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Microservicessystem_design~12 mins

Health checks in containers in Microservices - Architecture Diagram

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System Overview - Health checks in containers

This system shows how health checks work in containerized microservices. Health checks help the system know if each container is working well or needs restarting. The system automatically monitors containers and keeps the services reliable and available.

Architecture Diagram
User
  |
  v
Load Balancer
  |
  v
API Gateway
  |
  v
+-------------------+      +-------------------+
| Container Service A|<---->| Health Check Agent |
+-------------------+      +-------------------+
          |                          |
          v                          v
    Database                  Monitoring System
Components
User
user
Sends requests to the system
Load Balancer
load_balancer
Distributes incoming requests to API Gateway instances
API Gateway
api_gateway
Routes requests to container services and manages traffic
Container Service A
service
Runs application logic inside a container
Health Check Agent
health_check_agent
Periodically checks container health and reports status
Database
database
Stores persistent data for the service
Monitoring System
monitoring_system
Collects health data and triggers alerts or restarts
Request Flow - 11 Hops
User → Load Balancer
Load Balancer → API Gateway
API Gateway → Container Service A
Container Service A → Database
Container Service A → API Gateway
API Gateway → Load Balancer
Load Balancer → User
Health Check Agent → Container Service A
Container Service A → Health Check Agent
Health Check Agent → Monitoring System
Monitoring System → Container Service A
Failure Scenario
Component Fails:Container Service A
Impact:Service becomes unresponsive or returns errors, user requests fail
Mitigation:Health Check Agent detects failure and reports to Monitoring System, which triggers container restart or replacement to restore service
Architecture Quiz - 3 Questions
Test your understanding
Which component is responsible for checking if a container is healthy?
AHealth Check Agent
BLoad Balancer
CAPI Gateway
DDatabase
Design Principle
This architecture uses active health checks to monitor container status continuously. The Health Check Agent probes containers regularly, and the Monitoring System acts on failures by restarting containers. This design improves reliability by detecting and recovering from failures automatically.