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| Section | Weight | Objectives |
|---|---|---|
| Services & Networking | 20% | - Ingress configuration - Services (ClusterIP, NodePort, LoadBalancer) - Network policies |
| Troubleshooting | 30% | - Application and networking debugging - Cluster component troubleshooting |
| Workloads & Scheduling | 15% | - Deployments and rolling updates - Scheduling constraints - ConfigMaps and Secrets |
| Cluster Architecture, Installation & Configuration | 25% | - High availability setup - Cluster installation and configuration - Kubernetes architecture components |
| Storage | 10% | - PersistentVolumes and PersistentVolumeClaims - Storage classes |
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NEW QUESTION # 24
Create the service as type NodePort with the port 32767 for the nginx pod with the pod selector app: my-nginx
Answer:
Explanation:
kubectl run nginx --image=nginx --restart=Never -- labels=app=nginx --port=80 --dry-run -o yaml > nginx-pod.yaml
NEW QUESTION # 25
You have a Kubernetes cluster with a multi-tenant setup where different teams manage their own applications. You need to enforce a policy where only developers from the "engineering" team can create deployments for applications within the "dev" namespace. How would you implement this using RBAC?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
Step 1: Create a Role for the "engineering" team
Step 2: Create a RoleBinding to assign the role to the "engineering" team
- The Role defines the permissions for the "engineering" team, allowing them to create deployments in the "dev" namespace. - The RoleBinding associates the "engineering-role" with the user "john.doe@example.com" (representing a developer from the "engineering" team). Step 3: Validate the setup - A developer from the "engineering" team should be able to create deployments in the "dev" namespace. - Other users or teams without the appropriate permissions should be prevented from creating deployments in the "dev" namespace.
NEW QUESTION # 26
You have a Deployment running a web application with three replicas. The application is exposed using a 'NodePort' service. You need to configure the service so that it allows traffic only from specific IP addresses (e.g., 192.168.1.10, 192.168.1.20).
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a NetworkPolicy:
- Define a NetworkPolicy resource that allows traffic from the specified IP addresses to the Deployment pods.
2. Apply the NetworkPolicy: - Apply the YAML file using 'kubectl apply -f networkpolicy.yaml'. 3. Verify the NetworkPolicy: - Check the status of the NetworkPolicy using 'kubectl get networkpolicies allow-specific-ips -n 4. Test the Access: - Attempt to access the web application from the allowed IP addresses. You should be able to access it. - Try to access the application from other IP addresses. You should not be able to access it. Note: Replace " with the actual namespace where your Deployment and NetworkPolicy are located.
NEW QUESTION # 27
Watch the job that runs 10 times one by one and verify 10 pods are created and delete those after it's completed
Answer:
Explanation:
kubectl get job -w kubectl get po kubectl delete job hello-job
NEW QUESTION # 28
You have a deployment that uses a PersistentVolumeClaim for its storage. The deployment is scaled to 5 replicas. You notice that each pod is using the same volume, leading to data corruption. Explain why this is happening and how you can fix the problem.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
This problem arises because the access mode of the PersistentVolumeClaim is set to 'ReadWriteMany', and the PVC is shared between all pods. When multiple pods access the same data simultaneously, data corruption can occur due to inconsistent updates. To fix the issue, you need to change the PVC access mode to 'ReadWriteOnce' and create individual PVCs for each pod. Here's how:
1. Update the PVC Access Mode:
- Modify the access mode in the PersistentVolumeClaim YAML file to 'ReadWriteOnce'.
2. Update the Deployment to use Multiple PVCs: - Update the Deployment YAML to use a unique PVC for each pod by specifying the 'persistentVolumeClaim' field in the 'spec.template.spec.containers.volumeMounts' section.
3. Apply the Changes: - Apply the updated PVC and Deployment YAML files using 'kubectl apply -f my-pvc.yaml' and "kubectl apply -f my-deployment.yaml' , respectively. - By setting the PVC access mode to 'ReadWriteOnce', each pod can access the volume exclusively. - The updated Deployment definition ensures that each pod has a unique PersistentVolumeClaim. The 'claimName' field in the volumes' section uses the 'pod.metadata.name' to create a unique name for each PVC. This ensures that each pod has its own dedicated storage, preventing data corruption and ensuring data consistency.]
NEW QUESTION # 29
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