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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Storage | 10% | - StorageClasses and dynamic provisioning - Volume types and access modes - Persistent Volumes (PV) and Persistent Volume Claims (PVC) - StatefulSet storage configuration |
| Topic 2: Services & Networking | 20% | - Ingress resources and controllers - CoreDNS and service discovery - CNI configuration and troubleshooting - Network policies - Service types: ClusterIP, NodePort, LoadBalancer, ExternalName |
| Topic 3: Workloads & Scheduling | 15% | - Pod lifecycle, init containers, probes - Pod scheduling: node selector, affinity, taints/tolerations - Deployments, rolling updates and rollbacks - Configure applications with ConfigMaps and Secrets - Resource requests, limits and autoscaling |
| Topic 4: Troubleshooting | 30% | - Network connectivity and DNS resolution problems - Worker node issues and recovery - Log collection and analysis - Cluster component health checks - Control plane component failures - Pod and application failures |
| Topic 5: Cluster Architecture, Installation & Configuration | 25% | - Prepare infrastructure for cluster installation - Work with CRDs and Operators - Manage RBAC - Manage cluster lifecycle and upgrades - Create and manage clusters with kubeadm - Install components via Helm / Kustomize - Understand CNI, CSI, CRI interfaces - Implement high availability control plane |
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NEW QUESTION # 80
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 # 81
A bootstrap USB flash drive has been prepared using a Windows workstation to load the initial configuration of a Palo Alto Networks firewall that was previously being used in a lab. The USB flash drive was formatted using file system FAT32 and the initial configuration is stored in a file named init-cfg.txt. The firewall is currently running PAN-OS 10.0 and using a lab config. The contents of init-cgf.txt in the USB flash drive are as follows:
type=dhcp-client
Ip-address=
default-gateway=
netmask=
Ipv6-address=
Ipv6-default-gateway=
hostname=Ca-FW-DC1
panorama-server=10.5.107.20
panorama-server-2=10.5.107.21
tplname=FINANCE_TG4
dgname=finance_dg
dns-primary=10.5.6.6
dns-secondary=10.5.6.7
op-command-modes-multi-vsys.jumbo-frame
dhcp-send-hostname=yes
dhcp-send-client-id=yes
dhcp-accept-server-hostname=yes
dhcp-accept-server-domain=yes
The USB flash drive has been inserted in the firewalls' USB port, and the firewall has been restarted using command> request restart system Upon restart, the firewall fails to begin the bootstrapping process. The failure is caused because:
Answer: D
NEW QUESTION # 82
Create a pod with image nginx called nginx and allow traffic on port 80 See the solution below.
Answer:
Explanation:
kubectl run nginx --image=nginx --restart=Never --port=80
NEW QUESTION # 83
Create a pod that echo "hello world" and then exists. Have the pod deleted automatically when it's completed
Answer:
Explanation:
kubectl run busybox --image=busybox -it --rm --restart=Never --
/bin/sh -c 'echo hello world'
kubectl get po # You shouldn't see pod with the name "busybox"
NEW QUESTION # 84
Create a pod that echo "hello world" and then exists. Have the pod deleted automatically when it's completed
Answer:
Explanation:
kubectl run busybox --image=busybox -it --rm --restart=Never -- /bin/sh -c 'echo hello world' kubectl get po # You shouldn't see pod with the name "busybox"
NEW QUESTION # 85
......
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