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The CKS certification exam is designed for professionals who are already certified in the Kubernetes Administration (CKA) exam or have equivalent knowledge and experience. The CKS exam covers a broad range of topics related to Kubernetes security, including cluster hardening, network policies, authentication, authorization, and encryption. CKS Exam also tests the candidate's ability to identify and mitigate common security threats and vulnerabilities in Kubernetes clusters.
NEW QUESTION # 39
SIMULATION
Context
A CIS Benchmark tool was run against the kubeadm-created cluster and found multiple issues that must be addressed immediately.
Task
Fix all issues via configuration and restart the affected components to ensure the new settings take effect.
Fix all of the following violations that were found against the API server:
Fix all of the following violations that were found against the Kubelet:
Fix all of the following violations that were found against etcd:
Answer:
Explanation:
See the Explanation below
Explanation:
NEW QUESTION # 40
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.
Answer:
Explanation:
NEW QUESTION # 41
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
Answer: A
Explanation:
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.
NEW QUESTION # 42
You are tasked with ensuring the security of a Kubernetes cluster running a sensitive application. Describe now you would implement a "least privilege" principle for both users and service accounts in this cluster.
Answer:
Explanation:
Solution (Step by Step) :
1. User Roles and Permissions:
- Define specific roles with minimal permissions for different user groups based on their responsibilities.
- For example, developers might have access to deploy applications, while operations team members might have access to manage resources.
- use RBAC (Role-Based Access Control) in Kubemetes to define roles and assign them to users.
2. Service Account Permissions:
- Create separate service accounts for each application or service in the cluster.
- Grant the service accounts only the necessary permissions to perform their specific tasks.
- Avoid using default service accounts with broad permissions.
- Employ the "principle ot least privilege" by defining minimal permissions for service accounts.
3. Pod Security Policies (PSPs):
- Implement PSPs to enforce security constraints on pods, restricting resources that they can access.
- Define PSPs to allow only specific container images, disable privileged containers, limit resource requests, and enforce other security controls.
- Consider using Pod Security Admission (PSA) as a replacement for PSPs in Kubernetes 1.25+.
4. Network Policies:
- Implement network policies to control network communication between pods and services.
- Define rules that allow only necessary traffic between pods, restricting any unnecessary or unauthorized connections.
5. Secret Management
- Utilize Kubernetes Secrets to store sensitive information like passwords and API keys.
- Limit access to secrets based on the principle of least privilege.
- Avoid storing sensitive information directly in deployment YAML files.
NEW QUESTION # 43
You are managing a Kubernetes cluster running on AWS and need to assess the security configuration of the kubelet service against the CIS Kubernetes Benchmark v1 -7.1. You suspect that the '--cgroup-driver' flag is not properly configured, which could potentially expose the cluster to security vulnerabilities. Describe how you would use 'kubectl' to audit the current kubelet configuration and then determine the appropriate configuration tor the '-cgroup-driver' flag based on the CIS benchmark guidance. Assume that the kubelet service is running in a containerized environment.
Answer:
Explanation:
Solution (Step by Step) :
1. Audit the kubelet configuration:
- Execute the following command to retrieve the kubelet configuration:
bash
kubectl get nodes -o jsonpath='{.items0.status.nodelnfo.kubeletVersion}'
- This command will output the kubelet version, which can be used to identifry the specific version of the CIS Kubernetes Benchmark that applies.
- Use 'kubectl describe node to retrieve the kubelet configuration for the specific node.
2. Review the CIS Benchmark guidance:
- Refer to the CIS Kubernetes Benchmark v1 -7.1 document for the specific guidance on the '--cgroup-driver' flag. The benchmark typically recommends using a specific 'cgroup-driver' value depending on the Kubernetes version and the underlying operating systenm
- For example, on a Kubernetes cluster running on AWS, the CIS bencnmark may recommend using the 'systemd' cgroup driver.
3. Determine the current kubelet configuration:
- Check the output of 'kubectl describe node for the value of the flag.
- This will show you the current configuration of the '-cgroup-driver' flag for the kubelet
5. Update the kubelet configuratiom
- Update the kubelet configuration for each node in your cluster to reflect the CIS benchmark recommendation. This may involve editing the kubelet configuration file or using a tool such as kubeadm or kubectl to modify the kubelet configuration.
6. Verify the changes:
- Run the audit commands again to verify that the kubelet configuration has been updated as expected.
NEW QUESTION # 44
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