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| Certification Vendor: | Linux Foundation |
|---|---|
| Exam Name: | Certified Kubernetes Security Specialist (CKS) Exam |
| Exam Number: | CKS |
| Certificate Validity Period: | 2 years |
| Exam Duration: | 120 minutes |
| Related Certifications: | Certified Kubernetes Administrator (CKA) Certified Kubernetes Application Developer (CKAD) |
| Exam Price: | USD 395 |
| Passing Score: | Not publicly disclosed |
| Real Exam Qty: | Performance-based tasks (no fixed number) |
| Exam Format: | Hands-on lab (Kubernetes environment), Terminal-based tasks, Performance-based exam |
| Available Languages: | English |
| Recommended Training: | Kubernetes Security Essentials (Linux Foundation Training) CKS Exam Preparation Course |
| Exam Registration: | Linux Foundation Candidate Handbook Linux Foundation Certification Page |
| Sample Questions: | Linux Foundation CKS 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/ |
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Linux Foundation CKS (Certified Kubernetes Security Specialist) Certification Exam is a highly sought-after certification for individuals who want to demonstrate their expertise in securing containerized applications using Kubernetes. Kubernetes has become the de facto standard for container orchestration, and as such, it is crucial to have professionals who can secure the platform and the applications running on it.
The CKS certification exam is designed for individuals who have a deep understanding of Kubernetes security and are experienced in implementing security best practices in a Kubernetes environment. CKS Exam covers a wide range of topics, including cluster setup, securing the Kubernetes API, network policies, securing Kubernetes workloads, and monitoring and logging. Candidates must be familiar with various Kubernetes security tools and be able to troubleshoot common security issues.
NEW QUESTION # 63
You're working with a Kubernetes cluster where you need to enforce a secure supply chain. You have a Kubernetes deployment that utilizes a container image from a specific registry. How would you configure your Kubernetes cluster to only allow images from this registry to be used in deployments?
Answer:
Explanation:
Solution (Step by Step) :
1. Create a PodSecurityPolicy (PSP):
- A PSP is a policy that enforces security restrictions on pods. We will use it to restrict image pulls to a specific registry.
- create a PSP YAML file.
2. Define Allowed Registries: - Within the 'spec' of your PSP, create a field 'seLinux' and then define the allowed registries within the 'seLinux' field. - Example:
3. Apply the PSP: - Apply the PSP to your cluster using kubectl apply -f restricted-registry-psp.yaml' 4. Create a Service Account: - Create a service account that will be allowed to run pods with this PSP:
5. Bind the PSP to the Service Account: - Add the 'securityContext' field to your deployment and specify the PSP you just created:
- Apply the deployment: bash kubectl apply -f deploymentyaml - Now, the deployment will only be able to pull images from the specified registry-
NEW QUESTION # 64
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 # 65
You have an Nginx pod deployed in your Kubernetes cluster. You need to set up a PodSecurityPolicy (PSP) that allows the Nginx pod to access only specific network ports and disallows it from accessing other ports. Describe the steps you would take to implement this PSP.
Answer:
Explanation:
Solution (Step by Step) :
1. Create PodSecurityPolicy (PSP):
- Define a PodSecurityPolicy (PSP) YAML file. This file will restrict the Nginx pod's network access.
- For example, you could define a PSP that allows the Nginx pod to access ports 80 and 443 (HTTP and HTTPS) but restricts access to all other ports:
2. Apply the PSPI - Apply the PSP YAML file using 'kubectl apply -f nginx-psp.yaml' 3. Bind the PSP to the Nginx Pod: - Update the Nginx deployment or pod definition to include the 'securityContext' field with a reference to the created PSP:
4. Verify the psp: - Check that the Nginx pod is using the PSP by running 'kubectl describe pod ' . You should see the PSP name listed in the "Security Context" section. 5. Test Access: - Verity that the Nginx pod can access ports 80 and 443 but not other ports. You can use tools like 'telnet or 'nc' to test connectivity.
NEW QUESTION # 66
You are managing a Kubernetes cluster with several deployments running different microservices. You need to ensure that all pods are running with appropriate security context constraints (SCCs) to minimize the risk of privilege escalation and other security vulnerabilities. Explain how you would implement and enforce pod security standards using SCCs, providing specific examples ot common security constraints and how you would configure them for various deployment scenarios.
Answer:
Explanation:
Solution (Step by Step) :
1. Define Security Context Constraints (SCCs):
- Create a new SCC resource. Here's an example for a restrictive SCC named "restricted-scc"'
2. Apply the SCC to Deployments: - Add a 'securitycontext' section to your Deployment resources to apply the SCC- Here's an example:
3. Test and Evaluate: - After deploying with the SCC, test the deployment and verify that the pod is created with the expected security restrictions. - Use 'kubectl get pods -l app=my-apps to verify the pod's status and Its security context. Key Security Constraints in the Example: - 'allowPriviIegeEscaIation: false': Prevents containers from escalating their privileges. - 'readOnIyRootFiIesystem: true': Prevents modification of the root filesystem, reducing the risk of malicious code tampering. - 'privileged: false: Disallows running containers with root privileges, mitigating security risks. - 'volumes': Restricts the types of volumes that can be used, limiting access to sensitive data or resources. Deployment Scenario: - For critical services handling sensitive data, use a highly restrictive SCC like the one provided. - For less critical services, you might need a more permissive SCC. - You can create different SCCs for different levels of security requirements and apply them accordingly. Important Notes: - Always test your SCCs thoroughly before implementing them in production environments. - Regularly review and update your SCCs to ensure they remain effective and in line with your security best practices. - Consider using Kubernetes security scanning tools to identifiy potential vulnerabilities in your deployments and SCC configurations.
NEW QUESTION # 67
On the Cluster worker node, enforce the prepared AppArmor profile
#include <tunables/global>
profile nginx-deny flags=(attach_disconnected) {
#include <abstractions/base>
file,
# Deny all file writes.
deny /** w,
}
EOF'
Answer: A
Explanation:
apiVersion: v1
kind: Pod
metadata:
name: apparmor-pod
spec:
containers:
- name: apparmor-pod
image: nginx
Finally, apply the manifests files and create the Pod specified on it.
Verify: Try to make a file inside the directory which is restricted.
NEW QUESTION # 68
......
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