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Linux Foundation, which is a non-profit organization that promotes open-source software development, is responsible for the CKS Certification program. The Linux Foundation has a strong reputation in the open-source community for providing high-quality training and certification programs. The CKS certification program is one of the most respected and recognized certifications for Kubernetes security professionals. By obtaining the CKS certification, IT professionals can demonstrate their expertise in Kubernetes security and stand out in a competitive job market.
The Certified Kubernetes Security Specialist (CKS) certification exam is a new credential offered by the Linux Foundation. It is designed to test the knowledge and skills of professionals who are responsible for securing Kubernetes-based systems. Certified Kubernetes Security Specialist (CKS) certification is essential for individuals who seek to demonstrate their mastery of best practices in security and compliance within Kubernetes environments.
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Linux Foundation has recently announced the launch of a new certification exam โ the Certified Kubernetes Security Specialist (CKS). CKS Exam is designed to assess and validate the skills and knowledge of IT professionals who specialize in securing Kubernetes clusters.
NEW QUESTION # 50
You need to configure a Kubernetes cluster to use a pod security policy (PSP) that restricts the use of privileged containers and specific capabilities. You want to only allow specific pods in the 'production' namespace to run With the 'NET_ADMIN' capability.
Answer:
Explanation:
Solution (Step by Step) :
1. create a PSPI
- Define a PSP that restricts the use of privileged containers and capabilities, except for the capability for pods in the 'production' namespace.
2. Create a PSP Binding: - Bind the PSP to the 'production' namespace-
3. Create a Pod: - Create a Pod in the 'production' namespace and specify the 'securitycontext' with the 'NET_ADMIN' capability.
4. Apply the YAML files: - Apply the created YAML files using 'kubectl apply -f 5. Verify the permissions: - Try to create a Pod in other namespaces with the 'NET_ADMIN' capability. It should be rejected.
NEW QUESTION # 51
SIMULATION
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 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 5487
Answer:
Explanation:
FROM debian:latest
MAINTAINER k@bogotobogo.com
# 1 - RUN
RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -yq apt-utils RUN DEBIAN_FRONTEND=noninteractive apt-get install -yq htop RUN apt-get clean
# 2 - CMD
#CMD ["htop"]
#CMD ["ls", "-l"]
# 3 - WORKDIR and ENV
WORKDIR /root
ENV DZ version1
$ docker image build -t bogodevops/demo .
Sending build context to Docker daemon 3.072kB
Step 1/7 : FROM debian:latest
---> be2868bebaba
Step 2/7 : MAINTAINER k@bogotobogo.com
---> Using cache
---> e2eef476b3fd
Step 3/7 : RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -yq apt-utils
---> Using cache
---> 32fd044c1356
Step 4/7 : RUN DEBIAN_FRONTEND=noninteractive apt-get install -yq htop
---> Using cache
---> 0a5b514a209e
Step 5/7 : RUN apt-get clean
---> Using cache
---> 5d1578a47c17
Step 6/7 : WORKDIR /root
---> Using cache
---> 6b1c70e87675
Step 7/7 : ENV DZ version1
---> Using cache
---> cd195168c5c7
Successfully built cd195168c5c7
Successfully tagged bogodevops/demo:latest
NEW QUESTION # 52
SIMULATION
Context
You must implement auditing for the kubeadm provisioned cluster.
Task
First, reconfigure the cluster 's API server, so that:
. the basic audit policy located at
/etc/kubernetes/logpolicy/audit-policy.yaml is used,
. logs are stored at /var/log/kubernetes/audit-logs.txt,
. and a maximum of 2 logs are retained for 10 days.
The cluster uses the Docker Engine as its container runtime . If needed, use the docker command to troubleshoot running containers.
The basic policy only specifies what not to log.
Next, edit and extend the basic policy to log:
. namespaces interactions at RequestResponse level
. the request body of deployments interactions in the namespace webapps
. ConfigMap and Secret interactions in all namespaces at the Metadata level
. all other requests at the Metadata level
Make sure the API server uses the extended policy.
Failure to do so may result in a reduced score.
Answer:
Explanation:
See the Explanation below for complete solution
Explanation:
1) Connect to the correct host
ssh cks000028
sudo -i
(If hostname differs in your exam, use the one shown in the question banner.)
2) Edit the API server static pod manifest
API server is a static pod in kubeadm.
vi /etc/kubernetes/manifests/kube-apiserver.yaml
3) Configure API server to enable auditing
Inside the command: section, ensure ALL of the following flags exist
(add them if missing, modify if present).
3.1 Use the given audit policy file
- --audit-policy-file=/etc/kubernetes/logpolicy/audit-policy.yaml
3.2 Store audit logs at the required location
- --audit-log-path=/var/log/kubernetes/audit-logs.txt
3.3 Retain a maximum of 2 log files
- --audit-log-maxbackup=2
3.4 Retain logs for 10 days
- --audit-log-maxage=10
โ
Example (your file may have more flags - that's fine):
- command:
- kube-apiserver
- --audit-policy-file=/etc/kubernetes/logpolicy/audit-policy.yaml
- --audit-log-path=/var/log/kubernetes/audit-logs.txt
- --audit-log-maxbackup=2
- --audit-log-maxage=10
Save and exit:
:wq
The API server will auto-restart (static pod).
