Lab 06: Implement Traffic Management

Configure and test both an Azure Load Balancer (Layer 4) and an Azure Application Gateway (Layer 7) for distributing traffic to web servers.

Scenario: Your organization hosts a public website. You need to load balance incoming traffic across multiple virtual machines (VMs) for high availability. Additionally, you want to route requests for images and videos to different backend servers based on the URL path.

Key Concepts:

Azure Load Balancer: Distributes network traffic at Layer 4 (TCP/UDP). Provides high availability and scalability.
Azure Application Gateway: A web traffic load balancer (Layer 7) that can make routing decisions based on URL path, host headers, and other HTTP attributes. Offers features like Web Application Firewall (WAF).
Frontend IP Configuration: The public or private IP address that clients use to access the load-balanced service.
Backend Pool: The group of VMs or other resources that receive the traffic from the load balancer.
Health Probes: Checks the health of backend instances to ensure traffic is only sent to healthy servers.
Load Balancing Rules: Define how incoming traffic is distributed to the backend pool based on port, protocol, and other criteria.
Listener (Application Gateway): Listens for incoming traffic on a specific port and protocol.
Routing Rule (Application Gateway): Connects a listener to a backend pool and defines how traffic is routed based on URL path or other criteria.

Lab Tasks :

Diagram of the lab tasks.

Job skills

Task 1: Use a template to provision an infrastructure.
Task 2: Configure an Azure Load Balancer.
Task 3: Configure an Azure Application Gateway.

Task 1: Provision Infrastructure (Template)

Download Lab Files: Download the \Allfiles\Lab06 files (template and parameters). These should include az104-06-vms-template.json and az104-06-vms-parameters.json.
Deploy Custom Template:
- Search for and select "Deploy a custom template" and choose "Build your own template in the editor."
- Click "Load file" and select az104-06-vms-template.json and click "Save."
- Click "Edit parameters" and load the az104-06-vms-parameters.json file and click "Save."
- Basics:
  - Subscription: (Select your subscription)
  - Password: (Provide a strong password)

Screenshot of the create load balancer page.

Wait for Deployment: The deployment will take about 5 minutes. Do not proceed until it's complete. You can review the resources being created (1 VNet, 3 subnets, 2 VMs, 1 NSG).

Task 2: Configure Azure Load Balancer

Create Load Balancer: Search for and select "Load balancers" and click "+ Create."
- Basics:
  - Subscription: (Your subscription)
  - Resource Group: az104-rg6
  - Name: az104-lb
  - SKU: Standard
  - Type: Public
  - Tier: Regional
- Select Next: Frontend IP configuration.
Frontend IP Configuration:
- Click "Add a frontend IP configuration."
  - Name: az104-fe
  - IP type: IP address
  - Click Create new under the Public IP address section. Use the following and click OK.
    - Name: az104-lbpip
    - SKU: Standard
    - Tier: Regional
    - Assignment: Static
- Select Next: Backend pools.
Backend Pool:
- Click "Add a backend pool."
  - Name: az104-be
  - Virtual network: az104-06-vnet1
  - Backend Pool Configuration: NIC
- Select Add.
  - Add both az104-06-vm0 and az104-06-vm1 to the backend pool (check the boxes).
- Click "Add" (to add the VMs)
- Click Add (to create the backend pool).
- Select Next: Inbound Rules.
Load Balancing Rule:

Click "+ Add a load balancing rule."
- Name: az104-lbrule
- IP Version: IPv4
- Frontend IP address: az104-fe
- Backend pool: az104-be
- Protocol: TCP
- Port: 80
- Backend port: 80
- Health probe: Click "Create new."
  - Name: az104-hp
  - Protocol: TCP
  - Port: 80
  - Interval: 5
  - Click "OK."
- Session persistence: None
- Idle timeout (minutes): 4
- TCP reset: Disabled
- Floating IP: Disabled *Outbound source network address translation (SNAT): Recommended
Review + create: verify, and create.

Wait for Deployment and Go to Resource: Wait for the load balancer to deploy, then click "Go to resource."

Test Load Balancer: * Locate the Load Balancer in the portal. * In Settings, Select Frontend IP Configuration. * Copy the Public IP address from the Frontend IP configuration. * Open a new browser tab and paste the IP address. You should see "Hello World from az104-06-vm0" or "Hello World from az104-06-vm1." * Refresh the page several times (or open a new InPrivate/Incognito window). The message should alternate between the two VMs, demonstrating load balancing.

