pod的环境变量使用，存活探针，就绪探针，资源限制和资源需求

kubectl create deployment mysql --image mysql:8.0 --dry-run=client -o yaml > mysql1.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    app: mysql
  name: mysql
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mysql
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: mysql
    spec:
      containers:
      - image: mysql:8.0
        name: mysql
        env:
        - name: MYSQL_RANDOM_ROOT_PASSWORD
          value: '1'
        - name: MYSQL_DATABASE
          value: 'wordpress'
        - name: MYSQL_USER
          value: 'wpuser'          
        resources: {}
status: {}

root@k8s-master01:~/wordpress#kubectl apply -f mysql1.yaml

#mysql
apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    app: mysql
  name: mysql
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mysql
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: mysql
    spec:
      containers:
      - image: mysql:8.0
        name: mysql
        readinessProbe:
          exec:
            command: ['/bin/sh', '-c', '/usr/bin/mysql -u wpuser -p123456']
          initialDelaySeconds: 10
          timeoutSeconds: 5
          periodSeconds: 5
          failureThreshold: 10
        livenessProbe:
          tcpSocket:
            port: 3306
          initialDelaySeconds: 10
          timeoutSeconds: 5
          periodSeconds: 5
          failureThreshold: 5
        env:
        - name: MYSQL_RANDOM_ROOT_PASSWORD
          value: '1'
        - name: MYSQL_DATABASE
          value: 'wordpress'
        - name: MYSQL_USER
          value: 'wpuser'                              
        resources:
          requests:
            memory: "64Mi"
            cpu: "200m"
          limits:
            memory: "512Mi"
            cpu: "1"
status: {}


#wordpress
apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    app: wordpress
  name: wordpress
spec:
  replicas: 1
  selector:
    matchLabels:
      app: wordpress
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: wordpress
    spec:
      containers:
      - image: wordpress:5.7
        name: wordpress
        livenessProbe:
          httpGet:
            path: '/'
            port: 80
            scheme: HTTP
          intialDelaySeconds: 3
          timeoutSeconds: 2           
        readnessProbe:
          httpGet:
            path: '/'
            port: 80
            scheme: HTTP
          intialDelaySeconds: 15
          timeoutSeconds: 2
        restartPolicy: Always              
        env:
        - name: WORDPRESS_DB_HOST
          value: '10.244.3.56'
        - name: WORDPRESS_DB_NAME
          value: 'wordpress'
        - name: WORDPRESS_DB_USER
          value: 'wpuser'
        - name: WORDPRESS_DB_PASSWORD
          value: '123456'
        ports:
        - containerPort: 80
          hostPort: 8080

        resources:
          requests:
            memory: "90Mi"
            cpu: "1"
          limits:
            memory: "300Mi"
            cpu: "1
status: {}