Optional quick check:
docker ps | grep kube-apiserver
4) Edit and EXTEND the audit policy
Open the given basic policy:
vi /etc/kubernetes/logpolicy/audit-policy.yaml
The file already contains rules for what NOT to log.
You must ADD rules BELOW them (do not delete existing ones).
5) Add the required audit rules (EXACT ORDER)
Append the following rules in this order (order matters in audit policies).
5.1 Log namespaces interactions at RequestResponse
- level: RequestResponse
resources:
- group: ""
resources: ["namespaces"]
5.2 Log deployment request bodies in namespace webapps
- level: RequestResponse
namespaces: ["webapps"]
resources:
- group: "apps"
resources: ["deployments"]
5.3 Log ConfigMap and Secret interactions (all namespaces) at Metadata
- level: Metadata
resources:
- group: ""
resources: ["configmaps", "secrets"]
5.4 Log all other requests at Metadata
This must be LAST
- level: Metadata
5.5 Final audit-policy.yaml should END like this
# (existing "do not log" rules above)
- level: RequestResponse
resources:
- group: ""
resources: ["namespaces"]
- level: RequestResponse
namespaces: ["webapps"]
resources:
- group: "apps"
resources: ["deployments"]
- level: Metadata
resources:
- group: ""
resources: ["configmaps", "secrets"]
- level: Metadata
Save and exit:
:wq
6) Make sure API server uses the EXTENDED policy
Touch the manifest to guarantee reload:
touch /etc/kubernetes/manifests/kube-apiserver.yaml
Wait a few seconds.
7) Verify auditing is working
7.1 Check audit log file exists
ls -l /var/log/kubernetes/audit-logs.txt
7.2 Generate test activity
kubectl get namespaces
kubectl get configmaps -A
7.3 Confirm logs are written
tail -n 20 /var/log/kubernetes/audit-logs.txt
You should see audit entries.
NEW QUESTION # 53
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:
Answer:
Explanation:
apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
name: restricted
annotations:
seccomp.security.alpha.kubernetes.io/allowedProfileNames: 'docker/default,runtime/default' apparmor.security.beta.kubernetes.io/allowedProfileNames: 'runtime/default' seccomp.security.alpha.kubernetes.io/defaultProfileName: 'runtime/default' apparmor.security.beta.kubernetes.io/defaultProfileName: 'runtime/default' spec:
privileged: false
# Required to prevent escalations to root.
allowPrivilegeEscalation: false
# This is redundant with non-root + disallow privilege escalation,
# but we can provide it for defense in depth.
requiredDropCapabilities:
- ALL
# Allow core volume types.
volumes:
- 'configMap'
- 'emptyDir'
- 'projected'
- 'secret'
- 'downwardAPI'
# Assume that persistentVolumes set up by the cluster admin are safe to use.
- 'persistentVolumeClaim'
hostNetwork: false
hostIPC: false
hostPID: false
runAsUser:
# Require the container to run without root privileges.
rule: 'MustRunAsNonRoot'
seLinux:
# This policy assumes the nodes are using AppArmor rather than SELinux.
rule: 'RunAsAny'
supplementalGroups:
rule: 'MustRunAs'
ranges:
# Forbid adding the root group.
- min: 1
max: 65535
fsGroup:
rule: 'MustRunAs'
ranges:
# Forbid adding the root group.
- min: 1
max: 65535
readOnlyRootFilesystem: false
NEW QUESTION # 54
You're working on a Kubernetes cluster where container images are pulled from a private registry. Security best practices dictate that you should configure the cluster to only allow image pulls from authorized registries. Explain how you would enforce this policy using image admission controllers and provide a practical example of an admission control configuration.
Answer:
Explanation:
Solution (Step by Step) :
1. Enable Image Admission Controller:
- Install the Admission Controller. The 'ImagePolicyWebhook' admission controller enforces policies on container images. You can install it as part of your Kubernetes deployment or using a Helm chart.
2. Create a Policy Configuration:
- Define the Policy: Use a YAML file to define the rules for the admission controller. This policy will specify the allowed registries.
- Example Policy Configuration:
3. Configure the Service: - Create a Service: Create a Kubernetes service that exposes the admission controllers endpoint. - Example Service Configuration:
4. Deploy the Policy Engine: - Create a Deployment: Create a Kubernetes deployment to run the policy engine (e.g., a container image with the admission controller logic). - Example Deployment Configuration:
5. Verify the Configuration: - Test Image Pulls: Attempt to pull images from both authorized and unauthorized registries. - Monitor tor Policy Enforcement: Observe the admission controllers logs to confirm that it iS successtully blocking pulls from unauthorized registries. - Validate Security: Ensure that the policy effectively prevents the use of unauthorized container image sources, enhancing the clusters security posture.
NEW QUESTION # 55
......
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