CKAD-exam-notes

CKAD Exam Notes and Tips

• Course I used for prepration: https://www.udemy.com/course/certified-kubernetes-application-developer/
• Practice repo for prepration: https://github.com/dgkanatsios/CKAD-exercises (practice it 4-5 times)
• Another practice repo: https://github.com/bmuschko/ckad-prep
• Book I referenced : https://www.manning.com/books/kubernetes-in-action
• I used katacode heavily to practice : https://www.katacoda.com/courses/kubernetes/playground

Time saving tips

• vim shortcuts

• Create shortcuts for kubectl commands

alias k=kubectl
complete -F __start_kubectl k (auto completes k)

• Set context for env

kubectl config set-context <context of qn> --namespace <namespace of qn>
kubectl config set-context $(kubectl config current-context) --namespace abc (switching context to ns abc)
kubectl config view | grep namespace (verify namespace context)

• Kubectl explain command

k explain pod.spec
k explain pod.spec.containers --recursive
k explain pod.spec | grep -i nodeselector (to confirm the attribute)
k explain pod.spec.nodeselector

• Kubectl help command

k annotate --help | head -30

• Grep from output

k describe pod <pod-name> | grep -i events -A 10
k describe pod <pod-name> | grep -i events -A 10 > events.txt (output it to file)
k describe pod <pod-name> | grep --context=10 Events: (output 10 lines above and below) 

The -A option essentially means 'after,' so you're saying give me the search results that start with 'events' and then the next 10 lines too.

k describe pods | grep -C 10 "author=John Doe" (grep surrounding 10 line of annotation)
k get pods -o yaml | grep -C 5 labels: (Print labels of all the pods in yaml output)

• Get root privileges if need to login into another node

sudo -i

• Bookmark kubernetes.io documentation important pages

• bash commands

Curriculam

• Core Concepts - 13%
  • API Primitives
  • Basic Pods
  • Replica Sets
  • Deployments
  • Namespaces
• Configuration - 18%
  • Command and Arguments
  • ConfigMaps
  • Secrets
  • SecurityContexts
  • Resource Requirements
  • Service Accounts
  • Taints and Tolerations
• Multi-Container Pods - 10%
  • Design Patterns: Ambassador, Adapter, Sidecar
• Pod Design - 20%
  • Labels, Selectors, and Annotations
  • Deployments and Rolling Updates
  • Jobs and CronJobs
• - State Persistence - 8%
  • Volumes and Mounts
  • Persistent Volume and Claims
• Observability - 18%
  • Liveness and Readiness Probes
  • Container Logging and Debugging
• Services and Networking - 13%
  • Services
  • Ingress
  • Networking Policies

Notes

• core concepts
• configuration
• multi container pods
• pod design
• state persistence
• observability
• services and networking