Tutorial: Control traffic routing with weighted endpoints by using Traffic Manager

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This tutorial describes how to use Azure Traffic Manager to control routing of user traffic between endpoints by using the weighted routing method. In this routing method, you assign weights to each endpoint in the Traffic Manager profile configuration. User traffic is then routed based on the weight assigned to each endpoint. The weight is an integer from 1 to 1,000. The higher the weight value assigned to an endpoint, the higher its priority.

In this tutorial, you learn how to:

  • Create two VMs running a basic website on IIS.
  • Create two test VMs to view Traffic Manager in action.
  • Configure a DNS name for the VMs running IIS.
  • Create a Traffic Manager profile.
  • Add VM endpoints to the Traffic Manager profile.
  • View Traffic Manager in action.

If you don't have an Azure subscription, create a trial subscription before you begin.

Prerequisites

To see Traffic Manager in action, deploy the following for this tutorial:

  • Two instances of basic websites running in different Azure regions: China East and China North.
  • Two test VMs for testing Traffic Manager: one in China East and the other in China North. The test VMs are used to illustrate how Traffic Manager routes user traffic to a website that has higher weight assigned to its endpoint.

Sign in to Azure

Sign in to the Azure portal.

Create websites

In this section, you create two website instances that provide the two service endpoints for the Traffic Manager profile in two Azure regions. To create the two websites, complete the following steps:

  1. Create two VMs for running a basic website: one in China East, and the other in China North.
  2. Install an IIS server on each VM. Update the default webpage that describes the VM name that a user is connected to when visiting the website.

Create VMs for running websites

In this section, you create two VMs (myIISVMChinaEast and myIISVMChinaNorth) in the China East and China North Azure regions.

  1. On the upper, left corner of the Azure portal, select Create a resource， search Windows Server 2019 Datacenter in the New page, then select Windows Server 2019 Datacenter in search results and select Create.

  2. In Create a virtual machine, type or select the following values in the Basics tab:

    • Subscription > Resource Group: Select Create new and then type myResourceGroupTM1.
    • Instance Details > Virtual machine name: Type myIISVMChinaEast.
    • Instance Details > Region: Select China East.
    • Administrator Account > Username: Enter a user name of your choosing.
    • Administrator Account > Password: Enter a password of your choosing. The password must be at least 12 characters long and meet the defined complexity requirements.
    • Inbound Port Rules > Public inbound ports: Select Allow selected ports.
    • Inbound Port Rules > Select inbound ports: Select RDP and HTTP from the drop-down list.

  3. Select the Management tab, or select Next: Disks, then Next: Networking, then Next: Management. Under Monitoring, set Boot diagnostics to Off.

  4. Select Review + create.

  5. Review the settings, and then click Create.

  6. Follow the steps to create a second VM named myIISVMChinaNorth, with a Resource group name of myResourceGroupTM2, a location of China North, and all the other settings the same as myIISVMChinaEast.

  7. The VMs take a few minutes to create. Do not continue with the remaining steps until both VMs are created.

Create a VM

Install IIS and customize the default webpage

In this section, you install the IIS server on the two VMs myIISVMChinaEast and myIISVMChinaNorth, and then update the default webpage. The customized webpage shows the name of the VM that you're connecting to when you visit the website from a web browser.

  1. Select All resources on the left menu. From the resource list, select myIISVMChinaEast in the myResourceGroupTM1 resource group.

  2. On the Overview page, select Connect. In Connect to virtual machine, select Download RDP file.

  3. Open the .rdp file you downloaded. If you're prompted, select Connect. Enter the user name and password that you specified when you created the VM. You might need to select More choices > Use a different account, to specify the credentials that you entered when you created the VM.

  4. Select OK.

  5. You might receive a certificate warning during the sign-in process. If you receive the warning, select Yes or Continue to proceed with the connection.

  6. On the server desktop, browse to Windows Administrative Tools > Server Manager.

  7. Open Windows PowerShell on VM1. Use the following commands to install the IIS server and update the default .htm file.

    # Install IIS
Install-WindowsFeature -name Web-Server -IncludeManagementTools

# Remove default .htm file
remove-item C:\inetpub\wwwroot\iisstart.htm

#Add custom .htm file
Add-Content -Path "C:\inetpub\wwwroot\iisstart.htm" -Value $("Hello World from " + $env:computername)

    Install IIS and customize the webpage

  8. Close the RDP connection with myIISVMChinaEast.

  9. Repeat steps 1-8. Create an RDP connection with the VM myIISVMChinaNorth within the myResourceGroupTM2 resource group, to install IIS and customize its default webpage.

Configure DNS names for the VMs running IIS

Traffic Manager routes user traffic based on the DNS name of the service endpoints. In this section, you configure the DNS names for the IIS servers myIISVMChinaEast and myIISVMChinaNorth.

  1. Select All resources on the left menu. From the resource list, select myIISVMChinaEast in the myResourceGroupTM1 resource group.
  2. On the Overview page, under DNS name, select Configure.
  3. On the Configuration page, under the DNS name label, add a unique name. Then select Save.
  4. Repeat steps 1-3 for the VM named myIISVMChinaNorth in the myResourceGroupTM2 resource group.

