我想对我的spring boot应用程序进行docker化。我用
docker build -t <Name> .
构建我的项目，然后尝试运行它。但是我的spring boot应用程序出现Communication link失败，无法连接到rds数据库。我在属性文件中正确设置了数据库URL，并且我的应用程序与RDS位于同一VPC中。我的docker文件是：
FROM maven:3.5.2-jdk-8-alpine AS MAVEN_TOOL_CHAIN
COPY pom.xml /tmp/
WORKDIR /tmp/
RUN mvn verify clean --fail-never
COPY src /tmp/src/
RUN mvn package -DskipTests
FROM tomcat:8.0.51-jre8-alpine
COPY --from=MAVEN_TOOL_CHAIN /tmp/target/<ProjectName>.war $CATALINA_HOME/webapps/<ProjectName>.war
COPY ./conf/* $CATALINA_HOME/conf/
CMD ["catalina.sh","run"]
我得到的错误的堆栈跟踪如下：
2019-03-14 14:17:03.400 WARN 1 --- [pool-3-thread-1] o.h.e.j.s.SqlExceptionHelper : SQL Error: 0, SQLState: 08S01
2019-03-14 14:17:03.400 ERROR 1 --- [pool-3-thread-1] o.h.e.j.s.SqlExceptionHelper : 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.
2019-03-14 14:17:03.400 INFO 1 --- [pool-3-thread-1] c.d.c.s.c.CampaignAnalyticsService : error in updating analytics Could not open JPA EntityManager for transaction; nested exception is org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection
2019-03-14 14:17:03.400 INFO 1 --- [pool-3-thread-1] c.d.c.s.c.CampaignAnalyticsService : [543, Send, Announcement, -, Sukhna:, Run, for, fun]
2019-03-14 14:17:03.401 INFO 1 --- [pool-3-thread-1] c.z.h.HikariDataSource : HikariPool-1 - Starting...
2019-03-14 14:17:04.402 ERROR 1 --- [pool-3-thread-1] c.z.h.p.HikariPool : HikariPool-1 - Exception during pool initialization.
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.
我使用以下命令来运行我的映像：
docker run -p 8081:8000 <Name>