Discuss Linux Foundation CKA Exam Topic 5 Question 27

Score:7%

Context

An existing Pod needs to be integrated into the Kubernetes built-in logging architecture (e. g. kubectl logs). Adding a streaming sidecar container is a good and common way to accomplish this requirement.

Task

Add a sidecar container named sidecar, using the busybox Image, to the existing Pod big-corp-app. The new sidecar container has to run the following command:

/bin/sh -c tail -n+1 -f /va r/log/big-corp-app.log

Use a Volume, mounted at /var/log, to make the log file big-corp-app.log available to the sidecar container.

AExplanation:
Solution:
#
kubectl get pod big-corp-app -o yaml
#
apiVersion: v1
kind: Pod
metadata:
name: big-corp-app
spec:
containers:
- name: big-corp-app
image: busybox
args:
- /bin/sh
- -c
- >
i=0;
while true;
do
echo '$(date) INFO $i' >> /var/log/big-corp-app.log;
i=$((i+1));
sleep 1;
done
volumeMounts:
- name: logs
mountPath: /var/log
- name: count-log-1
image: busybox
args: [/bin/sh, -c, 'tail -n+1 -f /var/log/big-corp-app.log']
volumeMounts:
- name: logs
mountPath: /var/log
volumes:
- name: logs
emptyDir: {
}
#
kubectl logs big-corp-app -c count-log-1

Suggested Answer: A

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13 comments · newest first

Mable 12 months ago

I’ve done this before, works like a charm!

Simona 1 year ago

Nice, but what if the log file gets too big?

Yong 1 year ago

Wait, can you really just use busybox for this? Seems too simple.

Steffanie 1 year ago

Totally agree, sidecars are super useful for logging.

Nancey 1 year ago

Sounds like a solid plan with the sidecar!

Barney 1 year ago

I feel like the command for the sidecar is right, but I’m a bit confused about how to structure the YAML correctly.

Ezekiel 1 year ago

This seems similar to the practice question we did on adding sidecars, but I can't recall if we used `emptyDir` for the volume type.

Benton 1 year ago

I think I remember that we need to add the sidecar container to the existing Pod, but I'm not sure about the exact syntax for the volume mounts.

Pearly 1 year ago

I know we need to use `kubectl get pod` to fetch the existing Pod's configuration first, but I’m not clear on how to modify it afterward.

Veronique 1 year ago

Hmm, this looks like a tricky one. I'll need to carefully read through the options and think about the map algebra syntax.

Gerardo 1 year ago

Hmm, let me think about this. I know code quality metrics are important, but I'm not sure which of these options fit that category. I'll have to carefully consider each one.

Fannie 1 year ago

I'm a little confused by the wording of the options. I'll need to re-read them a few times to make sure I understand the distinctions.

Mattie 1 year ago

Hmm, I'm a bit unsure about the differences between these address types. I'll need to review my notes on domain names and URLs to make sure I understand the distinctions.

Linux Foundation CKA Exam - Topic 5 Question 27 Discussion