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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Services & Networking | 20% | - Network policies - Services (ClusterIP, NodePort, LoadBalancer) - Ingress configuration |
| Topic 2: Troubleshooting | 30% | - Application and networking debugging - Cluster component troubleshooting |
| Topic 3: Workloads & Scheduling | 15% | - Deployments and rolling updates - Scheduling constraints - ConfigMaps and Secrets |
| Topic 4: Cluster Architecture, Installation & Configuration | 25% | - Cluster installation and configuration - High availability setup - Kubernetes architecture components |
| Topic 5: Storage | 10% | - PersistentVolumes and PersistentVolumeClaims - Storage classes |
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NEW QUESTION # 60
Score: 4%
Task
Create a pod named kucc8 with a single app container for each of the following images running inside (there may be between 1 and 4 images specified): nginx + redis + memcached .
Answer:
Explanation:
Solution:
kubectl run kucc8 --image=nginx --dry-run -o yaml > kucc8.yaml
# vi kucc8.yaml
apiVersion: v1
kind: Pod
metadata:
creationTimestamp: null
name: kucc8
spec:
containers:
- image: nginx
name: nginx
- image: redis
name: redis
- image: memcached
name: memcached
- image: consul
name: consul
#
kubectl create -f kucc8.yaml
#12.07
NEW QUESTION # 61
Get list of all the pods showing name and namespace with a jsonpath expression.
Answer:
Explanation:
kubectl get pods -o=jsonpath="{.items[*]['metadata.name' , 'metadata.namespace']}"
NEW QUESTION # 62
Given a partially-functioning Kubernetes cluster, identify symptoms of failure on the cluster.
Determine the node, the failing service, and take actions to bring up the failed service and restore the health of the cluster. Ensure that any changes are made permanently.
You can ssh to the relevant I nodes (
[student@node-1] $ ssh <nodename
You can assume elevated privileges on any node in the cluster with the following command:
[student@nodename] $ | sudo -i
Answer:
Explanation:
See the solution below.
Explanation
solution
F:\Work\Data Entry Work\Data Entry\20200827\CKA\23 C.JPG
F:\Work\Data Entry Work\Data Entry\20200827\CKA\23 D.JPG
F:\Work\Data Entry Work\Data Entry\20200827\CKA\23 E.JPG
NEW QUESTION # 63
Task Weight: 4%
Task
Scale the deployment webserver to 3 pods.
Answer:
Explanation:
Solution:
NEW QUESTION # 64
A Deployment named 'my-app-deployment' is experiencing frequent crashes. You suspect that a specific container within the Deployment is causing the crashes. How would you use Kubernetes tools and techniques to isolate and debug the problematic container?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Examine Pod Logs:
- Use "kubectl logs ' (where is the name of a crashing pod) to examine the logs from all containers within the pod. Look for error messages, unusual patterns, or indications of failing processes.
- Analyze the log messages carefully to identify which container is likely causing the crashes.
2. Investigate Pod Events:
- Use "kubectl describe pod ' to view the pod's events.
- Look for events that might indicate a specific container is crashing or encountering issues during startup. Events will include timestamps and reasons for the events.
3. Check Container Resource Limits:
- Use 'kubectl describe pod to check the resource requests and limits defined for each container within the pod.
- If the limits are too low, the containers might be being throttled or running out of resources, leading to crashes.
4. Use a Debugger:
- If you have access to the application code and a debugger (like a remote debugger in your development environment), you can attach to the problematic container to get more detailed information about its state and execution.
- Use the 'kubectl exec' command to access a container's shell, and then run the debugger.
5. Consider Health Checks:
- Ensure that the containers have proper health checks defined (e.g., liveness probes or readiness probes).
- Health checks can help Kubernetes identify failing containers and restart them or remove them from service.
6. Isolate the Container:
- If you suspect that the container itself is faulty, try isolating it by temporarily disabling the problematic container from the pod. You can do this by either:
- Removing the container from the Pod definition: Temporarily modify the Deployment to remove the problematic container.
- Stopping the container: Use 'kubectl exec' to access the pod's shell, and then stop the container.
7. Monitor and Repeat:
- After isolating the container, monitor the Deployment to see if the crashes stop.
- If the crashes are resolved, the isolated container was likely the cause. You can then focus on troubleshooting the container itself.
NEW QUESTION # 65
......
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