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The CKS exam is intended for experienced Kubernetes administrators and security professionals who are responsible for securing Kubernetes environments. CKS exam covers a broad range of topics, including Kubernetes cluster setup, authentication and authorization, network security, storage security, and container security. Candidates will be tested on their ability to identify and mitigate security risks, implement security policies, configure security features, and audit Kubernetes environments. Passing the CKS Exam requires a deep understanding of Kubernetes security principles and practices, as well as hands-on experience in securing Kubernetes environments.
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The Linux Foundation CKS exam is designed to be challenging and requires a high level of expertise and experience in Kubernetes security. Candidates are required to demonstrate their knowledge and skills in a variety of areas, including Kubernetes network security, authentication and authorization, container security, and Kubernetes security tools.
NEW QUESTION # 34
You have a Kubernetes cluster with a custom admission controller that enforces certain security policies. You need to write a script that can be used to test the functionality of the admission controller by creating a Pod With specific properties that should be rejected by the controller.
Answer:
Explanation:
Solution (Step by Step) :
1. Define tne admission controller policy:
- Assume the admission controller is configured to reject Pods that are not running in a specific namespace, like 'secure-namespace
2. Create a test Pod YAML file:
3. Write a Python script to create the Pod and check the result
4. Run the script: - Save the script as . - Execute the script using 'python test _ admission_controller.py' 5. Verify the results: - You should see the output indicating that the pod creation was rejected by the admission controller.
NEW QUESTION # 35
SIMULATION
Documentation Ingress, Service, NGINX Ingress Controller
You must connect to the correct host . Failure to do so may result in a zero score.
[candidate@base] $ ssh cks000032
Context
You must expose a web application using HTTPS routes.
Task
Create an Ingress resource named web in the prod namespace and configure it as follows:
. Route traffic for host web.k8s.local and all paths to the existing Service web
. Enable TLS termination using the existing Secret web-cert.
. Redirect HTTP requests to HTTPS .
You can test your Ingress configuration with the following command:
[candidate@cks000032]$ curl -L http://web.k8s.local
Answer:
Explanation:
See the Explanation below for complete solution
Explanation:
1) Connect to the correct host
ssh cks000032
sudo -i
2) Use admin kubeconfig
export KUBECONFIG=/etc/kubernetes/admin.conf
3) Verify prerequisites (quick check)
These should already exist per task.
kubectl -n prod get svc web
kubectl -n prod get secret web-cert
kubectl get pods -n ingress-nginx
(If the ingress controller pods exist, you're good.)
4) Create the Ingress resource
Create Ingress named web in namespace prod with:
host: web.k8s.local
all paths → Service web
TLS using Secret web-cert
HTTP → HTTPS redirect (NGINX)
cat <<EOF | kubectl apply -f -
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: web
namespace: prod
annotations:
nginx.ingress.kubernetes.io/ssl-redirect: "true"
nginx.ingress.kubernetes.io/force-ssl-redirect: "true"
spec:
ingressClassName: nginx
tls:
- hosts:
- web.k8s.local
secretName: web-cert
rules:
- host: web.k8s.local
http:
paths:
- path: /
pathType: Prefix
backend:
service:
name: web
port:
number: 80
EOF
5) Verify Ingress creation
kubectl -n prod get ingress web
kubectl -n prod describe ingress web
Confirm:
Host = web.k8s.local
TLS Secret = web-cert
Backend Service = web
6) Test HTTP → HTTPS redirect
curl -L http://web.k8s.local
Expected:
Redirects to https://web.k8s.local
Returns application response over HTTPS
NEW QUESTION # 36
Explain the concept of Software Bill of Materials (SBOM) in the context of Kubernetes supply chain security How does an SBOM help in strengthening security practices for applications running in a Kubernetes environment?
Answer:
Explanation:
Solution (Step by Step) :
An SBOM, or Software Bill of Materials, is a detailed inventory of components used in a software product. In the context of Kubernetes, an SBOM can be used to:
Inventory Management The SBOM provides a comprehensive list of all software components, including their versions, licenses, and dependencies.
This allows for better inventory management and understanding of the entire software stack.
Vulnerability Identificatiom By comparing the S80M with known vulnerability databases, security teams can quickly identity any vulnerable components in the application- This helps in proactively addressing vulnerabilities before they are exploited.
Compliance Auditing: The SBOM provides documentation that can be used to demonstrate compliance with various security regulations and industry standards, such as NIST, ISO 27001, or GDPR.
Supply Chain Traceability: The SBOM helps track the origin and lineage of software components, enabling better understanding of potential risks associated with third-patty software.
Effective Patching: The SBOM facilitates the identification and patching of vulnerable components by providing clear information about the affected components and their versions.
NEW QUESTION # 37
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:
Answer:
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
NEW QUESTION # 38
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 # 39
......
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