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Scenarios of our Certified Kubernetes Security Specialist (CKS) (CKS) practice tests are similar to the actual CKS exam. You feel like sitting in the real CKS exam while taking these Certified Kubernetes Security Specialist (CKS) (CKS) practice exams. Practicing under these conditions helps you cope with Linux Foundation CKS Exam anxiety. Moreover, regular attempts of the CKS practice test are also beneficial to enhance your speed of completing the final Certified Kubernetes Security Specialist (CKS) (CKS) test within the given time.
| Section | Weight | Objectives |
|---|---|---|
| Cluster Hardening | 15% | - Authentication and authorization - API server security |
| Monitoring, Logging and Runtime Security | 15% | - Audit logging and monitoring - Runtime threat detection |
| System Hardening | 15% | - Kernel and node security configuration - Host security controls |
| Cluster Setup | 15% | - Hardening cluster components - Secure installation configuration |
| Supply Chain Security | 20% | - Image scanning and verification - Secure CI/CD practices |
| Minimizing Microservice Vulnerabilities | 20% | - Pod security standards - Container isolation and security contexts |
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NEW QUESTION # 36
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 # 37
You are running a web application in a Kubernetes cluster using a Deployment. You want to implement a security measure to ensure that the application container only has access to the necessary system calls and files. You're worried about potential exploits that could give the container excessive privileges. Explain how you would use Seccomp profiles to achieve this, and provide an example Seccomp profile using a JSON format.
Answer:
Explanation:
Solution (Step by Step) :
1. Understand Seccomp: Seccomp (Secure Computing Mode) is a Linux kernel feature that allows you to restrict the system calls that a process can make. You can define a profile that lists the allowed system calls, effectively creating a "sandbox" for the container.
2. Create a Seccomp Profile: You can create a Seccomp profile in a JSON format. Here's an example:
3. Apply the Seccomp Profile: You can apply the Seccomp profile to your container using the 'securitycontext' field in your Deployment YAML.
4. Test and Verify: After deploying your Deployment, test your application and make sure it functions as expected. You can verity that the Seccomp profile is working by attempting to run commands within the container that are not allowed by your profile.
NEW QUESTION # 38
You have a Kubernetes cluster with a deployment running a critical application. You need to restrict inbound network access to the pods in this deployment to only allow traffic from a specific service within the cluster. How would you achieve this using NetworkPolicy?
Answer:
Explanation:
Solution (Step by Step):
1. Create a NetworkP01icy: Define a NetworkPoliCY resource that specifies the allowed ingress traffic.
- Name: 'allow-service-access (you can choose any name)
- Namespace: The same namespace as the deployment you want to restrict.
- Spec:
- PodSeIector: This should match the pods in your deployment. You can use labels to select the pods.
- Ingress: This defines the allowed incoming traffic.
- From: Define the source of the allowed traffic.
- PodSeIector: If the traffic is coming from another deployment within the cluster, you can define the pod selector for that deployment.
- Namespaceselector: It the traffic is coming trom a service within the cluster, you can define the namespace selector.
- IPBIock: If the traffic is coming from a specific IP range, you can use 'IP310ck' to define that.
- Ports: This defines the specific ports that are allowed.
- You can either specify individual (e.g., 'tcp:80') or a port range (e.g., 'tcp:80-8080').
2. Apply the NetworkPolicy:
- Use 'kubectl apply -f networkpolicy.yamr to create the NetworkPolicy.
Example YAML for NetworkPolicy:
- The NetworkP01icy allows inbound traffic from any pod in the namespace With label - This traffic can access port 80 (TCP) on the pods with the label 'app: Important Notes: - NetworkPolicies are enforced at the pod level. If no NetworkPolicy is defined, all traffic is allowed by default. - If you need to allow traffic from multiple sources, you can define multiple 'ingress' rules within the NetworkPolicy. - Make sure you have sufficient understanding of Kubernetes Networking and NetworkPolicy concepts before implementing this.
NEW QUESTION # 39
You are responsible for hardening a Kubernetes cluster hosting sensitive financial data. One of the key security concerns is preventing data exfiltration. How can you use Kubernetes Network Policy to enforce network isolation and prevent unauthorized data access?
Answer:
Explanation:
Solution (Step by Step) :
1. Define the network policy rules:
- Identify tne pods that contain sensitive data and the services they interact with. Use labels to identify these pods and services.
- Create network policies that restrict communication between these pods and the outside world. These policies should only allow traffic from authorized sources, such as internal services or authorized user applications.
2. Create the network policy:
- Define the policy using the 'kubectl apply' command. The policy should specify the target pods, allowed ingress and egress traffic, and the allowed ports and protocols.
3. Deploy the network policy:
- Apply the network policy to the cluster. The policy will be enforced by the Kubemetes network plugin.
Example network policy:
This policy restricts the communication of pods with the label Sapp: financial-data' to only internal services with the label Sapp: internal-service' and to specific IP addresses in the range ' 10.0.0.0/16'. This helps prevent data exfiltration by restricting access to external services or unauthorized clients.
NEW QUESTION # 40
You have a Kubernetes cluster witn a Deployment named 'my-app' that runs multiple replicas of an application. The application exposes an API endpoint on port 8080- You need to configure a network policy that allows only specific IP addresses to access this endpoint.
Answer:
Explanation:
Solution (Step by Step) :
1. Create a Network Policy:
- Define a NetworkPoIicy resource with a 'podSeIector targeting the 'my-app' Deployment
- Specify an 'ingress' rule that allows traffic from the allowed IP addresses.
- Use the 'from' field to specify the source IP addresses. You can either provide individual IP addresses or CIDR ranges.
- Ensure that the port 8080 is allowed in the 'ports field.
2. Apply the Network Policy: - Apply the YAML file using 'kubectl apply -f my-app-network-policy.yamr 3. Verify the Network Policy: - Use 'kubectl get networkpolicies' to list the available network policies. - Use kubectl describe networkpolicy my-app-network-policy' to view the details of the applied policy. 4. Test the Network Policy: - Attempt to access the API endpoint from an allowed IP address and verify that the connection is successful. - Attempt to access the API endpoint from a blocked IP address and verity that the connection is denied.
NEW QUESTION # 41
......
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