What are thes best practices and recommendations for setting up Azure Virtual Network in High availabilty mode?

Question

Hello Team,

I am setting up VNET for production environment, so willing to set up in High availability mode to avoid single point of failure in case of Disaster happens, but unable to find any Microsoft documentation related to that.

Thus, would like to request you to please share best practices and recommendations for setting up Azure Virtual Network in High availability mode.

Regards,
Gaurav Pandey.

Answer 1

Hello @Gaurav Pandey

Azure VNet is created within the scope of a region. The virtual network and the resources in the affected region remains inaccessible during the time of the region disruption or outage.
Azure VNet is simply is a logical representation of your network in the cloud. It allows you to define your own private IP address space and segment the network into subnets. VNets serves as a trust boundary to host your compute resources such as Azure Virtual Machines and Cloud Services (web/worker roles).

You should consider not the High availability of VNet itself but High availability of the resources that are hosted inside VNet. Azure Site Recovery could help you with this.
Azure Site Recovery enables disaster recovery for Azure VMs by replicating VMs to another Azure region, failing over if an outage occurs, and failing back to the primary region when things are back to normal.
During failover, you might want to keep the IP addressing in the target region identical to the source region:

Example of VM High Availability and Disaster recovery architecture

Example of App Service High Availability and Disaster recovery architecture

https://learn.microsoft.com/en-us/azure/site-recovery/site-recovery-retain-ip-azure-vm-failover
https://learn.microsoft.com/en-us/azure/virtual-network/virtual-network-disaster-recovery-guidance
https://learn.microsoft.com/en-us/azure/architecture/reference-architectures/app-service-web-app/multi-region