Docker 上的 SpringBoot 無法連接到 MySQL

Question

我已經用 MySQL 為我的 SpringBoot 應用程序編寫了 docker compose。 當我最終運行 docker-compose up 時，我收到一個錯誤：

 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

起初我認為原因是數據庫，但我設法運行應用程序的本地實例並連接到 docker mysql。 接下來，我假設 spring 應用程序在啟動並運行之前嘗試連接到 mysql，但我重新啟動了應用程序（mysql 已經在運行）並得到了相同的錯誤。 目前我認為這可能是由 windows10 防火牆引起的，但我的想法很少。

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

和應用程序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

嘗試將 url 更改為您的屬性文件

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

Answer 2

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

在你的 docker-compose.yml mysql-docker-container-name 是 mysql-docker-container

所以改變你的spring boot application.properties文件mysql url如下

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