Unable to acquire JDBC Connection但是本地测试可以连接

Question

Jenkins跑集成测试报错，本地测试通过。数据库脚本是最新的，登录docker查看有最新的表

Error Message
Could not open JPA EntityManager for transaction; nested exception is org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection
Stacktrace
org.springframework.transaction.CannotCreateTransactionException: Could not open JPA EntityManager for transaction; nested exception is org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection
Caused by: org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: 
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.
Caused by: java.net.SocketTimeoutException: connect timed out    

Spring Boot的项目，用到了JPA。在CI服务器，用 mysql -hprivateAddress -u username -p 可以连上
privateAddress是docker 里面的MySQL的custom的bridge地址。show tables也可以看到最新的表。
CI服务器只装了MySQL client core没装server，docker里装的MySQL官方镜像。

Spring Boot application.properties 配置相关行

spring.datasource.url=jdbc:mysql://privateAddress:3306/dems?useLegacyDatetimeCode=false&serverTimezone=Asia/Shanghai
spring.datasource.username=username
spring.datasource.password=password

spring.jpa.properties.hibernate.id.new_generator_mappings=false
spring.jpa.database-platform=org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.hibernate.ddl-auto=none

想不明白是哪里的问题。