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| Certification Vendor: | Linux Foundation / CNCF |
|---|---|
| Exam Name: | Certified Kubernetes Security Specialist |
| Exam Number: | CKS |
| Related Certifications: | Certified Kubernetes Administrator (CKA) Certified Kubernetes Application Developer (CKAD) |
| Exam Price: | $445 USD |
| Real Exam Qty: | 15-20 tasks |
| Passing Score: | 67% |
| Exam Duration: | 120 minutes |
| Available Languages: | Simplified Chinese, English, Japanese |
| Exam Format: | Performance-based, Hands-on tasks, Online proctored, Command-line operations |
| Certificate Validity Period: | 2 years |
| Recommended Training: | LFS260: Kubernetes Security Essentials |
| Exam Registration: | Linux Foundation Training Portal |
| Sample Questions: | Linux Foundation CKS Sample Questions |
| Exam Way: | Online, remotely proctored, live monitoring via webcam and screen sharing |
| Pre Condition: | Must hold valid, non-expired Certified Kubernetes Administrator (CKA) certification |
| Official Syllabus URL: | https://training.linuxfoundation.org/certification/certified-kubernetes-security-specialist/ |
In today's competitive technology sector, the Linux Foundation CKS certification is a vital credential. Many applicants, however, struggle to obtain up-to-date and genuine Linux Foundation CKS exam questions in order to successfully prepare for the exam. If you find yourself in this circumstance, don't worry since Itbraindumps has you covered with their real Linux Foundation CKS Exam Questions. Let's look at the characteristics of these Linux Foundation Certified Kubernetes Security Specialist (CKS) test Questions and how they can help you pass the Linux Foundation CKS certification exam on the first try.
Linux Foundation CKS (Certified Kubernetes Security Specialist) Certification Exam is designed for IT professionals who wish to demonstrate their expertise in securing containerized applications and Kubernetes platforms. Kubernetes has become the go-to platform for deploying and managing containerized applications, and as such, it is essential to have a solid understanding of Kubernetes security best practices. Certified Kubernetes Security Specialist (CKS) certification validates that a candidate has the necessary skills and knowledge to secure Kubernetes platforms and containerized applications.
NEW QUESTION # 51
You have a Pod that runs an application that accesses a database service running in a different namespace. You want to enforce a rule that only allows the pod to connect to the database service on a specific port. Explain how to achieve this using NetworkPolicy.
Answer:
Explanation:
Solution (Step by Step) :
1. Create a NetworkPolicy:
- Create a ' NetworkPoIicV resource that defines the rules for the pod.
- This example allows the pod to connect to the database service on port 5432 in the 'database-namespace namespace.
2. Apply the NetworkPolicy: - Apply the 'NetworkPolicy' using 'kubectl apply -f database-access-policy.yaml 3. Verify the Policy: - Run the application in the pod and attempt to connect to the database service on the specified port- - Verify that the connection is successful. - Attempt to connect to the database service on a different port or from a different namespace. - Verity that these attempts are blocked.
NEW QUESTION # 52
SIMULATION
Context
You must fully integrate a container image scanner into the kubeadm provisioned cluster.
Task
Given an incomplete configuration located at /etc/kubernetes/bouncer and a functional container image scanner with an HTTPS endpoint at https://smooth-yak.local/review, perform the following tasks to implement a validating admission controller.
First, re-configure the API server to enable all admission plugin(s) to support the provided AdmissionConfiguration.
Next, re-configure the ImagePolicyWebhook configuration to deny images on backend failure.
Next, complete the backend configuration to point to the container image scanner's endpoint at https://smooth-yak.local/review.
Finally, to test the configuration, deploy the test resource defined in /home/candidate/vulnerable.yaml which is using an image that should be denied.
You may delete and re-create the resource as often as needed.
The container image scanner's log file is located at /var/log/nginx/access_log.
