Linux Foundation Exam CKS Topic 6 Question 66 Discussion

Actual exam question for Linux Foundation's CKS exam

Question #: 66
Topic #: 6

You can switch the cluster/configuration context using the following command: [desk@cli] $kubectl config use-context dev A default-deny NetworkPolicy avoid to accidentally expose a Pod in a namespace that doesn't have any other NetworkPolicy defined.

Task: Create a new default-deny NetworkPolicy nameddeny-networkin the namespacetestfor all traffic of type Ingress + Egress

The new NetworkPolicy must deny all Ingress + Egress traffic in the namespacetest.

Apply the newly createddefault-denyNetworkPolicy to all Pods running in namespacetest.

You can find a skeleton manifests file at /home/cert_masters/network-policy.yaml

AExplanation:
master1 $k get pods -n test --show-labels
NAME READY STATUS RESTARTS AGE LABELS
test-pod 1/1 Running 0 34s role=test,run=test-pod
testing 1/1 Running 0 17d run=testing
$vim netpol.yaml
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: deny-network
namespace: test
spec:
podSelector: {}
policyTypes:
- Ingress
- Egress
master1 $k apply -f netpol.yaml
Explanation
controlplane $ k get pods -n test --show-labels
NAME READY STATUS RESTARTS AGE LABELS
test-pod 1/1 Running 0 34s role=test,run=test-pod
testing 1/1 Running 0 17d run=testing
master1 $ vim netpol1.yaml
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: deny-network
namespace: test
spec:
podSelector: {}
policyTypes:
- Ingress
- Egress
master1 $ k apply -f netpol1.yaml

Reference:
https://kubernetes.io/docs/concepts/services-networking/network-policies/
Explanation
controlplane $ k get pods -n test --show-labels
NAME READY STATUS RESTARTS AGE LABELS
test-pod 1/1 Running 0 34s role=test,run=test-pod
testing 1/1 Running 0 17d run=testing
master1 $ vim netpol1.yaml
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: deny-network
namespace: test
spec:
podSelector: {}
policyTypes:
- Ingress
- Egress
master1 $ k apply -f netpol1.yaml

Reference:
https://kubernetes.io/docs/concepts/services-networking/network-policies/

Show Suggested Answer

Suggested Answer: A

by Jesusita at Sep 17, 2024, 02:06 AM

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Easy peasy! Just run the `k get pods -n test --show-labels` command to see the pods, then create the NetworkPolicy YAML and apply it. Boom, job done!

upvoted 0 times

Annmarie

5 months ago

No problem, happy to help!

upvoted 0 times

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Theodora

5 months ago

Thanks for the tip! I'll give that a try.

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