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Linux Foundation CKS Exam Overview:
| Certification Vendor: | Linux Foundation |
|---|---|
| Exam Name: | Certified Kubernetes Security Specialist (CKS) Exam |
| Exam Number: | CKS |
| Exam Price: | USD 395 |
| Certificate Validity Period: | 2 years |
| Exam Duration: | 120 minutes |
| Exam Format: | Terminal-based tasks, Hands-on lab (Kubernetes environment), Performance-based exam |
| Related Certifications: | Certified Kubernetes Administrator (CKA) Certified Kubernetes Application Developer (CKAD) |
| Passing Score: | Not publicly disclosed |
| Available Languages: | English |
| Real Exam Qty: | Performance-based tasks (no fixed number) |
| Recommended Training: | Kubernetes Security Essentials (Linux Foundation Training) CKS Exam Preparation Course |
| Exam Registration: | Linux Foundation Certification Page Linux Foundation Candidate Handbook |
| Sample Questions: |  |
| Exam Way: | Online, proctored, remote performance-based exam |
| Pre Condition: | Valid Certified Kubernetes Administrator (CKA) certification is required |
| Official Syllabus URL: | https://training.linuxfoundation.org/certification/certified-kubernetes-security-specialist/ |
Linux Foundation CKS Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Cluster Setup | 15% | - Hardening cluster components - Secure installation configuration |
| Topic 2: Monitoring, Logging and Runtime Security | 15% | - Audit logging and monitoring - Runtime threat detection |
| Topic 3: Cluster Hardening | 15% | - Authentication and authorization - API server security |
| Topic 4: Supply Chain Security | 20% | - Image scanning and verification - Secure CI/CD practices |
| Topic 5: System Hardening | 15% | - Kernel and node security configuration - Host security controls |
| Topic 6: Minimizing Microservice Vulnerabilities | 20% | - Container isolation and security contexts - Pod security standards |
CKS Exam FAQ: Study Options and Service
The CKS exam is one of the hotter assessments from Linux Foundation, and it leads to the Linux Foundation Certified Kubernetes Security Specialist (CKS) certification — a credential many IT professionals are pursuing right now. Its popularity raises the stakes of preparation: choosing the right study material is a genuinely wise decision, and it is the one fully in your hands.
Automatically, and immediately. The moment a new version of the Linux Foundation Certified Kubernetes Security Specialist (CKS) bank is released, our system sends it straight to your email — your only job is to check your inbox. This update service is free for 365 days from your purchase date, and extending it afterward costs half price with the renewal discount. The CKS exam materials never go stale on you.
Registration for the CKS exam runs through these official channels:
Register when your spare-time practice sessions are producing consistently strong results.
Valid Certified Kubernetes Administrator (CKA) certification is required
The official outline divides the CKS exam into weighted domains, including:
- Supply Chain Security (20%)
- Cluster Hardening (15%)
- System Hardening (15%)
The Linux Foundation Certified Kubernetes Security Specialist (CKS) bank at Real4Prep is created by IT experts and certified trainers around these same objectives, and updated daily against them.
Classes have fixed schedules, commutes, and course fees; self-paced preparation has none of those. With the Linux Foundation Certified Kubernetes Security Specialist (CKS) materials, you practice the CKS exam questions in your spare time, on any device, reviewing only what your results say needs review — a structure that saves both time and money. The content is created by IT experts and certified trainers, so flexibility costs you nothing in quality.
Linux Foundation recommends these training resources for candidates:
Official training and self-paced practice answer different needs — many candidates use official resources for depth and our bank for daily exam readiness.
Passing the CKS exam requires Not publicly disclosed, and registration costs USD 395. Smart preparation is simply the strategy of protecting that fee with practice that mirrors the real thing.
The CKS exam contains Performance-based tasks (no fixed number) questions with 120 minutes minutes to complete them. The online test engine recreates that atmosphere on any device, so the real exam feels like a repeat performance.
Linux Foundation Certified Kubernetes Security Specialist (CKS) Sample Questions:
SIMULATION
Context
A container image scanner is set up on the cluster, but it's not yet fully integrated into the cluster s configuration. When complete, the container image scanner shall scan for and reject the use of vulnerable images.
Task
Given an incomplete configuration in directory /etc/kubernetes/epconfig and a functional container image scanner with HTTPS endpoint https://wakanda.local:8081 /image_policy :
1. Enable the necessary plugins to create an image policy
2. Validate the control configuration and change it to an implicit deny
3. Edit the configuration to point to the provided HTTPS endpoint correctly Finally, test if the configuration is working by trying to deploy the vulnerable resource /root/KSSC00202/vulnerable-resource.yml.
Correct Answer:
See the Explanation belowExplanation:
SIMULATION
A container image scanner is set up on the cluster.
Given an incomplete configuration in the directory
/etc/kubernetes/confcontrol and a functional container image scanner with HTTPS endpoint https://test-server.local.8081/image_policy
1. Enable the admission plugin.
2. Validate the control configuration and change it to implicit deny.
Finally, test the configuration by deploying the pod having the image tag as latest.
Correct Answer:
SeetheExplanationbelowExplanation:
ssh-add ~/.ssh/tempprivate
eval "$(ssh-agent -s)"
cd contrib/terraform/aws
vi terraform.tfvars
terraform init
terraform apply -var-file=credentials.tfvars
ansible-playbook -i ./inventory/hosts ./cluster.yml -e ansible_ssh_user=core -e bootstrap_os=coreos -b --become-user=root --flush-cache -e ansible_user=core
SIMULATION
Context
AppArmor is enabled on the cluster's worker node. An AppArmor profile is prepared, but not enforced yet.
