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| Section | Weight | Objectives |
|---|---|---|
| Services and Networking | 20% | - Use Ingress rules - Troubleshoot network access - Expose applications via Services - Understand and apply NetworkPolicies |
| Application Deployment | 20% | - Implement deployment strategies - Use Helm package manager - Work with Kustomize - Manage Deployments, rolling updates and rollbacks |
| Application Observability and Maintenance | 15% | - Debug applications in Kubernetes - Monitor applications using CLI tools - Work with container logs - Understand API deprecations - Implement probes and health checks |
| Application Environment, Configuration and Security | 25% | - Understand authentication, authorization and admission control - Use custom resources and extensions - Create and consume Secrets - Use ServiceAccounts - Configure resource requirements, limits and quotas - Work with ConfigMaps - Apply application security settings |
| Application Design and Build | 20% | - Utilize persistent and ephemeral volumes - Define, build and modify container images - Choose and use appropriate workload resources - Understand multi-container Pod design patterns |
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NEW QUESTION # 105 
Task:
Update the Pod ckad00018-newpod in the ckad00018 namespace to use a NetworkPolicy allowing the Pod to send and receive traffic only to and from the pods web and db
Answer:
Explanation:
See the solution below.
Explanation:
Solution:
NEW QUESTION # 106
You are tasked Witn designing a multi-container Pod tnat nosts botn a web server and a database. The web server should be able to connect to the database within the pod- How would you implement this design, including networking considerations?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define the Pod YAMI-: Create a Pod definition that includes two containers: one tor the web server and one for the database.
2. Configure Networking: The key to allowing the web server to connect to the database is to use the pod's internal network. Since containers Within a pod share the same network namespace, you can configure the webserver to connect to the database using the name "db". 3. Environment Variables: Set an environment variable CDB HOST') within the webserver container to point to the database container by its name. This ensures the web server can correctly connect to the database within the pod. 4. Pod Deployment: Apply the YAML to create the pod using 'kubectl apply -f web-db-pod.yamr. 5. Verification: To check the pod's status: - Run 'kubectl get pods' - Check the logs of the web server container to confirm it can connect to the database. 6. Important Note: In this example, we're using the default pod networking within Kubernetes. For more complex applications, consider using a service to expose the database container This will allow access to the database from outside the pod.,
NEW QUESTION # 107
Refer to Exhibit.
Set Configuration Context:
[student@node-1] $ | kubectl
Config use-context k8s
Context
A container within the poller pod is hard-coded to connect the nginxsvc service on port 90 . As this port changes to 5050 an additional container needs to be added to the poller pod which adapts the container to connect to this new port. This should be realized as an ambassador container within the pod.
Task
* Update the nginxsvc service to serve on port 5050.
* Add an HAproxy container named haproxy bound to port 90 to the poller pod and deploy the enhanced pod. Use the image haproxy and inject the configuration located at /opt/KDMC00101/haproxy.cfg, with a ConfigMap named haproxy-config, mounted into the container so that haproxy.cfg is available at /usr/local/etc/haproxy/haproxy.cfg. Ensure that you update the args of the poller container to connect to localhost instead of nginxsvc so that the connection is correctly proxied to the new service endpoint. You must not modify the port of the endpoint in poller's args . The spec file used to create the initial poller pod is available in /opt/KDMC00101/poller.yaml
Answer:
Explanation:
Solution:
To update the nginxsvc service to serve on port 5050, you will need to edit the service's definition yaml file. You can use the kubectl edit command to edit the service in place.
kubectl edit svc nginxsvc
This will open the service definition yaml file in your default editor. Change the targetPort of the service to 5050 and save the file.
To add an HAproxy container named haproxy bound to port 90 to the poller pod, you will need to edit the pod's definition yaml file located at /opt/KDMC00101/poller.yaml.
You can add a new container to the pod's definition yaml file, with the following configuration:
containers:
- name: haproxy
image: haproxy
ports:
- containerPort: 90
volumeMounts:
- name: haproxy-config
mountPath: /usr/local/etc/haproxy/haproxy.cfg
subPath: haproxy.cfg
args: ["haproxy", "-f", "/usr/local/etc/haproxy/haproxy.cfg"]
This will add the HAproxy container to the pod and configure it to listen on port 90. It will also mount the ConfigMap haproxy-config to the container, so that haproxy.cfg is available at /usr/local/etc/haproxy/haproxy.cfg.
To inject the configuration located at /opt/KDMC00101/haproxy.cfg to the container, you will need to create a ConfigMap using the following command:
kubectl create configmap haproxy-config --from-file=/opt/KDMC00101/haproxy.cfg You will also need to update the args of the poller container so that it connects to localhost instead of nginxsvc. You can do this by editing the pod's definition yaml file and changing the args field to args: ["poller","--host=localhost"].
Once you have made these changes, you can deploy the updated pod to the cluster by running the following command:
kubectl apply -f /opt/KDMC00101/poller.yaml
This will deploy the enhanced pod with the HAproxy container to the cluster. The HAproxy container will listen on port 90 and proxy connections to the nginxsvc service on port 5050. The poller container will connect to localhost instead of nginxsvc, so that the connection is correctly proxied to the new service endpoint.
Please note that, this is a basic example and you may need to tweak the haproxy.cfg file and the args based on your use case.
NEW QUESTION # 108
You are managing a Kubernetes cluster with multiple teams working on different projects. Each team needs its own isolated environment within the cluster to deploy tneir applications and manage their resources witnout interfering With others. Describe how you would use Kubernetes namespaces to achieve this, and provide an example of how you might configure a namespace for a team working on a new e-commerce application.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create Namespaces for Teams: use 'kubectl create namespace command to create namespaces for each team. For example, 'kubectl create namespace ecom-team'.
2. Configure Resource Quotas: Set resource limits for each namespace using 'kubectl create -f command. This prevents one team from consuming all the resources available on the cluster Heres a sample resource quota file:
3. Apply Role-Based Access Control (RBAC): IJse 'kubectl create -f ' command to define role bindings for each team. This allows you to control the actions that each team can perform within their namespace. Here's a sample role binding file:
4. Create Resources within the Namespace: Deploy your applications and other resources within the dedicated namespace for the e-commerce team. For example, you can deploy a 'Deployment Witn the following configuration:
5. Verify Namespace Configuration: IJse 'kubectl get namespaces' to list all namespaces, and 'kubectl describe namespace to view details of a specific namespace. 6. Manage Namespace Access: You can use tools like 'kubectl' or a graphical user interface (GIJI) to manage the access rights and resources within each namespace. 7. Cleanup: When a team no longer needs a specific namespace, you can delete it using 'kubectl delete namespace '.
NEW QUESTION # 109
You have a stateful application that requires persistent storage. You need to create a PersistentV01umeClaim (PVC) that Will be used by a Deployment to store application dat a. The PVC should have the following specifications:
- Access Modes: ReadWriteOnce
- Storage Class: 'fast-storage
- Storage Size: IOGi
Provide the YAML code for creating this PVC.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. create the PVC YAML file:
2. Apply the PVC YAML using kubectl: bash kubectl apply -f my-pvc.yaml 3. Verify the PVC creatiom bash kubectl get pvc You should see the PVC ' my-pvc' listed with the specified access mode, storage class, and size.,
NEW QUESTION # 110
......
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