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| Section | Weight | Objectives |
|---|---|---|
| Minimize Microservice Vulnerabilities | 20% | - Use AppArmor or seccomp profiles to constrain container behavior - Set appropriate security contexts for pods and containers - Use OPA Gatekeeper to enforce security controls - Use PSP to enforce security controls - Understand the principle of immutable containers - Configure network policies for namespace isolation |
| System Hardening | 15% | - Enable audit logging - Understand the concept of OPA (Open Policy Agent) and Gatekeeper - Modify host components to improve security - Kernel defaults and parameters using sysctl |
| Cluster Setup | 10% | - Manage sensitive information in clusters - Use Pod Security Policies to control security-related pod behaviors - Implement Pod-to-Pod encryption using mTLS or WireGuard - Use role-based access control (RBAC) to minimize exposure - Use Cis benchmarks to check Kubernetes cluster settings - Understand the security implications of embedding cloud provider flags - Configure TLS certificates and minimum version for etcd |
| Supply Chain Security | 20% | - Use static analysis tools to detect vulnerabilities - Minimize base image footprint - Understand image security scanning and its workflow - Use image admission controllers to prevent use of untrusted images - Sign container images and verify signatures - Understand the software supply chain best practices - Understand the container build process - Use distroless images for static workload |
| Cluster Hardening | 15% | - Minimize admission of containers with sharing the host network namespace - Minimize admission of containers that allow host namespaces - Minimize admission of containers with sharing the host process namespace - Minimize admission of containers with capabilities assigned - Minimize admission of containers with sharing the host IPC namespace - Minimize admission of containers without a security context - Minimize admission of containers with hostPath volumes - Minimize admission of privileged containers - Minimize admission of containers with added capabilities - Minimize admission of containers with FlexVolume volumes - Minimize admission of containers without AppArmor profile - Minimize admission of containers with raw block devices - Minimize admission of containers with allowPrivilegeEscalation - Minimize admission of containers without seccomp profiles |
| Monitoring, Logging, and Runtime Security | 20% | - Perform behavioral analytics to detect malicious activity - Minimize the attack surface using container health indicators - Falco - container security monitoring and threat detection - Understand and monitor network traffic - Audit and detect logs and events for anomalies - Detect threats at the container level |
If you want to demonstrate your expertise in solving complex Linux Foundation real-life problems, then you need to pass the Linux Foundation CKS certification exam. However, passing this exam is not an easy task. It requires you to master complicated subjects related to Certified Kubernetes Security Specialist (CKS). To help you prepare for this exam, ITexamReview offers verified Linux Foundation CKS Exam Questions that are ruling the preparation world.
NEW QUESTION # 49
SIMULATION
You can switch the cluster/configuration context using the following command:
[desk@cli] $ kubectl config use-context qa
Context:
A pod fails to run because of an incorrectly specified ServiceAccount
Task:
Create a new service account named backend-qa in an existing namespace qa, which must not have access to any secret.
Edit the frontend pod yaml to use backend-qa service account
Note: You can find the frontend pod yaml at /home/cert_masters/frontend-pod.yaml
Answer:
Explanation:
See the Explanation belowExplanation:
[desk@cli] $ k create sa backend-qa -n qa
sa/backend-qa created
[desk@cli] $ k get role,rolebinding -n qa
No resources found in qa namespace.
[desk@cli] $ k create role backend -n qa --resource pods,namespaces,configmaps --verb list
# No access to secret
[desk@cli] $ k create rolebinding backend -n qa --role backend --serviceaccount qa:backend-qa
[desk@cli] $ vim /home/cert_masters/frontend-pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: frontend
spec:
serviceAccountName: backend-qa # Add this
image: nginx
name: frontend
[desk@cli] $ k apply -f /home/cert_masters/frontend-pod.yaml
pod created
[desk@cli] $ k create sa backend-qa -n qa
serviceaccount/backend-qa created
[desk@cli] $ k get role,rolebinding -n qa
No resources found in qa namespace.
