Microservicessystem_design~12 mins

Why Kubernetes manages microservice deployment in Microservices - Architecture Impact

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System Overview - Why Kubernetes manages microservice deployment

This system explains why Kubernetes is used to manage microservice deployments. Kubernetes helps automate deployment, scaling, and management of microservices, ensuring they run reliably and efficiently across many servers.

Architecture Diagram

User
  |
  v
Load Balancer
  |
  v
Kubernetes API Server
  |
  v
Scheduler -> Controller Manager
  |
  v
Worker Nodes (Pods running microservices)
  |
  v
Container Runtime -> Microservice Containers
  |
  v
Persistent Storage / Config Maps / Secrets

Components

User

client

Sends requests to microservices

Load Balancer

load_balancer

Distributes incoming requests to Kubernetes API Server or services

Kubernetes API Server

api_gateway

Receives deployment commands and manages cluster state

Scheduler

scheduler

Assigns microservice pods to worker nodes based on resource availability

Controller Manager

controller

Ensures desired state of microservices is maintained (e.g., number of replicas)

Worker Nodes

compute_node

Run microservice containers inside pods

Container Runtime

runtime

Runs and manages container lifecycle on worker nodes

Persistent Storage / Config Maps / Secrets

storage

Stores data, configuration, and sensitive information for microservices

Request Flow - 7 Hops

User → Load Balancer

Load Balancer → Worker Nodes

User → Kubernetes API Server

Kubernetes API Server → Scheduler

Scheduler → Worker Nodes

Controller Manager → Worker Nodes

Worker Nodes → Container Runtime

Failure Scenario

Component Fails:Worker Nodes

Impact:Microservice pods on failed nodes become unavailable, causing service disruption

Mitigation:Kubernetes reschedules pods to healthy nodes automatically to restore service

Architecture Quiz - 3 Questions

Test your understanding

Which component assigns microservice pods to worker nodes?

AScheduler

BLoad Balancer

CController Manager

DAPI Server

Design Principle

Kubernetes manages microservice deployment by automating pod scheduling, scaling, and health monitoring. This ensures microservices run reliably across many nodes, improving availability and simplifying operations.