nginx-proxy.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nginx-proxy
  labels:
    proxy: nginx
spec:
  template:
    metadata:
      labels:
        proxy: nginx
    spec:
      terminationGracePeriodSeconds: 5

      containers:
      - name: nginx-proxy
        image: nginx:alpine
        ports:
        - name: http
          containerPort: 80
        volumeMounts:
        - name: config-volume
          mountPath: /etc/nginx/nginx.conf
          subPath: nginx.conf

      volumes:
      - name: config-volume
        configMap:
          name: nginx-main-config
          # map file in directory here
          items:
            - key: nginx.conf
              path: nginx.conf