Jan 16
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Docker is one of the most used tools in DevOps, cloud computing, and data engineering. It enables developers to package applications into lightweight, portable containers that run consistently across different environments — from development to production. Whether you’re deploying web apps, running ML pipelines, or managing microservices, mastering Docker commands is a must for every DevOps Engineer, Data Scientist, and Software Developer. Here’s a breakdown of the top 10 Docker commands you should know: docker --version — Displays the installed Docker version, confirming the setup. docker ps — Lists currently running containers with details like container ID, ports, and names. docker ps -a — Shows all containers, including those that are stopped or exited. docker pull v image_name v — Downloads an image from Docker Hub or another registry. docker run -d -p 8080:80 v image_name v — Runs a container in detached mode while mapping ports. docker stop v container_id v — Stops a running container gracefully. docker rm v container_id v — Deletes a stopped container to free system resources. docker rmi v image_name v — Removes an unused Docker image from the local machine. docker info — Displays system-wide information about containers, images, and configuration. docker system prune -a — Cleans up unused images, containers, and networks to optimize disk space. Docker simplifies deployment by making apps environment-independent, ensuring reliability and scalability — key requirements in today’s CI/CD pipelines and microservices architecture. 🧠 5 Common Docker Interview Questions & Answers Q1. What is Docker, and why is it used? A1. Docker is a containerization platform that allows developers to package applications with all dependencies, ensuring consistency across environments. Q2. What is the difference between a Docker image and a container? A2. An image is a template used to create containers; a container is a running instance of that image. Q3. How does Docker differ from a virtual machine? A3. Docker containers share the host OS kernel and are lightweight, while VMs include a full OS and are heavier. Q4. What is Docker Hub? A4. Docker Hub is a cloud-based registry where developers can find, share, and manage container images. Q5. What are Docker volumes used for? A5. Docker volumes are used to persist data generated by and used within containers, ensuring it’s not lost when containers are removed. #docker #devops #softwareengineering #cloudcomputing #datascience #ai #ml #cloudengineering #dockercontainers #kubernetes #programming #softwaredevelopment #microservices #containerization #developer #tech #opensource