Java 为什么我的spring boot Dockerfile可以'；无法连接到AWS RDS？

我正在创建一个spring引导Api。该Api使用远程数据库（RDS）。当我在我的机器上运行它时，应用程序可以正常连接到数据源，但当我构建Docker映像并运行它时，它无法连接

我的Dockerfile：

FROM openjdk:11-jre-slim
RUN groupadd -r fps && useradd --no-log-init -r -g fps flavio
USER flavio
ARG DEPENDENCY=target/dependency
COPY ${DEPENDENCY}/BOOT-INF/lib /app/lib
COPY ${DEPENDENCY}/META-INF app/META-INF
COPY ${DEPENDENCY}/BOOT-INF/classes /app
ENTRYPOINT ["java","-cp","app:app/lib/*","com.fps.app.FpsApplication"]

My application.properties：

server.port=8080


spring.datasource.url=jdbc:mysql://my_db_endpoint?useSSL=false&useLegacyDatetimeCode=false
spring.datasource.username=my_username
spring.datasource.password=my_pwd

spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=update

spring.jpa.database-platform=org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.properties.hibernate.jdbc.time_zone=UTC

spring.jackson.serialization.WRITE_DATES_AS_TIMESTAMPS = false

cloud.aws.credentials.accessKey=my_access
cloud.aws.credentials.secretKey=my_secret

cloud.aws.credentials.useDefaultAwsCredentialsChain=true
cloud.aws.region.useDefaultAwsRegionChain=true
cloud.aws.stack.auto=false

logging.level.com.amazonaws.utils.EC2MetadataUtils=error

洛金：

2021-04-21 12:11:10.420  INFO 1 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...
2021-04-21 12:11:11.542 ERROR 1 --- [           main] com.zaxxer.hikari.pool.HikariPool        : HikariPool-1 - Exception during pool initialization.

com.mysql.cj.jdbc.exceptions.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.
    at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174) ~[mysql-connector-java-8.0.23.jar:8.0.23]
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64) ~[mysql-connector-java-8.0.23.jar:8.0.23]
    at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:833) ~[mysql-connector-java-8.0.23.jar:8.0.23]
    at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:453) ~[mysql-connector-java-8.0.23.jar:8.0.23]
    at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:246) ~[mysql-connector-java-8.0.23.jar:8.0.23]
    at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:198) ~[mysql-connector-java-8.0.23.jar:8.0.23]
    at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:138) ~[HikariCP-3.4.5.jar:na]
    at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:358) ~[HikariCP-3.4.5.jar:na]
    at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:206) ~[HikariCP-3.4.5.jar:na]
    at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:477) ~[HikariCP-3.4.5.jar:na]
    at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:560) ~[HikariCP-3.4.5.jar:na]
    at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:115) ~[HikariCP-3.4.5.jar:na]
    at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:112) ~[HikariCP-3.4.5.jar:na]
    at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:122) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
    at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator$ConnectionProviderJdbcConnectionAccess.obtainConnection(JdbcEnvironmentInitiator.java:180) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
    at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:68) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
    at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:35) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
    at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:101) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:263) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:237) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:214) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
    at org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.injectServices(DefaultIdentifierGeneratorFactory.java:152) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.injectDependencies(AbstractServiceRegistryImpl.java:286) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:243) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:214) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
    at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.<init>(InFlightMetadataCollectorImpl.java:176) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:127) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:1224) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:1255) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
    at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:58) ~[spring-orm-5.3.4.jar:5.3.4]
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365) ~[spring-orm-5.3.4.jar:5.3.4]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:409) ~[spring-orm-5.3.4.jar:5.3.4]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:396) ~[spring-orm-5.3.4.jar:5.3.4]
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341) ~[spring-orm-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1845) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1782) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:602) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1153) ~[spring-context-5.3.4.jar:5.3.4]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:907) ~[spring-context-5.3.4.jar:5.3.4]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:582) ~[spring-context-5.3.4.jar:5.3.4]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144) ~[spring-boot-2.4.3.jar:2.4.3]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:767) ~[spring-boot-2.4.3.jar:2.4.3]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) ~[spring-boot-2.4.3.jar:2.4.3]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:426) ~[spring-boot-2.4.3.jar:2.4.3]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:326) ~[spring-boot-2.4.3.jar:2.4.3]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1311) ~[spring-boot-2.4.3.jar:2.4.3]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1300) ~[spring-boot-2.4.3.jar:2.4.3]
    at com.fps.app.FpsApplication.main(FpsApplication.java:15) ~[app/:na]
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 java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[na:na]
    at java.base/java.lang.reflect.Constructor.newInstance(Unknown Source) ~[na:na]
    at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61) ~[mysql-connector-java-8.0.23.jar:8.0.23]
    at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105) ~[mysql-connector-java-8.0.23.jar:8.0.23]
    at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151) ~[mysql-connector-java-8.0.23.jar:8.0.23]
    at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:167) ~[mysql-connector-java-8.0.23.jar:8.0.23]
    at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:89) ~[mysql-connector-java-8.0.23.jar:8.0.23]
    at com.mysql.cj.NativeSession.connect(NativeSession.java:144) ~[mysql-connector-java-8.0.23.jar:8.0.23]
    at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:953) ~[mysql-connector-java-8.0.23.jar:8.0.23]
    at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:823) ~[mysql-connector-java-8.0.23.jar:8.0.23]
    ... 50 common frames omitted
Caused by: java.net.ConnectException: Connection refused (Connection refused)
    at java.base/java.net.PlainSocketImpl.socketConnect(Native Method) ~[na:na]
    at java.base/java.net.AbstractPlainSocketImpl.doConnect(Unknown Source) ~[na:na]
    at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source) ~[na:na]
    at java.base/java.net.AbstractPlainSocketImpl.connect(Unknown Source) ~[na:na]
    at java.base/java.net.SocksSocketImpl.connect(Unknown Source) ~[na:na]
    at java.base/java.net.Socket.connect(Unknown Source) ~[na:na]
    at com.mysql.cj.protocol.StandardSocketFactory.connect(StandardSocketFactory.java:155) ~[mysql-connector-java-8.0.23.jar:8.0.23]
    at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:63) ~[mysql-connector-java-8.0.23.jar:8.0.23]
    ... 53 common frames omitted

