.
+
+
+Link will be given here to our RA 
+
+L7 functionality will be enabled using AKO configuration files as part of the Management cluster deployment. 
+
+Deployment file will given here for reference.
+### Create a Service Engine Group.
+To create or edit an SE group:
+
+1. Select Infrastructure > **Cloud Resources** and click on the cloud name (for example, sfow01vc01).
+2. Click on **CREATE** 
+
+   * Update the Service Engine Group Name.
+   * Select High Availability to Active/Active.
+   * VS Placement across Service Engines should be Compact.
+### Update IPAM Profile
+
+We will be using **sfo01-w01-vds01-albmanagement** network for DNS virtual Service IP.
+
+Navigate to **Templates** > **IPAM/DNS Profiles** and Edit the IPAM Profile.
+
+Add the Network by selecting cloud under **Cloud** > **ADD** Select **sfo01-w01-vds01-albmanagement** > **SAVE**
+
+### Configuring DNS Virtual Service
+
+Starting with release 18.1.2, the DNS virtual service can be configured with IPv4 VIP, IPv6 VIP, or a dual VIP.
+
+Navigate to **Applications** > **Virtual Services** and click on **CREATE VIRTUAL SERVICE** (Advanced Setup) Select the Cloud Click **NEXT**. Configuration tabs associated with DNS are as explained below.
+
+Settings
+*  Update **Name**
+*  VS 
+*  **Application Profiles** Select Select System-DNS.
+*  **TCP/UDP Profile** Select System-UDP-Per-Pkt.
+*  In **VS VIP**  Select **Create VS VIP** Enter Name & under **General** Select **ADD** to add **VIP**
+   * **Enable VIP**
+   * **Private IP** > **Auto-Allocate**
+   * **IP Protocol** > **V4 Only**
+   * **VIP Address Allocation Network** > **sfo01-w01-vds01-albmanagement**
+   * **IPv4 Subnet** > Select the Defined network
+* Click **SAVE**
+
+### Configuring DNS Name
+
+DNS Profile will be created as part of the Management cluster creation.
+
+Navigate to **Templates** > **IPAM/DNS Profiles** and Select the DNS **Virtual Service**
+by using the drop-down option.
+
+* Update the DNS Name for AVI DNS by Selecting **ADD** > **SAVE**
+
+### Update AVI DNS Service
+
+Navigate to **Administration** > **DNS Service** and Select the DNS profile **Click** on pencil icon to **EDIT**.