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Advanced 22 min readModule: Module 7: Kubernetes Deployments, Services & Ingress

Deployments, Services & Ingress Controllers

Orchestrate zero-downtime rolling updates with Deployments and expose services to internet traffic via Ingress.

What You Will Learn in This Lesson

  • Deployments for managing replica sets and rolling zero-downtime updates
  • Kubernetes Services (ClusterIP, NodePort, LoadBalancer) for stable internal DNS
  • Ingress Controllers (NGINX/Traefik) for SSL termination and HTTP path routing

Introduction & Core Concept

Deployments maintain a specified number of Pod replicas, automatically replacing failed instances. Services provide stable virtual IPs and load balancing across dynamic pods.
WHY DOES THIS MATTER IN THE REAL WORLD?

During a new version release, Kubernetes Deployments spin up new pods and health-check them before terminating old pods, achieving 0 downtime.

Kubernetes Deployment & Service Manifest

yaml
yaml
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apiVersion: apps/v1
kind: Deployment
metadata:
  name: kwas-web-deployment
spec:
  replicas: 3
  selector:
    matchLabels:
      app: kwas-web
  template:
    metadata:
      labels:
        app: kwas-web
    spec:
      containers:
        - name: web
          image: kwasacademy/web:2.0.0
          ports:
            - containerPort: 3000
---
apiVersion: v1
kind: Service
metadata:
  name: kwas-web-service
spec:
  type: ClusterIP
  selector:
    app: kwas-web
  ports:
    - port: 80
      targetPort: 3000

Line-by-Line Technical Breakdown

1Readiness and Liveness probes prevent traffic from being sent to starting or unhealthy containers.

Try It Yourself (Interactive Editor)

Modify the code in real-time and click Run to test live browser output and console logs.

Intelligent Code Runner & Live Sandbox[YAML]
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Industry Best Practices & Professional Standards

  • Always configure livenessProbe and readinessProbe on container specs.

Lesson Summary & Core Takeaways

  • Deployments and Services provide self-healing, zero-downtime container management.