【bug】missing required field “selector“ in io.k8s.api.apps.v1.DeploymentSpec；

创建Pod时报错如下：
执行创建nginx的pod命令报错如下：

kubectl apply -f nginx2.yml

error: error validating "nginx2.yml": error validating data: ValidationError(Deployment.spec): missing required field "selector" in io.k8s.api.apps.v1.DeploymentSpec; if you choose to ignore these errors, turn validation off with --validate=false

原nginx2.yml文件：

---
apiVersion: v1
kind: Pod
metadata:
  name: naginx-deployment
spec:
  replicas: 2
  template:
    metadata:
      labels:
        app: nginx
        track: stable
    spec:
      selector:
        matchLabels:
          app: chen
      containers:
        - name: nginx
          images: nginx
          ports:
            - containerPort: 80

报错内容：表示当前未添加必选参数selector，在nginx.yml文件中添加selector参数即可：

apiVersion: apps/v1     #Api接口版本
kind: Deployment        #定义控制器
metadata:
 name: nginx-deployment #deployment名称
spec:
 replicas: 3            #在具体参数信息spec下，只指定了副本数量，还需要指定副本标签与 Deployment控制器进行匹配
 selector:
   matchLabels:
     app: nginx-deployment
 template:
   metadata:
     labels:
       app: nginx-deployment
   spec:
     containers:
       - name: nginx-deployment
         image: nginx:1.7.9
         ports:
           - containerPort: 80
~                             

再次执行kubectl apply -f nginx2.yml，可以发现命令执行成功，pod也成功创建了