Trabalhando com kubectl: sua ferramenta de controle do cluster

kubectl is the official CLI that talks to the Kubernetes API server. Nearly every cluster operation, creating, reading, updating, deleting resources, goes through it.

kubectl reads a kubeconfig file (default ~/.kube/config) that holds cluster endpoints, users, and credentials grouped into contexts.

kubectl get lists resources. Add -o wide for more columns or -A for all namespaces.

kubectl describe shows detailed, human-readable status plus an events section that is invaluable for debugging.

Apply a manifest file with kubectl apply -f. This is declarative: you describe the desired state and Kubernetes reconciles to it.

For quick experiments you can create resources imperatively.

Stream container output with kubectl logs. Use -f to follow and --previous to see a crashed container.

Open a shell inside a running container to debug interactively.

Edit live resources or remove them. Prefer editing manifests in git over edit for production.

Most commands accept -n namespace. Set a default namespace to avoid repeating it.

Use -o yaml or -o json to see the full object, and -o jsonpath to extract a single field.

Test what you have learned.

You practiced the core kubectl verbs: get, describe, apply, logs, exec, delete, plus contexts, namespaces, and output formats to control and debug your cluster.