Question

我已经用MySQL为我的SpringBoot应用程序编写了docker compose。当我最终运行docker-compose时，出现错误：

 The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
      at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80) ~[spring-jdbc-4.3.17.RELEASE.jar!/:4.3.17.RELEASE]
      at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:325) ~[spring-jdbc-4.3.17.RELEASE.jar!/:4.3.17.RELEASE]
      ... 69 common frames omitted
  Caused by: 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:172) ~[mysql-connector-java-8.0.11.jar!/:8.0.11]
      at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64) ~[mysql-connector-java-8.0.11.jar!/:8.0.11]
      at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:862) ~[mysql-connector-java-8.0.11.jar!/:8.0.11]
      at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:444) ~[mysql-connector-java-8.0.11.jar!/:8.0.11]
      at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:230) ~[mysql-connector-java-8.0.11.jar!/:8.0.11]
      at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:226) ~[mysql-connector-java-8.0.11.jar!/:8.0.11]
      at java.sql.DriverManager.getConnection(DriverManager.java:664) ~[na:1.8.0_111]
      at java.sql.DriverManager.getConnection(DriverManager.java:208) ~[na:1.8.0_111]
      at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriverManager(DriverManagerDataSource.java:153) ~[spring-jdbc-4.3.17.RELEASE.jar!/:4.3.17.RELEASE]
      at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriver(DriverManagerDataSource.java:144) ~[spring-jdbc-4.3.17.RELEASE.jar!/:4.3.17.RELEASE]
      at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnectionFromDriver(AbstractDriverBasedDataSource.java:196) ~[spring-jdbc-4.3.17.RELEASE.jar!/:4.3.17.RELEASE]
      at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnection(AbstractDriverBasedDataSource.java:159) ~[spring-jdbc-4.3.17.RELEASE.jar!/:4.3.17.RELEASE]
      at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111) ~[spring-jdbc-4.3.17.RELEASE.jar!/:4.3.17.RELEASE]
      at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77) ~[spring-jdbc-4.3.17.RELEASE.jar!/:4.3.17.RELEASE]
      ... 70 common frames omitted
  Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure

起初，我认为原因是数据库，但我设法运行了应用程序的本地实例并连接到docker mysql。接下来，我假设spring应用程序在启动并运行之前尝试连接到mysql，但是我重新启动了该应用程序（mysql已在运行）并遇到了相同的错误。目前，我认为这可能是Windows10防火墙引起的，但我的想法不足。

Dockerfile：

FROM java:8
LABEL maintainer="maciej"
WORKDIR /app
COPY target/kamienica.jar /app/kamienica.jar
ENTRYPOINT ["java", "-jar","kamienica.jar", "--spring.profiles.active=docker"]

docker-compose.yml

version: '3'

services:
  mysql-docker-container:
    image: mysql:latest
    environment:
      - MYSQL_ROOT_PASSWORD=maciej
      - MYSQL_DATABASE=kamienica
      - MYSQL_USER=maciej
      - MYSQL_PASSWORD=maciej
    volumes:
      - /data/mysql
    ports:
    - 3333:3306
    container_name: kamienica-db
  kamienica-app:
    image: kamienica-image
    build:
      context: ./
      dockerfile: Dockerfile
    depends_on:
      - mysql-docker-container
    ports:
      - 8080:8080
    volumes:
      - /data/spring-boot-app
    container_name: kamienica-app

和application-docker.properties：

jdbc.url = jdbc:mysql://kamienica-db:3333/kamienica?useSSL=false&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
jdbc.username = maciej
jdbc.password = maciej
hibernate.show_sql = true
hibernate.format_sql = true
hibernate.hbm2ddl.auto=create-drop
hibernate.dialect=org.hibernate.dialect.MySQLDialect
hibernate.current_session_context_class=thread
hibernate.connection.characterEncoding=UTF-8
hibernate.connection.charSet=UTF-8

Answer 1

尝试将URL更改为此属性文件

jdbc：mysql：// mysql-docker-container：3306 / kamienica

Answer 2

jdbc：mysql：// [mysql-docker-container-name]：[mysql-port] / [db-name]

在您的docker-compose.yml中，mysql-docker-container名称为mysql-docker-container

因此，请按以下方式更改您的spring boot application.properties文件mysql网址

jdbc：mysql：// mysql-docker-container：3306 / kamienica

Docker上的SpringBoot无法连接到MySQL

2 个答案: