Kubernetes

Table of contents

1. 1. Kubernetes Architecture

   3 tasks · 2 interviews· 28 min
   • Explain the roles of Control Plane components (API server, etcd, scheduler, controller manager)
   • Explain the roles of Worker Node components (kubelet, kube-proxy, container runtime)
   • Interact with the Kubernetes API server using basic kubectl discovery commands

   k8s-architecture

2. 2. Kubernetes Pods

   3 tasks · 2 interviews· 25 min
   • Understand Pods as the atomic unit of scheduling in Kubernetes
   • Write a basic Pod YAML manifest configuration
   • Create, inspect, and get logs from a running Pod using kubectl

   k8s-pods

3. 3. ReplicaSets and Scaling

   3 tasks · 2 interviews· 50 min
   • Understand how ReplicaSets manage identical Pod replicas and ensure self-healing
   • Use labels and selectors to bind ReplicaSets to Pods
   • Scale ReplicaSet Pod counts imperatively and declaratively

   k8s-replicasets

4. 4. Deployments and Rollouts

   3 tasks · 2 interviews· 28 min
   • Understand how Deployments orchestrate ReplicaSet changes declaratively
   • Trigger rolling updates by updating container image versions
   • Monitor rollouts and perform version rollbacks to previous states

   k8s-deployments

5. 5. ClusterIP Services

   0 tasks
   • Explain the ephemeral nature of Pod IPs and the necessity of Services
   • Define and create a ClusterIP Service to enable stable internal communication
   • Utilize CoreDNS for internal service discovery

   k8s-services-clusterip

6. 6. NodePort Services

   0 tasks
   • Understand how NodePort exposes services to traffic outside the cluster
   • Differentiate between port, targetPort, and nodePort
   • Access a service from the host machine using the node's IP and NodePort

   k8s-services-nodeport

7. 7. Namespaces

   3 tasks · 2 interviews· 30 min
   • Explain how Namespaces partition a single cluster into logical environments
   • Deploy pods and services into custom namespaces
   • Understand DNS resolution scoping within and across namespaces

   k8s-namespaces

8. 8. ConfigMaps and Secrets

   0 tasks
   • Separate runtime configuration data from container images using ConfigMaps
   • Inject sensitive credential data securely using Secrets
   • Mount ConfigMaps and Secrets as environment variables and files in a Pod volume

   k8s-configmaps-secrets

9. 9. Kubernetes Troubleshooting

   4 tasks · 2 interviews· 1 h 50 m
   • Locate and diagnose common Pod failure conditions (ImagePullBackOff, CrashLoopBackOff)
   • Debug applications using kubectl logs, describe, get, and exec

   k8s-troubleshooting