Summary - kubectl

Combine get, describe, apply and delete to manage resources.

Summary: kubectl

In this group:

Command form: kubectl VERB RESOURCE [NAME] [flags]; abbreviations: po, deploy, svc, ns, cm.
kubeconfig contexts select cluster/user/namespace (config use-context).
get (-o wide/yaml/name/jsonpath) lists; describe gives a summary and events; explain gives field docs.
apply -f declaratively creates/updates; diff and --dry-run check first.
delete deletes by name, file or label.

kubectl create deployment api --image=api:1.0 --dry-run=client -o yaml > api.yaml
kubectl apply -f api.yaml
kubectl describe deploy api

Exercise A kubectl workflow

Write four commands: generate the YAML of an api deployment with the api:1.0 image into api.yaml without creating it; apply the file; show the api deployment in detail; list the pod names with -o name.

Show example solution

kubectl create deployment api --image=api:1.0 --dry-run=client -o yaml > api.yaml
kubectl apply -f api.yaml
kubectl describe deploy api
kubectl get pods -o name

Test yourself

What is the first place to look to understand why a pod stays Pending?
- The kubeconfig file
- The Events in the kubectl describe pod output
- kubectl get nodes
- kubectl version
Show answer

The Events in the kubectl describe pod output — The scheduler reports why it couldn't place it in an event.
Create or update the objects in the file.
```
kubectl ____ -f api.yaml
```
Show answer
```
kubectl apply -f api.yaml
```
Match.

get

List
describe

Details
apply

Apply
delete

Delete

Next lesson: What is a Pod?

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