kubectl get -l
- Docker & Kubernetes course
- Intermediate
- Lesson 64/82
- 4 min
Learn to filter by label with the -l flag.
kubectl get -l
-l (--selector) filters objects by label in kubectl commands. A comma means AND; != means not equal, and !key means the key is absent:
kubectl get pods -l app=web
kubectl get pods -l app=web,ortam=prod
kubectl get pods -l 'ortam!=prod'
kubectl get pods -l '!katman'
kubectl get pods -L app,ortam # show labels as columnsBulk operations with selectors
Selectors aren't only for listing; they also do bulk operations such as deleting, reading logs, scaling and labelling:
kubectl delete pods -l app=web,ortam=test
kubectl logs -l app=web --tail=5 --prefix # logs of all replicas
kubectl rollout restart deploy -l takim=odemeBefore a bulk delete, running get with the same selector to see what will be deleted is a good habit.
Practice Operations by label
Write three commands: list the pods labelled app=web and ortam=prod with app and ortam columns; show the last 5 log lines of all pods labelled app=web with prefixes; delete the pods labelled ortam=test.
Starter code
# buraya yazSample solution
kubectl get pods -l app=web,ortam=prod -L app,ortam
kubectl logs -l app=web --tail=5 --prefix
kubectl delete pods -l ortam=testExpected output
NAME READY STATUS APP ORTAM web-7c5b9f6d8-abcde 1/1 Running web prod [pod/web-7c5b9f6d8-abcde/nginx] 10.244.1.1 - - "GET / HTTP/1.1" 200 615 pod "web-test-1" deleted
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 Which pods does kubectl get pods -l app=web,ortam=prod list?
- Only those with app=web
- None
- Those with both app=web and ortam=prod Correct answer
- Those with app=web or ortam=prod
Explanation: A comma is AND.
2 Show labels as columns.
kubectl get pods ____ app,ortamkubectl get pods -L app,ortamExplanation: Uppercase L (--label-columns) adds columns.
3 Match.
| Term | Meaning |
|---|---|
-l a=b,c=d |
AND |
-l 'a!=b' |
Not equal |
-l '!a' |
Key absent |
-L a |
Show as a column |