Linux Foundation CKAD Exam - Topic 6 Question 32 Discussion

Actual exam question for Linux Foundation's CKAD exam

Question #: 32
Topic #: 6

[All CKAD Questions]

Refer to Exhibit.

Set Configuration Context:

[student@node-1] $ | kubectl

Config use-context k8s

Context

A container within the poller pod is hard-coded to connect the nginxsvc service on port 90 . As this port changes to 5050 an additional container needs to be added to the poller pod which adapts the container to connect to this new port. This should be realized as an ambassador container within the pod.

Task

* Update the nginxsvc service to serve on port 5050.

* Add an HAproxy container named haproxy bound to port 90 to the poller pod and deploy the enhanced pod. Use the image haproxy and inject the configuration located at /opt/KDMC00101/haproxy.cfg, with a ConfigMap named haproxy-config, mounted into the container so that haproxy.cfg is available at /usr/local/etc/haproxy/haproxy.cfg. Ensure that you update the args of the poller container to connect to localhost instead of nginxsvc so that the connection is correctly proxied to the new service endpoint. You must not modify the port of the endpoint in poller's args . The spec file used to create the initial poller pod is available in /opt/KDMC00101/poller.yaml

AExplanation:
Solution:
To update the nginxsvc service to serve on port 5050, you will need to edit the service's definition yaml file. You can use the kubectl edit command to edit the service in place.
kubectl edit svc nginxsvc
This will open the service definition yaml file in your default editor. Change the targetPort of the service to 5050 and save the file.
To add an HAproxy container named haproxy bound to port 90 to the poller pod, you will need to edit the pod's definition yaml file located at /opt/KDMC00101/poller.yaml.
You can add a new container to the pod's definition yaml file, with the following configuration:
containers:
- name: haproxy
image: haproxy
ports:
- containerPort: 90
volumeMounts:
- name: haproxy-config
mountPath: /usr/local/etc/haproxy/haproxy.cfg
subPath: haproxy.cfg
args: ['haproxy', '-f', '/usr/local/etc/haproxy/haproxy.cfg']
This will add the HAproxy container to the pod and configure it to listen on port 90. It will also mount the ConfigMap haproxy-config to the container, so that haproxy.cfg is available at /usr/local/etc/haproxy/haproxy.cfg.
To inject the configuration located at /opt/KDMC00101/haproxy.cfg to the container, you will need to create a ConfigMap using the following command:
kubectl create configmap haproxy-config --from-file=/opt/KDMC00101/haproxy.cfg
You will also need to update the args of the poller container so that it connects to localhost instead of nginxsvc. You can do this by editing the pod's definition yaml file and changing the args field to args: ['poller','--host=localhost'].
Once you have made these changes, you can deploy the updated pod to the cluster by running the following command:
kubectl apply -f /opt/KDMC00101/poller.yaml
This will deploy the enhanced pod with the HAproxy container to the cluster. The HAproxy container will listen on port 90 and proxy connections to the nginxsvc service on port 5050. The poller container will connect to localhost instead of nginxsvc, so that the connection is correctly proxied to the new service endpoint.
Please note that, this is a basic example and you may need to tweak the haproxy.cfg file and the args based on your use case.

Show Suggested Answer

Suggested Answer: A

by Fannie at Jan 27, 2024, 05:36 AM

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Alishia

4 months ago

I'm surprised they didn't mention updating the poller args earlier.

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Gabriele

4 months ago

HAproxy is a solid choice for this setup!

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Man

4 months ago

Wait, why do we need an ambassador container? Seems unnecessary.

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Tayna

4 months ago

Totally agree, that's the way to go!

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Elmer

5 months ago

Just edit the service with `kubectl edit svc nginxsvc` to change the port.

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Gussie

5 months ago

I definitely remember needing to change the args for the poller container, but I can't recall if we used localhost or something else in our practice.

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Amber

5 months ago

I feel a bit confused about the ConfigMap part. Did we cover how to mount it properly in the container?

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Paulene

5 months ago

I think we did a similar question where we had to add a container to a pod. I hope I can recall the correct syntax for the YAML file.

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Weldon

5 months ago

I remember we practiced updating service ports, but I'm not entirely sure how to edit the service definition directly.

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Tracie

5 months ago

No problem, I've done stuff like this before. I'll update the service, create the ConfigMap, and add the HAproxy container. Updating the poller args should be straightforward.

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Nu

5 months ago

Whoa, this is a lot of moving parts. I better make sure I don't miss any details. Updating the service, creating the ConfigMap, and modifying both containers - I'll need to stay organized.

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Howard

5 months ago

Okay, let's see. I think I understand the main tasks - update the service, add the HAproxy container, and modify the poller container. I'll need to reference the YAML files and ConfigMap closely.

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Rolland

6 months ago

Hmm, this looks like a tricky one. I'll need to carefully read through the requirements and plan out my steps before diving in.

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Loren

6 months ago

I'm a bit confused by the wording of this question. Is it asking about the properties or characteristics of a flow port that's linked to a flow specification? I'll have to re-read it a few times.

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Ashlee

6 months ago

Hmm, I'm a bit confused about the relationship between Bharat Medicals and Maurya Logistics. Do they have equal responsibilities when it comes to consumer data protection?

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Arminda

6 months ago

Hmm, I'm not sure about the different roles and responsibilities here. Let me think this through carefully.

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Sheridan

6 months ago

Hmm, I'm a bit confused on how to approach this. I know it's about probabilities, but I'm not sure how to calculate the probability of no defects given the individual probabilities of the two defect types.

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Leanora

11 months ago

Ah, the joys of working with Kubernetes. At least it's not a 'write a new YAML from scratch' question. That would be a real head-scratcher!

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Alberta

10 months ago

Tran: True, the satisfaction of solving a Kubernetes puzzle is unmatched.

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Tran

10 months ago

User 2: Definitely, but it's always a good feeling when you figure it out.

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Arlene

10 months ago

User 1: I know right, working with Kubernetes can be challenging sometimes.

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Earleen

11 months ago

Alright, time to put my Kubernetes ninja skills to the test! I bet the exam writers are chuckling at us trying to figure this out.

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Celestina

10 months ago

Agreed, let's tackle this task step by step and show those exam writers what we're made of!

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Rosendo

10 months ago

Definitely! Let's follow the steps provided and we'll have that pod updated in no time.

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Keva

10 months ago

I know right, Kubernetes can be tricky sometimes. But we got this!

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Ozell

11 months ago

Wait, so we have to edit the pod and service YAML files directly? No kubectl commands to do this? That's a bit old-school, but I guess it gets the job done.

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Breana

10 months ago

It may seem old-school, but it's a reliable way to make the necessary changes.

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Marjory

10 months ago

Yes, you need to edit the pod and service YAML files directly for this task.

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Justine

10 months ago

It may seem old-school, but it's a reliable way to make the necessary changes.

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Sherell

10 months ago

Yes, you need to edit the pod and service YAML files directly for this task.

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Elroy

11 months ago

The solution provided explains how to update the service and add the HAproxy container with the necessary configuration. We should follow those steps.

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Catalina

11 months ago

Yes, we need to add an HAproxy container named haproxy bound to port 90 to the poller pod.

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Kyoko

11 months ago

Hmm, the ConfigMap injection seems a bit tricky. Hope I don't mess up the haproxy.cfg file. Fingers crossed it all works as expected!

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Elroy

11 months ago

I think the task is asking us to update the nginxsvc service to serve on port 5050.

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Joanna

11 months ago

Okay, this looks straightforward. Update the service port, add the HAproxy container, and update the poller container's args. Gotta love these 'modify existing resources' tasks!

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