Linux Foundation CKAD Exam With Confidence Using Practice Dumps

To find the broken pod and store its name and namespace to /opt/KDOB00401/broken.txt, you can use the kubectl get pods command and filter the output by the status of the pod.

kubectl get pods --field-selector=status.phase=Failed -o jsonpath='{.items[*].metadata.namespace}/{.items[*].metadata.name}' > /opt/KDOB00401/broken.txt

This command will list all pods with a status of Failed and output their names and namespaces in the format /. The output is then written to the /opt/KDOB00401/broken.txt file.

To store the associated error events to a file /opt/KDOB00401/error.txt, you can use the kubectl describe command to retrieve detailed information about the pod, and the grep command to filter the output for error events.

kubectl describe pods --namespace | grep -i error -B5 -A5 > /opt/KDOB00401/error.txt

Replace and with the name and namespace of the broken pod you found in the previous step.

This command will output detailed information about the pod, including error events. The grep command filters the output for lines containing "error" and also prints 5 lines before and after the match.

To fix the issue, you need to analyze the error events and find the root cause of the issue.

It could be that the application inside the pod is not running, the container image is not available, the pod has not enough resources, or the liveness probe configuration is incorrect.

Once you have identified the cause, you can take appropriate action, such as restarting the application, updating the container image, increasing the resources, or modifying the liveness probe configuration.

After fixing the issue, you can use the kubectl get pods command to check the status of the pod and ensure

Goal: fix nosql Deployment in haddock so the container stops OOM’ing by setting:

memory request = 128Mi

memory limit = half of the namespace’s maximum memory constraint

You must do this on the correct host.

0) Connect to the correct host

ssh ckad00032

1) Confirm the failing Deployment / Pods

kubectl -n haddock get deploy nosql

kubectl -n haddock get pods -l app=nosql 2>/dev/null || kubectl -n haddock get pods

If pods are crashing, check why (you’ll likely see OOMKilled):

kubectl -n haddock describe pod

2) Find the maximum memory constraint set for the haddock namespace

In CKAD labs, this is commonly enforced by a LimitRange (max memory per container). Sometimes it can also be a ResourceQuota.

2A) Check LimitRange (most likely)

kubectl -n haddock get limitrange

kubectl -n haddock get limitrange -o yaml

Extract the max memory value quickly:

MAX_MEM=$(kubectl -n haddock get limitrange -o jsonpath='{.items[0].spec.limits[0].max.memory}')

echo "Namespace max memory constraint: $MAX_MEM"

2B) If no LimitRange exists, check ResourceQuota

kubectl -n haddock get resourcequota

kubectl -n haddock describe resourcequota

If quota is used, you’re looking for something like limits.memory (but the question wording “maximum memory constraint” usually points to LimitRange max.memory).

3) Compute “half of the max memory constraint”

Run this small snippet to compute HALF in Mi (handles Mi and Gi):

HALF_MEM=$(python3 - <<'PY'

import os, re

q = os.environ.get("MAX_MEM","").strip()

m = re.fullmatch(r"(\d+)(Mi|Gi)", q)

if not m:

raise SystemExit(f"Cannot parse MAX_MEM='{q}'. Expected like 512Mi or 1Gi.")

val = int(m.group(1))

unit = m.group(2)

# convert to Mi

mi = val if unit == "Mi" else val * 1024

half_mi = mi // 2

print(f"{half_mi}Mi")

PY

)

echo "Half of max: $HALF_MEM"

Example: if MAX_MEM=512Mi → HALF_MEM=256Mi

Example: if MAX_MEM=1Gi → HALF_MEM=512Mi

4) Update the nosql Deployment (DO NOT delete it)

First, get the container name (Deployment may have a custom container name):

kubectl -n haddock get deploy nosql -o jsonpath='{.spec.template.spec.containers[*].name}{"\n"}'

Now set resources (this updates the Deployment in-place):

kubectl -n haddock set resources deploy nosql \

--requests=memory=128Mi \

--limits=memory=$HALF_MEM

5) Ensure the update rolls out successfully

kubectl -n haddock rollout status deploy nosql

6) Verify the pod has the right requests/limits

kubectl -n haddock get deploy nosql -o jsonpath='{.spec.template.spec.containers[0].resources}{"\n"}'

kubectl -n haddock get pods

Pick the new pod and confirm:

kubectl -n haddock describe pod | sed -n '/Requests:/,/Limits:/p'

You should see:

Requests: memory 128Mi

Limits: memory

If rollout fails (common cause)

If you accidentally set a limit above the namespace max, pods won’t start. Check events:

kubectl -n haddock describe deploy nosql

kubectl -n haddock get events --sort-by=.lastTimestamp | tail -n 20

Solution: