Map subdomain in Azure DNS Zone to website hosted on Azure VM (Cpanel)

Patrick Orville 0

I have a domain (xyz.org) on Azure DNS Zone that points to a website hosted on Azure App Service, and I created a subdomain (abc.xyz.org) but will like to point this subdomain to a website hosted on Azure Virtual Machine (Cpanel).

I already entered the subdomain as an A record with the IP address of the VM but no luck. This is an urgent situation. Any help please?

Ganesh Patapati 2,435 Reputation points Microsoft Vendor

2024-11-26T10:53:33.4266667+00:00
Hi Patrick Orville

Greetings!

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.

Please follow the steps mentioned below to add your Custom Domain to VM as alias.

When you create a virtual machine in the Azure portal, a public IP resource for the virtual machine is automatically created. Your public IP address is shown in VM overview page.

Shows the public IP address in the essentials section of the VM overview page.

If you select the IP address you can see more information on it. Check to make sure your IP Assignment is set to Static. A static IP address will not change if the VM or resource reboots or shuts down.

Shows the public IP configuration so you can see if the IP address is static.

If your IP Address is not static, you will need to create an FQDN.

Select your VM in the portal.

In the left menu, select Properties

Under Public IP address\DNS name label, select your IP address.

Under DNS name label, enter the prefix you want to use.

Select Save at the top of the page.

Select Overview in the left menu to return to the VM overview blade.

Verify that the DNS name appears correctly.

Open a browser and enter your IP address or FQDN and verify that it shows the web content running on your VM.

After verifying your static IP or FQDN, go to your domain provider and navigate to DNS settings. Once there add an A record pointing to your Public IP Address or FQDN. For example, the procedure for the GoDaddy domain registrar / Azure Domain Service is as follows:

Sign in and select the custom domain you want to use.

In the Domains section, select Manage All, then select DNS | Manage Zones.

For Domain Name, enter your custom domain, then select Search.

From the DNS Management page, select Add, then select A in the Type list.

Complete the fields of the A entry:

Type: Leave A selected.

Host: Enter @

Points to: Enter the Public IP Address or FQDN of your VM.

TTL: Leave one hour selected.

Select Save.

The A record entry is added to the DNS records table.

How to create a DNS Zone in Azure?

Create a DNS zone

Go to the Azure portal to create a DNS zone. Search for and select DNS zones.

DNS zone

Select Create DNS zone.

On the Create DNS zone page, enter the required values, and then select Create.

Use the Above NameServer and update it on your Custom Domain Purchased from Azure Domain Services

Go to Azure Domain

Select your Domain

Go to Advance Management

Go to DNS and add the new Name Servers and save the changes

After the Changes has been performed, add the Alias by going to your Virtual Machine's VNet > Configuration > Create Alias Record and Add your "@" and "www" record to your domain.

After the record is created it usually takes about an hour for DNS propagate, but it can sometimes take up to 48 hours.

After performing the above all the actions still you are facing the issue please let me know what exact error you are facing in terms of screenshot.

Hope this clarifies!

If above is unclear and/or you are unsure about something add a comment below.

Please don’t forget to close the thread by clicking "Accept the answer" wherever the information provided helps you, as this can be beneficial to other community members.

Regards,

Ganesh
Patrick Orville 0 Reputation points

2024-11-27T01:43:21.9333333+00:00

Thank you for your advice, Ganesh. I followed the steps but I hit a wall with the page not found error
KapilAnanth-MSFT 47,996 Reputation points Microsoft Employee

2024-11-27T09:19:40.91+00:00
@Patrick Orville ,

May I ask if you purchased the custom Domain from App Service

Or not?

Refer : Buy an App Service domain and configure an app with it

If yes,

Can you please share the DNS Zone name and the custom AppService FQDN in the private messages I have initiated.

Are you using the root/apex or "www" for redirecting traffic towards AppService?

Do you see the domain when you search for "App Service Domain" in Azure Portal?

If not, are you sure the DNS Zone is delegated to Azure

Delegation of DNS zones with Azure DNS

Please check private messages.

P.S :

App Service Domains and DNS Zones are not the same

Please verify whether or not you it in App Service Domains under Portal?

Cheers,

Kapil
Patrick Orville 0 Reputation points

2024-11-28T06:56:11.5133333+00:00

Hello @KapilAnanth-MSFT , I have replied to your private message.
Ganesh Patapati 2,435 Reputation points Microsoft Vendor

2024-11-29T16:08:41.3866667+00:00

Hello Patrick Orville

We appreciate your patience!

Please don’t forget to close the thread by clicking "Accept the answer" wherever the information helps you, as this can be beneficial to other community members.

Your contribution is greatly appreciated.

Regards,

Ganesh

1 answer

KapilAnanth-MSFT 47,996 Reputation points Microsoft Employee

2024-11-28T07:31:58.6133333+00:00
@Patrick Orville , Thanks for the detailed explanation.

I understand,

You have a domain, "contoso.com" which is properly delegated to Azure

Now, you want to create a child domain, called "subdomain.contoso.com" and delegate this not to Azure, but to a third party software called cPanel residing inside VM.

For this,

You created an A record in "contoso.com" with "subdomain" and pointed this to the VM's IP

Then you also created a NS Record for "subdomain" in the DNS Zone "contoso.com"" with 4 name servers.

Correct me if I am wrong.

First of all, Are you sure these steps are valid?

Where did the 4 name servers for "subdomain" record came from?

Is it the name servers of "contoso.com"?

This is how a child Zone delegation works in Azure : Create a child DNS zone

Note that the Child Zone has a different set of name servers than the parent

The same concept goes for any DNS Host, so, in your case, the third party should provide you the name servers to host "subdomain.contoso.com"

You should not use the Parent Domain's name servers.

Additionally, See : Is a subdomain with both A records and NS records valid?

If you want to delegate/host the ChildZone with a different vendor,

In the parent Zone, "contoso.com", add an NS record of name "subdomain" pointing to the name servers provided by them.

And use an Apex record or "@" to resolve "subdomain.contoso.com" to any IP you want

Hope this clarifies.

Thanks,

Kapil

Please don’t forget to close the thread by clicking "Accept the answer" wherever the information provided helps you, as this can be beneficial to other community members.
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Ganesh Patapati 2,435 Reputation points Microsoft Vendor

2024-12-02T14:11:43.72+00:00

Hello Patrick Orville

We appreciate your patience!

Please don’t forget to close the thread by clicking "Accept the answer" wherever the information helps you, as this can be beneficial to other community members.

Your contribution is greatly appreciated.

Regards,

Ganesh
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Map subdomain in Azure DNS Zone to website hosted on Azure VM (Cpanel)

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