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Kubernetes

Eighteen hands-on lessons with a live cluster you can poke: from "what is it" and storage to probes, RBAC, autoscaling, Helm and troubleshooting.

18 lessons ready3 modulesabout 4.2 hours63 quiz questions
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Module 1

The big picture

Beginner
  1. 1What is Kubernetes?Why Kubernetes exists, what "desired state" means, and your first deployment.
  2. 2Kubernetes ArchitectureA cluster has two halves: the control plane that decides, and worker nodes that run your apps.
  3. 3Inside the Control PlaneAPI server, etcd, scheduler and controller manager: four parts, one hub, always watching.
  4. 4Inside a Worker Nodekubelet, container runtime and kube-proxy: the three parts that actually run your apps.

Module 2

Running apps

Intermediate
  1. 5Pods, Deployments and ServicesWhat each one is for, how a rolling update works, and the three Service types.
  2. 6Kubernetes NetworkingPod IPs, Services and DNS, Ingress for traffic coming in, and NetworkPolicy to lock things down.
  3. 7Namespaces, Labels and SelectorsHow to keep a busy cluster organised: departments, sticky notes, and questions.
  4. 8ConfigMaps and SecretsKeep settings and passwords out of your image, and give them to pods three different ways.
  5. 9Volumes: PV, PVC and StorageClassWhy pod data disappears, and how PersistentVolumes, claims and StorageClasses keep it safe.

Module 3

Production skills

Advanced
  1. 10Ingress and the Gateway APIOne public address, many apps: route outside traffic to Services by host name and URL path, first with Ingress and then with the newer Gateway API.
  2. 11Health checks: liveness and readiness probesRunning is not the same as working. Teach Kubernetes to hold traffic back from a pod that is still starting, and to restart one that is stuck.
  3. 12Resource requests and limitsTell Kubernetes how much CPU and memory a pod needs (requests) and may use (limits). See pods stay Pending when the cluster is full, and a pod get OOMKilled.
  4. 13RBAC: who can do whatGive a developer read-only access to pods and nothing more: Roles, RoleBindings, and how to test permissions with kubectl auth can-i.
  5. 14StatefulSets and DaemonSetsTwo workload types for special jobs: StatefulSets for pods that need a stable name and their own disk (databases), and DaemonSets for one pod on every node (log collectors).
  6. 15Jobs and CronJobsRun a task once until it succeeds (a database migration), watch retries on failure, and run one on a schedule (a nightly backup).
  7. 16Autoscaling (HPA)Let Kubernetes add pods when traffic rises and remove them when it falls, with the Horizontal Pod Autoscaler.
  8. 17HelmThe package manager for Kubernetes: install a ready-made chart with your own settings, upgrade it, see its history, and roll back a bad release.
  9. 18Troubleshooting a broken podFour broken apps, four classic errors: ImagePullBackOff, CrashLoopBackOff, OOMKilled and Pending. Learn the routine: get, describe, logs, fix.
✓Final examTest yourself on the whole Kubernetes trackQuestions drawn from every lesson, a new mix each time. Score 70% to pass. Start the exam →

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