kubernetes-handbook/manifests/test/configmap-test.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: my-nginx
spec:
  replicas: 1
  template:
    metadata:
      labels:
        run: my-nginx
    spec:
      containers:
      - name: my-nginx
        image: harbor-001.jimmysong.io/library/nginx:1.9
        ports:
        - containerPort: 80
        volumeMounts:
        - name: config-volume
          mountPath: /tmp
      volumes:
        - name: config-volume
          configMap:
            name: special-config
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: special-config
  namespace: default
data:
  log_level: WARN