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| Section | Weight | Objectives |
|---|---|---|
| Troubleshooting | 30% | - Cluster component troubleshooting - Application and networking debugging |
| Storage | 10% | - Storage classes - PersistentVolumes and PersistentVolumeClaims |
| Workloads & Scheduling | 15% | - Scheduling constraints - ConfigMaps and Secrets - Deployments and rolling updates |
| Services & Networking | 20% | - Ingress configuration - Services (ClusterIP, NodePort, LoadBalancer) - Network policies |
| Cluster Architecture, Installation & Configuration | 25% | - Cluster installation and configuration - High availability setup - Kubernetes architecture components |
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NEW QUESTION # 37
You have a Kubernetes cluster with two worker nodes and a single Nginx service deployed. You want to expose this service externally using a LoadBalancer service type but only want traffic to be directed to pods on a specific worker node. How would you achieve this?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Node Selector:
- Create a Node Selector label on the worker node where you want to host the Nginx pods.
- Example:
- Apply this configuration using 'kubectl apply -f node-config.yaml'. 2. Configure the Deployment: - Update the Nginx deployment to include the Node Selector label in its pod template. - Example:
- Apply the updated deployment configuration using 'kubectl apply -f nginx-deployment.yamr. 3. Create a LoadBalancer Service: - Create a LoadBalancer type service that selects the Nginx pods with the 'app=nginx' label. - Example:
- Apply the service configuration using 'kubectl apply -f nginx-service.yamP. 4. Verify the Deployment: - Confirm the deployment of the Nginx pods on the specified worker node using 'kubectl get pods -l app=nginx -o wide'. - Check the LoadBalancer service's external IP address using 'kubectl get services nginx-service'. - Access the Nginx service using the external IP address. All traffic should be routed to the pods on the worker node with the 'worker-type: nginx' label. ---
NEW QUESTION # 38
Kubernetes. The microservices communicate with each other via a shared database. Explain how you would implement a strategy to manage persistent data in the database, ensuring availability and scalability for all microservices.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Use a Database with High Availability:
- Select a database system that supports high availability, such as MySQL with Galera or PostgreSQL with Patroni. These database systems can replicate data across multiple nodes, providing fault tolerance and scalability.
2. Deploy the Database as a StatefulSet:
- Create a StatefulSet for your database deployment, ensuring that each pod is assigned a unique name and volume claim. This will ensure that the database data is preserved even if pods are restarted or deleted.
3. Implement Persistent Volumes and Claims:
- Define PersistentVolumeClaims (PVCs) for each database node, requesting a storage class that provides the desired performance and resilience.
- Create corresponding PersistentVolumes (PVs) to back these PVCs, ensuring sufficient capacity and appropriate access modes.
4. Configure Microservice Pods to Access the Database:
- Configure each microservice pod to access the database using the StatefulSet's service name or a dedicated database service.
5. Utilize a Service Mesh:
- Consider deploying a service mesh like Istio to manage communication between microservices and the database. A service mesh provides features like load balancing, service discovery, and security, simplifying communication management.
6. Implement Monitoring and Alerting:
- Monitor the health and performance of both the database and microservices to quickly detect and resolve any issues. Configure alerts to notify you of critical events or failures.
7. Scale the Database as Needed:
- Use horizontal pod autoscaling (HPA) to automatically scale the database deployment based on its load. This ensures that the database can handle increasing traffic.
NEW QUESTION # 39
Scale the deployment to 5 replicas
Answer:
Explanation:
kubectl scale deployment webapp -replicas=5 //Verify kubectl get deploy kubectl get po,rs
NEW QUESTION # 40
List all the pods showing name and namespace with a json path expression
Answer:
Explanation:
kubectl get pods -o=jsonpath="{.items[*]['metadata.name',
'metadata.namespace']}"
NEW QUESTION # 41
Describe the difference between 'ReadWriteOnce' and access modes for PersistentVolumeClaims. In what scenarios would you choose each?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
ReadWriteOnce:
- Description: This mode allows only one pod to mount the volume at a time.
- Scenarios: Ideal for applications requiring exclusive access to the storage, such as databases where data integrity is crucial. Examples include:
- Single-instance databases (e.g., MySQL, PostgreSQL)
- Applications that modify files concurrently and need to ensure consistency.
ReadWriteMany:
- Description: This mode allows multiple pods to mount the volume simultaneously.
- Scenarios: Suitable for applications that need shared access to data, such as shared storage for applications, I configuration files, or log files. Examples include:
- Shared file systems (e.g., NFS, GlusterFS)
- Applications where multiple pods need to access the same data simultaneously.
NEW QUESTION # 42
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