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| Section | Weight | Objectives |
|---|---|---|
| Cluster Hardening | 15% | - Authentication and authorization - API server security |
| Minimizing Microservice Vulnerabilities | 20% | - Pod security standards - Container isolation and security contexts |
| Monitoring, Logging and Runtime Security | 15% | - Runtime threat detection - Audit logging and monitoring |
| System Hardening | 15% | - Host security controls - Kernel and node security configuration |
| Supply Chain Security | 20% | - Secure CI/CD practices - Image scanning and verification |
| Cluster Setup | 15% | - Hardening cluster components - Secure installation configuration |
>> CKS Exam Questions Answers <<
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NEW QUESTION # 24
You are managing a Kubernetes cluster With a critical application deployed as a Deployment. You need to ensure that only authorized users can access the Kubernetes API to manage this application's resources. Describe the security measures you would implement to restrict access to the Kubernetes API and ensure only authorized users can manage this specific Deployment
Answer:
Explanation:
Solution (Step by Step):
1. Create a Service Account:
- Create a dedicated Service Account for the application:
2. Configure the Deployment to use the Service Account - Update the Deployment YAML to specify the Service Account:
3. Use RBAC (Role-Based Access Control): - Create a Role and RoleBinding for the Service Account:
4. Apply the Changes: - Apply the YAML configurations using 'kubectl apply -f critical-app.yaml' 5. Restrict Access to the Kubernetes API: - Use kubeconfig files to limit access to the API for specific users or groups. - Use tools like 'kubectl auth can-i' to verify access permissions. 6. Limit Access to Specific Namespaces: - By default, Service Accounts have access to resources in their respective namespaces. - To further restrict access, create a Namespace and limit the Service Account's permissions within that namespace. By implementing these measures, you create a secure environment where only authorized users (through the Service Account) can manage the critical application's Deployment
NEW QUESTION # 25
SIMULATION
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.
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
Answer:
Explanation:
Kubernetes auditing provides a security-relevant chronological set of records about a cluster. Kube-apiserver performs auditing. Each request on each stage of its execution generates an event, which is then pre-processed according to a certain policy and written to a backend. The policy determines what's recorded and the backends persist the records.
You might want to configure the audit log as part of compliance with the CIS (Center for Internet Security) Kubernetes Benchmark controls.
The audit log can be enabled by default using the following configuration in cluster.yml:
services:
kube-api:
audit_log:
enabled: true
When the audit log is enabled, you should be able to see the default values at /etc/kubernetes/audit-policy.yaml The log backend writes audit events to a file in JSONlines format. You can configure the log audit backend using the following kube-apiserver flags:
--audit-log-path specifies the log file path that log backend uses to write audit events. Not specifying this flag disables log backend. - means standard out
--audit-log-maxage defined the maximum number of days to retain old audit log files
--audit-log-maxbackup defines the maximum number of audit log files to retain
--audit-log-maxsize defines the maximum size in megabytes of the audit log file before it gets rotated If your cluster's control plane runs the kube-apiserver as a Pod, remember to mount the hostPath to the location of the policy file and log file, so that audit records are persisted. For example:
--audit-policy-file=/etc/kubernetes/audit-policy.yaml \
--audit-log-path=/var/log/audit.log
NEW QUESTION # 26
You have a Kubernetes cluster with a Deployment named 'my-app' that exposes a service on port 80. You want to enforce a policy that allows only traffic from pods With a specific label to access this service.
Answer:
Explanation:
Solution (Step by Step) :
1. Create a NetworkPolicy:
- Define a NetworkPolicy resource with a 'podSelector' that matches the 'my-app' Deployment.
- Create an 'ingress' rule that allows traffic only from pods with the specific label.
- Use the 'from' field to specify the label selector.
- Ensure that the port 80 is included in the 'ports' field.
2. Apply the NetworkPolicy: - Apply the YAML file using 'kubectl apply -f my-app-label-policy-yamr 3. Verify the NetworkPolicy: - Use 'kubectl get networkpolicies' to list the available network policies. - Use 'kubectl describe networkpolicy my-app-label-policy' to view the details ot the applied policy. 4. Test the NetworkPolicy: - Deploy a pod with the label 'allowed: true' and attempt to access the service on port 80. Verify that the connection is successful. - Deploy a pod without the label 'allowed: true' and attempt to access the service on port 80. Verify that the connection is denied.
NEW QUESTION # 27
You are configuring a Kubernetes cluster with a deployment named 'secure-app' that uses a secret named 'my-secret to access sensitive information You need to implement an Admission Controller webhook to enforce a policy that prevents the deployment from starting if the 'my-secret secret is not present in the cluster.
Answer:
Explanation:
Solution (Step by Step) :
1. Create a Deployment with a Secret Dependency:
- Create a Deployment YAML file named 'secure-app-deployment.yaml that depends on the 'my-secret secret.
2. Create the Admission Controller Webhook Server: - You will need to create a server that will implement the Admission Controller webhook logic This can be a simple web server written in any language that can receive and process AdmissionReview requests. - Here's an example in Node.js using the 'express' framework:
3. Configure the Admission Controller Webhook in Kubernetes: - Create a ValidatingWebhookConfiguration YAML file named 'secure-app-webhook.yaml that specifies the webhook configuration:
- Create the Webhook Service: - Create a Service YAML file named 'secure-app-webhook-service.yamr to expose the webhook server:k
4. Apply the Webhook Configuration and Service: - Apply the YAML files using kubectl apply -f secure-app-webhook.yaml secure-app-webhook-service.yaml 5. Test the Admission Controller: - Try creating the 'secure-app' deployment without the 'my-secret' secret. The deployment creation should fail, and you should see the message from the webhook server - Create the 'my-secret' secret and then try creating the 'secure-app' deployment again. The deployment should now be created successfully.
NEW QUESTION # 28
You are deploying a containerized application that requires root privileges to perform certain tasks. However, you want to minimize the security risks associated with running the container as root Explain how to use capabilities to achieve this.
Answer:
Explanation:
Solution (Step by Step) :
1. Identify Required Capabilities:
- Determine the specific capabilities that your application requires.
- For example, if the application needs to access network devices or manipulate system files, it might need capabilities like 'NET ADMIN' or 'SYS ADMIN'.
2. Configure the Capabilities in the Pod Spec:
- In the pod spec's 'securityContext', define the 'capabilities' field.
- Add the required capabilities to the 'requestedCapabilities' list.
- You can also specify 'dropCapabilitieS to remove unnecessary capabilities from the container
- Example:
3. Build and Deploy the Container: - Build your container image, ensuring that the Dockerflle or build process includes any necessary system calls or libraries that are used by the application. 4. Test and Verify: - Deploy the pod and run the application. - Verify that the application functions correctly with the granted capabilities. - You can use tools like 'ps aux' and 'strace' to check that the application is using only the specific capabilities you have allowed. 5. Minimize Attack Surface: - Even with selective capabilities, it's crucial to minimize the overall attack surface by following other security best practices: - Use a minimal base image for your container. - Avoid running the container with unnecessary privileges. - Regularly update your container images and your Kubernetes cluster. - Implement strong authentication and authorization controls.
NEW QUESTION # 29
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