Linux-Foundation CKS Practice Exam Questions

Linux-Foundation CKS Sample Question Answers

Question # 1

use the Trivy to scan the following images, 1. amazonlinux:1 2. k8s.gcr.io/kube-controller-manager:v1.18.6 Look for images with HIGH or CRITICAL severity vulnerabilities and store the output of the same in /opt/trivy-vulnerable.txt 

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Question # 2

Enable audit logs in the cluster, To Do so, enable the log backend, and ensure that 1. logs are stored at /var/log/kubernetes-logs.txt. 2. Log files are retained for 12 days. 3. at maximum, a number of 8 old audit logs files are retained. 4. set the maximum size before getting rotated to 200MB Edit and extend the basic policy to log: 1. namespaces changes at RequestResponse 2. Log the request body of secrets changes in the namespace kube-system. Question No : 46 CORRECT TEXT Linux Foundation CKS : Practice Test 130 3. Log all other resources in core and extensions at the Request level. 4. Log "pods/portforward", "services/proxy" at Metadata level. 5. Omit the Stage RequestReceived All other requests at the Metadata level 

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Question # 3

Create a RuntimeClass named gvisor-rc using the prepared runtime handler named runsc. Create a Pods of image Nginx in the Namespace server to run on the gVisor runtime class

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Question # 4

You must complete this task on the following cluster/nodes: Cluster: trace Question No : 40 CORRECT TEXT Linux Foundation CKS : Practice Test 111 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. 

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Question # 5

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. 

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Question # 6

Use the kubesec docker images to scan the given YAML manifest, edit and apply the advised changes, and passed with a score of 4 points. kubesec-test.yaml apiVersion: v1 kind: Pod metadata: name: kubesec-demo Question No : 38 CORRECT TEXT Linux Foundation CKS : Practice Test 108 spec: containers: - name: kubesec-demo image: gcr.io/google-samples/node-hello:1.0 securityContext: readOnlyRootFilesystem: true Hint: docker run -i kubesec/kubesec:512c5e0 scan /dev/stdin < kubesec-test.yaml 

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Question # 7

Analyze and edit the given Dockerfile FROM ubuntu:latest RUN apt-get update -y RUN apt-install nginx -y COPY entrypoint.sh / ENTRYPOINT ["/entrypoint.sh"] USER ROOT Fixing two instructions present in the file being prominent security best practice issues Analyze and edit the deployment manifest file apiVersion: v1 Question No : 36 CORRECT TEXT Linux Foundation CKS : Practice Test 101 kind: Pod metadata: name: security-context-demo-2 spec: securityContext: runAsUser: 1000 containers: - name: sec-ctx-demo-2 image: gcr.io/google-samples/node-hello:1.0 securityContext: runAsUser: 0 privileged: True allowPrivilegeEscalation: false Fixing two fields present in the file being prominent security best practice issues Don't add or remove configuration settings; only modify the existing configuration settings Whenever you need an unprivileged user for any of the tasks, use user test-user with the user id 548

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Question # 8

You can switch the cluster/configuration context using the following command: [desk@cli] $ kubectl config use-context stage Context: A PodSecurityPolicy shall prevent the creation of privileged Pods in a specific namespace. Task: 1. Create a new PodSecurityPolcy named deny-policy, which prevents the creation of privileged Pods. 2. Create a new ClusterRole name deny-access-role, which uses the newly created PodSecurityPolicy deny-policy. 3. Create a new ServiceAccount named psd-denial-sa in the existing namespace development. Finally, create a new ClusterRoleBindind named restrict-access-bind, which binds the Question No : 32 CORRECT TEXT Linux Foundation CKS : Practice Test 90 newly created ClusterRole deny-access-role to the newly created ServiceAccount pspdenial-sa

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Question # 9

You can switch the cluster/configuration context using the following command: [desk@cli] $ kubectl config use-context qa Context: A pod fails to run because of an incorrectly specified ServiceAccount Task: Question No : 30 CORRECT TEXT Linux Foundation CKS : Practice Test 85 Create a new service account named backend-qa in an existing namespace qa, which must not have access to any secret. Edit the frontend pod yaml to use backend-qa service account Note: You can find the frontend pod yaml at /home/cert_masters/frontend-pod.yaml

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Question # 10

Service is running on port 389 inside the system, find the process-id of the process, and stores the names of all the open-files inside the /candidate/KH77539/files.txt, and also delete the binary.

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