5.1.1.4. Configure Azure DNS
š” First Principle: Azure DNS provides a reliable, scalable, and high-performance hosting service for DNS domains, ensuring that domain names are accurately and efficiently resolved to their corresponding IP addresses and services.
Scenario: You need to host the public DNS records for your company's website (www.example.com) in Azure. Additionally, your internal applications need to resolve internal hostnames (e.g., database.internal.local) within your Azure Virtual Network without exposing them to the internet.
What It Is: Azure DNS is a hosting service for DNS domains.
Key Concepts:
- DNS Zones: Logical containers for DNS records of a domain.
- Record Sets: Groups of DNS records of the same type (A, CNAME, MX, TXT).
- Public DNS Zones: Used for domains that must be resolvable over the public internet.
- Private DNS Zones: Used for internal name resolution within Azure virtual networks.
Configuration Steps:
- Create a DNS Zone:
- Choose public or private, specify the domain name, and assign a resource group.
- Add Record Sets:
- Within the DNS zone, add record sets (A, CNAME, MX, TXT, etc.).
- For private zones, link the zone to one or more virtual networks.
Visual: Public vs. Private DNS Zones
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ā ļø Common Pitfall: Forgetting to delegate your domain from your domain registrar to the Azure DNS name servers. Until you update the NS records at your registrar, Azure DNS will not be authoritative for your domain.
Key Trade-Offs:
- Azure DNS vs. Third-Party DNS: Azure DNS offers seamless integration with other Azure services and high reliability. Third-party DNS providers may offer different features or pricing models that could be a better fit for specific, non-Azure-centric use cases.
Reflection Question: How does configuring Azure DNS (using public and private DNS zones) fundamentally ensure reliable, scalable, and high-performance name resolution for both public-facing domains and internal Azure resources?