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CKS Practice Engine & CKS Vce Study Material & CKS Online Test Engine
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Linux Foundation Certified Kubernetes Security Specialist (CKS) Sample Questions (Q48-Q53):NEW QUESTION # 48
SIMULATION
Create a User named john, create the CSR Request, fetch the certificate of the user after approving it.
Create a Role name john-role to list secrets, pods in namespace john
Finally, Create a RoleBinding named john-role-binding to attach the newly created role john-role to the user john in the namespace john. To Verify: Use the kubectl auth CLI command to verify the permissions.
Answer:
Explanation:
se kubectl to create a CSR and approve it.
Get the list of CSRs:
kubectl get csr
Approve the CSR:
kubectl certificate approve myuser
Get the certificate
Retrieve the certificate from the CSR:
kubectl get csr/myuser -o yaml
here are the role and role-binding to give john permission to create NEW_CRD resource:
kubectl apply -f roleBindingJohn.yaml --as=john
rolebinding.rbac.authorization.k8s.io/john_external-rosource-rb created kind: RoleBinding apiVersion: rbac.authorization.k8s.io/v1 metadata:
name: john_crd
namespace: development-john
subjects:
- kind: User
name: john
apiGroup: rbac.authorization.k8s.io
roleRef:
kind: ClusterRole
name: crd-creation
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: crd-creation
rules:
- apiGroups: ["kubernetes-client.io/v1"]
resources: ["NEW_CRD"]
verbs: ["create, list, get"]
NEW QUESTION # 49
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:
NEW QUESTION # 50
You are running a critical application within a Kubernetes cluster. Your application relies on a base image with several unnecessary packages installed. These packages increase the attack surface of your application and make it more vulnerable to exploits. You want to minimize the base image footprint to enhance the security posture of your application. Explain how you can achieve this in a production environment.
Answer:
Explanation:
Solution (Step by Step) :
1. Identify unnecessary Packages:
- Use tools like 'alpine-pkg-info' or 'dpkg -l' to list installed packages within the base image.
- Analyze the package list to identify packages that are not strictly required for your application's functionality.
- Example: If you are running a Node.js application, you might identity development tools like 'gcc' or 'make' as unnecessary.
2. Create a Custom Base Image:
- Docker-file: Start by creating a Dockefflle that inherits from a minimal base image like 'alpine:latest or 'ubuntu:latest' (depending on your application's requirements).
- Install Essential Packages: Include only the absolutely necessary packages for your application in the Dockerfile. Use the 'apt-get install' (for Debian/lJbuntu) or 'apk add' (for Alpine) commands to install these packages.
- Example Dockerfile:
FROM alpine:latest
# Install necessary packages
RIJN apk add --no-cache bash openssl curl nodejs npm
# Copy your application code
COPY _ /app
# Set working directory and execute start script
WORKDIR 'app
CMD ["npm", "start"]
3. Test the Custom Image:
- Build the custom image using 'docker build -t custom-base-image
- Create a container from the custom image and run your application to ensure everything works correctly. This step is critical to catch any compatibility issues before deploying to your Kubernetes cluster.
4. Update Your Deployments:
- Modify your Deployment YAML files to use the custom base image instead of the original image. Update the 'image' field to reference the custom base image tag.
- Example:
5. Deploy the Updated Application: - Use 'kubectl apply -f deployment_yaml to update your deployment with the new image- - Monitor the deployment to ensure a successful rollout with your minimal base image. 6. Regular - Periodically review your application's requirements and ensure that the base image still meets your needs. -As you add new features or update dependencies, you might need to add additional packages to the base image. - Keep the image as minimal as possible and use the least-privilege principle when selecting packages.
NEW QUESTION # 51
SIMULATION
Context
You must resolve issues that a CIS Benchmark tool found for the kubeadm provisioned cluster.
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 kubelet:
The cluster uses the Docker Engine os its container runtime, If needed, use the docker command to troubleshaot running containers.
Ensure that the anonymous-auth argument is set to false FAIL
Ensure that the -authorization-mode argument is not set to FAIL
AlwaysAllow
Use Webhook authentication /authorization where possible.
Fix all of the following violations that were found against ettd :
Ensure that the -client cert auth argument is set to true FAIL
Answer:
Explanation:
See the Explanation below for complete solution
Explanation:
1) SSH to the right node
ssh cks000002
sudo -i
2) Fix kubelet CIS findings
2.1 Edit kubelet config (MAIN place in kubeadm clusters)
vi /var/lib/kubelet/config.yaml
A) Set anonymous-auth to false
Find (or add) this block exactly:
authentication:
anonymous:
enabled: false
B) Use Webhook authentication (recommended by task)
Ensure this exists under authentication:
webhook:
enabled: true
C) Use Webhook authorization and NOT AlwaysAllow
Find (or add) this block exactly:
authorization:
mode: Webhook
When done, your file should contain something like this (exact structure to aim for):
authentication:
anonymous:
enabled: false
webhook:
enabled: true
x509:
clientCAFile: /etc/kubernetes/pki/ca.crt
authorization:
mode: Webhook
If x509: section isn't there, it's usually already present in kubeadm; don't panic. Only the task-required parts are: anonymous false + webhook enabled + authorization mode Webhook.
2.2 Restart kubelet (required for config.yaml changes)
systemctl daemon-reload
systemctl restart kubelet
systemctl status kubelet --no-pager
Quick confirm (optional but fast):
grep -nE "anonymous|webhook|authorization|mode" /var/lib/kubelet/config.yaml
3) Fix etcd CIS finding: --client-cert-auth=true
3.1 Edit etcd static pod manifest (kubeadm path)
vi /etc/kubernetes/manifests/etcd.yaml
Find the container command: args that look like:
- command:
- etcd
- --something=...
Ensure this line exists exactly in the list:
- --client-cert-auth=true
Also ensure this is present (usually already is, but add if missing):
- --trusted-ca-file=/etc/kubernetes/pki/etcd/ca.crt
Example snippet (what you want the args area to include):
- command:
- etcd
- --client-cert-auth=true
- --trusted-ca-file=/etc/kubernetes/pki/etcd/ca.crt
3.2 Apply etcd change (auto-restart happens)
Just save the file. Kubelet will restart etcd automatically.
Watch it restart (pick one depending on runtime):
If Docker runtime (your task mentions Docker):
docker ps | grep etcd
If you don't see it briefly, wait 2-5 seconds and rerun:
docker ps | grep etcd
(Alternative if available)
crictl ps | grep etcd
4) Final quick validation (fast exam check)
Kubelet config check
grep -n "enabled: false" -n /var/lib/kubelet/config.yaml | head
grep -n "webhook" /var/lib/kubelet/config.yaml
grep -n "authorization" /var/lib/kubelet/config.yaml
etcd arg check
grep -n "client-cert-auth" /etc/kubernetes/manifests/etcd.yaml
NEW QUESTION # 52
You are responsible for securing the Kubernetes clusters supply chain. You want to ensure that only images from trusted registries are allowed to be deployed to the cluster. How would you configure Kubernetes to restrict deployments to only images from specific registries?
Answer:
Explanation:
Solution (Step by Step) :
1. Create a Pod Security Policy (PSP):
- A PSP is a policy that enforces security restrictions on pods. You can define the allowed registries for image pulls within the PSP
- 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 # 53
......
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