Create a test VM

In this section, you create a VM (myVMChinaEast and myVMChinaNorth) in each Azure region (China East and China North). You will use these VMs to test how Traffic Manager routes traffic to the website endpoint that has the higher weight value.

  1. On the upper, left corner of the Azure portal, select Create a resource ， Enter Windows Server 2019 Datacenter in search filter of New page, then press the Enter key.

  2. In Create a virtual machine, type or select the following values in the Basics tab:

    • Subscription > Resource Group: Select myResourceGroupTM1.
    • Instance Details > Virtual machine name: Type myVMChinaEast.
    • Instance Details > Region: Select China East.
    • Administrator Account > Username: Enter a user name of your choosing.
    • Administrator Account > Password: Enter a password of your choosing. The password must be at least 12 characters long and meet the defined complexity requirements.
    • Inbound Port Rules > Public inbound ports: Select Allow selected ports.
    • Inbound Port Rules > Select inbound ports: Select RDP from the drop-down box.

  3. Select the Management tab, or select Next: Disks, then Next: Networking, then Next: Management. Under Monitoring, set Boot diagnostics to Off.

  4. Select Review + create.

  5. Review the settings, and then click Create.

  6. Follow the steps to create a second VM named myVMChinaNorth, with a Resource group name of myResourceGroupTM2, a location of China North, and all the other settings the same as myVMChinaEast.

  7. The VMs take a few minutes to create. Do not continue with the remaining steps until both VMs are created.

Create a Traffic Manager profile

Create a Traffic Manager profile based on the Weighted routing method.

  1. On the upper-left side of the screen, select Create a resource > Networking > See All > Traffic Manager profile > Create.

  2. In Create Traffic Manager profile, enter or select the following information. Accept the defaults for the other settings, and then select Create.

    Setting Value
    Name Enter a unique name within the trafficmanager.cn zone. It results in the DNS name trafficmanager.cn, which is used to access your Traffic Manager profile.
    Routing method Select the Weighted routing method.
    Subscription Select your subscription.
    Resource group Select Use existing and then select myResourceGroupTM1.

    Create a Traffic Manager profile

Add Traffic Manager endpoints

Add the two VMs running the IIS servers myIISVMChinaEast and myIISVMChinaNorth, to route user traffic to them.

  1. In the portal's search bar, search for the Traffic Manager profile name that you created in the preceding section. Select the profile in the results that are displayed.

  2. In Traffic Manager profile, in the Settings section, select Endpoints > Add.

  3. Enter or select the following information. Accept the defaults for the other settings, and then select OK.

    Setting Value
    Type Enter the Azure endpoint.
    Name Enter myChinaEastEndpoint.
    Target resource type Select Public IP address.
    Target resource Choose a public IP address to show the listing of resources with public IP addresses under the same subscription. In Resource, select the public IP address named myIISVMChinaEast-ip. This is the public IP address of the IIS server VM in China East.
    Weight Enter 100.

  4. Repeat steps 2 and 3 to add another endpoint named myChinaNorthEndpoint for the public IP address myIISVMChinaNorth-ip. This address is associated with the IIS server VM named myIISVMChinaNorth. For Weight, enter 25.

  5. When the addition of both endpoints is complete, they're displayed in the Traffic Manager profile along with their monitoring status as Online.

Test the Traffic Manager profile

To view Traffic Manager in action, complete the following steps:

  1. Determine the DNS name of your Traffic Manager profile.
  2. View Traffic Manager in action.

Determine DNS name of Traffic Manager profile

In this tutorial, for simplicity, you use the DNS name of the Traffic Manager profile to visit the websites.

You can determine the DNS name of the Traffic Manager profile as follows:

  1. In the portal's search bar, search for the Traffic Manager profile name that you created in the preceding section. In the results that are displayed, select the Traffic Manager profile.

  2. Select Overview.

  3. The Traffic Manager profile displays its DNS name. In production deployments, you configure a vanity domain name to point to the Traffic Manager domain name, by using a DNS CNAME record.

    Traffic Manager DNS name

View Traffic Manager in action

In this section, you can see Traffic Manager in action.

  1. Select All resources on the left menu. From the resource list, select myVMChinaEast in the myResourceGroupTM1 resource group.

  2. On the Overview page, select Connect. In Connect to virtual machine, select Download RDP file.

  3. Open the .rdp file you downloaded. If you're prompted, select Connect. Enter the user name and password that you specified when creating the VM. You might need to select More choices > Use a different account, to specify the credentials that you entered when you created the VM.

  4. Select OK.

  5. You might receive a certificate warning during the sign-in process. If you receive the warning, select Yes or Continue to proceed with the connection.

  6. In a web browser on the VM myVMChinaEast, enter the DNS name of your Traffic Manager profile to view your website. You're routed to website hosted on the IIS server myIISVMChinaEast because it's assigned a higher weight of 100. The IIS server myIISVMChinaNorth is assigned a lower endpoint weight value of 25.

    Test Traffic Manager profile

  7. Repeat steps 1-6 on the VM myVMChinaNorth to see the weighted website response.

Clean up resources

When you no longer need the resource groups that you created in this tutorial, you can delete them. To do so, select the resource group (ResourceGroupTM1 or ResourceGroupTM2), and then select Delete.

Next steps

To learn more about routing methods, see:

Traffic routing method