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| Section | Weight | Objectives |
|---|---|---|
| Services and Networking | 20% | - Troubleshoot network access - Understand and apply NetworkPolicies - Use Ingress rules - Expose applications via Services |
| Application Deployment | 20% | - Manage Deployments, rolling updates and rollbacks - Use Helm package manager - Implement deployment strategies - Work with Kustomize |
| Application Design and Build | 20% | - Define, build and modify container images - Understand multi-container Pod design patterns - Choose and use appropriate workload resources - Utilize persistent and ephemeral volumes |
| Application Observability and Maintenance | 15% | - Monitor applications using CLI tools - Debug applications in Kubernetes - Implement probes and health checks - Work with container logs - Understand API deprecations |
| Application Environment, Configuration and Security | 25% | - Create and consume Secrets - Understand authentication, authorization and admission control - Configure resource requirements, limits and quotas - Use ServiceAccounts - Use custom resources and extensions - Work with ConfigMaps - Apply application security settings |
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NEW QUESTION # 211 
Set Configuration Context:
[student@node-1] $ | kubectl
Config use-context k8s
Context
A pod is running on the cluster but it is not responding.
Task
The desired behavior is to have Kubemetes restart the pod when an endpoint returns an HTTP 500 on the
/healthz endpoint. The service, probe-pod, should never send traffic to the pod while it is failing. Please complete the following:
* The application has an endpoint, /started, that will indicate if it can accept traffic by returning an HTTP 200.
If the endpoint returns an HTTP 500, the application has not yet finished initialization.
* The application has another endpoint /healthz that will indicate if the application is still working as expected by returning an HTTP 200. If the endpoint returns an HTTP 500 the application is no longer responsive.
* Configure the probe-pod pod provided to use these endpoints
* The probes should use port 8080
Answer:
Explanation:
See the solution below.
Explanation:
Solution:
To have Kubernetes automatically restart a pod when an endpoint returns an HTTP 500 on the /healthz endpoint, you will need to configure liveness and readiness probes on the pod.
First, you will need to create a livenessProbe and a readinessProbe in the pod's definition yaml file. The livenessProbe will check the /healthz endpoint, and if it returns an HTTP 500, the pod will be restarted. The readinessProbe will check the /started endpoint, and if it returns an HTTP 500, the pod will not receive traffic.
Here's an example of how you can configure the liveness and readiness probes in the pod definition yaml file:
apiVersion: v1
kind: Pod
metadata:
name: probe-pod
spec:
containers:
- name: probe-pod
image: <image-name>
ports:
- containerPort: 8080
livenessProbe:
httpGet:
path: /healthz
port: 8080
initialDelaySeconds: 15
periodSeconds: 10
failureThreshold: 3
readinessProbe:
httpGet:
path: /started
port: 8080
initialDelaySeconds: 15
periodSeconds: 10
failureThreshold: 3
The httpGet specifies the endpoint to check and the port to use. The initialDelaySeconds is the amount of time the pod will wait before starting the probe. periodSeconds is the amount of time between each probe check, and the failureThreshold is the number of failed probes before the pod is considered unresponsive.
You can use kubectl to create the pod by running the following command:
kubectl apply -f <filename>.yaml
Once the pod is created, Kubernetes will start monitoring it using the configured liveness and readiness probes. If the /healthz endpoint returns an HTTP 500, the pod will be restarted. If the /started endpoint returns an HTTP 500, the pod will not receive traffic.
Please note that if the failure threshold is set to 3, it means that if the probe fails 3 times consecutively it will be considered as a failure.
The above configuration assumes that the application is running on port 8080 and the endpoints are available on the same port.
NEW QUESTION # 212
You are building a microservice application that consists of three components: a frontend service, a backend service, and a database service_ Each service is deployed as a separate pod in a Kubernetes cluster_ You need to implement health checks for each service to ensure that the application remains healthy and available. The frontend service should be able to reach both the backend service and the database service successfully. How would you implement health checks using Kustomize and ensure that the trontend service can only access the backend service and the database service within the cluster?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define Service Resources: Create separate Kubernetes Service resources for each component (frontend, backend, and database) using Kustomize.
2. Implement Health Checks: Add liveness and readiness probes to the containers in each pod's deployment configuration. This will ensure that the pods are continuously monitored for their health.
3. Configure Network Policy: Create a Network Policy to restrict communication between pods. This policy will allow the frontend service to communicate With the backend service and the database service, but prevent it from accessing other pods in the cluster.
4. Apply Configurations: Apply the Kustomize configurations using 'kuactl apply -k .s. This Will create the services, deployments, and network policy in your Kubernetes cluster. 5. Test Health Checks: Verify the health checks are working correctly by checking the pod status and using 'kubectl exec -it' to interact With the pods. You can also use tools like 'kubectl describe deployment' to see tne results of the probes. - If the health checks are not working, troubleshoot the issues by Checking logs, inspecting pod events, and ensuring the probes are configured correctly in the deployments. - You can also use 'kubectl logs to check for any error messages related to network connectivity or the health checks. - If you are experiencing network policy issues, ensure that the policy is correctly applied, and that there are no conflicts with other policies. 6. Monitor Application Health: use Kubernetes monitoring tools to track the health of your microservices and ensure that any issues are detected and resolved promptly. Tools like Prometheus and Grafana can be used to monitor the liveness and readiness probes, as well as other metrics related to your application's health. - Health Checks: The liveness and readiness probes in the deployments allow Kubernetes to continuously monitor the health of the pods- If a probe fails, Kubernetes Will restan the pod or mark it as unhealthy, preventing traffic from being routed to tne pod. - Network Policy: The Network Policy restricts communication between pods. In this example, it ensures that the frontend service can only communicate with the backend service and the database service. - Kustomize: Kustomize helps to simplify tne management of Kubernetes configurations. You can define common configurations and override them for specific deployments or environments using Kustomize. Note: Make sure to adapt the port numbers and labels in the configurations to match your application's setup. You may also need to adjust the initial delay, period, timeout, and failure thresholds for the probes based on the requirements ot your services. ,
NEW QUESTION # 213 
Task
You are required to create a pod that requests a certain amount of CPU and memory, so it gets scheduled to-a node that has those resources available.
* Create a pod named nginx-resources in the pod-resources namespace that requests a minimum of 200m CPU and 1Gi memory for its container
* The pod should use the nginx image
* The pod-resources namespace has already been created
Answer:
Explanation:
See the solution below.
Explanation:
Solution:
NEW QUESTION # 214 
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 # 215
You are developing a new application that requires access to multiple services running in different namespaces. To simplify the configuration and ensure that the application can easily discover these services, you want to use a ServiceAccount with a cluster-scoped Role that grants access to services across namespaces.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a ClusterRole:
- Create a ClusterRole that grants access to the required services in all namespaces
2. Create a ClusterR01e3inding: - Create a ClusterRole8inding to bind the ClusterRole to the ServiceAccount:
3. Create a ServiceAccount - Create a ServiceAccount in the namespace where the application is deployed:
4. Apply the Configuration: - Apply the ClusterRole, ClusterRoleBinding, and ServiceAccount using 'kL1bectl apply -f: bash kubectl apply -f access-services-cluster-role yaml kubectl apply -f access-services-cluster-role-binding.yaml kubectl apply -f my-app-sa.yaml 5. Configure the Application: - Ensure that the applications pod is using the created ServiceAccount
6. Test the Application: - Run the application and verify that it can successfully access the services in different namespaces. ,
NEW QUESTION # 216
......
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