Answer:
Explanation:
See the Explanation below for complete solution
Explanation:
Below is the CKS exam style "do-this-exactly" runbook for Q3. It includes the minimal discovery commands (so you don't guess filenames), then the exact lines/blocks to set.
QUESTION 3 - ImagePolicyWebhook (Validating Admission) - Exam Steps
0) SSH + root
ssh cks000002
sudo -i
1) Identify the provided config files (no guessing)
ls -la /etc/kubernetes/bouncer
You are looking for files typically named like:
admission_configuration.yaml (AdmissionConfiguration)
imagepolicywebhook.yaml (ImagePolicyWebhookConfiguration) OR the ImagePolicyWebhook config embedded inside the AdmissionConfiguration kubeconfig (webhook kubeconfig) If unsure which is which, quick peek:
grep -R "ImagePolicyWebhook" -n /etc/kubernetes/bouncer
grep -R "AdmissionConfiguration" -n /etc/kubernetes/bouncer
grep -R "kubeconfig" -n /etc/kubernetes/bouncer
PART A - Reconfigure API Server to enable required admission plugin(s)
2) Edit API server static pod manifest
vi /etc/kubernetes/manifests/kube-apiserver.yaml
2.1 Enable the admission plugin ImagePolicyWebhook
Find the line starting with:
- --enable-admission-plugins=
Ensure ImagePolicyWebhook is included in that comma list.
Example (your list may differ; just add ImagePolicyWebhook):
- --enable-admission-plugins=NodeRestriction,ImagePolicyWebhook
If the flag does not exist, add one line under command::
- --enable-admission-plugins=ImagePolicyWebhook
2.2 Point API server to the provided AdmissionConfiguration
In the same file, ensure this flag exists (use the file in /etc/kubernetes/bouncer that contains AdmissionConfiguration):
- --admission-control-config-file=/etc/kubernetes/bouncer/admission_configuration.yaml If your file is named differently, use the real filename you found in step 1, but keep the flag name exactly --admission-control-config-file.
Save/exit:
:wq
Static pod will restart automatically (kubelet watches the manifest).
Optional quick watch:
docker ps | grep kube-apiserver
# or:
crictl ps | grep kube-apiserver
PART B - Configure ImagePolicyWebhook to deny images on backend failure
3) Edit the ImagePolicyWebhook config
One of these is true on your cluster:
Option 1 (most common in these tasks): ImagePolicyWebhook config is a standalone file Edit the file in /etc/kubernetes/bouncer that contains kind: ImagePolicyWebhookConfiguration:
grep -R "kind: ImagePolicyWebhookConfiguration" -n /etc/kubernetes/bouncer vi /etc/kubernetes/bouncer/<THE_FILE_YOU_FOUND>.yaml Set (or ensure) exactly:
defaultAllow: false
Option 2: ImagePolicyWebhook config is embedded inside AdmissionConfiguration Edit the AdmissionConfiguration file:
vi /etc/kubernetes/bouncer/admission_configuration.yaml
Find the plugin section for ImagePolicyWebhook and ensure the config includes:
defaultAllow: false
✅ Save/exit:
:wq
PART C - Point backend configuration to https://smooth-yak.local/review
4) Edit the webhook kubeconfig to use the scanner endpoint
Find the kubeconfig file referenced by the ImagePolicyWebhook config.
Search for kubeConfigFile:
grep -R "kubeConfigFile" -n /etc/kubernetes/bouncer
Open that kubeconfig path (example name below; yours may differ):
vi /etc/kubernetes/bouncer/kubeconfig
In kubeconfig, set the cluster server exactly:
clusters:
- cluster:
server: https://smooth-yak.local/review
✅ Save/exit:
:wq
PART D - Restart effect (make sure API server picks up config)
Because you already edited /etc/kubernetes/manifests/kube-apiserver.yaml, the API server restarted.
