Tutorial: Create an alias record to refer to an Azure public IP address

  • Article

You can create an alias record to reference an Azure resource. An example is an alias record that references an Azure public IP resource.

In this tutorial, you learn how to:

  • Create a virtual network and a subnet.
  • Create a web server virtual machine with a public IP.
  • Create an alias record that points to the public IP.
  • Test the alias record.

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

Prerequisites

  • An Azure account with an active subscription.
  • A domain name hosted in Azure DNS. If you don't have an Azure DNS zone, you can create a DNS zone, then delegate your domain to Azure DNS.

Note

In this tutorial, contoso.com is used as an example domain name. Replace contoso.com with your own domain name.

Sign in to Azure

Sign in to the Azure portal.

Create the network infrastructure

Create a virtual network and a subnet to place your web server in.

  1. In the Azure portal, enter virtual network in the search box at the top of the portal, and then select Virtual networks from the search results.

  2. In Virtual networks, select + Create.

  3. In Create virtual network, enter or select the following information in the Basics tab:

    Setting Value
    Project Details
    Subscription Select your Azure subscription.
    Resource Group Select Create new.
    In Name, enter PIPResourceGroup.
    Select OK.
    Instance details
    Name Enter myPIPVNet.
    Region Select your region.

  4. Select the IP Addresses tab or select the Next: IP Addresses button at the bottom of the page.

  5. In the IP Addresses tab, enter the following information:

    Setting Value
    IPv4 address space Enter 10.10.0.0/16.

  6. Select + Add subnet, and enter this information in the Add subnet:

    Setting Value
    Subnet name Enter WebSubnet.
    Subnet address range Enter 10.10.0.0/24.

  7. Select Add.

  8. Select the Review + create tab or select the Review + create button.

  9. Select Create.

Create a web server virtual machine

Create a Windows Server virtual machine and then install IIS web server on it.

Create the virtual machine

Create a Windows Server 2019 virtual machine.

  1. In the Azure portal, enter virtual machine in the search box at the top of the portal, and then select Virtual machines from the search results.

  2. In Virtual machines, select + Create and then select Azure virtual machine.

  3. In Create a virtual machine, enter or select the following information in the Basics tab:

    Setting Value
    Project Details
    Subscription Select your Azure subscription.
    Resource Group Select PIPResourceGroup.
    Instance details
    Virtual machine name Enter Web-01.
    Region Select (Asia Pacific) China North 2.
    Availability options Select No infrastructure redundancy required.
    Security type Select Standard.
    Image Select Windows Server 2019 Datacenter - Gen2.
    Size Select your VM size.
    Administrator account
    Username Enter a username.
    Password Enter a password.
    Confirm password Reenter the password.
    Inbound port rules
    Public inbound ports Select None.

  4. Select the Networking tab, or select Next: Disks, then Next: Networking.

  5. In the Networking tab, enter or select the following information:

    Setting Value
    Network interface
    Virtual network Select myPIPVNet.
    Subnet Select WebSubnet.
    Public IP Take the default public IP.
    NIC network security group Select Basic.
    Public inbound ports Select Allow selected ports.
    Select inbound ports Select HTTP (80), HTTPS (443) and RDP (3389).

  6. Select Review + create.

  7. Review the settings, and then select Create.

This deployment may take a few minutes to complete.

Note

Web-01 virtual machine has an attached NIC with a basic dynamic public IP that changes every time the virtual machine is restarted.

Install IIS web server

Install IIS web server on Web-01.

  1. In the Overview page of Web-01, select Connect and then RDP.

  2. In the RDP page, select Download RDP File.

  3. Open Web-01.rdp, and select Connect.

  4. Enter the username and password entered during virtual machine creation.

  5. On the Server Manager dashboard, select Manage then Add Roles and Features.

  6. Select Server Roles or select Next three times. On the Server Roles screen, select Web Server (IIS).

  7. Select Add Features, and then select Next.

    Screenshot of Add Roles and Features Wizard in Windows Server 2019 showing how to install the I I S Web Server by adding Web Server role.

  8. Select Confirmation or select Next three times, and then select Install. The installation process takes a few minutes to finish.

  9. After the installation finishes, select Close.

  10. Open a web browser. Browse to localhost to verify that the default IIS web page appears.

    Screenshot of Internet Explorer showing the I I S Web Server default web page.

Create an alias record

Create an alias record that points to the public IP address.

  1. In the Azure portal, enter contoso.com in the search box at the top of the portal, and then select contoso.com DNS zone from the search results.

  2. In the Overview page, select the + Record set button.

  3. In the Add record set, enter web01 in the Name.

  4. Select A for the Type.

  5. Select Yes for the Alias record set, and then select the Azure Resource for the Alias type.

  6. Select the Web-01-ip public IP address for the Azure resource.

  7. Select OK.

    Screenshot of adding an alias record to refer to the Azure public IP of the I I S web server using the Add record set page.

Test the alias record

  1. In the Azure portal, enter virtual machine in the search box at the top of the portal, and then select Virtual machines from the search results.
  2. Select the Web-01 virtual machine. Note the public IP address in the Overview page.
  3. From a web browser, browse to web01.contoso.com, which is the fully qualified domain name of the Web-01 virtual machine. You now see the IIS default web page.
  4. Close the web browser.
  5. Stop the Web-01 virtual machine, and then restart it.
  6. After the virtual machine restarts, note the new public IP address for the virtual machine.
  7. From a web browser, browse again to web01.contoso.com.

This procedure succeeds because you used an alias record to point to the public IP resource instead of a standard A record that points to the public IP address, not the resource.

Clean up resources

When no longer needed, you can delete all resources created in this tutorial by following these steps:

  1. On the Azure portal menu, select Resource groups.
  2. Select the PIPResourceGroup resource group.
  3. On the Overview page, select Delete resource group.
  4. Enter PIPResourceGroup and select Delete.
  5. On the Azure portal menu, select All resources.
  6. Select contoso.com DNS zone.
  7. On the Overview page, select the web01 record created in this tutorial.
  8. Select Delete and then Yes.

Next steps

In this tutorial, you learned how to create an alias record to refer to an Azure public IP address resource. To learn how to create an alias record to support an apex domain name with Traffic Manager, continue with the next tutorial:

Create alias records for Traffic Manager