Design and Build Highly Available Multi Region Web Application

This reference architecture shows how to run an Azure App Service application in multiple regions to achieve high availability.

There are several general approaches to achieve high availability across regions:

Active/Passive with hot standby: traffic goes to one region, while the other waits on hot standby. Hot standby means the VMs in the secondary region are allocated and running at all times.

Active/Passive with cold standby: traffic goes to one region, while the other waits on cold standby. Cold standby means the VMs in the secondary region are not allocated until needed for failover. This approach costs less to run, but will generally take longer to come online during a failure.

Active/Active: both regions are active, and requests are load balanced between them. If one region becomes unavailable, it is taken out of rotation.

This reference focuses on active/passive with hot standby. It extends the single region design for a scalable web application.

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