Kubernetes CKA sample exam question 95 with answer

Question
There is a Deployment in Namespace application1 which seems to have issues and is not getting ready.
Fix it by only editing the Deployment itself and no other resources.

Answer
Get details about deploy:

kubectl -n application1 get deploy

can be observed deploy api with the READY field as 0/3 which means that out of 3 pods - 0 are ready.
Get more info:

kubectl -n application1 describe deploy api

this won't help us much - nothing is there in terms of warnings or errors
Try other way:

kubectl -n application1 logs deployments/api

We are getting:

Error from server (BadRequest): container "httpd" in pod "api-75bdbf4d57-cj6b7" is waiting to start: CreateContainerConfigError

Get the pods:

kubectl -n application1 get po

And try to get events from a pod:

kubectl -n application1 describe po api-75bdbf4d57-wsgsc

There is one of message that can catch attention:

Error: configmap "category" not found

Check above - the configmap category is used in this line:

Environment:
  CATEGORY:  <set to the key 'category' of config map 'category'>  Optional: false

Check the configmaps:

kubectl -n application1 get cm

It is not category - it is configmap-category by name:

configmap-category   1      3m41s

So, we need edit the deployment:

kubectl -n application1 edit deploy api

and to change the name of configmap in it:

spec:
  template:
    spec:
      containers:
      - env:
        - name: CATEGORY
          valueFrom:
            configMapKeyRef:
              key: category
              name: configmap-category

Save and exit,
After some time, the deployment will be functional