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The first step in deploying domain controllers in Azure is to provision virtual machines that will run Active Directory Domain Services. You must choose the right VM size and storage to handle the directory workload, and place each VM in the correct virtual network and subnet so it can communicate with other domain controllers and with on-premises resources. The network configuration matters because domain controllers need to replicate data between each other, and they also need to answer authentication requests from users and computers both in Azure and on your local network. Without proper network setup, the domain controllers cannot synchronize directory data or authenticate users effectively.
High availability ensures that your directory services stay online even if a single Azure datacenter has a problem. You achieve this by using availability sets or availability zones to distribute domain controllers across different physical locations within an Azure region. When one location fails, the others keep running and users can still log in. Replication keeps the directory data consistent across all domain controllers; you configure this through Active Directory Sites and Services to define links and schedules that control how quickly changes spread. The relationship between these two concepts is important: high availability protects against hardware failures, while replication ensures that whichever domain controller handles a request has the most up-to-date information.
Securing domain controllers in Azure involves controlling who can access them and what traffic they allow. Role-based access control (RBAC) limits management permissions to specific users or groups, so only authorized administrators can change domain controller settings or deploy new VMs. Network security groups (NSGs) filter inbound and outbound traffic based on rules you define, blocking unauthorized connections while allowing legitimate authentication and replication traffic. Finally, you should set up Azure Backup to protect Active Directory data, creating policies that regularly save directory information so you can restore it if data loss occurs. These three layers work together: RBAC controls who manages the environment, NSGs control what traffic enters or leaves, and backups control whether you can recover from disasters.
Deploying AD DS in Azure follows a specific order. First, you provision the domain controller VMs by selecting the appropriate size, attaching storage, and configuring network settings. Second, you install AD DS on each VM and promote it to a domain controller using either the installation wizard or PowerShell scripts. Third, you configure replication by setting up proper replication links and schedules so all domain controllers stay synchronized. Fourth, you apply security controls by implementing RBAC, configuring NSGs, and setting up Azure Backup for recovery. This sequence matters because each step builds on the previous one: you cannot configure replication until domain controllers exist, and you cannot secure what has not been deployed.
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