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Microservicessystem_design~12 mins

Services and networking in Microservices - Architecture Diagram

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System Overview - Services and networking

This system demonstrates how multiple microservices communicate over a network to fulfill user requests. It highlights key networking components like load balancers, API gateways, and service-to-service communication to ensure scalability and reliability.

Architecture Diagram
User
  |
  v
Load Balancer
  |
  v
API Gateway
  |
  +-------------------+-------------------+
  |                   |                   |
Service A          Service B           Service C
  |                   |                   |
  v                   v                   v
Database A          Database B          Database C
  |
  v
Cache
Components
User
client
Initiates requests to the system
Load Balancer
load_balancer
Distributes incoming requests evenly across API Gateway instances
API Gateway
api_gateway
Routes requests to appropriate microservices and handles authentication
Service A
service
Handles specific business logic A
Service B
service
Handles specific business logic B
Service C
service
Handles specific business logic C
Database A
database
Stores data for Service A
Database B
database
Stores data for Service B
Database C
database
Stores data for Service C
Cache
cache
Speeds up data retrieval for frequently accessed data
Request Flow - 11 Hops
User → Load Balancer
Load Balancer → API Gateway
API Gateway → Service A
Service A → Cache
Cache → Service A
Service A → Database A
Database A → Service A
Service A → Cache
Service A → API Gateway
API Gateway → Load Balancer
Load Balancer → User
Failure Scenario
Component Fails:Database A
Impact:Service A cannot retrieve fresh data; cache may serve stale data; writes fail
Mitigation:Use database replication for failover; rely on cache for reads; queue writes for retry
Architecture Quiz - 3 Questions
Test your understanding
Which component distributes incoming user requests to prevent overload?
AAPI Gateway
BLoad Balancer
CCache
DService A
Design Principle
This architecture shows how microservices communicate through a network using load balancers and API gateways to manage traffic and routing. Caches reduce database load and improve response times. The design supports scalability and fault tolerance by separating concerns and using specialized components.