DevOps in Kubernetes: 5.1 Introduction: What Kubernetes Is, and Whether You Need It 43 5.1.1 The Core Idea 44 5.1.2 Do You Need It? 44 5.2 Containers and Images 45 5.2.1 The Image 45 5.2.2 Registry and Supply Chain 45 5.3 Architecture and the Control Plane 46 5.3.1 Components

Learning Objectives

By the end of this chapter, you will be able to:

1. Explain Kubernetes as a reconciliation system and decide whether an organization actually needs it.
2. Describe the control plane components and the reconciliation loop and identify the failure modes of each.
3. Select the appropriate workload object for a given application pattern and configure it for safe production operation.
4. Configure resource requests, limits, quality-of-service classes, and probes correctly — and explain why the common defaults cause outages.
5. Design a multi-tenancy model, distinguishing soft tenancy from hard tenancy and knowing which controls each requirement.
6. Implement network security, identity, secrets, and admission policy to a defensible enterprise baseline.
7. Operate clusters through upgrades, capacity change, and failure, with tested backup and recovery.
8. Evaluate cost drivers in Kubernetes and apply the optimizations that actually matter.
9. Assess cluster maturity and sequence an adoption roadmap from first workload to governed platform.
10. Recognize the anti-patterns that cause most enterprise Kubernetes failures.