Failover -- Azure Front Door

To set up failover in the scenario where you are using Azure Front Door or Azure Traffic Manager, you would typically follow these steps:

1. Configure Health Probes:

   • Set up health probes or monitoring endpoints for each of your backend services (e.g., web applications, APIs) in both the primary and secondary regions. These probes will regularly check the health and availability of your backend services.

2. Define Failover Policies:

   • Define failover policies based on the health status of your backend services. For example, if a backend service in the primary region becomes unhealthy or unavailable, you want traffic to automatically failover to the corresponding service in the secondary region.

3. Configure Traffic Routing:

   • In Azure Front Door or Azure Traffic Manager, configure traffic routing rules to direct incoming requests to the appropriate backend services based on your failover policies.
   • For Azure Front Door, you can define routing rules using routing rules engine to specify conditions and actions for routing traffic.
   • For Azure Traffic Manager, you can use traffic-routing methods such as priority, weighted, performance, or geographic routing to determine how traffic is distributed among your endpoints.

4. Monitor Failover Events:

   • Set up monitoring and alerting to track the health and performance of your backend services and the status of failover events.
   • Configure alerts to notify you when failover occurs or when there are issues with the health of your services in either region.

5. Testing and Validation:

   • Conduct testing and validation of your failover setup to ensure that traffic fails over correctly in various scenarios, including planned failovers, unplanned failovers, and recovery procedures.
   • Test the failover process regularly to verify that it works as expected and that there are no unexpected issues or disruptions.

6. Documentation and Communication:

   • Document your failover procedures, including step-by-step instructions for initiating failover events and troubleshooting common issues.
   • Communicate the failover procedures and responsibilities to relevant stakeholders, including operations teams, support teams, and management, to ensure everyone is prepared to respond effectively in the event of a failover.

By following these steps, you can set up failover in your scenario using Azure Front Door or Azure Traffic Manager to ensure continuous availability and resilience of your applications and services across multiple regions.

1. Azure Key Vault Access (Optional):

   • Access policies in Azure Key Vault: If you're storing sensitive information such as secrets or certificates in Azure Key Vault, grant the service principal the necessary permissions to access these secrets.
   • Required permissions may include Get and List permissions on key vault secrets.

2. Networking Access (Optional):

   • Network Contributor role assignment: If you need to manage networking resources such as virtual networks, subnets, or network security groups, grant the service principal the Network Contributor role.