To be safe (and fast), force a restart by "touching" the manifest (no content change needed):
touch /etc/kubernetes/manifests/kube-apiserver.yaml
PART E - Test: apply vulnerable workload and confirm it is denied
5) Use admin kubeconfig (because old kubectl config may break)
export KUBECONFIG=/etc/kubernetes/admin.conf
kubectl get nodes
6) Deploy the test resource (should be DENIED)
kubectl apply -f /home/candidate/vulnerable.yaml
Expected: admission error/denied message.
If it already exists:
kubectl delete -f /home/candidate/vulnerable.yaml
kubectl apply -f /home/candidate/vulnerable.yaml
PART F - Verify the scanner was called (log check)
7) Check scanner access log
tail -n 50 /var/log/nginx/access_log
You should see requests hitting /review.
Quick "what to check if it doesn't deny"
Run these in order:
Confirm API server flags:
grep -n "enable-admission-plugins" /etc/kubernetes/manifests/kube-apiserver.yaml grep -n "admission-control-config-file" /etc/kubernetes/manifests/kube-apiserver.yaml Confirm deny-on-failure:
grep -R "defaultAllow" -n /etc/kubernetes/bouncer
Must show:
defaultAllow: false
Confirm endpoint:
grep -R "server: https://smooth-yak.local/review" -n /etc/kubernetes/bouncer API server logs (docker runtime):
docker ps | grep kube-apiserver
docker logs $(docker ps -q --filter name=kube-apiserver) --tail 80
If you paste the output of:
ls -/etc/kubernetes/bouncer
grep -R "kind: AdmissionConfiguration" -n /etc/kubernetes/bouncer
grep -R "ImagePolicyWebhook" -n /etc/kubernetes/bouncer
NEW QUESTION # 53
SIMULATION
Before Making any changes build the Dockerfile with tag base:v1
Now Analyze and edit the given Dockerfile(based on ubuntu 16:04)
Fixing two instructions present in the file, Check from Security Aspect and Reduce Size point of view.
Dockerfile:
FROM ubuntu:latest
RUN apt-get update -y
RUN apt install nginx -y
COPY entrypoint.sh /
RUN useradd ubuntu
ENTRYPOINT ["/entrypoint.sh"]
USER ubuntu
entrypoint.sh
#!/bin/bash
echo "Hello from CKS"
After fixing the Dockerfile, build the docker-image with the tag base:v2 To Verify: Check the size of the image before and after the build.
Answer: A
NEW QUESTION # 54
You are working on a Kubernetes cluster and need to analyze the security posture of a user workload running within a container image. The image is built from a Dockefflle tnat pulls code from a public GitHub repository. You need to identify potential security vulnerabilities in the codebase using a static analysis tool.
Answer:
Explanation:
Solution (Step by Step) :
1. Identify the Code Repository:
- Access the public GitHub repository where the source code for the user workload resides.
2. Install KubeLinter:
- Use 'pip install kube-linter' to install KubeLinter on your machine.
3. Configure KubeLinter:
- Create a configuration file for KubeLinter (e.g., 'kube-linter.yaml') with the following content:
4. Run KubeLinter. - Execute the following command to analyze the source code: bash kube-linter --config kube-linter.yaml --path - Replace '/path/to/your/repository/' with the actual path to the GitHub repository's codebase. 5. Analyze the Results: - KubeLinter will output a report highlighting potential security vulnerabilities, coding best practices violations, and other issues detected in the codebase. - Review the findings carefully and prioritize remediation actions based on the severity and impact of the vulnerabilities.
NEW QUESTION # 55
SIMULATION
Context
The kubeadm-created cluster's Kubernetes API server was, for testing purposes, temporarily configured to allow unauthenticated and unauthorized access granting the anonymous user duster-admin access.
Task
Reconfigure the cluster's Kubernetes API server to ensure that only authenticated and authorized REST requests are allowed.
Use authorization mode Node,RBAC and admission controller NodeRestriction.
Cleaning up, remove the ClusterRoleBinding for user system:anonymous.
Answer:
Explanation:
See the Explanation below
Explanation:
NEW QUESTION # 56
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