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Linux Foundation CKS certification is an advanced-level certification for Kubernetes administrators who want to demonstrate their expertise in securing container-based applications and Kubernetes platforms. It is a performance-based exam that evaluates the candidate's ability to secure a Kubernetes cluster using industry best practices. Obtaining the CKS certification can help you stand out in a competitive job market and demonstrate your commitment to staying up-to-date with the latest Kubernetes security trends and best practices.
The CKS Certification Exam is a valuable credential for IT professionals who are responsible for securing Kubernetes platforms. CKS exam validates the candidate's knowledge and skills in Kubernetes security, which is essential in today's rapidly evolving IT landscape. Certified Kubernetes Security Specialist (CKS) certification demonstrates to employers and organizations that the candidate has the expertise to secure Kubernetes clusters and protect them against common security threats and vulnerabilities.
Linux Foundation Certified Kubernetes Security Specialist (CKS) Sample Questions (Q82-Q87):
NEW QUESTION # 82
Given an existing Pod named nginx-pod running in the namespace test-system, fetch the service-account-name used and put the content in /candidate/KSC00124.txt Create a new Role named dev-test-role in the namespace test-system, which can perform update operations, on resources of type namespaces.
Answer: A
NEW QUESTION # 83
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.
Answer: A
NEW QUESTION # 84
You have a Kubernetes cluster running a highly sensitive microservices application. You need to implement a strict security policy wnere only pods with specific labels can communicate with each other within the same namespace. How can you achieve this using NetworkPolicies?
Answer:
Explanation:
Solution (Step by Step) :
1. Define Label-Based Access: Identify the specific labels tnat pods within tne namespace Should have to allow communication. For example, let'S say pods with the labels Sapp: serviceAS and Sapp: serviceB' should be allowed to communicate, but other pods should be isolated.
2. Create NetworkPolicy: Create a NetworkPolicy YAML file named 'strict-communication.yaml to define the communication policy:
- This policy allows pods with the labels 'app: serviceA' or Sapp: serviced' to communicate witn each other. Other pods Within the same namespace are not allowed to communicate. 3. Apply Network Policy: Apply the NetworkPolicy using 'kubectr: bash kubectl apply -f strict-communication.yaml 4. Verify Network Policy: Verify the NetworkPolicy is applied: bash kubectl get networkpolicies -n 5. Test Access: Test communication between pods within the namespace. Pods with the specified labels Capp: serviceAS and Sapp: serviceB') should be able to communicate. Other pods should not be able to communicate with each other or with the labeled pods. This NetworkPolicy enforces a strict communication policy within the namespace. It restricts communication to pods with specific labels, effectively isolating other pods within the same namespace. This policy can be tuner customized to define more granular communication rules based on labels and other pod attributes.
NEW QUESTION # 85
You can switch the cluster/configuration context using the following command: [desk@cli] $ kubectl config use-context dev Context: A CIS Benchmark tool was run against the kubeadm created cluster and found multiple issues that must be addressed. 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: 1.2.7 authorization-mode argument is not set to AlwaysAllow FAIL 1.2.8 authorization-mode argument includes Node FAIL 1.2.7 authorization-mode argument includes RBAC FAIL Fix all of the following violations that were found against the Kubelet: 4.2.1 Ensure that the anonymous-auth argument is set to false FAIL 4.2.2 authorization-mode argument is not set to AlwaysAllow FAIL (Use Webhook autumn/authz where possible) Fix all of the following violations that were found against etcd: 2.2 Ensure that the client-cert-auth argument is set to true
Answer:
Explanation:
worker1 $ vim /var/lib/kubelet/config.yaml
anonymous:
enabled: true #Delete this
enabled: false #Replace by this
authorization:
mode: AlwaysAllow #Delete this
mode: Webhook #Replace by this
worker1 $ systemctl restart kubelet. # To reload kubelet config ssh to master1 master1 $ vim /etc/kubernetes/manifests/kube-apiserver.yaml - -- authorization-mode=Node,RBAC master1 $ vim /etc/kubernetes/manifests/etcd.yaml - --client-cert-auth=true Explanation ssh to worker1 worker1 $ vim /var/lib/kubelet/config.yaml apiVersion: kubelet.config.k8s.io/v1beta1 authentication:
anonymous:
enabled: true #Delete this
enabled: false #Replace by this
webhook:
cacheTTL: 0s
enabled: true
x509:
clientCAFile: /etc/kubernetes/pki/ca.crt
authorization:
mode: AlwaysAllow #Delete this
mode: Webhook #Replace by this
webhook:
cacheAuthorizedTTL: 0s
cacheUnauthorizedTTL: 0s
cgroupDriver: systemd
clusterDNS:
- 10.96.0.10
clusterDomain: cluster.local
cpuManagerReconcilePeriod: 0s
evictionPressureTransitionPeriod: 0s
fileCheckFrequency: 0s
healthzBindAddress: 127.0.0.1
healthzPort: 10248
httpCheckFrequency: 0s
imageMinimumGCAge: 0s
kind: KubeletConfiguration
logging: {}
nodeStatusReportFrequency: 0s
nodeStatusUpdateFrequency: 0s
resolvConf: /run/systemd/resolve/resolv.conf
rotateCertificates: true
runtimeRequestTimeout: 0s
staticPodPath: /etc/kubernetes/manifests
streamingConnectionIdleTimeout: 0s
syncFrequency: 0s
volumeStatsAggPeriod: 0s
worker1 $ systemctl restart kubelet. # To reload kubelet config ssh to master1 master1 $ vim /etc/kubernetes/manifests/kube-apiserver.yaml
master1 $ vim /etc/kubernetes/manifests/etcd.yaml
NEW QUESTION # 86
Your Kubernetes cluster is configured with a default service account with broad permissions. You need to disable this default service account to enhance security and limit access to cluster resources.
Answer:
Explanation:
Solution (Step by Step):
1. Identify Default Service Account:
- Use the command 'kubectl get serviceaccount -n default default to identify the default service account in the default namespace.
2. Remove Default Service Account:
- You need to remove the default service account using the command 'kubectl delete serviceaccount default -n default
3. Review Permissions Check your RBAC configuration and ensure that no other roles or bindings grant unnecessary permissions to any other service accounts.
4. Create Custom Service Accounts: Create new, dedicated service accounts for each application or component that requires access to the cluster.
Assign specific roles or permissions to each service account based on its requirements.
Note: This process may require changes to your applications or configurations to use the new, dedicated service accounts instead of the default service account.
NEW QUESTION # 87
......
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