2021-04-21 12:11:11.544  WARN 1 --- [           main] o.h.e.j.e.i.JdbcEnvironmentInitiator     : HHH000342: Could not obtain connection to query metadata

2021-04-21 12:11:10.420信息1---[main]com.zaxxer.hikari.HikariDataSource:hikaripol-1-正在启动。。。
2021-04-21 12:11:11.542错误1---[main]com.zaxxer.hikari.pool.HikariPool:HikariPool-1-池初始化期间出现异常。
com.mysql.cj.jdbc.exceptions.CommunicationsException：通信链路故障
成功发送到服务器的最后一个数据包是0毫秒前的。驱动程序尚未从服务器收到任何数据包。
在com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException（SQLError.java:174）~[mysql-connector-java-8.0.23.jar:8.0.23]
在com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException（SQLExceptionsMapping.java:64）~[mysql-connector-java-8.0.23.jar:8.0.23]
在com.mysql.cj.jdbc.ConnectionImpl.createNewIO（ConnectionImpl.java:833）~[mysql-connector-java-8.0.23.jar:8.0.23]
在com.mysql.cj.jdbc.ConnectionImpl.（ConnectionImpl.java:453）~[mysql-connector-java-8.0.23.jar:8.0.23]
在com.mysql.cj.jdbc.ConnectionImpl.getInstance（ConnectionImpl.java:246）~[mysql-connector-java-8.0.23.jar:8.0.23]
在com.mysql.cj.jdbc.NonRegisteringDriver.connect（NonRegisteringDriver.java:198）~[mysql-connector-java-8.0.23.jar:8.0.23]
在com.zaxxer.hikari.util.DriverDataSource.getConnection（DriverDataSource.java:138）~[HikariCP-3.4.5.jar:na]
在com.zaxxer.hikari.pool.PoolBase.newConnection（PoolBase.java:358）~[HikariCP-3.4.5.jar:na]
在com.zaxxer.hikari.pool.PoolBase.newPoolEntry（PoolBase.java:206）~[HikariCP-3.4.5.jar:na]
在com.zaxxer.hikari.pool.HikariPool.createPoolEntry（HikariPool.java:477）~[HikariCP-3.4.5.jar:na]
在com.zaxxer.hikari.pool.HikariPool.checkFailFast（HikariPool.java:560）~[HikariCP-3.4.5.jar:na]
在com.zaxxer.hikari.pool.HikariPool.（HikariPool.java:115）~[HikariCP-3.4.5.jar:na]
在com.zaxxer.hikari.HikariDataSource.getConnection（HikariDataSource.java:112）~[HikariCP-3.4.5.jar:na]
在org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection（DatasourceConnectionProviderImpl.java:122）~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
在org.hibernate.engine.jdbc.env.internal.jdbconvironmentinitiator$connectionProviderjdbconnectionAccess.获得连接（jdbconvironmentinitiator.java:180）~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
在org.hibernate.engine.jdbc.env.internal.jdbconvironmentinitiator.initiateService（jdbconvironmentinitiator.java:68）~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
在org.hibernate.engine.jdbc.env.internal.jdbconvironmentinitiator.initiateService（jdbconvironmentinitiator.java:35）~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
在org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService（StandardServiceRegistryImpl.java:101）~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
在org.hibernate.service.internal.AbstractServiceRegistryImpl.createService（AbstractServiceRegistryImpl.java:263）~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
在org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService（AbstractServiceRegistryImpl.java:237）~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
在org.hibernate.service.internal.AbstractServiceRegistryImpl.getService（AbstractServiceRegistryImpl.java:214）~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
在org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.injectServices（DefaultIdentifierGeneratorFactory.java:152）~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
在org.hibernate.service.internal.AbstractServiceRegistryImpl.injectDependencies（AbstractServiceRegistryImpl.java:286）~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
在org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService（AbstractServiceRegistryImpl.java:243）~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
在org.hibernate.service.internal.AbstractServiceRegistryImpl.getService（AbstractServiceRegistryImpl.java:214）~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
在org.hibernate.boot.internal.InFlightMetadataCollectorImpl.（InFlightMetadataCollectorImpl.java:176）~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
在org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete（MetadataBuildingProcess.java:127）~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
在org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata（EntityManagerFactoryBuilderImpl.java:1224）~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
在org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build（EntityManagerFactoryBuilderImpl.java:1255）~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
在org.springframework.orm.jpa.vendor.springhibernatejbapersistenceprovider.createContainerEntityManager工厂（springhibernatejbapersistenceprovider.java:58）~[spring-orm-5.3.4.jar:5.3.4]
在org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory（LocalContainerEntityManagerFactoryBean.java:365）~[spring-orm-5.3.4.jar:5.3.4]
在org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory（AbstractEntityManagerFactoryBean.java:409）~[spring-orm-5.3.4.jar:5.3.4]
在org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.AfterPropertieSet（AbstractEntityManagerFactoryBean.java:396）~[spring-orm-5.3.4.jar:5.3.4]
在org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet（LocalContainerEntityManagerFactoryBean.java:341）~[spring-orm-5.3.4.jar:5.3.4]
位于org.springframework.beans.factory.support.AbstractAutowireCapab