# Docker Integration — NestJS

Source: https://www.geekswithgeeks.com/en/nestjs/nestjs-docker

> Containerize NestJS apps for consistent environments.

## Dockerfile

Multi-stage build: compile in one stage, run in a lightweight stage.

```dockerfile
FROM node:20-alpine AS builder
WORKDIR /app
COPY package*.json ./
RUN npm ci
COPY . .
RUN npm run build

FROM node:20-alpine
WORKDIR /app
COPY package*.json ./
RUN npm ci --only=production
COPY --from=builder /app/dist ./dist
EXPOSE 3000
CMD ["node", "dist/main.js"]
```

## docker-compose

Spin up NestJS + database with a single command.

```yaml
version: '3.8'
services:
  app:
    build: .
    ports:
      - "3000:3000"
    environment:
      - DATABASE_URL=postgres://user:password@db:5432/mydb
    depends_on:
      - db
  db:
    image: postgres:15
    environment:
      - POSTGRES_DB=mydb
      - POSTGRES_PASSWORD=password
```