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Linux-Foundation CKAD Sample Questions
Question # 1
Context
You are asked to deploy an application developed for an older version of Kubernetes on a
cluster running a recent version of Kubernetes .
You must connect to the correct host . Failure to do so may result in a zero score.
[candidate@base] $ ssh ckad00026 Task
Fix any API -deprecation issues in the manitest file
/home/candidate/credible-mite/web.yaml
so that the application can be deployed on cluster ckad00026.
The application was developed for Kubernetes v1.15.
The cluster ckad00026 runs Kubernetes 1.29+.
Deploy the application specified in the updated manifest file
/home/candidate/credible-mite/web.yaml in namespace garfish .
Answer: See the Explanation below for complete solution.
Explanation:
ssh ckad00026
Your job is to edit /home/candidate/credible-mite/web.yaml so it uses APIs supported on
Kubernetes 1.29+, then deploy it into namespace garfish.
Because I can’t see your file from here, the most reliable exam approach is:
run a server-side dry-run to reveal the exact deprecated/removed APIs and
schema errors
edit the manifest to the modern API versions/fields
re-run dry-run until it passes
apply for real and verify rollout
1) Go to the manifest and run a server-side dry-run
cd /home/candidate/credible-mite
ls -l
sed -n '1,200p' web.yaml
Make sure the namespace exists:
kubectl get ns garfish || kubectl create ns garfish
Now run a server-side dry-run (this catches removed APIs on the cluster):
kubectl -n garfish get ingress 2>/dev/null || true
If there is a Deployment, verify rollout:
kubectl -n garfish get deploy
kubectl -n garfish rollout status deploy --all
Check pods/events if something fails:
kubectl -n garfish get pods -o wide
kubectl -n garfish describe pod <pod-name>
kubectl -n garfish get events --sort-by=.lastTimestamp | tail -n 30
Question # 2
You must connect to the correct host . Failure to do so may result in a zero score.
[candidate@base] $ ssh ckad00029
Task
Modify the existing Deployment named store-deployment, running in namespace
grubworm, so that its containers
run with user ID 10000 and
have the NET_BIND_SERVICE capability added
The store-deployment 's manifest file Click to copy
/home/candidate/daring-moccasin/store-deplovment.vaml
Answer: See the Explanation below for complete solution.
Explanation:
ssh ckad00029
You must modify the existing Deployment store-deployment in namespace grubworm so
that its containers:
run as user ID 10000
have Linux capability NET_BIND_SERVICE added
And you’re told to use the manifest file at:
/home/candidate/daring-moccasin/store-deplovment.vaml (note: the filename looks
misspelled; follow it exactly on the host)
1) Inspect the current Deployment and locate the manifest file
kubectl -n grubworm get deploy store-deployment
ls -l /home/candidate/daring-moccasin/
Open the manifest:
sed -n '1,200p' "/home/candidate/daring-moccasin/store-deplovment.vaml"
2) Edit the manifest to add SecurityContext
Edit the file:
vi "/home/candidate/daring-moccasin/store-deplovment.vaml"
2.1 Set Pod-level runAsUser = 10000
Under:
spec.template.spec add:
securityContext:
runAsUser: 10000
2.2 Add NET_BIND_SERVICE capability at container-level
Under the container spec (for each container in containers:), add:
securityContext:
capabilities:
add: ["NET_BIND_SERVICE"]
A complete example of what it should look like (mind indentation):
apiVersion: apps/v1
kind: Deployment
metadata:
name: store-deployment
namespace: grubworm
spec:
template:
spec:
securityContext:
runAsUser: 10000
containers:
- name: store
image: someimage
securityContext:
capabilities:
add: ["NET_BIND_SERVICE"]
Important notes:
runAsUser can be set at Pod level (applies to all containers) or per-container. Podlevel is cleanest if all containers should run as 10000.
Capabilities must be set per-container (that’s where Kubernetes supports it).
kubectl -n grubworm describe pod <pod-name> | sed -n '/Security Context:/,/Containers:/p'
kubectl -n grubworm describe pod <pod-name> | sed -n '/Containers:/,/Conditions:/p'
If there are multiple containers
Repeat the container-level securityContext.capabilities.add block for each container under
spec.template.spec.containers.
Question # 3
Context
An existing web application must be exposed externally.
You must connect to the correct host . Failure to do so may result in a zero score.
[candidate@base] $ ssh ckad00025
An application externally using the URL external.sterling-bengal.local . Any requests
starting with / must be routed to the application web-app.
To test the web application's external reachability, run
[candidate@ckad00025] $ curl http://external.sterling-bengal.local/ or open this URL in the remote desktop's browser.
Answer: See the Explanation below for complete solution.
Explanation:
ssh ckad00025
You need to expose the existing app “web-app” externally at:
Host: external.sterling-bengal.local
Path: / (and anything starting with /) route to web-app
In CKAD labs, this is almost always done with an Ingress pointing to the Service web-app.
1) Find where web-app Service lives (namespace + port)
kubectl get svc -A | grep -w web-app
You’ll get something like:
<NAMESPACE> web-app ClusterIP ... <PORT>/TCP
Set the namespace:
NS=<NAMESPACE>
Check the service port(s):
kubectl -n $NS get svc web-app -o yaml
Note the service port number (commonly 80).
Also verify it has endpoints (so it actually routes to pods):
kubectl -n $NS get endpoints web-app -o wide
If endpoints are empty, the Service selector doesn’t match pods — tell me and I’ll give the
exact fix. But usually it’s fine.
2) Create the Ingress to route / to web-app
Create a manifest (use the service port you saw; I’ll assume 80 below):
cat <<'EOF' > web-app-ingress.yaml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: web-app-ingress
spec:
rules:
- host: external.sterling-bengal.local
http:
paths:
- path: /
pathType: Prefix
backend:
service:
name: web-app
port:
number: 80
EOF
Apply it:
kubectl -n $NS apply -f web-app-ingress.yaml
Verify:
kubectl -n $NS get ingress web-app-ingress
kubectl -n $NS describe ingress web-app-ingress
If your Service port is not 80, change number: 80 to the correct value and re-apply.
kubectl -n $NS get ingress web-app-ingress -o wide
C) Do we have endpoints?
kubectl -n $NS get endpoints web-app -o wide
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