Microservices Architecture

Table of contents

1. Configuration
2. Mermaid Settings
3. Generated Diagram

---

This example models a typical microservices architecture with an API gateway routing traffic to backend services, each backed by its own database. It demonstrates basic nodes, links, and Mermaid diagram generation.

Configuration

The architecture defines five components: an API gateway, two microservices (User Service and Order Service), and their respective databases. Links represent REST APIs, gRPC calls, and database connections.

nodes:
  - id: gateway
    type: Gateway
    attributes:
      name: "API Gateway"
  - id: user_service
    type: Microservice
    attributes:
      name: "User Service"
      language: "Python"
  - id: order_service
    type: Microservice
    attributes:
      name: "Order Service"
      language: "Java"
  - id: user_db
    type: Database
    attributes:
      name: "User Database"
      database: "PostgreSQL"
  - id: order_db
    type: Database
    attributes:
      name: "Order Database"
      database: "MongoDB"

links:
  - source: gateway
    target: user_service
    type: "REST"
    attributes:
      protocol: "HTTPS"
  - source: gateway
    target: order_service
    type: "REST"
    attributes:
      protocol: "HTTPS"
  - source: user_service
    target: user_db
    type: "DB"
  - source: order_service
    target: order_db
    type: "DB"
  - source: order_service
    target: user_service
    type: "gRPC"
    attributes:
      protocol: "HTTP/2"

Mermaid Settings

A left-to-right layout with node labels derived from the name attribute.

direction: "LR"
nodeLabel: "name"

Generated Diagram

flowchart LR
    %% Nodes
    gateway[API Gateway]
    order_db[Order Database]
    order_service[Order Service]
    user_db[User Database]
    user_service[User Service]

    %% Links
    gateway -->|REST| order_service
    gateway -->|REST| user_service
    order_service -->|DB| order_db
    order_service -->|gRPC| user_service
    user_service -->|DB| user_db