bunjs-production

# Bun.js Production Deployment Patterns

## Overview

This skill covers production deployment patterns for Bun.js TypeScript backend applications, including Docker containerization, AWS ECS deployment, Redis caching, security hardening, structured logging, CI/CD pipelines, and production readiness checklists.

**When to use this skill:**
- Containerizing applications with Docker
- Deploying to AWS ECS/Fargate
- Implementing Redis caching strategies
- Hardening security (headers, CORS, rate limiting)
- Setting up CI/CD pipelines
- Preparing for production deployment

**See also:**
- **dev:bunjs** - Core Bun patterns, HTTP servers, database access
- **dev:bunjs-architecture** - Layered architecture, camelCase conventions
- **dev:bunjs-apidog** - OpenAPI specifications and Apidog integration

## Docker Multi-Stage Build

### Production Dockerfile

```dockerfile
# Stage 1: Base
FROM oven/bun:1-alpine AS base
WORKDIR /app

# Stage 2: Dependencies
FROM base AS deps
COPY package.json bun.lockb ./
COPY prisma ./prisma/
RUN bun install --frozen-lockfile --production

# Stage 3: Build
FROM base AS build
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN bunx prisma generate
RUN bun run build  # Optional: if you have a build step

# Stage 4: Runner
FROM base AS runner
WORKDIR /app
ENV NODE_ENV=production

# Create non-root user
RUN addgroup -g 1001 bungroup && \
    adduser -D -u 1001 -G bungroup bunuser

# Copy dependencies and source
COPY --from=deps /app/node_modules ./node_modules
COPY --from=build /app/src ./src
COPY --from=build /app/prisma ./prisma
COPY --from=build /app/node_modules/.prisma ./node_modules/.prisma
COPY package.json bun.lockb ./

# Set ownership
RUN chown -R bunuser:bungroup /app

USER bunuser
EXPOSE 3000

# Health check
HEALTHCHECK --interval=30s --timeout=5s --start-period=30s --retries=3 \
  CMD wget --no-verbose --tries=1 --spider http://localhost:3000/health || exit 1

CMD ["bun", "src/server.ts"]
```

### docker-compose.yml (Local Development)

```yaml
version: '3.8'

services:
  app:
    build:
      context: .
      dockerfile: Dockerfile
    ports:
      - "3000:3000"
    environment:
      - NODE_ENV=development
      - DATABASE_URL=postgresql://user:password@postgres:5432/mydb
      - REDIS_URL=redis://redis:6379
    depends_on:
      - postgres
      - redis
    volumes:
      - ./src:/app/src
    command: bun --hot src/server.ts

  postgres:
    image: postgres:17-alpine
    environment:
      POSTGRES_USER: user
      POSTGRES_PASSWORD: password
      POSTGRES_DB: mydb
    ports:
      - "5432:5432"
    volumes:
      - postgres-data:/var/lib/postgresql/data

  redis:
    image: redis:7-alpine
    ports:
      - "6379:6379"
    volumes:
      - redis-data:/data

volumes:
  postgres-data:
  redis-data:
```

### Build and Run Commands

```bash
# Build image
docker build -t myapp:latest .

# Run locally
docker-compose up -d

# Run migrations
docker-compose exec app bunx prisma migrate deploy

# View logs
docker-compose logs -f app

# Stop
docker-compose down
```

## Graceful Shutdown

### Server with Shutdown Handling

```typescript
// src/server.ts
import { serve } from '@hono/node-server';
import { app } from './app';
import { prisma } from '@/database/client';
import { logger } from '@core/logger';

const PORT = Number(process.env.PORT) || 3000;

// Start server
const server = serve({
  fetch: app.fetch,
  port: PORT
});

logger.info(`🚀 Server running on port ${PORT}`);

// Graceful shutdown handler
async function shutdown(signal: string) {
  logger.info(`Received ${signal}, initiating graceful shutdown...`);

  try {
    // Close HTTP server (stop accepting new requests)
    server.close();
    logger.info('HTTP server closed');

    // Close database connections
    await prisma.$disconnect();
    logger.info('Database connections closed');

    // Close Redis connections (if used)
    // await redis.quit();

    logger.info('Graceful shutdown complete');
    process.exit(0);
  } catch (error) {
    logger.error({ error }, 'Error during shutdown');
    process.exit(1);
  }
}

// Handle termination signals
process.on('SIGTERM', () => shutdown('SIGTERM'));
process.on('SIGINT', () => shutdown('SIGINT'));

// Handle unhandled errors
process.on('unhandledRejection', (reason, promise) => {
  logger.error({ reason, promise }, 'Unhandled promise rejection');
});

process.on('uncaughtException', (error) => {
  logger.error({ error }, 'Uncaught exception');
  shutdown('UNCAUGHT_EXCEPTION');
});
```

## AWS ECS Deployment

### Task Definition (JSON)

```json
{
  "family": "myapp",
  "networkMode": "awsvpc",
  "requiresCompatibilities": ["FARGATE"],
  "cpu": "256",
  "memory": "512",
  "containerDefinitions": [
    {
      "name": "myapp",
      "image": "123456789012.dkr.ecr.us-east-1.amazonaws.com/myapp:latest",
      "essential": true,
      "portMappings": [
        {
          "containerPort": 3000,
          "protocol": "tcp"
        }
      ],
      "environment": [
        {
          "name": "NODE_ENV",
          "value": "production"
        },
        {
          "name": "PORT",
          "value": "3000"
        }
      ],
      "secrets": [
        {
          "name": "DATABASE_URL",
          "valueFrom": "arn:aws:secretsmanager:us-east-1:123456789012:secret:myapp/DATABASE_URL"
        },
        {
          "name": "JWT_SECRET",
          "valueFrom": "arn:aws:secretsmanager:us-east-1:123456789012:secret:myapp/JWT_SECRET"
        }
      ],
      "logConfiguration": {
        "logDriver": "awslogs",
        "options": {
          "awslogs-group": "/ecs/myapp",
          "awslogs-region": "us-east-1",
          "awslogs-stream-prefix": "ecs"
        }
      },
      "healthCheck": {
        "command": ["CMD-SHELL", "wget --no-verbose --tries=1 --spider http://localhost:3000/health || exit 1"],
        "interval": 30,
        "timeout": 5,
        "retries": 3,
        "startPeriod": 30
      }
    }
  ]
}
```

### Service Definition (JSON)

```j