DevOps — Infrastructure & Deployment

Deployment Checklist

1. All tests pass in CI (not just locally)
2. Environment variables set in target environment
3. Database migrations tested against production-like data
4. Rollback plan documented (even if it's "revert this commit")
5. Health check endpoint exists and returns 200

CI/CD Pipeline

push → lint → typecheck → test → build → deploy staging → smoke test → deploy prod

Docker

# Multi-stage build — keep images small
FROM node:22-alpine AS builder
WORKDIR /app
COPY package*.json ./
RUN npm ci --production=false
COPY . .
RUN npm run build

FROM node:22-alpine
WORKDIR /app
COPY --from=builder /app/dist ./dist
COPY --from=builder /app/node_modules ./node_modules
EXPOSE 3000
CMD ["node", "dist/server.js"]

• Always pin base image versions (not

  latest

  )
• Use

  .dockerignore

  — never ship

  node_modules

  ,

  .git

  ,

  .env

• One process per container
• Health check in Dockerfile:

  HEALTHCHECK CMD curl -f http://localhost:3000/health

Monitoring

• Every alert must have a runbook (even a one-liner)
• If an alert fires and needs no action, delete it — alert fatigue kills
• Log structured JSON, not printf strings
• Include request ID in every log line for tracing

Infrastructure Defaults

Incident Response

1. Detect — alert fires or user report
2. Acknowledge — someone owns it (within 5 min)
3. Mitigate — rollback, feature flag off, or scale up (fix the bleeding)
4. Investigate — root cause after bleeding stops
5. Fix — proper fix with tests
6. Postmortem — blameless, focus on systems not people