Linux-Foundation CKS Exam Dumps

Certified Kubernetes Security Specialist (CKS)

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Linux-Foundation CKS Sample Questions

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 

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 

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

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. 

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. 

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 

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

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

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

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.

You can switch the cluster/configuration context using the following command: [desk@cli] $ kubectl config use-context test-account Task: 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 5 days 3. at maximum, a number of 10 old audit log files are retained A basic policy is provided at /etc/Kubernetes/logpolicy/audit-policy.yaml. It only specifies what not to log. Note: The base policy is located on the cluster's master node. Edit and extend the basic policy to log: 1. Nodes changes at RequestResponse level 2. The request body of persistentvolumes changes in the namespace frontend 3. ConfigMap and Secret changes in all namespaces at the Metadata level Also, add a catch-all rule to log all other requests at the Metadata leve Note: Don't forget to apply the modified policy.

Create a PSP that will prevent the creation of privileged pods in the namespace. Create a new PodSecurityPolicy named prevent-privileged-policy which prevents the creation of privileged pods. Create a new ServiceAccount named psp-sa in the namespace default. Create a new ClusterRole named prevent-role, which uses the newly created Pod Security Policy prevent-privileged-policy. Create a new ClusterRoleBinding named prevent-role-binding, which binds the created ClusterRole prevent-role to the created SA psp-sa. Also, Check the Configuration is working or not by trying to Create a Privileged pod, it should get failed. 

a. Retrieve the content of the existing secret named default-token-xxxxx in the testing namespace. Store the value of the token in the token.txt b. Create a new secret named test-db-secret in the DB namespace with the following content: username: mysql password: password@123 Create the Pod name test-db-pod of image nginx in the namespace db that can access test-db-secret via a volume at path /etc/mysql-credentials

Create a new NetworkPolicy named deny-all in the namespace testing which denies all traffic of type ingress and egress traffic

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: 

You can switch the cluster/configuration context using the following command: [desk@cli] $ kubectl config use-context dev A default-deny NetworkPolicy avoid to accidentally expose a Pod in a namespace that doesn't have any other NetworkPolicy defined. Task: Create a new default-deny NetworkPolicy named deny-network in the namespace test for all traffic of type Ingress + Egress The new NetworkPolicy must deny all Ingress + Egress traffic in the namespace test. Apply the newly created default-deny NetworkPolicy to all Pods running in namespace test. You can find a skeleton manifests file at /home/cert_masters/network-policy.yaml

Using the runtime detection tool Falco, Analyse the container behavior for at least 20 seconds, using filters that detect newly spawning and executing processes in a single container of Nginx. store the incident file art /opt/falco-incident.txt, containing the detected incidents. one per line, in the format [timestamp],[uid],[processName]

Fix all issues via configuration and restart the affected components to ensure the new setting takes effect. Fix all of the following violations that were found against the API server:- a. Ensure that the RotateKubeletServerCertificate argument is set to true. b. Ensure that the admission control plugin PodSecurityPolicy is set. c. Ensure that the --kubelet-certificate-authority argument is set as appropriate. Fix all of the following violations that were found against the Kubelet:- a. Ensure the --anonymous-auth argument is set to false. b. Ensure that the --authorization-mode argument is set to Webhook. Fix all of the following violations that were found against the ETCD:- a. Ensure that the --auto-tls argument is not set to true b. Ensure that the --peer-auto-tls argument is not set to true Hint: Take the use of Tool Kube-Bench

Create a network policy named allow-np, that allows pod in the namespace staging to connect to port 80 of other pods in the same namespace. Ensure that Network Policy:- 1. Does not allow access to pod not listening on port 80. 2. Does not allow access from Pods, not in namespace staging

Create a new ServiceAccount named backend-sa in the existing namespace default, which has the capability to list the pods inside the namespace default. Create a new Pod named backend-pod in the namespace default, mount the newly created sa backend-sa to the pod, and Verify that the pod is able to list pods. Ensure that the Pod is running.

Create a Pod name Nginx-pod inside the namespace testing, Create a service for the Nginx-pod named nginx-svc, using the ingress of your choice, run the ingress on tls, secure port.