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Microservicessystem_design~12 mins

Pods and deployments for services in Microservices - Architecture Diagram

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System Overview - Pods and deployments for services

This system manages microservices using Pods and Deployments in a container orchestration platform like Kubernetes. It ensures services run reliably, can scale automatically, and recover from failures without downtime.

Architecture Diagram
User
  |
  v
Ingress Controller
  |
  v
Load Balancer
  |
  v
+-------------------+       +-------------------+
| Deployment A       |       | Deployment B       |
| +---------------+ |       | +---------------+ |
| | Pod A1        | |       | | Pod B1        | |
| +---------------+ |       | +---------------+ |
| +---------------+ |       | +---------------+ |
| | Pod A2        | |       | | Pod B2        | |
| +---------------+ |       | +---------------+ |
+-------------------+       +-------------------+
         |                           |
         v                           v
   Service A                    Service B
         |                           |
         v                           v
     Database                    Cache Layer
Components
User
client
Sends requests to the services
Ingress Controller
ingress
Manages external access to services inside the cluster
Load Balancer
load_balancer
Distributes incoming traffic evenly across Pods
Deployment A
deployment
Manages lifecycle and scaling of Pods for Service A
Deployment B
deployment
Manages lifecycle and scaling of Pods for Service B
Pod A1
pod
Runs an instance of Service A
Pod A2
pod
Runs another instance of Service A for redundancy and scaling
Pod B1
pod
Runs an instance of Service B
Pod B2
pod
Runs another instance of Service B for redundancy and scaling
Service A
service
Provides stable network endpoint for Pods of Service A
Service B
service
Provides stable network endpoint for Pods of Service B
Database
database
Stores persistent data for services
Cache Layer
cache
Speeds up data access for services
Request Flow - 11 Hops
UserIngress Controller
Ingress ControllerLoad Balancer
Load BalancerPod (e.g., Pod A1)
Pod (e.g., Pod A1)Cache Layer
Cache LayerPod (e.g., Pod A1)
Pod (e.g., Pod A1)Database
DatabasePod (e.g., Pod A1)
Pod (e.g., Pod A1)Cache Layer
Pod (e.g., Pod A1)Load Balancer
Load BalancerIngress Controller
Ingress ControllerUser
Failure Scenario
Component Fails:Pod (e.g., Pod A1)
Impact:Requests routed to the failing Pod fail or timeout, causing degraded service availability
Mitigation:Deployment controller detects Pod failure and automatically creates a new Pod instance; Load Balancer stops sending traffic to the failed Pod
Architecture Quiz - 3 Questions
Test your understanding
What component ensures that multiple Pod instances of a service run and recover automatically?
ADeployment
BLoad Balancer
CIngress Controller
DCache Layer
Design Principle
This architecture uses Deployments to manage Pods, ensuring automatic scaling and self-healing. Services provide stable network endpoints, while Load Balancers distribute traffic evenly. The system separates concerns for reliability and scalability.