Docker Basics
This guide provides an introduction to Docker, containerization, and essential concepts for building and managing containers.
What is Docker?
- Definition: A platform for developing, shipping, and running applications in containers
- Containers: Lightweight, standalone packages containing everything needed to run an application
- Benefits: Consistency, portability, and efficiency
Core Concepts
Container Basics
- Images: Read-only templates for creating containers
- Containers: Running instances of Docker images
- Registry: Repository for storing and sharing images
- Dockerfile: Instructions for building Docker images
Docker Architecture
- Docker Engine: Core container runtime
- Docker Daemon: Background service managing containers
- Docker Client: Command-line interface
- Docker Hub: Public image registry
Working with Docker
Basic Commands
- Building Images:
docker build - Running Containers:
docker run - Managing Containers:
docker ps,docker stop,docker rm - Working with Images:
docker pull,docker push
Dockerfile
- Base Images: Selecting appropriate base images
- Instructions: FROM, RUN, COPY, ENV, EXPOSE
- Best Practices: Layer optimization, multi-stage builds
- Security Considerations: Minimal base images, non-root users
Docker Compose
Multi-Container Applications
- docker-compose.yml: Defining services
- Service Configuration: Networks, volumes, environment variables
- Managing Applications: Starting, stopping, scaling services
Networking
- Container Networks: Types and use cases
- Service Discovery: Container communication
- Port Mapping: Exposing container ports
Best Practices
- Image Optimization: Reducing image size
- Security: Following security guidelines
- Resource Management: Managing container resources
- Monitoring: Container health and logs