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Hectal
Phase 8Advanced9 of 10 in Kubernetes

Advanced Kubernetes

Extend Kubernetes itself with your own resources and controllers, add a service mesh for genuinely advanced traffic control, and see where multi-cluster and GitOps pick up from here.

Every phase so far has used Kubernetes' own built-in resource types. This final phase covers extending the API itself — teaching Kubernetes about entirely new kinds of objects and writing the automation that manages them — plus service mesh, the layer many production clusters eventually add for traffic control and security between services, and a look at where a dedicated GitOps course would pick up from here.

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4 topics ~57 min 11 code blocks & diagrams
Start with the first topic
1
8.1

CRDs & Operators

A CustomResourceDefinition teaches the API server about an entirely new kind of object; an Operator is the controller that watches it and does something real — the same reconciliation loop from Phase 0.1, now applied to whatever you define.

14 min 1 diagram 2 code practice

2
8.2

Admission Webhooks for Custom Resources

Phase 5.4 covered admission control for built-in resources using ready-made policy engines — this topic covers the other real use case: validating and defaulting your OWN custom resources, exactly the piece a real Operator usually ships alongside its CRD.

14 min 1 diagram 2 code practice

3
8.3

Service Mesh Basics: Istio, Linkerd & mTLS

A service mesh injects a proxy alongside every pod, handling encryption, retries, and traffic routing between services automatically — genuinely powerful, and genuinely more infrastructure than most clusters actually need.

14 min 1 diagram 2 code practice

4
8.4

Multi-Cluster & Where GitOps Picks Up

Real production setups often span more than one cluster, and manage all of them by treating a Git repository as the single source of truth — a genuine, distinct approach worth understanding conceptually, even before a dedicated GitOps course goes deep.

15 min 1 diagram 1 code practice