创建confingmap：
[root@master configmap]#

#cat www.conf 
	server {
  	server_name myapp.zhixin.com;
  	listen 80;
  	root /data/web/html;
}

[root@master configmap]#

 kubectl create configmap nginx-www --from-file=www.conf	

挂载到pod：

apiVersion: v1
kind: Pod
metadata:
  name: pod-cm-2
  namespace: default
  labels:
    app: myapp
    tier: frontend
spec:
  containers:
  - name: myapp
    image: nginx
    imagePullPolicy: IfNotPresent
    volumeMounts:
    - name: nginxconf
      mountPath: /etc/nginx/conf.d/
      readOnly: true
    ports:
    - name: http
      containerPort: 80
  volumes:
  - name: nginxconf
    configMap:
      name: nginx-config