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CKS Practice Questions

Question # 1
a. Retrieve the content of the existing secret named default-token-xxxxx in the testing namespace. Store the value of the token in the token.txt
b. Create a new secret named test-db-secret in the DB namespace with the following content:
username: mysql
password: password@123
Create the Pod name test-db-pod of image nginx in the namespace db that can access test-db-secret via a volume at path /etc/mysql-credentials



Explanation:

To add a Kubernetes cluster to your project, group, or instance:

Navigate to your:
Click Add Kubernetes cluster.
Click the Add existing cluster tab and fill in the details:
Get the API URL by running this command:
kubectl cluster-info | grep -E 'Kubernetes master|Kubernetes control plane' | awk '/http/ {print $NF}'
uk.co.certification.simulator.questionpool.PList@88d23e70
kubectl get secret -o jsonpath="{['data']['ca\.crt']}"

Question # 2
Create a network policy named allow-np, that allows pod in the namespace staging to connect to port 80 of other pods in the same namespace.

Ensure that Network Policy:-

1. Does not allow access to pod not listening on port 80.br>
2. Does not allow access from Pods, not in namespace staging.br>



Explanation:

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: network-policy
spec:
podSelector: {} #selects all the pods in the namespace deployed
policyTypes:
- Ingress
ingress:
- ports: #in input traffic allowed only through 80 port only
- protocol: TCP
port: 80

Question # 3
a. Retrieve the content of the existing secret named default-token-xxxxx in the testing namespace.
Store the value of the token in the token.txt
b. Create a new secret named test-db-secret in the DB namespace with the following content:
username: mysql
password: password@123
Create the Pod name test-db-pod of image nginx in the namespace db that can access test-db-secret via a volume at path /etc/mysql-credentials



Explanation:

To add a Kubernetes cluster to your project, group, or instance:

Navigate to your:
Click Add Kubernetes cluster.
Click the Add existing cluster tab and fill in the details:
Get the API URL by running this command:
kubectl cluster-info | grep -E 'Kubernetes master|Kubernetes control plane' | awk '/http/ {print $NF}'

uk.co.certification.simulator.questionpool.PList@88d23e70
kubectl get secret -o jsonpath="{['data']['ca\.crt']}"

Question # 4
You can switch the cluster/configuration context using the following command:
[desk@cli] $ kubectl config use-context qa

Context:
A pod fails to run because of an incorrectly specified ServiceAccount
Task:
Create a new service account named backend-qa in an existing namespace qa, which must not have access to any secret.
Edit the frontend pod yaml to use backend-qa service account
Note: You can find the frontend pod yaml at /home/cert_masters/frontend-pod.yaml



Explanation:

[desk@cli] $ k create sa backend-qa -n qasa/backend-qa created[desk@cli] $ k get role,rolebinding -n qaNo resources found in qa namespace.[desk@cli] $ k create role backend -n qa --resource pods,namespaces,configmaps --verb list# No access to secret[desk@cli] $ k create rolebinding backend -n qa --role backend --serviceaccount qa:backend-qa[desk@cli] $ vim /home/cert_masters/frontend-pod.yaml

uk.co.certification.simulator.questionpool.PList@88f1bbc0 [desk@cli] $ k apply -f /home/cert_masters/frontend-pod.yamlpod created

[desk@cli] $ k create sa backend-qa -n qaserviceaccount/backend-qa created[desk@cli] $ k get role,rolebinding -n qaNo resources found in qa namespace.[desk@cli] $ k create role backend -n qa --resource pods,namespaces,configmaps --verb listrole.rbac.authorization.k8s.io/backend created[desk@cli] $ k create rolebinding backend -n qa --role backend --serviceaccount qa:backend-qarolebinding.rbac.authorization.k8s.io/backend created[desk@cli] $ vim /home/cert_masters/frontend-pod.yaml

apiVersion: v1
kind: Pod
metadata:
name: frontend
spec:

serviceAccountName: backend-qa # Add this
image: nginx
name: frontend
[desk@cli] $ k apply -f /home/cert_masters/frontend-pod.yamlpod/frontend createdhttps://kubernetes.io/docs/tasks/configure-pod-container/configure-service-account/


Question # 5
Create a PSP that will only allow the persistentvolumeclaim as the volume type in the namespace restricted.
Create a new PodSecurityPolicy named prevent-volume-policy which prevents the pods which is having different volumes mount apart from persistentvolumeclaim.
Create a new ServiceAccount named psp-sa in the namespace restricted.
Create a new ClusterRole named psp-role, which uses the newly created Pod Security Policy prevent-volume-policy
Create a new ClusterRoleBinding named psp-role-binding, which binds the created ClusterRole psp-role to the created SA psp-sa.

Hint:

Also, Check the Configuration is working or not by trying to Mount a Secret in the pod maifest, it should get failed.

POD Manifest:

apiVersion: v1
kind: Pod
metadata:
name:
spec:
containers:
- name:
image:
volumeMounts:
- name:
mountPath:
volumes:
- name:
secret:
secretName:



Explanation:

apiVersion: policy/v1beta1

kind: PodSecurityPolicy

metadata:
name: restricted
annotations:
seccomp.security.alpha.kubernetes.io/allowedProfileNames: 'docker/default,runtime/default'
apparmor.security.beta.kubernetes.io/allowedProfileNames: 'runtime/default'
seccomp.security.alpha.kubernetes.io/defaultProfileName: 'runtime/default'
apparmor.security.beta.kubernetes.io/defaultProfileName: 'runtime/default'
spec:
privileged: false
# Required to prevent escalations to root.
allowPrivilegeEscalation: false
# This is redundant with non-root + disallow privilege escalation,
# but we can provide it for defense in depth.
requiredDropCapabilities:
- ALL
# Allow core volume types.
volumes:
- 'configMap'
- 'emptyDir'
- 'projected'
- 'secret'
- 'downwardAPI'
# Assume that persistentVolumes set up by the cluster admin are safe to use.
- 'persistentVolumeClaim'
hostNetwork: false
hostIPC: false
hostPID: false
runAsUser:
# Require the container to run without root privileges.
rule: 'MustRunAsNonRoot'
seLinux:
# This policy assumes the nodes are using AppArmor rather than SELinux.
rule: 'RunAsAny'
supplementalGroups:
rule: 'MustRunAs'
ranges:
# Forbid adding the root group.
- min: 1
max: 65535
fsGroup:
rule: 'MustRunAs'
ranges:
# Forbid adding the root group.
- min: 1
max: 65535
readOnlyRootFilesystem: false

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Linux Foundation CKS Exam Dumps

Exam Name: Certified Kubernetes Security Specialist (CKS)
Certification Name: Kubernetes Security Specialist

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  • Total Questions: 48
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