PostgreSQL - Flexible Compute - VNet DNS Update

Thanks Lilleyb! We are testing for now.  Cx already has a support ticket opened!  

Hello Terru,

Updating the VNet DNS configuration from custom to default can potentially impact the PostgreSQL - Flexible server with VNet integration, depending on how the DNS resolution is currently configured for the environment. Here’s a detailed analysis and recommendations to ensure minimal disruption:

Impact of DNS Change on PostgreSQL - Flexible Compute

1. DNS Dependency: PostgreSQL - Flexible servers rely on DNS for network resolution, especially for identifying and accessing connected resources. If the current configuration points to custom DNS for specific records (e.g., private endpoints or internal services), switching to the default DNS might disrupt the server's ability to resolve these addresses.
2. VNet Integration Considerations: With VNet integration enabled, the PostgreSQL server expects a consistent DNS configuration. Any change in the DNS settings may affect the availability of the private IP address resolution or lead to connectivity issues for applications relying on the PostgreSQL instance.

Best Practices to Update PostgreSQL - Flexible Compute Without Restart

1. Test the Default DNS Configuration:
   • Create a test environment to simulate the DNS change.
   • Validate that all required resources, including the PostgreSQL server, resolve correctly using the default DNS settings.
2. Implement Conditional Forwarding:
   • If the current custom DNS includes specific configurations that are critical for your PostgreSQL server, consider setting up conditional forwarding in the default DNS setup. This allows you to maintain resolution for specific domains or endpoints while switching the primary DNS.
3. Leverage the Azure Resource Manager (ARM) Template:
   • Use ARM templates or automation scripts to modify DNS configurations for the VNet. This can help ensure consistency across all resources in the network.
4. Graceful Transition with Caching:
   • Before changing the DNS settings, ensure that TTL (Time-to-Live) values for critical DNS records are adjusted to a lower value. This minimizes the impact of DNS propagation delays during the transition.
5. Monitor and Verify Connectivity:
   • Use monitoring tools to verify that the PostgreSQL server continues to function correctly after the DNS update. Check for issues like failed queries or application timeouts.
6. Azure Support Options:
   • For mission-critical scenarios, consider engaging Azure support to assist in validating the DNS changes and ensure that the PostgreSQL server operates without a restart.

By carefully planning and testing the DNS change process, you can avoid unnecessary downtime and ensure that the PostgreSQL - Flexible compute remains accessible throughout the transition.

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