[Kubernetes - 2단계: ConfigMap & Secret]

apiVersion: v1
kind: ConfigMap
metadata:
  name: app-config
data:
  APP_MODE: "production"
  APP_PORT: "8080"

apiVersion: v1
kind: Secret
metadata:
  name: app-secret
type: Opaque
data:
  DB_PASSWORD: c3VwZXJzZWNyZXQ=   # base64 → "supersecret"

apiVersion: v1
kind: Pod
metadata:
  name: env-demo
spec:
  containers:
  - name: demo-container
    image: busybox
    command: [ "sh", "-c", "env; sleep 3600" ]
    env:
    - name: APP_MODE
      valueFrom:
        configMapKeyRef:
          name: app-config
          key: APP_MODE
    - name: APP_PORT
      valueFrom:
        configMapKeyRef:
          name: app-config
          key: APP_PORT
    - name: DB_PASSWORD
      valueFrom:
        secretKeyRef:
          name: app-secret
          key: DB_PASSWORD

kubectl apply -f configmap.yaml
kubectl apply -f secret.yaml
kubectl apply -f pod-env.yaml

kubectl get pods
kubectl describe pod env-demo
kubectl exec -it env-demo -- sh

# 컨테이너 내부에서 확인
env

# 출력 예시 (중간 생략)
APP_MODE=production
APP_PORT=8080
DB_PASSWORD=supersecret