В кластере kubernetes Spring загрузочное приложение не может подключиться mysql к более чем одному контейнеру.
Пример. У меня Mysql Container Running и у меня есть приложение для весенней загрузки, которое подключается к mysql контейнеру, все работает нормально, если у меня есть одно приложение для весенней загрузки
Но если я масштабирую загрузочный компонент Spring до 4-х модулей, то один из них не сможет подключиться к mysql контейнеру
Пожалуйста, помогите в этом
Журналы
Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_111]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_111]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_111]
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_111]
at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:167) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:91) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
at com.mysql.cj.NativeSession.connect(NativeSession.java:144) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
at com.mysql.cj.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:850) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
... 58 common frames omitted
Caused by: java.net.UnknownHostException: some-mysql
Kubernetes Mysql Файл развертывания
apiVersion: v1
kind: PersistentVolume
metadata:
name: mysql-pv
labels:
type: local
spec:
storageClassName: standard
capacity:
storage: 250Mi
accessModes:
- ReadWriteOnce
hostPath:
path: "/mnt/data"
persistentVolumeReclaimPolicy: Retain
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: mysql-pv-claim
labels:
app: practice-app
spec:
storageClassName: standard
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 250Mi
---
apiVersion: v1
kind: Service
metadata:
name: some-mysql
labels:
app: practice-app
spec:
ports:
- port: 3306
selector:
app: practice-app
tier: mysql
clusterIP: None
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: some-mysql
labels:
app: practice-app
spec:
selector:
matchLabels:
app: practice-app
tier: mysql
strategy:
type: Recreate
template:
metadata:
labels:
app: practice-app
tier: mysql
spec:
containers:
- image: mysql:5.6
name: mysql
env:
- name: MYSQL_ROOT_PASSWORD
valueFrom:
secretKeyRef:
name: mysql-root-pass
key: password
- name: MYSQL_DATABASE
valueFrom:
secretKeyRef:
name: mysql-db-url
key: database
- name: MYSQL_USER
valueFrom:
secretKeyRef:
name: mysql-user-pass
key: username
- name: MYSQL_PASSWORD
valueFrom:
secretKeyRef:
name: mysql-user-pass
key: password
ports:
- containerPort: 3306
name: mysql
volumeMounts:
- name: mysql-persistent-storage
mountPath: /var/lib/mysql
volumes:
- name: mysql-persistent-storage
persistentVolumeClaim:
claimName: mysql-pv-claim
Файл развертывания Kubernetes Spring Boot
apiVersion: apps/v1 # API version
kind: Deployment # Type of kubernetes resource
metadata:
name: order-app-server # Name of the kubernetes resource
labels: # Labels that will be applied to this resource
app: order-app-server
spec:
replicas: 1 # No. of replicas/pods to run in this deployment
selector:
matchLabels: # The deployment applies to any pods mayching the specified labels
app: order-app-server
template: # Template for creating the pods in this deployment
metadata:
labels: # Labels that will be applied to each Pod in this deployment
app: order-app-server
spec: # Spec for the containers that will be run in the Pods
imagePullSecrets:
- name: testXxxxxsecret
containers:
- name: order-app-server
image: XXXXXX/order:latest
ports:
- containerPort: 8080 # The port that the container exposes
env: # Environment variables supplied to the Pod
- name: SPRING_DATASOURCE_USERNAME # Name of the environment variable
valueFrom: # Get the value of environment variable from kubernetes secrets
secretKeyRef:
name: mysql-user-pass
key: username
- name: SPRING_DATASOURCE_PASSWORD
valueFrom:
secretKeyRef:
name: mysql-user-pass
key: password
- name: SPRING_DATASOURCE_URL
valueFrom:
secretKeyRef:
name: mysql-db-url
key: url
---
apiVersion: v1 # API version
kind: Service # Type of the kubernetes resource
metadata:
name: order-app-server-service # Name of the kubernetes resource
labels: # Labels that will be applied to this resource
app: order-app-server
spec:
type: LoadBalancer # The service will be exposed by opening a Port on each node and proxying it.
selector:
app: order-app-server # The service exposes Pods with label `app=polling-app-server`
ports: # Forward incoming connections on port 8080 to the target port 8080
- name: http
port: 8080
Приложение весенней загрузки yml
spring:
application:
name: order-service
datasource:
url: jdbc:mysql://some-mysql:3306/practicecommerce?autoReconnect=true&failOverReadOnly=false&maxReconnects=10&useSSL=false&allowPublicKeyRetrieval=true
username: prac
password: prac
jpa:
hibernate:
naming:
physical-strategy: org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl
ddl-auto: update
properties:
hibernate.dialect: org.hibernate.dialect.MySQL5InnoDBDialect
show-sql: true
server:
port: 8080