Spring Boot Tutorial 0/110 lessons ~6 min read Lesson 75“Production-grade backends”

Kubernetes Basics

Kubernetes orchestrates containers across machines: scheduling, scaling, healing, networking, config.

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Focus

2 guided sections

Practice signal

Examples included

Career prep

Foundation builder

Introduction

Kubernetes orchestrates containers across machines: scheduling, scaling, healing, networking, config. The minimum knowledge for a backend engineer: Deployment, Service, ConfigMap, Secret, Ingress.

Informative example

bash

apiVersion: apps/v1
kind: Deployment
metadata: { name: orders }
spec:
  replicas: 3
  selector: { matchLabels: { app: orders } }
  template:
    metadata: { labels: { app: orders } }
    spec:
      containers:
        - name: app
          image: acme/orders:1.0.0
          ports: [{ containerPort: 8080 }]
          env:
            - name: SPRING_PROFILES_ACTIVE
              value: prod
            - name: DB_PASSWORD
              valueFrom: { secretKeyRef: { name: orders-secrets, key: db-password } }
          readinessProbe:
            httpGet: { path: /actuator/health/readiness, port: 8080 }
          livenessProbe:
            httpGet: { path: /actuator/health/liveness, port: 8080 }
---
apiVersion: v1
kind: Service
metadata: { name: orders }
spec:
  selector: { app: orders }
  ports: [{ port: 80, targetPort: 8080 }]

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