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Host your domain on Azure DNS | AZ-104 | Episode 10

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DNS fundamentals

  1. DNS maps memorable names to IP addresses, allowing services to keep the same name even when the underlying IP address changes.
  2. DNS supports forward lookup from name to IP address and reverse lookup from IP address to name for validation scenarios.

Azure DNS overview

  1. Azure DNS provides a managed platform service that can replace self-managed DNS servers, reducing the need to maintain, patch, and scale DNS infrastructure.
  2. Azure can host both public and private DNS resolution, including scenarios where organizations separate external and internal namespaces.
  3. When a public DNS zone is registered in Azure DNS, Azure creates four name servers that can be configured at the domain registrar.

Public DNS zones

  1. Public DNS zones contain records such as A, CNAME, TXT, MX, and AAAA records for routing names like www or mail to the correct resources.
  2. Azure DNS supports importing an existing zone file from another DNS server, which is useful when migrating many existing records.
  3. After a DNS zone is created, users manage record sets and use the Azure-provided name servers as the authoritative servers for the domain.

Domain validation for Microsoft Entra ID

  1. A custom domain can be added to Microsoft Entra ID by proving ownership through a DNS TXT or MX record placed in the authoritative DNS zone.
  2. Once validated, the custom domain can be used for tenant identity information and user principal names instead of the default onmicrosoft.com domain.

Private DNS in Azure

  1. Azure private DNS supports internal name resolution for resources inside virtual networks and can help simplify split-brain DNS scenarios.
  2. Private DNS resolvers can be associated with virtual networks, replacing default DNS behavior and enabling consistent resolution across enterprise, dev, test, or production VNets.
  3. Private DNS can use inbound and outbound endpoints to connect resolution flows to required services.

Key takeaway

  1. Azure DNS provides reliable public and private name resolution at Azure scale, supporting both internet-facing domains and internal virtual network resources.

Actiepunten

  1. Register the public domain name with a domain registrar before hosting it in Azure DNS.
  2. Configure the registrar to use the four Azure DNS name servers created for the DNS zone.
  3. Add a TXT or MX validation record to the authoritative DNS zone when proving ownership of a custom domain for Microsoft Entra ID.
  4. Watch other course videos or explore Microsoft Learn for continued learning.