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The CKS certification exam is a valuable credential for professionals seeking to advance their career in the field of Kubernetes security. With the growing popularity of Kubernetes, the demand for professionals with CKS Certification is increasing rapidly. By passing the exam, individuals can demonstrate their expertise in securing Kubernetes-based applications and infrastructure, making them a valuable asset to any organization.
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The CKS Certification is vendor-neutral, which means that it is not tied to any specific technology or vendor. This enables IT professionals to demonstrate their competence in Kubernetes security, regardless of the tools or platforms they use. CKS exam covers a broad range of topics, including Kubernetes architecture and components, security best practices, network security, cluster hardening, and monitoring and logging. Successful candidates will be able to identify and mitigate security risks and vulnerabilities in Kubernetes environments.
NEW QUESTION # 59
SIMULATION
Documentation dockerd
You must connect to the correct host . Failure to do so may result in a zero score.
[candidate@base] $ ssh cks000037
Task
Perform the following tasks to secure the cluster node cks000037 :
Remove user developer from the docker group.
Do not remove the user from any other group.
Reconfigure and restart the Docker daemon to ensure that the socket
file located at /var/run/docker.sock is owned by the group root.
Re-configure and restart the Docker daemon to ensure it does not listen on any TCP port.
After completing your work, ensure the Kubernetes cluster is healthy.
Answer:
Explanation:
See the Explanation below for complete solution
Explanation:
1) Connect to the correct host
ssh cks000037
sudo -i
2) Remove user developer from the docker group ONLY
2.1 Verify current groups (optional but fast)
id developer
2.2 Remove ONLY from docker group
gpasswd -d developer docker
2.3 Verify removal
id developer
✅ docker should not appear; other groups must remain.
3) Reconfigure Docker to secure the socket and disable TCP
Docker config file:
vi /etc/docker/daemon.json
3.1 Set socket group to root and disable TCP listeners
Ensure the file contains exactly these relevant settings (merge with existing JSON if present):
{
"group": "root",
"hosts": ["unix:///var/run/docker.sock"]
}
Important:
"group": "root" → docker.sock owned by group root
"hosts" includes ONLY the unix socket (no tcp://)
If the file already exists with other keys, add/adjust only these keys and keep valid JSON (commas!).
Save and exit:
:wq
4) Restart Docker daemon
systemctl daemon-reload
systemctl restart docker
systemctl status docker --no-pager
5) Verify Docker socket ownership and permissions
ls -l /var/run/docker.sock
Expected:
srw-rw---- 1 root root ...
✅ Owner: root
✅ Group: root
6) Verify Docker is NOT listening on TCP
ss -lntp | grep docker
Expected:
No output (or nothing bound to TCP by dockerd)
Optional double-check:
ps aux | grep dockerd | grep -v grep
Ensure no -H tcp://... flags.
7) Ensure Kubernetes cluster is healthy
7.1 Check node and pods
export KUBECONFIG=/etc/kubernetes/admin.conf
kubectl get nodes
kubectl get pods -A
All nodes should be Ready, core pods Running.
NEW QUESTION # 60
SIMULATION
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:
See the Explanation below
Explanation:
NEW QUESTION # 61
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
Answer: B
NEW QUESTION # 62
Secrets stored in the etcd is not secure at rest, you can use the etcdctl command utility to find the secret value for e.g:-
Answer: A
Explanation:
Output
Using the Encryption Configuration, Create the manifest, which secures the resource secrets using the provider AES-CBC and identity, to encrypt the secret-data at rest and ensure all secrets are encrypted with the new configuration.
NEW QUESTION # 63
SIMULATION
Before Making any changes build the Dockerfile with tag base:v1
Now Analyze and edit the given Dockerfile(based on ubuntu 16:04)
Fixing two instructions present in the file, Check from Security Aspect and Reduce Size point of view.
Dockerfile:
FROM ubuntu:latest
RUN apt-get update -y
RUN apt install nginx -y
COPY entrypoint.sh /
RUN useradd ubuntu
ENTRYPOINT ["/entrypoint.sh"]
USER ubuntu
entrypoint.sh
#!/bin/bash
echo "Hello from CKS"
After fixing the Dockerfile, build the docker-image with the tag base:v2 To Verify: Check the size of the image before and after the build.
Answer: A
NEW QUESTION # 64
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