Task 3: Configure Azure Application Gateway

Diagram of the lab tasks.

Add Subnet:
- Find az104-06-vnet1 and under "Settings," select "Subnets."
- Click "+ Subnet."
  - Name: subnet-appgw
  - Starting address: 10.60.3.224/27 (This provides enough addresses for the Application Gateway)
- Click "Save."
Create Application Gateway:
- Search for and select "Application gateways."
- Click "+ Create."
- Basics:
  - Subscription: (Your subscription)
  - Resource Group: az104-rg6
  - Application gateway name: az104-appgw
  - Tier: Standard V2
  - Enable autoscaling: No
  - Minimum instance count: 2
  - Availability zone: 1 (default)
  - HTTP2: Disabled
  - Virtual network: az104-06-vnet1
  - Subnet: subnet-appgw (10.60.3.224/27)
- Click "Next: Frontends >."

Frontend Configuration:
- Frontend IP address type: Public
- Public IP address: Click "Add new."
  - Name: az104-gwpip
  - Click OK.
- Click "Next: Backends >."

Backend Pools:
- Click "Add a backend pool."
  - Name: az104-appgwbe
  - Add backend pool without targets: No
  - Add the virtual machines: Select the NICs of both VM's: az104-06-nic1 (10.60.1.4) and az104-06-nic2 (10.60.2.4)
  - Click "Add."
- Add an images backend pool:
  - Click "Add a backend pool."
  - Name: az104-imagebe
  - Add without targets: No
  - Add az104-06-nic1(10.60.1.4)
  - Click "Add".
- Add a videos backend pool:
  - Click "Add a backend pool."
  - Name: az104-videobe
  - Add without targets: No
  - Add az104-06-nic2(10.60.2.4)
  - Click "Add".

Configuration (Routing Rule):

Click "Next: Configuration >."
Click Add a routing rule
Click "Add a routing rule."
- Rule name: az104-gwrule
- Priority: 100
- Listener name: az104-listener
- Frontend IP: Public IPv4
- Protocol: HTTP
- Port: 80
- Listener type: Basic

witch to the Backend targets tab.

Backend Target: az104-appgwbe
Backend settings: Click "Add new."
- Backend Setting Name: az104-http
- Click "Add."

Under the Path-based routing section, select Add multiple targets to create a path-based rule

Add rule for images.
- Path: /image/*
- Target name: images
- Backend settings: az104-http
- Backend Target: az104-imagebe
- Select Add.
Add rule for videos.
Path: /video/*
- Target name: videos
- Backend settings: az104-http
- Backend Target: az104-videobe
- Select Add.
Click Save

Review and Create:

Clik "Next: Tags >" (no changes needed).
Click "Next: Review + create >," then click "Create."
Wait for Deployment: This will take 5-10 minutes.

Test Application Gateway:

Once deployed, go to the az104-appgw resource.
Check Backend Health (under "Monitoring"): Ensure both servers in the backend pool show Healthy.

On the "Overview" blade, copy the Frontend public IP address.
Test Image Routing: Open a new browser tab and go to http://<frontend ip address>/image/. You should be directed to the image server (vm1).
Test Video Routing: Open a new browser tab and go to http://<frontend ip address>/video/. You should be directed to the video server (vm2).
You may need to use InPrivate/Incognito windows or clear your cache to ensure you're seeing the correct routing.

Here is the task 3 in summary:

Create Subnet:
- In the Azure portal, add a subnet (subnet-appgw) to az104-06-vnet1 for the Application Gateway.
- Ensure the subnet size is /27 or larger.
Deploy Application Gateway:
- Use the Azure portal to create an Application Gateway (az104-appgw) with the following settings:
  - Resource Group: az104-rg6
  - Region: Same as Task 1
  - Tier: Standard V2
  - Virtual Network: az104-06-vnet1
  - Subnet: subnet-appgw
- Frontend IP: Create a public IP address (az104-gwpip).
Configure Backend Pools:
- Create backend pools to route traffic:
  - az104-appgwbe: General pool with both VMs (az104-06-nic1 and az104-06-nic2).
  - az104-imagebe: Routes images to VM (az104-06-nic1).
  - az104-videobe: Routes videos to VM (az104-06-nic2).
Add Routing Rules:
- Add routing rules for path-based traffic:
  - Rule for Images: Routes traffic with /image/* path to az104-imagebe.
  - Rule for Videos: Routes traffic with /video/* path to az104-videobe.

Lab 06: Implement Traffic Management

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