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Microservicessystem_design~12 mins

Why security spans all services in Microservices - Architecture Impact

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System Overview - Why security spans all services

This system shows a microservices architecture where security is applied across all services. Each service handles a specific business function, but security measures like authentication, authorization, and encryption are enforced everywhere to protect data and prevent unauthorized access.

Key requirements include secure communication between services, user identity verification, and data protection at every step.

Architecture Diagram
User
  |
  v
Load Balancer
  |
  v
API Gateway
  |
  +-------------------+-------------------+-------------------+-------------------+
  |                   |                   |                   |                   |
Service A          Service B           Service C           Service D
  |                   |                   |                   |
  v                   v                   v                   v
Database A          Database B          Database C          Database D
  |
  v
Cache Layer
Components
User
user
End user who sends requests to the system
Load Balancer
load_balancer
Distributes incoming requests evenly across API Gateway instances
API Gateway
api_gateway
Central entry point that handles authentication, routing, and security checks
Service A
service
Handles a specific business function with its own security checks
Service B
service
Handles another business function with embedded security
Service C
service
Handles a different business domain, enforcing security policies
Service D
service
Additional business service with security controls
Database A
database
Stores data for Service A with encryption and access controls
Database B
database
Stores data for Service B securely
Database C
database
Stores data for Service C with strict access policies
Database D
database
Stores data for Service D securely
Cache Layer
cache
Speeds up data access with secure caching mechanisms
Request Flow - 11 Hops
User → Load Balancer
Load Balancer → API Gateway
API Gateway → API Gateway
API Gateway → Service A
Service A → Cache Layer
Cache Layer → Service A
Service A → Database A
Database A → Service A
Service A → API Gateway
API Gateway → Load Balancer
Load Balancer → User
Failure Scenario
Component Fails:API Gateway
Impact:All incoming requests fail authentication and routing, blocking user access to services
Mitigation:Deploy multiple API Gateway instances with health checks and failover to ensure availability
Architecture Quiz - 3 Questions
Test your understanding
Why does the API Gateway perform authentication before routing requests?
ATo speed up database queries
BTo verify user identity and prevent unauthorized access early
CTo balance load between services
DTo cache user data
Design Principle
Security must be applied at every layer in a microservices system to protect data and control access. The API Gateway acts as the first gatekeeper, but each service also enforces its own security to handle internal communication and prevent breaches if one component is compromised.