kubernetes

Kubernetes Cloud-Native Standards

Quick Navigation: Level 1: Quick Start (5 min) | Level 2: Implementation (30 min) | Level 3: REFERENCE.md (Extended)

Level 1: Quick Start

Core Principles

1. Declarative Configuration: Define desired state, let Kubernetes manage it
2. Resource Limits: Always set requests and limits for CPU and memory
3. Health Checks: Implement liveness, readiness, and startup probes
4. Security First: RBAC, network policies, pod security standards
5. Immutable Infrastructure: Never modify running containers

Essential Checklist

• Use Deployments (not bare Pods) for applications
• Set CPU/memory requests and limits
• Configure liveness and readiness probes
• Use ConfigMaps for config, Secrets for sensitive data
• Define Services for pod-to-pod communication
• Enable RBAC, use NetworkPolicies, set PodSecurityContext
• Expose metrics endpoint for Prometheus
• Run multiple replicas (min 3 for production)

Minimal Deployment Example

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp
  namespace: production
spec:
  replicas: 3
  selector:
    matchLabels:
      app: myapp
  template:
    metadata:
      labels:
        app: myapp
    spec:
      securityContext:
        runAsNonRoot: true
        runAsUser: 1000
      containers:
      - name: myapp
        image: registry.example.com/myapp:v1.0.0
        ports:
        - containerPort: 8080
        resources:
          requests:
            memory: "256Mi"
            cpu: "250m"
          limits:
            memory: "512Mi"
            cpu: "500m"
        livenessProbe:
          httpGet:
            path: /health
            port: 8080
          initialDelaySeconds: 30
          periodSeconds: 10
        readinessProbe:
          httpGet:
            path: /ready
            port: 8080
          initialDelaySeconds: 5
          periodSeconds: 5
---
apiVersion: v1
kind: Service
metadata:
  name: myapp
  namespace: production
spec:
  type: ClusterIP
  selector:
    app: myapp
  ports:
  - port: 80
    targetPort: 8080