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Kubernetes Overview

Container orchestration simplified.

Introduction

Kubernetes automates deployment, scaling, and management of containerized applications. Learn the architecture, core components, and basic operations to manage containers at scale.

Description

Kubernetes (K8s) is a container orchestration platform that automates deploying, scaling, and managing containerized applications across clusters of machines.

Main Content

### Core Concepts - **Cluster** – Set of nodes running containerized applications. - **Node** – Worker machine in the cluster. - **Pod** – Smallest deployable unit containing one or more containers. - **Deployment** – Declarative way to manage pods. - **Service** – Exposes pods for internal or external access. - **ConfigMap & Secret** – Manage configuration and sensitive data. ### Basic Operations - `kubectl get pods` – List all pods. - `kubectl apply -f deployment.yaml` – Apply configuration. - `kubectl scale deployment <name> --replicas=3` – Scale pods. - `kubectl delete pod <name>` – Delete a pod. ### Best Practices - Use namespaces to separate environments. - Implement resource limits for containers. - Use health checks (liveness and readiness probes). - Automate deployments using CI/CD pipelines.

Conclusion

Kubernetes simplifies running containerized applications at scale by automating deployment, scaling, and management. Understanding pods, deployments, services, and best practices is crucial for modern DevOps workflows.

Interview Questions

  • What is Kubernetes and why is it used?
  • Explain the difference between a pod, node, and cluster.
  • What is a Deployment and how does it work?
  • How do you expose applications in Kubernetes?
  • What are best practices for running Kubernetes workloads?

Key Takeaways

  • Kubernetes automates management of containerized applications.
  • Pods are the basic units; deployments manage scaling and updates.
  • Services expose pods internally and externally.
  • Namespaces, resource limits, and health checks improve reliability.
  • Kubernetes enables efficient scaling and orchestration of containers.