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Linux 基金會 CKS（Certified Kubernetes Security Specialist）認證考試是 Kubernetes 安全領域中最負盛名的認證之一。它旨在測試那些與 Kubernetes 一起工作並希望驗證其安全最佳實踐理解的專業人士的技能和知識。Kubernetes 是一個開源的容器編排系統，在行業中廣泛用於管理容器化應用程序。然而，當談到 Kubernetes 時，安全是最重要的問題之一，而這就是 CKS 認證發揮作用的地方。
通過CKS 考試不是很簡單的。通過CKS考試需要高度專業的知識，如果你還欠缺這方面的知識，Testpdf可以為你提供知識的來源。Testpdf的專家團隊以他們的豐富的專業知識和經驗幫助你增長知識，並且給你能提供CKS認證考試的相關練習題和答案。Testpdf會盡全力幫助你一次性通過CKS認證考試，並且還可以鞏固你的IT專業知識。選擇了Testpdf不僅可以保證你100%通過CKS認證考試，並且還會為你提供一年的免費的練習題和答案的更新服務。如果你考試不小心失敗了，我們保證立刻地100%全額退款給您。
CKS認證考試涵蓋了多個與安全相關的主題，包括容器安全、Kubernetes API安全、網絡安全、訪問控制、審計和日誌等。候選人必須對Kubernetes安全概念有扎實的理解，包括如何保護Kubernetes部署、實施安全政策和管理安全風險。他們還必須能夠展示他們使用Kubernetes安全工具（如kube-bench、kube-hunter等）識別和緩解安全漏洞的能力。總的來說，CKS認證考試是專業人士提升Kubernetes安全技能和展示在這個高度競爭的領域中專業知識的絕佳途徑。
問題 #43
You have a microservice application running in a Kubernetes cluster with a sidecar container responsible for logging. The sidecar container has access to the main application containers sensitive data, including credentials. You need to implement a security policy to prevent the sidecar container from accessing the main application container's data.
答案：
解題說明：
Solution (Step by Step) :
1. Create a Securitycontext for the main application container:
2. Apply the updated Deployment: bash kubectl apply -f my-app-deployment.yaml - The readOnlyRootFilesystem: true' setting in the main application container's security context prevents the sidecar container from writing to the main container's filesystem. - This ensures that the sidecar container cannot modify or access the main application's sensitive data. Important Notes: - This policy restricts the sidecar container from accessing the main containers data through the filesystem. - If the sidecar needs access to specific data, you can mount a shared volume that is read-only for the sidecar container and read-write for the main container. - It's crucial to review the security context of both main and sidecar containers to ensure that all necessary access restrictions are implemented.
問題 #44
You have an application running in a Kubernetes cluster that requires access to a database hosted in a different namespace. You want to implement a secure mecnanism to allow the application to access the database witnout granting it access to all resources in the database namespace.
答案：
解題說明：
Solution (Step by Step) :
1. Create a Service Account in the Application Namespace:
- In the application's namespace, create a service account named 'db-access-sa'
2. Create a Role in the Database Namespace:
- In the database namespace, create a custom role named 'db-access-role' that grants only the required permissions to the database.
- For example, you might grant access to specific database tables, views, or stored procedures.
- Create a custom role named 'db-access-role' in the namespace where your database is running to grant only read permissions to the database.
3. Create a ROIeBinding in the Database Namespace: - In the database namespace, create a role binding named 'db-access-binding' that associates the 'db-access-sa' service account (from the application's namespace) with the 'db-access-role'.
4. Configure Your Application: - Configure your application deployment to use the 'db-access-sa' service account. - Use the Kubernetes API to connect to the database using the provided credentials or secrets.
問題 #45
Use the kubesec docker images to scan the given YAML manifest, edit and apply the advised changes, and passed with a score of 4 points.
kubesec-test.yaml
apiVersion: v1
kind: Pod
metadata:
name: kubesec-demo
spec:
containers:
- name: kubesec-demo
image: gcr.io/google-samples/node-hello:1.0
securityContext:
readOnlyRootFilesystem: true
Hint: docker run -i kubesec/kubesec:512c5e0 scan /dev/stdin < kubesec-test.yaml
答案：
解題說明：
kubesec scan k8s-deployment.yaml
cat <<EOF > kubesec-test.yaml
apiVersion: v1
kind: Pod
metadata:
name: kubesec-demo
spec:
containers:
- name: kubesec-demo
image: gcr.io/google-samples/node-hello:1.0
securityContext:
readOnlyRootFilesystem: true
EOF
kubesec scan kubesec-test.yaml
docker run -i kubesec/kubesec:512c5e0 scan /dev/stdin < kubesec-test.yaml kubesec http 8080 &
[1] 12345
{"severity":"info","timestamp":"2019-05-12T11:58:34.662+0100","caller":"server/server.go:69","message":"Starting HTTP server on port 8080"} curl -sSX POST --data-binary @test/asset/score-0-cap-sys-admin.yml http://localhost:8080/scan
[
{
"object": "Pod/security-context-demo.default",
"valid": true,
"message": "Failed with a score of -30 points",
"score": -30,
"scoring": {
"critical": [
{
"selector": "containers[] .securityContext .capabilities .add == SYS_ADMIN",
"reason": "CAP_SYS_ADMIN is the most privileged capability and should always be avoided"
},
{
"selector": "containers[] .securityContext .runAsNonRoot == true",
"reason": "Force the running image to run as a non-root user to ensure least privilege"
},
// ...
問題 #46
You are running a Kubernetes cluster with a deployment named "my-app" that has been experiencing unexpected crashes. The crash logs indicate that the container's memory consumption is exceeding the resource limits defined in the deployment YAML. Explain how you can utilize the Kubernetes resource quotas and admission controller to prevent this from happening again.
答案：
解題說明：
Solution (Step by Step) :
1. Create a ResourceQuota:
- Define a ResourceQuota that limits the resources that can be consumed by pods in a specific namespace.
- Specify the limits for CPU, memory, storage, and other resources.
- For example, to limit memory usage to 2Gi per pod in the "my-app" namespace:
2. Enable the Resourceauota Admission Controller: - Ensure that the "Resourceauota" admission controller is enabled in your Kubernetes cluster. This can usually be done by setting the 'admissioncontror flag in the 'kube-apiserver' configuration. 3. Apply the ResourceQuota: - Apply the ResourceQuota to the "my-app" namespace using 'kubectl apply -f resource-quota_yaml 4. Update the Deployment - Modify the deployment's YAML file to specify the resource requests and limits for the container, ensuring they are within the defined ResourceQuota limits. For example:
5. Apply the updated deployment - Apply the updated deployment using 'kubectl apply -f deployment.yaml' 6. Monitor and Evaluate: - Monitor the resource consumption of pods in the "my-app" namespace and adjust the ResourceQuota limits as needed to ensure that your cluster remains stable.
問題 #47
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://test-server.local.8081/image_policy
答案：A
解題說明：
2. Validate the control configuration and change it to implicit deny.
Finally, test the configuration by deploying the pod having the image tag as latest.
問題 #48
......
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