Active Active Disaster Recovery Setup

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In an active-active disaster recovery (DR) setup, both primary and secondary sites are fully operational and handle production traffic simultaneously. This provides high availability and minimal downtime in case of a disaster.

For the design diagram please refer to the below link:

https://learn.microsoft.com/en-us/azure/architecture/solution-ideas/articles/disaster-recovery-enterprise-scale-dr

Key Components and Connections:

1. Primary and Secondary Regions: Both regions (e.g., East US and West US) have identical infrastructure.
2. Azure App Service: Each region has its own App Service instances running the same application.
3. Azure Functions: Similar to App Service, both regions have their own Function instances.
4. Application Gateway: Each region has its own Application Gateway that distributes traffic to the respective App Service and Function instances.
5. Azure DB: Both regions have their own Azure DB instances, with data replicated between them using Azure Database Replication.
6. Traffic Manager: A global load balancer that directs traffic to either the primary or secondary region based on health probes.
7. Network Connectivity: Both regions are connected using Azure ExpressRoute or VPN Gateway to ensure low-latency and reliable communication.

Implementation Steps:

1. Create Infrastructure: Set up App Services, Functions, Application Gateways, and Azure DB instances in both regions.
2. Configure Application Gateway: Configure the Application Gateway in each region to distribute traffic to the respective App Service and Function instances.
3. Set Up Azure Database Replication: Enable Azure Database Replication between the primary and secondary Azure DB instances.
4. Configure Traffic Manager: Create a Traffic Manager profile and configure health probes for both regions.
5. Test and Validate: Conduct thorough testing to ensure that the setup is functioning as expected.

Please refer below links for the reference:

https://learn.microsoft.com/en-us/azure/site-recovery/azure-to-azure-architecture

https://learn.microsoft.com/en-us/azure/well-architected/reliability/disaster-recovery

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