mysql-deployment-configmap.yml

# Config Map Details Should not be checked in SCM tools. Instead create configMaps using commands or ymls directly in respective clusters.
---
kind: ConfigMap 
apiVersion: v1 
metadata:
  name: mysql-configmap 
data:
  # Configuration values can be set as key-value properties
  password: devdb@123
  
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: wordpress-mysql
  labels:
    app: wordpress
spec:
  selector:
    matchLabels:
      app: wordpress
      tier: mysql
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: wordpress
        tier: mysql
    spec:
      containers:
        - image: mysql:5.7
          imagePullPolicy: Always
          name: mysql
          env:
          - name: MYSQL_ROOT_PASSWORD
            valueFrom:
               configMapKeyRef:
                  name: mysql-configmap
                  key: password
          ports:
            - containerPort: 3306
              name: mysql
          volumeMounts:
            - name: mysql-persistent-storage
              mountPath: /var/lib/mysql
      volumes:
      - name: mysql-persistent-storage
        hostPath:
          path: /tmp/mysqlbackup
---
apiVersion: v1
kind: Service
metadata:
  name: wordpress-mysql
  labels:
    app: wordpress
spec:
  ports:
    - port: 3306
  selector:
    app: wordpress
    tier: mysql