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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Cluster Setup | 15% | - Hardening cluster components - Secure installation configuration |
| Topic 2: Supply Chain Security | 20% | - Secure CI/CD practices - Image scanning and verification |
| Topic 3: Minimizing Microservice Vulnerabilities | 20% | - Pod security standards - Container isolation and security contexts |
| Topic 4: Cluster Hardening | 15% | - API server security - Authentication and authorization |
| Topic 5: System Hardening | 15% | - Kernel and node security configuration - Host security controls |
| Topic 6: Monitoring, Logging and Runtime Security | 15% | - Runtime threat detection - Audit logging and monitoring |
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NEW QUESTION # 43
SIMULATION
Context
A CIS Benchmark tool was run against the kubeadm-created cluster and found multiple issues that must be addressed immediately.
Task
Fix all issues via configuration and restart the affected components to ensure the new settings take effect.
Fix all of the following violations that were found against the API server:
Fix all of the following violations that were found against the Kubelet:
Fix all of the following violations that were found against etcd:
Answer:
Explanation:
See the Explanation below
Explanation:
NEW QUESTION # 44
Cluster: admission-cluster
Master node: master
Worker node: worker1
You can switch the cluster/configuration context using the following command:
[desk@cli] $ kubectl config use-context admission-cluster
Context:
A container image scanner is set up on the cluster, but it's not yet fully integrated into the cluster's configuration. When complete, the container image scanner shall scan for and reject the use of vulnerable images.
Task:
You have to complete the entire task on the cluster's master node, where all services and files have been prepared and placed.
Given an incomplete configuration in directory /etc/Kubernetes/config and a functional container image scanner with HTTPS endpoint https://imagescanner.local:8181/image_policy:
1. Enable the necessary plugins to create an image policy
2. Validate the control configuration and change it to an implicit deny
3. Edit the configuration to point to the provided HTTPS endpoint correctly Finally, test if the configuration is working by trying to deploy the vulnerable resource /home/cert_masters/test-pod.yml Note: You can find the container image scanner's log file at /var/log/policy/scanner.log
Answer:
Explanation:
[master@cli] $ cd /etc/Kubernetes/config
1. Edit kubeconfig to explicity deny
[master@cli] $ vim kubeconfig.json
"defaultAllow": false # Change to false
2. fix server parameter by taking its value from ~/.kube/config
[master@cli] $cat /etc/kubernetes/config/kubeconfig.yaml | grep server
server:
3. Enable ImagePolicyWebhook
[master@cli] $ vim /etc/kubernetes/manifests/kube-apiserver.yaml
- --enable-admission-plugins=NodeRestriction,ImagePolicyWebhook # Add this
- --admission-control-config-file=/etc/kubernetes/config/kubeconfig.json # Add this Explanation
[desk@cli] $ ssh master
[master@cli] $ cd /etc/Kubernetes/config
[master@cli] $ vim kubeconfig.json
{
"imagePolicy": {
"kubeConfigFile": "/etc/kubernetes/config/kubeconfig.yaml",
"allowTTL": 50,
"denyTTL": 50,
"retryBackoff": 500,
"defaultAllow": true # Delete this
"defaultAllow": false # Add this
}
}
Note: We can see a missing value here, so how from where i can get this value
[master@cli] $cat ~/.kube/config | grep server
or
[master@cli] $cat /etc/kubernetes/manifests/kube-apiserver.yaml
[master@cli] $vim /etc/kubernetes/config/kubeconfig.yaml
[master@cli] $ vim /etc/kubernetes/manifests/kube-apiserver.yaml - --enable-admission-plugins=NodeRestriction # Delete This - --enable-admission-plugins=NodeRestriction,ImagePolicyWebhook # Add this - --admission-control-config-file=/etc/kubernetes/config/kubeconfig.json # Add this Reference: https://kubernetes.io/docs/reference/access-authn-authz/admission-controllers/
- --enable-admission-plugins=NodeRestriction # Delete This
- --enable-admission-plugins=NodeRestriction,ImagePolicyWebhook # Add this
- --admission-control-config-file=/etc/kubernetes/config/kubeconfig.json # Add this
[master@cli] $ vim /etc/kubernetes/manifests/kube-apiserver.yaml - --enable-admission-plugins=NodeRestriction # Delete This - --enable-admission-plugins=NodeRestriction,ImagePolicyWebhook # Add this - --admission-control-config-file=/etc/kubernetes/config/kubeconfig.json # Add this Reference: https://kubernetes.io/docs/reference/access-authn-authz/admission-controllers/
NEW QUESTION # 45
You are running a Kubernetes cluster with a deployment named "my-app" that uses a container image from a public registry. The container image has a vulnerability in a library it uses. You want to prevent any container from using that vulnerable image. How would you implement this using a container image registry and admission control policies?
