Good example definition file using environment variables:

---
apiVersion: v1
kind: Pod
metadata:
  labels:
    name: webapp-color
  name: webapp-color
  namespace: default
spec:
  containers:
  - env:
    - name: APP_COLOR
      value: green
    image: kodekloud/webapp-color
    name: webapp-color
  • Environment Variables are where it says env –> name
  • Good example of a ConfigMap: 
    kubectl create configmap  webapp-config-map --from-literal=APP_COLOR=darkblue --from-literal=APP_OTHER=disregard
  • A pod definition file using a configmap: ``` — apiVersion: v1 kind: Pod metadata: labels: name: webapp-color name: webapp-color namespace: default spec: containers:
    • env:
      • name: APP_COLOR valueFrom: configMapKeyRef: name: webapp-config-map key: APP_COLOR image: kodekloud/webapp-color name: webapp-color ```
  • Use kubectl edit pod <pod-name> to at least generate a new definition file easily (you won’t be able to deply it
    • Then you can forcefully delete a pod with kubectl replace --force -f /tmp/<pod_definition_file.yaml>
  • Short form of ConfigMap is cm.
  • Good help command kubectl create cm --help - useful in the exam.
  • Another good one is kubectl create configmap webapp-config-map --from-literal=APP_COLOR=darkblue
  • Edit a pod with kubectl edit pod <pod name>

Updated: