Docker Guide & Reference
This guide provides a comprehensive reference to Docker — covering core concepts, Dockerfile and Docker Compose examples, image management. Ideal for developers and DevOps engineers working on containerized applications.
1. Core Concepts
- Images: Read-only templates used to create containers.
- Containers: Running instances of Docker images.
- Volumes: Persistent data storage outside the container lifecycle.
- Networks: Enable communication between containers.
- Docker Hub: Central registry to store and share Docker images.
2. Sample Dockerfile
# Start from a lightweight base image
FROM node:18-alpine
# Set working directory
WORKDIR /app
# Copy dependencies and install
COPY package*.json ./
RUN npm install --production
# Copy source code
COPY . .
# Expose port and define start command
EXPOSE 3000
CMD ["npm", "start"]
3. Docker Compose Example
version: '3.9'
services:
web:
build: .
ports:
- "3000:3000"
volumes:
- .:/app
environment:
- NODE_ENV=production
redis:
image: redis:latest
4. Image Management
- Build image:
docker build -t my-app:latest . - List images:
docker images - Push to registry:
docker push my-app:latest - Remove image:
docker rmi my-app
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