Learn DOCKER with Real Code Examples

Docker Daemon (dockerd) manages images, containers, and networks

Docker CLI communicates with Docker Daemon

Images built from Dockerfiles

Containers run from images with isolated filesystem, network, and process space

Optional orchestration with Docker Compose or Swarm

Dockerfile defines image

Docker Engine builds image

Container runs isolated app with dependencies

Networking and volumes configured

Container interacts with host and other containers

Image -> Container model

Layered filesystem in images

Container isolation via namespaces and cgroups

Networking for inter-container communication

Orchestration via Compose, Swarm, or Kubernetes

Microservices architecture with containerized services

CI/CD pipelines building and deploying containers

Multi-container apps with databases and caches

Cloud-native deployments using ECS, GCP, or Azure

Hybrid on-premises and cloud container environments

Lightweight containerization

Environment consistency across dev/test/prod

Portability and reproducibility

Seamless integration with DevOps pipelines

Modular and extensible architecture

Use stateless containers for horizontal scaling

Leverage Docker Compose for multi-service orchestration

Integrate with Swarm or Kubernetes for large clusters

Monitor resource usage and optimize images

Use container registries for automated deployment pipelines

Update Docker Engine and CLI

Refactor Dockerfiles for multi-stage builds

Test container behavior on new versions

Update Compose files if using new features

Deploy incrementally to ensure stability