pod-environment-var.yaml

# https://kubernetes.io/docs/tasks/inject-data-application/define-command-argument-container/
# https://kubernetes.io/docs/tasks/inject-data-application/define-environment-variable-container/
# https://cheatsheet.dennyzhang.com/kubernetes-yaml-templates
apiVersion: v1
kind: Pod
metadata:
  name: command-demo
  labels:
    purpose: demonstrate-command
spec:
  containers:
  - name: command-demo-container
    image: debian
    command: ["printenv"]
    args: ["HOSTNAME", "KUBERNETES_PORT", "DEMO_GREETING", "DEMO_FAREWELL"]
    env:
      - name: DEMO_GREETING
        value: "Hello from the environment"
      - name: DEMO_FAREWELL
        value: "Such a sweet sorrow"
  restartPolicy: OnFailure