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.