I don't know what i did wrong on Mock 5 test of Ultimate Certified Kubernetes Administrator (CKA) Mock Exam Series

Kubernetes
#1

Task
SECTION: SCHEDULING

For this question, please set the context to cluster3 by running:

kubectl config use-context cluster3

On cluster3, there is a web application pod running inside the default namespace. This pod which is part of a deployment called webapp-color-wl10 and makes use of an environment variable that can change constantly. Add this environment variable to a configmap and configure the pod in the deployment to make use of this config map.

Use the following specs-

  1. Create a new configMap called webapp-wl10-config-map with the key and value as - APP_COLOR=red.

  2. Update the deployment to make use of the newly created configMap name.

  3. Delete and recreate the deployment if necessary.

My solution was:

kubectl config use-context cluster3
kubectl create configmap webapp-wl10-config-map --from-literal=APP_COLOR=red

kubectl edit deployment webapp-color-wl10

apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: webapp-color-wl10
name: webapp-color-wl10
namespace: default
resourceVersion: “1846”
spec:
replicas: 2
selector:
matchLabels:
app: webapp-color-wl10
template:
metadata:
creationTimestamp: null
labels:
app: webapp-color-wl10
spec:
containers:
- env:
- name: APP_COLOR
valueFrom:
configMapKeyRef:
key: APP_COLOR
name: webapp-wl10-config-map
image: kodekloud/webapp-color
name: webapp-color-wl10

k exec webapp-color-wl10-7649cdd948-px9xz – env
PATH=/usr/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
HOSTNAME=webapp-color-wl10-7649cdd948-px9xz
LANG=C.UTF-8
GPG_KEY=0D96DF4D4110E5C43FBFB17F2D347EA6AA65421D
PYTHON_VERSION=3.6.6
PYTHON_PIP_VERSION=18.1
APP_COLOR=red
WEBAPP_COLOR_WL10_SERVICE_PORT_8080_TCP=tcp://10.43.81.189:8080
KUBERNETES_SERVICE_PORT_HTTPS=443
KUBERNETES_PORT_443_TCP_PORT=443
WEBAPP_COLOR_WL10_SERVICE_SERVICE_PORT=8080
WEBAPP_COLOR_WL10_SERVICE_PORT_8080_TCP_PORT=8080
KUBERNETES_SERVICE_PORT=443
KUBERNETES_PORT=tcp://10.43.0.1:443
KUBERNETES_PORT_443_TCP_ADDR=10.43.0.1
WEBAPP_COLOR_WL10_SERVICE_SERVICE_HOST=10.43.81.189
KUBERNETES_SERVICE_HOST=10.43.0.1
KUBERNETES_PORT_443_TCP=tcp://10.43.0.1:443
KUBERNETES_PORT_443_TCP_PROTO=tcp
WEBAPP_COLOR_WL10_SERVICE_PORT=tcp://10.43.81.189:8080
WEBAPP_COLOR_WL10_SERVICE_PORT_8080_TCP_PROTO=tcp
WEBAPP_COLOR_WL10_SERVICE_PORT_8080_TCP_ADDR=10.43.81.189
HOME=/root

as you can see APP_COLOR is been set by the configmap as required by the task

The labs checker said my solution was wrong and i don’t understand why.
The oficial solucion is

Solution
Set the correct context: -

kubectl config use-context cluster3

Inspect the given pod in the default namespace: -

kubectl get pods -n default

Let’s create a new configMap in the default namespace as follows:-

kubectl create configmap webapp-wl10-config-map --from-literal=APP_COLOR=red

And now configure the newly created configmap to the web application pod’s template: -

apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: webapp-color-wl10
name: webapp-color-wl10
namespace: default
spec:
replicas: 2
selector:
matchLabels:
app: webapp-color-wl10
template:
metadata:
labels:
app: webapp-color-wl10
spec:
containers:
- image: kodekloud/webapp-color
name: webapp-color-wl10
envFrom:
- configMapRef:
name: webapp-wl10-config-map

The only diference i could see was the method on defining the variable that was diferent

#2

I’m not sure which Mock Exam you’re doing here – I believe there are six of them – or which question number; if you want me to check the problem, I’ll need to know that. But just on the basis of what I do know, it appears that that the grader wants you to use envFrom rather than valueFrom to interact with the configMap. That would be my guess, at any rate.

#3

but where in the text does he ask for this?

#4

i wrote the whole assignment

#5

The lab might not say this explicitly. Sometimes this is simply an implementation choice.