我是 Kubernetes 的新手，并尝试使用 Kubernetes pod 容器部署 WordPress 和 MySQL，但它在运行 Kubernetes 时抛出错误“建立数据库连接时出错”

以下是我的pod和服务定义文件

秘密.yaml

apiVersion: v1
kind: Secret
metadata:
  name: mysql-pass
type: Opaque
data:
  username: XXXXX
  password: XXXXX

mysql-pod-defination-file.yaml

apiVersion: v1
kind: Pod
metadata:
 name: mysql-app
 labels:
  name: mysql-app-label
spec:
 containers:
  - image: mysql:5.6
    env:
     - name: MYSQL_ROOT_PASSWORD
       valueFrom:
        secretKeyRef:
         name: mysql-pass
         key: password
    name: mysql-image
    ports:
     - containerPort: 3306

豆荚定义文件

apiVersion: v1
kind: Pod
metadata:
 name: wordpress-app
 labels:
  name: wordpress-app-label
spec:
 containers:
  - image: wordpress:apache
    name: wordpress-image
    env:
        - name: WORDPRESS_DB_HOST
          value: db
        - name: WORDPRESS_DB_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysql-pass
              key: password
    ports:
        - containerPort: 80 

mysql-服务定义-file.yaml

apiVersion: v1
kind: Service
metadata:
 name: db
 labels:
  name: db-service
  app: demo-wordpress-app
spec: 
 ports: 
  - port: 3306
 selector:
    name: mysql-app-label

服务定义文件yaml

apiVersion: v1
kind: Service
metadata:
 name: wordpress-service
 labels:
  name: wordpress-service
  app: demo-wordpress-app
spec:
 type: NodePort 
 ports: 
  - port: 80
    targetPort: 80
 selector:
    name: wordpress-app-label

我能够从minikube Pod容器内成功连接到mysql数据库

我的定义文件有什么问题吗？