在 App Engine 上部署了 Hibernate 的 Spring Boot 应用无法连接到云 SQL

Question

我有一个部署在 App Engine 上的 SpringBoot 应用程序，我的数据库是 MySQL8。对于我的本地测试，我可以使用 public IP 连接到云数据库并且连接工作正常。

但是在 App Engine 上部署此应用程序时出现错误：

2021-11-09 01:44:50 default[1]  2021-11-09 01:44:50.874  INFO 10 --- [           main] org.hibernate.Version                    : HHH000412: Hibernate ORM core version 5.4.25.Final
2021-11-09 01:44:51 default[1]  2021-11-09 01:44:51.092  INFO 10 --- [           main] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {5.1.2.Final}
2021-11-09 01:46:58 default[1]  2021-11-09 01:46:58.343  WARN 10 --- [           main] o.h.e.j.e.i.JdbcEnvironmentInitiator     : HHH000342: Could not obtain connection to query metadata
2021-11-09 01:46:58 default[1]
2021-11-09 01:46:58 default[1]  com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure
2021-11-09 01:46:58 default[1]
2021-11-09 01:46:58 default[1]  The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
2021-11-09 01:46:58 default[1]      at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174) ~[mysql-connector-java-8.0.26.jar!/:8.0.26]
2021-11-09 01:46:58 default[1]      at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64) ~[mysql-connector-java-8.0.26.jar!/:8.0.26]

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

Caused by: java.net.ConnectException: Connection timed out (Connection timed out)

我已按照文档中提到的步骤进行操作： https://cloud.google.com/sql/docs/mysql/connect-app-engine-standard

app.yaml

runtime: java11
instance_class: F2
entrypoint: java -noverify -jar strategy-0.0.1-SNAPSHOT.war

application.properties

#spring.datasource.url=jdbc:mysql://35.345.11.132:3306/fin_strat
spring.datasource.url=jdbc:mysql://localhost:3306/fin_strat
spring.datasource.username=<database-user-name>
spring.datasource.password=<database-password>
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

我不确定从 App Engine 连接时我错过了什么。请协助。

Answer 1

当您使用 APP ENgine（或 Cloud Functions 或 Cloud 运行）中的 Cloud SQL 功能连接您的 Cloud SQL 数据库时，该服务会打开一个套接字来连接数据库。您不必使用 public IP，而是打开的套接字。

它类似于套接字模式下的云 SQL 代理。您有包含 Java 示例 here

的文档

在 App Engine 上部署了 Hibernate 的 Spring Boot 应用无法连接到云 SQL

SpringBoot App with Hibernate deployed on App Engine failed connecting to Cloud SQL

google-app-engine

google-cloud-sql

google-cloud-platform