About This Architecture

Multi-availability domain web architecture on OCI us-ashburn-1 region spanning three tiers: presentation, application, and data layers across isolated subnets. Internet users route through an Internet Gateway to a Public Load Balancer distributing traffic to Web Servers (VM.Standard3.Flex) in AD-1 and AD-2 private subnets, which connect to an Autonomous Database ATP instance in AD-1. A Bastion Host provides secure administrative access to web servers, while a NAT Gateway enables outbound internet connectivity from private subnets. The DRG (Dynamic Routing Gateway) bridges the architecture to an on-premises data center, enabling hybrid cloud operations. This design demonstrates OCI best practices for high availability, security segmentation, and disaster recovery across multiple availability domains. Fork and customize this diagram on Diagrams.so to match your region, subnet sizing, or add additional application tiers. Consider adding a standby Autonomous Database in AD-2 for active-active data layer redundancy.

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How do I design a highly available web application on OCI across multiple availability domains with on-premises connectivity?

This diagram shows a three-tier OCI architecture spanning AD-1 and AD-2 with a Public Load Balancer distributing traffic to Web Servers, an Autonomous Database in AD-1, and a DRG connecting to your on-premises data center. The Bastion Host provides secure admin access while NAT Gateway enables outbound connectivity from private subnets.