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| Section | Objectives |
|---|---|
| State Persistence | - Storage classes and volume mounting - PersistentVolumes and PersistentVolumeClaims |
| Application Observability and Maintenance | - Understand probes and health checks - Monitor and troubleshoot applications |
| Services and Networking | - Ingress basics - Pod networking concepts - Services (ClusterIP, NodePort) |
| Application Design and Build | - Understand Jobs and CronJobs - Define, build and modify container images - Understand multi-container Pod design patterns |
| Application Environment, Configuration and Security | - Security contexts and service accounts - ConfigMaps and Secrets usage |
| Application Deployment | - Understand rolling updates and rollbacks - Use Kubernetes primitives to implement deployments |
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NEW QUESTION # 151 
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 # 152
Exhibit:
Context
A user has reported an aopticauon is unteachable due to a failing livenessProbe .
Task
Perform the following tasks:
* Find the broken pod and store its name and namespace to /opt/KDOB00401/broken.txt in the format:
The output file has already been created
* Store the associated error events to a file /opt/KDOB00401/error.txt, The output file has already been created. You will need to use the -o wide output specifier with your command
* Fix the issue.
Answer: A
NEW QUESTION # 153
You're building a microservice architecture that uses a load balancer to distribute traffic across multiple instances of a service. You want to implement a health check mechanism that ensures only healthy instances receive traffic. Design a solution using Kubernetes Liveness probes and a service With a health check configuration.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define a Liveness Probe in the Deployment:
- Replace 'my-service-image:latest' with your service image. - Replace '8080' with the port your service listens on. - Adjust the probe settings as needed. 2. Create a Service with Health Check Configuration:
- 'healthCheckNodePort' is optional, but can be used for external health checks against the service. 3. Apply the YAML Files: - Apply the Deployment and Service using 'kubectl apply -f deployment_yamr and ' kubectl apply -f service.yaml'. 4. Verify the Health Checks: - Check the service logs for liveness probe results. - If a pod becomes unhealthy, it should be restarted by the liveness probe. - You can also use 'kubectl get pods -I app=my-service' to check the pod status. 5. Advanced Configuration: - Use 'exec' or 'httpGet' probes for more complex health check requirements. - Configure the 'failureThreshold' and "successThreshold' to adjust the probe's sensitivity. - Add a 'readinessProbe' to the Deployment for readiness checks that determine when a pod is ready to receive traffic. ,
NEW QUESTION # 154
Context
Anytime a team needs to run a container on Kubernetes they will need to define a pod within which to run the container.
Task
Please complete the following:
* Create a YAML formatted pod manifest
/opt/KDPD00101/podl.yml to create a pod named app1 that runs a container named app1cont using image Ifccncf/arg-output with these command line arguments: -lines 56 -F
* Create the pod with the kubect1 command using the YAML file created in the previous step
* When the pod is running display summary data about the pod in JSON format using the kubect1 command and redirect the output to a file named /opt/KDPD00101/out1.json
* All of the files you need to work with have been created, empty, for your convenience
Answer:
Explanation:
See the solution below.
Explanation
Solution:
NEW QUESTION # 155
You have a Deployment that runs a critical service with 5 replicas. You need to update the service with a new image, but you want to ensure that only one replica is unavailable at a time during the update process. You also want to control how long the update process can take. How would you implement this using the 'rollinglJpdate' strategy?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Update the Deployment YAMLI
- Set 'strategy.type' to 'RollingLJpdate'
- Configure 'strategy.rollingupdate.maxunavailable' to 'I' to limit the number of unavailable replicas during the update.
- Set 'strategy-rollinglJpdate.maxSurge' to to allow for a maximum of six replicas during the update process.
2. Control Update Duration (Optional): - Optionally, you can use 'strategy-rollingUpdate.partition' to control the number of pods updated at a time. This allows you to slow down the update process by updating fewer pods at once- For example, setting 'partition' to ' 2' would update only two pods at a time.
3. Create or IJpdate the Deployment: - Apply the updated YAML file using 'kubectl apply -f my-critical-service-deployment.yaml' 4. Trigger the Update: - Update the image of your application to a newer version. - You can trigger the update by pushing a new image to your container registry. 5. Monitor the Update: - Use 'kubectl get pods -I app=my-critical-service to monitor the pod updates during the rolling update process. - Observe the pods being updated one at a time, ensuring that there's always at least four replicas available. 6. Check for Successful Update: - Once the update is complete, use 'kubectl describe deployment my-critical-service' to verify that the 'updatedReplicaS field matches the 'replicas' field.,
NEW QUESTION # 156
......
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