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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Application Environment, Configuration and Security | 25% | - Create and consume Secrets - Apply application security settings - Configure resource requirements, limits and quotas - Understand authentication, authorization and admission control - Use ServiceAccounts - Use custom resources and extensions - Work with ConfigMaps |
| Topic 2: Services and Networking | 20% | - Use Ingress rules - Understand and apply NetworkPolicies - Troubleshoot network access - Expose applications via Services |
| Topic 3: Application Deployment | 20% | - Use Helm package manager - Manage Deployments, rolling updates and rollbacks - Implement deployment strategies - Work with Kustomize |
| Topic 4: Application Observability and Maintenance | 15% | - Debug applications in Kubernetes - Monitor applications using CLI tools - Understand API deprecations - Work with container logs - Implement probes and health checks |
| Topic 5: Application Design and Build | 20% | - Understand multi-container Pod design patterns - Define, build and modify container images - Choose and use appropriate workload resources - Utilize persistent and ephemeral volumes |
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NEW QUESTION # 141 
Set Configuration Context:
[student@node-1] $ | kubectl
Config use-context k8s
Task
You have rolled out a new pod to your infrastructure and now you need to allow it to communicate with the web and storage pods but nothing else. Given the running pod kdsn00201 -newpod edit it to use a network policy that will allow it to send and receive traffic only to and from the web and storage pods.
Answer:
Explanation:
See the solution below.
Explanation:
To allow a pod to send and receive traffic only to and from specific pods, you can use network policies in Kubernetes.
First, you will need to create a network policy that defines the allowed traffic. You can create a network policy yaml file with the following rules:
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: newpod-network-policy
namespace: default
spec:
podSelector:
matchLabels:
app: kdsn00201-newpod
ingress:
- from:
- podSelector:
matchLabels:
app: web
- podSelector:
matchLabels:
app: storage
This policy will only allow incoming traffic to the pod with the label app=kdsn00201-newpod from pods with the label app=web or app=storage. If you have different labels on your web and storage pods please update the matchLabels accordingly.
Once you have created the network policy, you can apply it to the cluster by running the following command:
kubectl apply -f <network-policy-file>.yaml
This will apply the network policy to the cluster, and the newpod will only be able to send and receive traffic to and from the web and storage pods.
Please note that, NetworkPolicy resource is not available by default, you need to enable the NetworkPolicy feature on your Kubernetes cluster. This feature is enabled by default on some clusters and must be explicitly enabled on others. You can check if NetworkPolicy is available by running the command kubectl api-versions
| grep networking
Also, you need to ensure that the pods that you want to allow traffic to and from are running on the same namespace.
NEW QUESTION # 142
You have a Deployment named 'wordpress-deployment' that runs 3 replicas of a Wordpress container with the image 'wordpress:latest You need to ensure that wnen a new image is pusned to the Docker Hub repository 'my-wordpress-repo/wordpressaatest' , tne Deployment automatically updates to use the new image. Additionally, you need to set up a rolling update strategy where only one pod is updated at a time- The maximum number of unavailable pods at any given time should be 1.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Update the Deployment YAML.
- Add 'imagePuIIPoIicy: Always' to the container definition to ensure the deployment pulls the latest image from the Docker Hub repository even if a local copy exists.
- Set 'strategy-type: Rollingupdate' to enable a rolling update strategy.
- Configure 'strategy.rollingupdate.maxonavailable: I ' to allow only one pod to be unavailable during the update process.
- Set 'strategy-rollingUpdate.maxSurge: O' to restrict the number of pods added during the update to zero.
NEW QUESTION # 143
Context
Context
Developers occasionally need to submit pods that run periodically.
Task
Follow the steps below to create a pod that will start at a predetermined time and]which runs to completion only once each time it is started:
* Create a YAML formatted Kubernetes manifest /opt/KDPD00301/periodic.yaml that runs the following shell command: date in a single busybox container. The command should run every minute and must complete within 22 seconds or be terminated oy Kubernetes. The Cronjob namp and container name should both be hello
* Create the resource in the above manifest and verify that the job executes successfully at least once
Answer:
Explanation:
Solution:
NEW QUESTION # 144
Context
Context
A project that you are working on has a requirement for persistent data to be available.
Task
To facilitate this, perform the following tasks:
* Create a file on node sk8s-node-0 at /opt/KDSP00101/data/index.html with the content Acct=Finance
* Create a PersistentVolume named task-pv-volume using hostPath and allocate 1Gi to it, specifying that the volume is at /opt/KDSP00101/data on the cluster's node. The configuration should specify the access mode of ReadWriteOnce . It should define the StorageClass name exam for the PersistentVolume , which will be used to bind PersistentVolumeClaim requests to this PersistenetVolume.
* Create a PefsissentVolumeClaim named task-pv-claim that requests a volume of at least 100Mi and specifies an access mode of ReadWriteOnce
* Create a pod that uses the PersistentVolmeClaim as a volume with a label app: my-storage-app mounting the resulting volume to a mountPath /usr/share/nginx/html inside the pod
Answer:
Explanation:
Solution:
NEW QUESTION # 145
You are building a Kubernetes application that manages a fleet of autonomous vehicles. Each vehicle is represented by a custom resource called 'Vehicle'. You need to implement a CRD that defines the 'Vehicle' resource, including its required fields (like 'location', and 'status'), and ensures that the 'status' field can only be updated by the controller managing the vehicles.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define the Vehicle Custom Resource Definition (CRD):
- Create a YAML file named 'vehicle-crd-yaml with the following content:
2. create the CRD: - Apply the CRD definition using 'kubectl apply -f vehicle.crd.yaml'. 3. Validate the CRD: - Verity that the CRD is created successfully by running kubectl get crd vehicles-example.com'. 4. Create a Vehicle Resource: - Create a YAML file named 'vehicle-yamr with the following content:
5. Create the Vehicle Resource: - Apply the vehicle resource definition using 'kubectl apply -f vehicle-yamr 6. Verify the Vehicle Resource: - Ensure that the vehicle resource is created successfully by running 'kubectl get vehicles -n default 7. Update the 'status' Field: - Attempt to update tne 'status' field directly using 'kubectl patch vehicle vehicle-I -n default -p '{"spec": {"status": "driving"))" - Observe that the update fails because the 'status' field is considered immutable and can only be updated by the controller managing the vehicles. 8. Implement a Controller: - Create a controller that reads the 'Vehicles resources, updates the 'status' field based on the vehicle's state, and handles any errors. This controller should have read-only access to the 'spec' field and write access to the 'status' field. 9. Deploy the Controller: - Deploy the controller as a Deployment or a StatefulSet in Kubernetes- 10. IJpdate the 'status' Field through the Controller. - Trigger the controller to update the 'status' field of the 'vehicle-1' resource. - Verot that the 'status' field is updated successfully without violating the immutability rule. Key Points: - The CRD defines the 'Vehicle' resource schema and its required fields. - The 'status' field is marked as immutable to prevent direct updates by users- -A controller is responsible for updating the 'status' field based on the vehicle's state and ensuring data integrity. - This setup ensures that the 'status' field is always consistent and updated by the designated controller, maintaining data integrity and preventing accidental modifications.,
NEW QUESTION # 146
......
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