Task
On the cluster's worker node, enforce the prepared AppArmor profile located at /etc/apparmor.d/nginx_apparmor.
Edit the prepared manifest file located at /home/candidate/KSSH00401/nginx-pod.yaml to apply the AppArmor profile.
Finally, apply the manifest file and create the Pod specified in it.
Correct Answer:
See the Explanation belowExplanation:
SIMULATION
You must complete this task on the following cluster/nodes:
Cluster: trace
Master node: master
Worker node: worker1
You can switch the cluster/configuration context using the following command:
[desk@cli] $ kubectl config use-context trace
Given: You may use Sysdig or Falco documentation.
Task:
Use detection tools to detect anomalies like processes spawning and executing something weird frequently in the single container belonging to Pod tomcat.
Two tools are available to use:
1. falco
2. sysdig
Tools are pre-installed on the worker1 node only.
Analyse the container's behaviour for at least 40 seconds, using filters that detect newly spawning and executing processes.
Store an incident file at /home/cert_masters/report, in the following format:
[timestamp],[uid],[processName]
Note: Make sure to store incident file on the cluster's worker node, don't move it to master node.
Correct Answer:
See the Explanation below
Explanation:
$vim /etc/falco/falco_rules.local.yaml
- rule: Container Drift Detected (open+create)
desc: New executable created in a container due to open+create
condition: >
evt.type in (open,openat,creat) and
evt.is_open_exec=true and
container and
not runc_writing_exec_fifo and
not runc_writing_var_lib_docker and
not user_known_container_drift_activities and
evt.rawres>=0
output: >
%evt.time,%user.uid,%proc.name # Add this/Refer falco documentation
priority: ERROR
$kill -1 <PID of falco>
Explanation:
[desk@cli] $ ssh node01
[node01@cli] $ vim /etc/falco/falco_rules.yaml
search for Container Drift Detected & paste in falco_rules.local.yaml
[node01@cli] $ vim /etc/falco/falco_rules.local.yaml
- rule: Container Drift Detected (open+create)
desc: New executable created in a container due to open+create
condition: >
evt.type in (open,openat,creat) and
evt.is_open_exec=true and
container and
not runc_writing_exec_fifo and
not runc_writing_var_lib_docker and
not user_known_container_drift_activities and
evt.rawres>=0
output: >
%evt.time,%user.uid,%proc.name # Add this/Refer falco documentation
priority: ERROR
[node01@cli] $ vim /etc/falco/falco.yaml
SIMULATION
Documentation
Deployment, Pod Security Admission, Pod Security Standards
You must connect to the correct host . Failure to do so may result in a zero score.
[candidate@base] $ ssh cks000036
Context
For compliance, all user namespaces enforce the restricted Pod Security Standard .
Task
The confidential namespace contains a Deployment that is not compliant with the restricted Pod Security Standard . Thus, its Pods can not be scheduled.
Modify the Deployment to be compliant and verify that the Pods are running.
The Deployment's manifest file can be found at /home/candidate/nginx-unprivileged.yaml.
Correct Answer:
See the Explanation below for complete solution
Explanation:
1) Connect to the correct host
ssh cks000036
sudo -i
export KUBECONFIG=/etc/kubernetes/admin.conf
2) Confirm the failing Pods + see the PSA error (fast)
kubectl -n confidential get deploy
kubectl -n confidential get pods
kubectl -n confidential describe deploy <deployment-name> | sed -n '/Events/,$p' (You'll usually see "violates PodSecurity 'restricted' ..." with the exact missing fields.)
3) Edit the provided manifest
vi /home/candidate/nginx-unprivileged.yaml
You must ensure the Pod template becomes compliant. Add/ensure the following exact blocks:
4) Add Pod-level securityContext (under spec.template.spec)
Find:
spec:
template:
spec:
Add this block under it (or merge if securityContext: already exists):
securityContext:
runAsNonRoot: true
runAsUser: 65535
seccompProfile:
type: RuntimeDefault
5) Add Container-level securityContext (under the nginx container)
Find:
containers:
- name: ...
image: ...
Under that container, add (or adjust) this exact block:
securityContext:
allowPrivilegeEscalation: false
readOnlyRootFilesystem: true
capabilities:
drop:
- ALL
If there are multiple containers, apply the same container securityContext to each one.
Save and exit:
:wq
6) Apply the manifest to the confidential namespace
kubectl -n confidential apply -f /home/candidate/nginx-unprivileged.yaml Wait rollout:
kubectl -n confidential rollout status deployment/<deployment-name>
If you don't know the deployment name from the file, list:
kubectl -n confidential get deploy
7) Verify Pods are running
kubectl -n confidential get pods -o wide
If still failing, show the exact PSA violation (this tells you what else to fix):
kubectl -n confidential describe pod <pod-name> | sed -n '/Events/,$p'
Quick "if it still fails" fixes (common restricted blockers)
Open the manifest again and ensure these are NOT set (or are removed/false):
hostNetwork: true
hostPID: true
hostIPC: true
any hostPort:
privileged: true
capabilities.add:
seccompProfile: Unconfined
runAsUser: 0 or runAsNonRoot: false
Then re-apply.
Minimal compliant result (what the grader expects)
Your Pod template should include:
seccompProfile: RuntimeDefault
runAsNonRoot: true (and a non-root UID like 65535)
container: allowPrivilegeEscalation: false
container: capabilities.drop: [ALL]
container: readOnlyRootFilesystem: true
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