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Azure Active Directory Domain Services

What is Azure Active Directory Domain Services?

Azure Active Directory Domain Services enables organizations to use domains services such as domain joining, Group Policies, LDAP, Kerberos/NTLM authentication same as the on-premises windows based active directory.

Azure active directory domain services extend Azure AD to support DNS name resolution, Custom Organizational Units, Kerberos, NTLM, Group Policy, domain joining, LDAP bind or read and Secure LDAP. With managed domain as the name suggests we can use domain services without the need of deploying, managing or patching domain controllers.

 

What are the prerequisites?

To deploy azure ADDS following resources and privileges are required:

·         An Azure Subscription,

·         Azure AD tenant associated to the subscription, the tenant either be synchronized with an on-premises directory or cloud-only directory. For our demo purpose, I will use the cloud-only directory,

·         Global administrator privilege on the tenant to deploy Azure ADDS,

·         And Contributor privilege on the subscription

 

What are the advantages?

·     Easy to deploy: Azure AD Domain services can be enabled with a single wizard on the Azure portal, without the need of deployment of domain controllers and it’s management.

·    High Availability, managed domains are Azure service with an uptime of 99.9 % SLA.

·   With Kerberos/NTLM Authentication support, you can deploy any application or workload, those have a dependency on legacy authentication protocol.

·     In-Built DNS Update, same as on-premises AD, the managed domain is also highly dependent on DNS for name resolution, Azure AD Domain Services comes with in-built DNS records and updates. You do not need to managed DNS separately.

·       Microsoft manages the Domain Controllers including the deployment, backup, and restoration.

 

What are the limitations?

Since it is managed domain, it comes with certain limitations:

·    Lack of control, you do not get domain admin or enterprise admin privileges. For any application installation requires such access are of the list for example ADFS or Exchange

·         Kerberos delegation is not possible.

·         Custom GPOs are not allowed.

·      One way sync, any custom object created under the managed domain will not be reflected in Azure AD.

Custom schema extension is not supported.


Next:

How to Configured Azure AD Domain Service – Step by Step

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