Azure DNS

Overview

Azure DNS hosts your DNS domains in Azure, providing name resolution using Microsoft’s global infrastructure.

Real-life Use Cases

• Cloud Architect: Design global DNS for multi-region apps.

• DevOps Engineer: Automate DNS record management for blue/green deployments.

Terraform Example

resource "azurerm_dns_zone" "main" {
  name                = "example.com"
  resource_group_name = azurerm_resource_group.main.name
}

resource "azurerm_dns_a_record" "www" {
  name                = "www"
  zone_name           = azurerm_dns_zone.main.name
  resource_group_name = azurerm_resource_group.main.name
  ttl                 = 300
  records             = ["1.2.3.4"]
}

Bicep Example

resource dnsZone 'Microsoft.Network/dnsZones@2020-06-01' = {
  name: 'example.com'
  location: 'global'
}

resource aRecord 'Microsoft.Network/dnsZones/A@2020-06-01' = {
  name: 'www'
  parent: dnsZone
  properties: {
    TTL: 300
    ARecords: [
      {
        ipv4Address: '1.2.3.4'
      }
    ]
  }
}

Azure CLI Example

az network dns zone create --resource-group my-rg --name example.com
az network dns record-set a add-record --resource-group my-rg --zone-name example.com --record-set-name www --ipv4-address 1.2.3.4

Best Practices

• Use CNAMEs for app endpoints.

• Automate DNS changes in CI/CD.

Common Pitfalls

• Not updating TTLs during migrations.

• Misconfigured record sets.

Joke: Why did Azure DNS get promoted? It always knew how to resolve issues!