Learn DOCKERFILE with Real Code Examples

Dockerize a Python Flask web application

Build a Node.js API server image with dependencies

Create a lightweight NGINX image for static websites

Use multi-stage builds to compile and package Go binaries

Package Java applications with JDK for build and JRE for runtime

Check build context for missing files

Ensure correct base image and tag

Verify network connectivity during RUN commands

Use `docker build --no-cache` to resolve caching issues

Inspect layers with `docker history` for debugging

Build and run container locally

Check logs with `docker logs`

Use healthcheck in Dockerfile for runtime checks

Test image in isolated staging environment

Automate testing in CI/CD pipeline

Run locally with `docker run`

Push image to Docker Hub or private registry

Deploy to container orchestration platforms (Kubernetes, ECS, Swarm)

Use Docker Compose for multi-container apps

Integrate into CI/CD pipelines for automated deployment

Docker Engine

Docker CLI

Docker Compose

Docker Hub / Container Registries (ECR, GCR, ACR)

Third-party image scanners and linters

CI/CD pipelines (GitHub Actions, Jenkins, GitLab CI)

Kubernetes for orchestration

Docker Swarm

Monitoring tools (Prometheus, Grafana)

Configuration management (Ansible, Terraform)

Use multi-stage builds to reduce image size

Cache dependencies to speed builds

Use official base images for security

Leverage CI/CD pipelines for automated testing

Keep Dockerfiles modular and readable

Debugging layer caching issues

Managing large image sizes

Keeping images secure and updated

Integrating with orchestration platforms

Balancing build speed vs reproducibility