This image shows the data flow in a multi-tier topology consisting of a load balancer, a containerized application, and an autonomous database in an Oracle Cloud Infrastructure region.

Traffic from the public internet is routed by the DNS service through a web application firewall (WAF) to the load balancer.

The load balancer forwards incoming requests to an Ingress (Nginx) service in a Kubernetes cluster.

The Ingress service sends traffic to a Router (Traefik) microservice.

Depending on the type of the request, the Router service forwards the requests to one of the following services:

• Media (Node.js)

  The Media service interacts with Oracle Cloud Infrastructure Object Storage.

• Storefront (HTML 5)
• REST API (Node.js)

The REST API service interacts with the following services:

• Oracle Cloud Infrastructure Functions and Email Delivery services, through the API Gateway service.
• Session DB (Redis)
• Oracle Cloud Infrastructure Streaming, through the Tracking (Go) service.
• Users (TypeScript)
• Orders (Java)

The Orders service interacts with the following services:

• Fulfillment (Micronaut), through Messaging (NATS)
• Payments (Go)
• Carts (Helidon)
• Catalog (Go)

The Orders, Users, Carts, and Catalog services interact with an autonomous database.