Kubernetes

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1. aka k8s

2. pros

   1. other pros from doc

3. imperative vs declarative

4. self heading/ auto-heal

5. scaling, auto-scale

   1. HorizontalPodAutoscaler

6. cluster

7. context

8. namespaces

9. annotation

10. namespaces vs annotation vs labels

11. Finalizers

12. Node

    1. master node
    2. worker node
    3. node pool
    4. Node status
    5. Node heartbeats
    6. Node controller
       1. what it does
       2. CIDR block
    7. Node topology
    8. Graceful node shutdown
       1. grace period
       2. non-graceful shutdown

13. Pod

    1. communicate via
    2. ephemeral
    3. atomic
    4. scaling
    5. Pods life cycle
       1. when creating
       2. when deleting
          1. grace period
    6. Pod state
       1. pending
       2. running
       3. succeeded
       4. failed
       5. unknow
       6. CrashLoopBackOff
    7. init container
    8. Multi container pods
       1. sidecar pattern
       2. ambassador pattern
       3. adaptor pattern

14. Container

    1. Images
    2. - Serial and parallel image pulls
    3. - image pull policy
    4. Container Environment
    5. Container Lifecycle Hooks
       1. PostStart
       2. PreStop

15. Kubelet

16. Selectors

    1. metadata > labels
    2. spec > selector

17. Workloads

    1. pod
    2. replicaSet
       1. self-heading
       2. template
    3. deployment
       1. replicas
       2. revisionHistoryLimit
       3. Strategy
          1. RollingUpdate
          2. - maxSurge
          3. - maxUnavailable
          4. - default
          5. - rollback
          6. - rollout
          7. Recreate
    4. daemonSet
       1. daemon controller
       2. uses
       3. spec > toleration
    5. statefulSet
       1. persistent identifier
       2. creation & deletion
       3. uses
       4. headless service
    6. job, cron job
    7. replicaSet vs deployment
    8. pods vs deployment

18. Volumes

    1. persistent volume
       1. claim
       2. HostPath
       3. drawback
       4. reclaim policies
          1. delete (default)
          2. retain
       5. access modes
          1. ReadWriteMany
          2. ReadOnlyMany
          3. ReadWriteOnce
       6. states
          1. available
          2. bound
          3. released
          4. failed
    2. storage class
    3. static and dynamic

19. Objects

20. ConfigMap

    1. static
    2. solve static with volume

21. Secret

    1. type

22. Service

    1. clusterIP
       1. port
       2. targetPort
    2. nodePort
    3. load balancer
       1. L4
       2. round robin
    4. ingress
       1. L7

23. NodePort

24. k8s Cluster arch

    1. Node
       1. container runtime
          1. containerized
          2. CRI-O
       2. kubelet
       3. kube proxy
    2. Control Plane / Master node
       1. kube-api server
       2. kube-scheduler
          1. factor when scheduling
       3. Kube controller manager
          1. built-in controllers
          2. Node controller
          3. job controller
          4. endpointSlice controller
          5. serviceAccount controller
       4. Cloud controller manager
       5. ETCD
       6. Addons
       7. - DNS
       8. - WEBUI (dashboard)
       9. - cluster level logging
       10. - container resource monitoring

25. Cluster > Node > pod > container

26. CRI

27. Garbage Collection

28. Mixed Version Proxy

29. KubeCTL

30. Minikube

    1. rollout

31. Open Service Broker.

32. Ingress

33. Docker Swarm vs Kubernetes

34. Security

35. Image

    1. Untrusted registries
    2. Vulnerabilities in tools of OS or libraries

36. Authentication & Authorization

37. practices

    1. use linear images
    2. image scanning
    3. don’t use root user
    4. manage user and permission
       1. RBAC

38. statefulSet

    1. master
    2. slave

39. Yaml

40. apiVersion

41. kind

42. metdat

    1. name
    2. label
    3. namespace

43. spec

    1. containers

44. Commands k8s

    1. alias k=kubernetes
    2. k get
       1. pods
       2. svc
       3. deploy
    3. k delete -f <deployment.yaml> -f <service.yaml>
    4. k exec <pod> – nslookup <svc>

45. k config

    1. current-context
    2. get-contexts
    3. use-context <name>
    4. delete-context <name>

46. namespace

    1. k get ns or namespace
    2. k create ns <name>
    3. k delete ns <name>
    4. k config set-context --current --ns=<namespace>
    5. k get pods -n <namespace>

47. node

    1. k get nodes
    2. k describe node

48. Probes

    1. startup
    2. readiness
    3. liveness

49. Good to know

50. grep

51. docker compose watch - https://www.youtube.com/live/I-htDVxmFGM?si=5Um3NCnMi0BeAgCz

52. chroot

53. Service Mesh