What is the recommended network architecture for a two-tier web application in OCI?

The recommended network architecture for a two-tier web application in Oracle Cloud Infrastructure (OCI) involves creating public subnets for web servers and private subnets for database servers. This design is based on security and functional best practices.

In this architecture, the web servers are hosted in public subnets to allow them to be accessed from the internet. This is necessary as these servers need to respond to user requests, handling activities such as serving web pages, processing user input, and interacting with clients. By placing these servers in a public subnet, they can communicate externally while still being part of the larger network setup.

On the other hand, database servers, which are critical for maintaining data integrity and security, are placed in private subnets. This configuration prevents direct access from the internet to the database servers, ensuring that critical data remains secure. Only the web servers, which are exposed to the internet, can communicate with the database servers. This two-tier approach effectively creates a buffer, enhancing security by reducing the attack surface for sensitive database resources.

This separation also enables additional layers of security, such as using network security groups, and allows more controlled access to each part of the system. Therefore, utilizing a model where web servers are in public subnets and database servers are