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| Section | Objectives |
|---|---|
| Topic 1: Application Observability and Maintenance | - Understand probes and health checks - Monitor and troubleshoot applications |
| Topic 2: Application Environment, Configuration and Security | - Security contexts and service accounts - ConfigMaps and Secrets usage |
| Topic 3: State Persistence | - PersistentVolumes and PersistentVolumeClaims - Storage classes and volume mounting |
| Topic 4: Application Design and Build | - Understand Jobs and CronJobs - Define, build and modify container images - Understand multi-container Pod design patterns |
| Topic 5: Application Deployment | - Use Kubernetes primitives to implement deployments - Understand rolling updates and rollbacks |
| Topic 6: Services and Networking | - Services (ClusterIP, NodePort) - Pod networking concepts - Ingress basics |
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NEW QUESTION # 168
You have a Deployment named 'mysql-deployment running a MySQL database container. The 'mysql-deployment' has 2 replicas and you want to implement a blue-green deployment strategy for updating the database. The following steps need to be implemented:
- Create a new Deployment called 'mysql-deployment-new' with the updated MySQL image.
- Ensure that both deployments (old and new) are running concurrently.
- Route traffic to the 'mysql-deployment-new' deployment.
- Remove the old deployment ('mysql-deployment) once the traffic is switched over.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a new Deployment with updated image:
- Create a new Deployment named 'mysql-deployment-new' with the updated MySQL image. You can either create a new YAML tile or use 'kubectl create deployment' command.
- Ensure that the new deployment has the same number ot replicas as the old deployment.
2. Apply the new Deployment: - Apply the new Deployment YAML using 'kubectl apply -f mysql-deployment-new.yamr 3. Check Deployment status: - IJse ' kubectl get deployments' to verity that both deployments are running. You should see both 'mysql-deployment' and 'mysql-deployment-new' . 4. Update Service to use the new deployment: - Update the Service that is associated with the MySQL database to point to the new Deployment
- Apply the updated Service YAML using 'kubectl apply -f mysql-service-yamr 5. Verify traffic routing: - Test the application or services that rely on the MySQL database to ensure that the traffic is now being routed to the 'mysql-deployment-new' 6. Delete old Deployment: - Once you have verified that the traffic is successfully routed to the new Deployment, you can delete the old Deployment 'mysql-deployment' using 'kubectl delete deployment mysql-deployment'.]
NEW QUESTION # 169
You have a stateful set named 'mysql-statefulset' that runs a MySQL database. The database data is stored in a PersistentV01umeClaim (PVC) named 'mysql-pvc' _ You want to ensure that the PVC is always mounted to the same pod, even after a pod restart or replacement. Additionally, you want to configure the PVC to use a specific storage class tor data persistence.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Storage Class:
- Create a storage class YAML file with the desired storage class name and parameters, such as 'accessModes', 'reclaimPolicy' , and 'provisioner'.
- Apply the YAML file using 'kubectl apply -f mysql-storage.yaml' 2. Create a PersistentVolumeClaim: - Create a PVC YAML file With the storage class defined, and specify the storage size and access modes for the PVC.
- Apply the YAML file using 'kubectl apply -f mysql-pvc.yamr 3. Define the StatefulSet: - Update the 'mysql-statefulset' YAML file: - Set the 'spec-template-spec-containers-volumeMounts' to mount the 'mysql-pvc' volume to the container- - Define a 'spec-volumeClaimTemplates' section to define the volume claim associated with the StatefulSet.
- Apply the YAML file using 'kubectl apply -f mysql-statefulset.yamr 4. Verify the StatefulSet: - Check the status of the StatefulSet using 'kubectl get sts mysql-statefulset' - Use ' kubectl describe pod mysql-o' to verify that the 'mysql-pvc' is mounted to the pod and the storage class is being used 5. Test Pod Replacement: - Delete a pod within the StatefulSet (e.g., 'kubectl delete pod mysql-O'). - Observe that a new pod is automatically created witn the same name Cmysql-ff) and the 'mysql-pvc' is mounted to it. 6. Monitor the Database: - Connect to the MySQL database using the 'kubectl exec' command and verify that the data is preserved even after a pod restan or replacement. These steps ensure that your mysql-statefulset utilizes a specific storage class for data persistence and the PVC is always mounted to the same pod, providing consistent data access. ,
NEW QUESTION # 170
Context
Context
Your application's namespace requires a specific service account to be used.
Task
Update the app-a deployment in the production namespace to run as the restrictedservice service account. The service account has already been created.
Answer:
Explanation:
Solution:
NEW QUESTION # 171 
Context
It is always useful to look at the resources your applications are consuming in a cluster.
Task
* From the pods running in namespace cpu-stress , write the name only of the pod that is consuming the most CPU to file /opt/KDOBG030l/pod.txt, which has already been created.
Answer:
Explanation:
See the solution below.
Explanation
Solution:
NEW QUESTION # 172
You have a Kubernetes cluster with a namespace called 'dev' and a deployment named 'app-deployment' in that namespace. You need to create a new Role that allows users in the 'developers' group to only scale the Sapp-deployment' deployment. They should not be able to access any other resources in the 'dev' namespace. Implement the RBAC configuration for this scenario.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Role:
- Create a YAML file named 'scale-app-role.yaml' with the following content:
2. Create a RoleBinding: - Create a YAML file named 'scale-app-rolebinding.yaml' with the following content:
3. Apply the configuration: - Apply the Role and Role8inding using the following commands: bash kubectl apply -f scale-app-role.yaml kubectl apply -f scale-app-rolebinding-yaml 4. Verify the configuration: - You can verify the configuration by using the following command: bash kubectl auth can-i --list --as=user:testuser--group-developers--namespace-dev - Replace 'testuser' with the name of a user in the 'developers' group. The output should show only the following permissions: - 'apps/deployments': 'get, "list, 'watch', 'update', 'patch', 'scale' 5. Test the permissions: - Try to scale the Sapp-deployment deployment using the 'kubectr command as a user in the 'developers group. - Try to perform other actions on the deployment or other resources in the 'devs namespace. You should only be able to scale the Sapp-deployment deployment.
NEW QUESTION # 173
......
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