Docker & Kubernetes · Module 08

Kubernetes – API Objects, Namespaces and Pods

Read and write manifests, split a cluster with namespaces, create and debug pods, select objects with labels, set requests/limits and use init containers.

Practice interactively →

What you will learn

• Recognise apiVersion, kind, metadata, spec, status and look up schemas with kubectl explain
• Work with namespaces and understand their scope
• Create pods, configure probes and debug with describe, logs and exec
• Add labels, filter with selectors and set nodeSelector
• Set resource requests/limits and use init containers

Lessons

1. The Kubernetes API and object model

   Everything in Kubernetes is an API object; a manifest declares desired state with apiVersion, kind, metadata and spec.

2. Namespaces

   Namespaces split one cluster into logical areas to separate environments, set quotas and assign permissions.

3. Pods — spec, probes and debugging

   A pod is the smallest unit; declare containers and probes, then debug with describe, logs, exec and port-forward.

4. Labels and selectors

   Labels are key=value pairs that group objects; selectors use labels to pick objects, from kubectl to Services and Deployments.

5. Resource requests/limits and init containers

   A request is the guaranteed share used for scheduling; a limit is the ceiling; init containers finish before the main containers start.