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What is Docker?
Docker is a platform for developing, shipping, and running applications in lightweight, portable containers. It packages an application with all its dependencies, ensuring consistency across different environments.
Basic Docker Commands You Should Know:
Pull an image from Docker Hub docker pull nginx Run a container from an image docker run -d -p 8080:80 --name my-nginx nginx List running containers docker ps List all containers (including stopped ones) docker ps -a Stop a container docker stop my-nginx Remove a container docker rm my-nginx Build a Docker image from a Dockerfile docker build -t my-app . View logs of a running container docker logs my-nginx
What is Kubernetes?
Kubernetes (K8s) is an open-source container orchestration platform that automates deployment, scaling, and management of containerized applications.
Essential Kubernetes Commands You Should Know:
Get cluster information kubectl cluster-info List all pods kubectl get pods List all deployments kubectl get deployments Describe a pod kubectl describe pod <pod-name> Create a deployment kubectl create deployment nginx --image=nginx Expose a deployment as a service kubectl expose deployment nginx --port=80 --type=LoadBalancer Scale a deployment kubectl scale deployment nginx --replicas=3 Delete a pod kubectl delete pod <pod-name> Apply a YAML configuration file kubectl apply -f deployment.yaml
Key Differences Between Docker and Kubernetes
| Feature | Docker | Kubernetes |
|–|–||
| Purpose | Containerization | Container Orchestration |
| Scalability | Manual scaling | Auto-scaling & load balancing |
| Complexity | Simple for single containers | Complex for multi-container setups |
| Use Case | Small apps, local development | Large-scale, microservices |
When to Use Docker?
✅ Single-container applications
✅ Local development & testing
✅ Quick prototyping
✅ CI/CD pipelines for simple deployments
When to Use Kubernetes?
✅ Microservices architecture
✅ High-availability requirements
✅ Auto-scaling needs
✅ Multi-cloud or hybrid deployments
What Undercode Say
Docker simplifies containerization, while Kubernetes excels in managing distributed systems. For beginners, start with Docker to understand containers, then move to Kubernetes for production-grade orchestration.
Additional Linux & IT Commands for DevOps:
Check running processes in Linux top Monitor disk usage df -h Check memory usage free -m Search for a file find / -name "filename" Network troubleshooting ping google.com traceroute google.com netstat -tuln Windows equivalent commands (PowerShell) Get-Process Get-DiskUsage Test-NetConnection google.com
Expected Output: A well-structured comparison with actionable commands for both Docker and Kubernetes.
References:
Reported By: Satya619 Docker – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