[desk@cli] $ k create role backend -n qa --resource pods,namespaces,configmaps --verb list role.rbac.authorization.k8s.io/backend created
[desk@cli] $ k create rolebinding backend -n qa --role backend --serviceaccount qa:backend-qa rolebinding.rbac.authorization.k8s.io/backend created
[desk@cli] $ vim /home/cert_masters/frontend-pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: frontend
spec:
serviceAccountName: backend-qa # Add this
image: nginx
name: frontend
[desk@cli] $ k apply -f /home/cert_masters/frontend-pod.yaml
pod/frontend created
https://kubernetes.io/docs/tasks/configure-pod-container/configure-service-account/
NEW QUESTION # 50
A container image scanner is set up on the cluster.
Given an incomplete configuration in the directory
/etc/Kubernetes/confcontrol and a functional container image scanner with HTTPS endpoint https://acme.local.8081/image_policy
Answer: A
Explanation:
2. Validate the control configuration and change it to implicit deny.
Finally, test the configuration by deploying the pod having the image tag as the latest.
NEW QUESTION # 51
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 # 52
You are setting up a Kubernetes cluster that requires strong security measures. You need to implement several security best practices, including.
- Pod Security Policy: Implement a default Pod Security Policy that restricts resource requests, limits privilege escalation, and disables container root access.
- Network Policy: Configure network policies to restrict communication between pods within the cluster, enforcing a principle of least privilege.
- Admission Controller: Use the 'PodSecurityPolicys admission controller to enforce the defined Pod Security Policy rules.
How would you set up a secure Kubernetes cluster, including the configuration of a default Pod Security Policy, network policies, and the 'PodSecuntyP01icy' admission controller, to enforce these security best practices?
Answer:
Explanation:
Solution (Step by Step) :
1. Create a Default Pod Security Policy:
- Create a YAML file named 'psp.yaml' with the following content:
2. Create Network Policies: - Create separate YAML files for each network policy you need. - For example, a policy to restrict communication between pods in the 'frontend' and 'backend' namespaces could be defined as:
3. Enable the 'PodSecurityPolicy' Admission Controller: - Modify the Kubernetes API server configuration (e.g., vetc'kubernetes/manifests/kube-apiserver.yaml') to enable the 'PodSecurityPolicy' admission controller: - Add the following line: '--admission-control=NamespaceLifecycle,LimitRanger,ServiceAccount,PodSecurityPolicy' 4. Apply the Configuration: - Apply the 'psp.yaml' and network policy files to the cluster using 'kubectl apply -f -yamr - Restart the Kubernetes API server for the changes to take effect. 5. Test the Configuration: - Try to create a pod that violates the Pod Security Policy rules. - You should see an error message indicating that the PodSecurityPolicy is preventing the pod creatiom - Test the network policies by attempting to communicate between pods and verifying that traffic is restricted according to the defined rules. 6. Monitor and Adjust - Monitor the cluster for any potential issues caused by the security policies. - Adjust the policies as needed based on evolving security requirements and application needs. Note: It's recommended to use a tool like 'kubectl apply -f -s to pipe the content of the YAML files to the command for applying the resources.
NEW QUESTION # 53
You are running a web application in a Kubernetes cluster using a Deployment named 'web-apps. The application is vulnerable to a known CVE that can be exploited through tne web server. You need to implement a security policy to prevent pods from accessing the vulnerable web server port.
Answer:
Explanation:
Solution (Step by Step) :
1. Identity the vulnerable port:
- For this example, assume the vulnerable port is 8080.
2. Create a Securitycontext for the web server:
3. Apply the updated Deployment: bash kubectl apply -f web-app-deployment.yaml - The 'securityContext' is used to restrict the capabilities of the container. - 'drop: ["NET BIND SERVICET prevents the container from binding to ports below 1024 (including port 8080). - This policy will prevent pods from accessing the vulnerable web server port and mitigate the CVE. Important Notes: - You can adjust the 'drop' list to restrict other capabilities as needed. - You might need to redeploy the web application with a different port that is not restricted-
NEW QUESTION # 54
......
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