Answer:
Explanation:
Solution (Step by Step) :
1. Create a Custom Container Image Registry:
- Create a private container image registry, such as Harbor, JFrog Xray, or GitLab Container Registry to manage your container images and enforce security policies.
2. Configure Image Scanning and Policies:
- Set up image scanning in your chosen registry to automatically scan incoming images for vulnerabilities. Configure policies to block images with specific vulnerabilities or based on severity levels.
3. Set up Admission Control Policies:
- Configure Kubernetes admission control to enforce image scanning and registry-based access control.
- Use admission webhooks to intercept pod creation requests and verify that the container image used in the pod is authorized.
- For example, you can create an admission webhook that checks if the image is stored in your private registry and has passed vulnerability scanning.
If the image is not in the registry or has known vulnerabilities, the webhook will deny the pod creation.
4. Deploy the Vulnerability-Free Image:
- Update the container image used by your "my-app" deployment with a patched or vulnerability-free version. Push this updated image to your private registry.
5. Update the Deployment
- Update the "my-app" deployment configuration to pull the container image from your private registry.
6. Monitor and Evaluate:
- Monitor the logs of your container image registry and Kubernetes admission controller for any errors or blocked images. Regularly review the vulnerability scan reports for any new vulnerabilities.
NEW QUESTION # 46
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
Answer: A
NEW QUESTION # 47
You're tasked witn securing a Kubernetes cluster running on Google Kubernetes Engine (GKE). One of the key security objectives is to ensure that only authorized users can access the cluster's API server and that communication between components within the cluster is encrypted. You need to configure the clusters network policy and authentication mechanism to enforce these security controls. Explain step-by-step how you would configure GKE's network policies and authentication mechanisms to achieve these objectives.
Answer:
Explanation:
Solution (Step by Step) :
1. Configure Network Policies:
- Create Network Policies: use the 'kubectl' command to create network policies that define the communication rules between pods and services. For
example:
bash
kubectl apply -f network-policy-yaml
- Define Rules: Specify the rules in the network policy. For example:
- Apply Policy: Apply the policy using kubectl apply -f network-policy-yaml- 2. Configure Authentication: - Enable Service Account Authentication: Configure service accounts to access the API server. In GKE, you can enable service account authentication by creating a service account key. - Create Service Account Key: Create a service account key with the following command: bash gcloud iam service-accounts keys create service-account-key.json -jam-account service-account@project_iam_gserviceaccount.com - Restrict Access: Configure the service account's permissions to minimize the risk of unauthorized access. Use the IAM policy to grant the service account access only to the required resources. 3. Configure Encryption: - Enable HTTPS for the API Server: In GKE, the API server runs over HTTPS by default. Verify that this is enabled in your cluster configuration. - Configure TLS Certificates: Ensure that the API server uses a valid TLS certificate for secure communication. In GKE, this is typically managed automatically. - Use Mutual TLS: For more robust authentication, configure mutual TLS between the API server and other components. You can use a certificate authority (CA) to issue certificates for each component and configure them for mutual authentication.
NEW QUESTION # 48
......
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