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This is an to Docker ebook that will help you learn the basics of Docker and how to start using containers for your SysOps, DevOps, and Dev projects. No matter if you are a DevOps/SysOps engineer, developer, or just a Linux enthusiast, you will most likely have to use Docker at some point in your career.
You Should Know:
Installing Docker
On Ubuntu/Debian sudo apt update sudo apt install docker.io sudo systemctl enable --now docker On CentOS/RHEL sudo yum install docker sudo systemctl start docker sudo systemctl enable docker Verify installation docker --version
Working with Docker Containers
Run a container docker run hello-world List running containers docker ps List all containers (including stopped ones) docker ps -a Stop a container docker stop <container_id> Remove a container docker rm <container_id>
Docker Images
Pull an image docker pull ubuntu:latest List images docker images Remove an image docker rmi <image_id>
Dockerfile Basics
Sample Dockerfile FROM ubuntu:latest RUN apt update && apt install -y nginx COPY index.html /var/www/html/ EXPOSE 80 CMD ["nginx", "-g", "daemon off;"]
Docker Networking
List networks docker network ls Create a network docker network create my_network Run a container in a specific network docker run --network my_network -d nginx
Docker Volumes
Create a volume docker volume create my_volume Mount a volume in a container docker run -v my_volume:/data ubuntu
Docker Compose
Sample docker-compose.yml version: '3' services: web: image: nginx ports: - "80:80" db: image: mysql environment: MYSQL_ROOT_PASSWORD: example
Docker Security Best Practices
Run a container as non-root docker run --user 1000:1000 ubuntu Scan an image for vulnerabilities docker scan <image_name>
Kubernetes Basics (Docker Orchestration)
Minikube setup (for local Kubernetes) minikube start kubectl get pods
What Undercode Say
Docker has revolutionized containerization, making it easier to deploy applications consistently across environments. Mastering Docker commands and best practices is essential for modern DevOps workflows.
Additional Useful Commands:
Inspect a container docker inspect <container_id> View container logs docker logs <container_id> Execute a command inside a running container docker exec -it <container_id> /bin/bash Prune unused Docker objects docker system prune Build an image from a Dockerfile docker build -t my_image .
For advanced Docker usage, explore Kubernetes for orchestration and CI/CD pipelines for automation.
Expected Output:
A fully functional Docker environment with running containers, optimized images, and secure configurations.
Prediction
Docker will continue to dominate containerization, with tighter integration into cloud-native ecosystems and AI-driven DevOps pipelines.
URLs:
IT/Security Reporter URL:
Reported By: Https: – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
