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With each passing year, there's a slight change in the format of CKS exam. ExamsReviews has put in a lot of effort in bringing to you the latest CKS questions, all by the current exam standards set by the Linux Foundation. All the Certified Kubernetes Security Specialist (CKS) (CKS) questions have been thoroughly checked to check their validity and to make sure we provide our candidates with the updated exam content.
| Section | Weight | Objectives |
|---|---|---|
| Monitoring, Logging and Runtime Security | 20% | - Audit log configuration - Threat detection (Falco) - Incident investigation - Container immutability - Behavioral analytics |
| Cluster Setup | 15% | - CIS benchmark compliance - Binary verification - Node metadata protection - Secure Ingress configuration - Network security policies |
| Minimize Microservice Vulnerabilities | 20% | - Pod Security Standards - Secret management - Isolation & multi-tenancy - Security contexts - OPA/Gatekeeper implementation |
| Cluster Hardening | 15% | - API access restriction - Service account security - Component updates & vulnerability mitigation - RBAC configuration |
| Supply Chain Security | 20% | - Static analysis tools - Permitted registries - Signed artifacts & verification - SBOM & CI/CD security - Image security & scanning |
| System Hardening | 10% | - Kernel hardening (AppArmor, seccomp) - Least privilege IAM - Minimize OS attack surface - Network access control |
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NEW QUESTION # 37
You are managing a Kubernetes cluster running an application that uses a private container registry. The registry is secured using basic authentication, but the credentials are stored in a secret in the cluster. You want to ensure that the application container can access the registry without storing the credentials directly within the container image.
How would you configure the application deployment to access the private registry securely without exposing the credentials?
Answer:
Explanation:
Solution (Step by Step) :
1. Create a Secret:
- Create a secret that stores the registry username and password.
- Example:
2. Configure the Service Account - Create a service account tor the application. - Add the 'imagePullSecrets' field to the service account to reference the secret. - Example:
3. Update the Deployment: - Update the deployment YAML to use the service account. - Example:
4. Apply the Changes: - Apply the secret, service account, and updated deployment using 'kubectl apply -f commands.
NEW QUESTION # 38
SIMULATION
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.
Answer:
Explanation:
A service account provides an identity for processes that run in a Pod.
When you (a human) access the cluster (for example, using kubectl), you are authenticated by the apiserver as a particular User Account (currently this is usually admin, unless your cluster administrator has customized your cluster). Processes in containers inside pods can also contact the apiserver. When they do, they are authenticated as a particular Service Account (for example, default).
When you create a pod, if you do not specify a service account, it is automatically assigned the default service account in the same namespace. If you get the raw json or yaml for a pod you have created (for example, kubectl get pods/<podname> -o yaml), you can see the spec.serviceAccountName field has been automatically set.
You can access the API from inside a pod using automatically mounted service account credentials, as described in Accessing the Cluster. The API permissions of the service account depend on the authorization plugin and policy in use.
In version 1.6+, you can opt out of automounting API credentials for a service account by setting automountServiceAccountToken: false on the service account:
apiVersion: v1
kind: ServiceAccount
metadata:
name: build-robot
automountServiceAccountToken: false
...
In version 1.6+, you can also opt out of automounting API credentials for a particular pod:
apiVersion: v1
kind: Pod
metadata:
name: my-pod
spec:
serviceAccountName: build-robot
automountServiceAccountToken: false
...
The pod spec takes precedence over the service account if both specify a automountServiceAccountToken value.
NEW QUESTION # 39
You are deploying a microservice application on Kubernetes, and you are concerned about the potential for one microservice to compromise the security of other microservices in the cluster. How can you use Kubernetes features to implement isolation between your microservices and minimize this risk?
Answer:
Explanation:
Solution (Step by Step) :
1. Namespaces: Use Kubernetes namespaces to logically separate your microservices. Each namespace can have its own set of resources, security
policies, and network configurations.
- Example: You could create namespaces for "user-service", "order-service", "payment-service", etc.
2. Network Policies: Define network policies to control communication between pods within and across namespaces.
- Example:
3. Pod Security Policies (PSPs): Use PSPs to restrict the capabilities and resources that pods can use. - Example:
4. Service Accounts: Create separate service accounts for each microservice and restrict their permissions. - Example: Use RBAC (Role-Based Access Control) to define roles and bindings for each service account 5. Resource Quotas: Limit the resources (CPU, memory, etc.) that each microservice can consume. This helps prevent one microservice from ovenvhelming the cluster and impacting others. 6. Security Context: Use the 'securitycontext field in pod definitions to apply security restrictions to individual pods. - Example:
7. Pod Disruption Budgets (PDB): Set up PD8s to ensure that a minimum number of pods remain running for each microservice, even during upgrades or disruptions. 8. Least Privilege: Follow the principle of least privilege, only granting each microservice the minimum access it needs to perform its function.
NEW QUESTION # 40
You are tasked with securing the container image supply chain for your organization_ You are using a container registry that supports signing and verification of container images. You need to create a policy that ensures only signed images from a specific trusted source are deployed to your Kubernetes cluster.
Answer:
Explanation:
Solution (Step by Step) :
1. Configure the Container Registry:
- Enable Image Signing: Enable image signing functionality in your container registry (e.g., Docker Hub, Google Container Registry, etc.).
- Create a Signing Key: Generate a signing key and store it securely. This key will be used to sign images from the trusted source.
2 Create a Kubernetes Admission Controller:
- Use an Admission Controller like "Container Image Signature Validation Admission Webhook" to enforce image signature verification during deployment. This Admission Controller ensures that only signed images are allowed to be deployed to your cluster.
3. Configure the Admission Controller:
- Create a Service Account: Create a Service Account with the necessary permissions to access your container registry and verify image signatures.
- Create a Deployment for the Admission Controller: Deploy the Admission Controller with a pod using the Service Account created earlier.
- Configure the Admission Controller: Configure the Admission Controller to use your signing key to verify signatures.
4. Deploy Signed Images:
- Sign Images: Use the signing key to sign images from the trusted source before pushing them to the container registry.
- Deploy Signed Images: Deploy the signed images to your Kubernetes cluster. The Admission Controller will verity their signatures before allowing the deployment.
Example:
This example uses the 'image-signature-validator' container image available on Quay.i0. The 'config.yamr file in the ConfigMap defines the signing key and trusted image sources. Remember to replace these values with your actual information.
NEW QUESTION # 41
SIMULATION
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:- ETCDCTL_API=3 etcdctl get /registry/secrets/default/cks-secret --cacert="ca.crt" --cert="server.crt" --key="server.key" 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.
Answer:
Explanation:
See the Explanation belowExplanation:
ETCD secret encryption can be verified with the help of etcdctl command line utility.
ETCD secrets are stored at the path /registry/secrets/$namespace/$secret on the master node.
The below command can be used to verify if the particular ETCD secret is encrypted or not.
# ETCDCTL_API=3 etcdctl get /registry/secrets/default/secret1 [...] | hexdump -C
NEW QUESTION # 42
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