This image is an architecture diagram of the deployment of an Oracle E-Business Suite application in a single availability domain while ensuring high availability.

The architecture consists of a virtual cloud network (VCN) with the bastion, load balancer, application, and database hosts placed in separate subnets of VCN in a single availability domain. The bastion, load balancer, and applications are deployed in Compartment A and the database hosts are deployed in Compartment B. The load balancers and the bastion servers are deployed in public subnets, and all the other instances are deployed in private subnets. The load balancer subnet has a standby load balancer instance as well. Two application instances are deployed in the availability domain. Both application instances in the availability domain are active.

The bastion host receives requests through the dynamic routing gateway (DRG) and internet gateway. The DRG is the gateway that connects your on-premises network to your cloud network. To enable communication between the DRG and the customer-premises equipment, use IPSec VPN or Oracle Cloud Infrastructure FastConnect. To access your bastion host from the internet, set up an internet gateway.