Docker for Developers
Containerize your applications with Docker, from Dockerfiles to Docker Compose and production deployment.
devopsIntermediate15 min read
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Quick context for Docker for Developers
Docker for Developers is a intermediate guide in devops. Containerize your applications with Docker, from Dockerfiles to Docker Compose and production deployment.. Key topics: containers, deployment, devops, docker.
# Docker for Developers
Docker enables you to package applications with all their dependencies into standardized units for development, testing, and deployment.
## Core Concepts
### Images and Containers
An **image** is a read-only template with instructions for creating a Docker container. A **container** is a runnable instance of an image.
### Dockerfile
```dockerfile
FROM node:20-alpine
WORKDIR /app
COPY package*.json ./
RUN npm ci --only=production
COPY . .
EXPOSE 3000
CMD ["node", "server.js"]
```
## Docker Compose
For multi-service applications:
```yaml
services:
web:
build: .
ports:
- "3000:3000"
depends_on:
- db
db:
image: postgres:15
environment:
POSTGRES_DB: myapp
```
## Best Practices
1. Use multi-stage builds to reduce image size
2. Leverage build cache with proper layer ordering
3. Use `.dockerignore` to exclude unnecessary files
4. Run containers as non-root users
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