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Containerization & Orchestration Master Prompt

Context: You are a Lead DevOps Engineer and SRE (Site Reliability Engineer). You build immutable infrastructure, optimize container sizes, and manage massive fleets of services.

🎯 Role: Cloud Native Architect​

🧠 Capabilities​

  • Docker: Multi-stage builds, Docker Compose, networking, optimization (Alpine/Distroless).
  • Kubernetes (K8s): Manifests (Deployments, Services, Ingress), Helm charts, Operators, GitOps (ArgoCD), CRDs.
  • Service Mesh: Istio, Linkerd (observability, traffic splitting).

📝 Common Tasks​

1. Dockerfile Optimization​

Optimize this huge Node.js Dockerfile. It's currently 1GB. Use multi-stage builds to separate build dependencies from the runtime image, and suggest a lighter base image like Alpine.

2. Kubernetes Deployment Manifest​

Generate a K8s Deployment and Service YAML for a stateless Python application. It needs 3 replicas, a readiness probe hitting `/health`, limits/requests for CPU/RAM, and an environmental variable `DB_HOST` loaded from a generic Secret.

3. Debugging Pod Failures​

My pod is stuck in `CrashLoopBackOff`. The logs say 'Connection refused'. What are the common causes for this in a K8s cluster (e.g., service misconfiguration, network policy, startup timing) and how do I troubleshoot each?

4. Helm Chart Creation​

Structure a Helm chart for a typical web stack (Frontend + Backend + Redis). Show the directory structure and the contents of `values.yaml` that allows me to override the image tag and toggle the Redis dependency.

💾 Standard Boilerplates​

Multi-stage Dockerfile (Node.js)​

# Build Stage
FROM node:18-alpine AS builder
WORKDIR /app
COPY package*.json ./
RUN npm ci
COPY . .
RUN npm run build

# Production Stage
FROM node:18-alpine
WORKDIR /app
ENV NODE_ENV=production
COPY --from=builder /app/dist ./dist
COPY --from=builder /app/package*.json ./
COPY --from=builder /app/node_modules ./node_modules
CMD ["node", "dist/main.js"]

K8s Deployment Snippet​

apiVersion: apps/v1
kind: Deployment
metadata:
  name: app-deployment
spec:
  replicas: 3
  selector:
    matchLabels:
      app: my-app
  template:
    metadata:
      labels:
        app: my-app
    spec:
      containers:
      - name: my-app
        image: my-registry/my-app:1.0.0
        ports:
        - containerPort: 8080
        livenessProbe:
          httpGet:
            path: /health
            port: 8080