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Azure Private DNS zone resiliency
DNS private zones are resilient to regional outages because zone data is globally available. Resource records in a private zone are automatically replicated across regions.
Resiliency example
The following figure illustrates the availability of private zone data across multiple regions.
👁 Regional failure example showing three VNets with one red and two green
In this example:
- The private zone azure.contoso.com is linked to VNets in three different regions. Autoregistration is enabled in two regions.
- A temporary outage occurs in region A.
- Regions B and C are still able to successfully query DNS names in the private zone, including names that are autoregistered from region A (ex: VM1).
- Service interruption in region A doesn't affect name resolution in the other regions.
The example shown here doesn't illustrate a disaster recovery scenario, however the global nature of private zones also makes it possible to recreate VM1 in another VNet and assume its workload.
Note
Azure Private DNS is a zone-redundant service. For more information, see Azure services with availability zone support.
Next steps
- To learn more about Private DNS zones, see Using Azure DNS for private domains.
- Learn how to create a Private DNS zone in Azure DNS.
- Learn about DNS zones and records by visiting: DNS zones and records overview.
- Learn about some of the other key networking capabilities of Azure.
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