CKA 예제 리마인더 - 15. Env Variables

파드의 Env를 변경하세요

kubectl get po webapp-color -o yaml > ./webapp-color.yaml

로 yaml 파일을 내려받고 Env 수정 후 kubectl replace --force -f webapp-color.yaml

apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: "2024-10-31T16:25:14Z"
  labels:
    name: webapp-color
  name: webapp-color
  namespace: default
  resourceVersion: "827"
  uid: 50395f87-2ce8-4f41-9f1c-6a4179059fbd
spec:
  containers:
  - env:
    - name: APP_COLOR
      value: pink
    image: kodekloud/webapp-color
    imagePullPolicy: Always
    name: webapp-color

spec.containers.env 수정



or


kubectl set env RESOURCE/NAME KEY_1=VAL_1 ... KEY_N=VAL_N [options]

명령어를 사용해서

kubectl set env po/webapp-color APP_COLOR=green

Solution )

kubectl edit po <pod> 명령어로 수정 후 저장된 tmp 파일을 사용해서 replace




현재 네임스페이스에 존재하는 configmap 갯수를 찾으세요

kubectl get configmap

특정 configmap을 inspect 하세요

kubectl describe configmap <configmap>



새로운 컨피그맵을 만드세요

ConfigMap Name: webapp-config-map

Data: APP_COLOR=darkblue

Data: APP_OTHER=disregard

kubectl create configmap webapp-config-map \
> --from-literal=APP_COLOR=darkblue \
> --from-literal=APP_OTHER=disregard \
> --dry-run=client -o yaml > ./webapp-config-map.yaml

생성된 yaml

apiVersion: v1
data:
  APP_COLOR: darkblue
  APP_OTHER: disregard
kind: ConfigMap
metadata:
  creationTimestamp: null
  name: webapp-config-map

kubectl apply -f webapp-config-map.yaml



파드에 새로 생성한 컨피그맵을 적용하세요

Pod Name: webapp-color

ConfigMap Name: webapp-config-map

yaml 파일 수정 후 replace

apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: "2024-10-31T16:25:14Z"
  labels:
    name: webapp-color
  name: webapp-color
  namespace: default
  resourceVersion: "827"
  uid: 50395f87-2ce8-4f41-9f1c-6a4179059fbd
spec:
  containers:
  #- env:
  #  - name: APP_COLOR
  #    value: green
  - env:
    - name: webapp-config-map
      valueFrom:
        configMapKeyRef:
          name: webapp-config-map
          key: APP_COLOR
    image: kodekloud/webapp-color
    imagePullPolicy: Always
    name: webapp-color

Solution )

apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: "2024-10-31T16:25:14Z"
  labels:
    name: webapp-color
  name: webapp-color
  namespace: default
  resourceVersion: "827"
  uid: 50395f87-2ce8-4f41-9f1c-6a4179059fbd
spec:
  containers:
  - envFrom:
        configMapRef:
          name: webapp-config-map
    image: kodekloud/webapp-color
    imagePullPolicy: Always
    name: webapp-color