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Linux Foundation Certified Kubernetes Security Specialist (CKS) Sample Questions (Q86-Q91):

NEW QUESTION # 86
Cluster: scanner Master node: controlplane Worker node: worker1
You can switch the cluster/configuration context using the following command:
[desk@cli] $ kubectl config use-context scanner
Given: You may use Trivy's documentation.
Task: Use the Trivy open-source container scanner to detect images with severe vulnerabilities used by Pods in the namespace nato.
Look for images with High or Critical severity vulnerabilities and delete the Pods that use those images. Trivy is pre-installed on the cluster's master node. Use cluster's master node to use Trivy.

Answer:

Explanation:

NEW QUESTION # 87
Your Kubernetes cluster iS running a web application that requires access to a database hosted on an external Cloud provider. Describe how you can secure the connection between the application and the database using TLS/SSL encryption and identity-based authentication.

Answer:

Explanation:
Solution (Step by Step) :
1. Configure TLS/SSL Encryption:
- Generate Certificate: Obtain a TLS/SSL certificate from a trusted certificate authority (CA) or use a self-signed certificate for development purposes-
- Install Certificate on Database Server: Install the certificate on the database server, making it available to the database service.
- Configure Database Service: Configure the database service to accept connections only over TLS/SSL.
- Configure Application Container:
- Mount Certificate: Mount the TLS/SSL certificate into the application container as a secret.
- Configure Application Code: Update the application code to use the certificate when connecting to the database.
2. Implement Identity-Based Authentication:
- Create Database User: Create a dedicated database user specifically for the web application.
- Grant Permissions: Grant appropriate permissions to the database user, limiting access to the necessary tables and data.
- Use Authentication Plugin: Configure the database service to use an authentication plugin that supports identity-based authentication.
- Generate Database Credentials: Generate database credentials (usemame and password) for the application.
- Store Credentials Secretly: Store the database credentials securely as a Kubernetes secret.
- Access Credentials from Application: Configure the application to access the database credentials from the secret.
3. Connect Application to Database:
- Configure Connection String: Update the application's connection string to use TLS/SSL and the database user credentials.
- Example Connection String:
jdbc:postgresql://database-host:5432/database-name?ssl=true&sslmode=require&user=app user&password=app-password
4. Security Considerations:
- Certificate Validation: Ensure the certificate is validated by the application to prevent man-in-the-middle attacks.
- Secure Credential Management: Implement strong security measures to protect the database credentials stored as secrets.
- Access Control: Limit access to the database to only authorized users and applications.
- Network Isolatiom Consider using network policies to isolate the web application from other workloads and restrict unnecessary network traffic.

NEW QUESTION # 88
Create a new ServiceAccount named backend-sa in the existing namespace default, which has the capability to list the pods inside the namespace default.
Create a new Pod named backend-pod in the namespace default, mount the newly created sa backend-sa to the pod, and Verify that the pod is able to list pods.
Ensure that the Pod is running.

Answer:

Explanation:
A service account provides an identity for processes that run in a Pod.
When you (a human) access the cluster (for example, using kubectl), you are authenticated by the apiserver as a particular User Account (currently this is usually admin, unless your cluster administrator has customized your cluster). Processes in containers inside pods can also contact the apiserver. When they do, they are authenticated as a particular Service Account (for example, default).
When you create a pod, if you do not specify a service account, it is automatically assigned the default service account in the same namespace. If you get the raw json or yaml for a pod you have created (for example, kubectl get pods/<podname> -o yaml), you can see the spec.serviceAccountName field has been automatically set.
You can access the API from inside a pod using automatically mounted service account credentials, as described in Accessing the Cluster. The API permissions of the service account depend on the authorization plugin and policy in use.
In version 1.6+, you can opt out of automounting API credentials for a service account by setting automountServiceAccountToken: false on the service account:
apiVersion: v1
kind: ServiceAccount
metadata:
name: build-robot
automountServiceAccountToken: false
...
In version 1.6+, you can also opt out of automounting API credentials for a particular pod:
apiVersion: v1
kind: Pod
metadata:
name: my-pod
spec:
serviceAccountName: build-robot
automountServiceAccountToken: false
...
The pod spec takes precedence over the service account if both specify a automountServiceAccountToken value.

NEW QUESTION # 89
You are managing a Kubernetes cluster for a critical application. The cluster is exposed to the internet and uses a service account with default permissions- You need to implement a security strategy that limits the privileges of the service account to only the necessary permissions to run the application.

Answer:

Explanation:
Solution (Step by Step):
1. Identify Necessary Permissions: Analyze the application's requirements to identify the minimal permissions required by the service account. This might include access to specific resources, such as pods, services, and config maps.
2. Create a Custom Role: Define a custom role using Role or ClusterRole in Kubernetes-
- Create a YAML file for the Custom Role:

3. Bind the Role to Service Account Create a ROIeBinding or ClusterR01eBinding to associate tne custom role witn the service account.

4. Deploy the Role and ROIeBinding: Apply the YAML files using 'kubectl apply -f role.yaml and 'kubectl apply -f rolebinding.yamr Note: This is a basic example. You might need to refine the permissions based on your application's specific requirements.

NEW QUESTION # 90
You are running a Kubernetes cluster with several sensitive applications. You need to restrict access to the cluster from external sources to only the IP addresses of your development team's laptops. HOW can you implement this using Network Policies?

Answer:

Explanation:
Solution (Step by Step) :
1. Define Network Policy: Create a NetworkPolicy YAML file named 'restrict-external-access.yaml

- Replace with the namespace where your sensitive applications are deployed. - Replace with the IP range of your development team's laptops. For example, '192.168.1.0/24' or a specific set of IP addresses. 2. Apply Network Policy: use 'kubectl' to apply the NetworkPolicy to your Kubernetes cluster. bash kubectl apply -f restrict-external-access-yaml 3. Verify Network Policy: Verify the NetworkPolicy is applied correctly: bash kubectl get networkpolicies -n You should see the 'restrict-external-access NetworkPolicy listed. 4. Test Access: Try accessing the cluster from an external IP address outside of the defined range. You should be blocked. Access from within the defined IP range should be allowed. This NetworkP01icy restricts ingress traffic to pods Within the specified namespace. It allows connections from the specified IP range C') and blocks all other external connections. Important Note: Ensure your firewall and other network security measures are properly configured to work in conjunction with the NetworkPolicy.

NEW QUESTION # 91
......

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