Summary of "Day-36 | KUBERNETES INTERVIEW QUESTIONS PART-1| What's Your Score ? |10/10| #kubernetes #devops #k8s"
Overview
The video “Day-36 | KUBERNETES INTERVIEW QUESTIONS PART-1” by Abhishek is a mock interview-style tutorial focused on fundamental Kubernetes concepts and commonly asked interview questions. It is part of a larger 45-day DevOps course and aims to help viewers assess their understanding of Kubernetes topics covered in previous lessons.
Key Technological Concepts and Product Features Covered
1. Difference between Docker and Kubernetes
- Docker is a container platform; Kubernetes is a container orchestration platform.
- Kubernetes provides features like auto-scaling, auto-healing, load balancing, and multi-node cluster management, which Docker alone does not.
- Kubernetes supports extending capabilities via custom resource definitions and controllers (e.g., Ingress controllers).
2. Kubernetes Architecture Components
- Divided into Control Plane and Data Plane.
- Control Plane includes:
- API Server
- Scheduler
- etcd (object store)
- Controller Manager
- Cloud Controller Manager (integrates with cloud providers like AWS)
- Data Plane includes:
- kubelet (manages pod lifecycle)
- kube-proxy (manages networking and IP tables)
- Container runtime (Docker shim, containerd, CRI-O)
- Kubernetes no longer bundles Docker shim by default; users must install container runtimes separately.
3. Differences between Docker Swarm and Kubernetes
- Docker Swarm is simpler, easier to install, and suited for small-scale applications.
- Kubernetes is more popular, supports enterprise-level scaling, advanced networking (Flannel, Calico, OVN), and extensibility through custom controllers.
4. Difference between Docker Container and Kubernetes Pod
- A Pod is the smallest deployable unit in Kubernetes and can contain one or more containers sharing the same network and storage.
- Pods are defined via YAML files specifying runtime specifications.
5. Namespaces in Kubernetes
- Logical isolation within a single Kubernetes cluster to separate resources for multiple projects or teams.
- Namespaces enable resource, network, and access isolation using RBAC (Role-Based Access Control).
6. Role of kube-proxy
- Manages network rules on nodes to route traffic to pods using IP tables or IPVS.
- Enables services like NodePort by updating networking rules so requests to node IP and port reach the correct pod.
7. Types of Kubernetes Services
- ClusterIP: Accessible only inside the cluster.
- NodePort: Exposes service on each node’s IP at a static port, accessible within the organization’s network.
- LoadBalancer: Creates an external load balancer (via cloud provider) to expose service publicly.
8. Role of kubelet
- Watches pod lifecycle on worker nodes, reports pod status to API server, and ensures pods are running as expected.
- Communicates with controllers (ReplicaSet, Deployment) to maintain desired pod count.
9. Day-to-Day Activities on Kubernetes (DevOps perspective)
- Managing Kubernetes clusters and application deployments.
- Monitoring cluster health and troubleshooting issues related to pods, services, and networking.
- Performing maintenance tasks like upgrading nodes and ensuring security compliance.
- Acting as subject matter experts to support development teams.
Format and Approach
- The video presents 10 scenario-based interview questions.
- Viewers are encouraged to pause and attempt answers before explanations are given.
- The instructor emphasizes phrasing answers well and being confident during interviews.
- References to previous detailed videos (Day 31, 32, 33, 35) are provided for deeper understanding.
Future Content Teasers
- Practical implementation of services and Ingress.
- Custom Resource Definitions (CRDs).
- Helm package manager.
- Kubernetes Interview Questions Part-2.
Main Speaker
- Abhishek, the course instructor and YouTube channel host.
Overall, this video serves as a guided self-assessment tool and a concise review of core Kubernetes concepts, architecture, and practical knowledge essential for DevOps roles and Kubernetes interviews.
Category
Technology
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