Question

我有一个spring-boot 2.16服务，该服务连接到my-sql数据库。只要所有组件都在同一主机上，它就可以按预期工作。我试图改进解决方案，并让一个运行有嵌入式Tomcat的sprin-boot服务的docker容器和另一个运行my-sql服务器的docker容器。相同的代码不再起作用。例外：

 2019-06-28 12:23:48 ERROR com.zaxxer.hikari.pool.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.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at  sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:988)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:341)
....
Caused by: java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:211)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:300)
... 66 common frames omitted

因此，这就像找不到MySQL服务器IP地址或服务器未运行，等等。这是docker-compse.yml文件：

version: "2"
services:
  rdf-data:
    container_name: rdf-data
    image: mysql:latest
    environment:
      MYSQL_DATABASE: test
      MYSQL_USER: nicolas
      MYSQL_PASSWORD: mysql
      MYSQL_ROOT_PASSWORD: mysql
    ports:
      - 3306:3306
      - 33060:33060
    hostname: rdf-data
    networks:
      net1:
        ipv4_address: 192.19.0.4
  rdf-core:
    image: openjdk:8-jdk-alpine
    depends_on:
      - rdf-data
    container_name: rdf-core
    links:
      - rdf-data:rdf-data
    volumes:
      - ../docker:/usr/local/share/rdf
    ports:
      - "8080:8080"
    entrypoint: /usr/local/share/rdf/run.sh
    hostname: rdf-core
    environment:
      PROFILE: "default"
      SERVER_PORT: "8080"
  networks:
    net1:
      ipv4_address: 192.19.0.8
networks:
  net1:
    driver: bridge
    driver_opts:
      com.docker.network.enable_ipv6: "false"
  ipam:
    driver: default
    config:
      - subnet: 192.19.0.0/24
        gateway: 192.19.0.1

这里有两个容器：IP地址为192.19.0.8的rfd-core和IP地址为192.19.0.4的rdf-data。每个容器都可以ping通另一个。 hst机器能够对每个容器执行ping操作。从主机，我可以使用my-sql命令行客户端正确连接到在rfd-data上运行的my-sql服务器。但是，下面显示的我的服务连接不起作用：

database=mysql
spring.datasource.url=jdbc:mysql://192.19.0.4/test?useSSL=false
spring.datasource.username=root
spring.datasource.password=mysql
spring.datasource.driver-class=com.mysql.cj.jdbc.MysqlXADataSource
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.hikari.connectionTimeout=30000
spring.datasource.hikari.idleTimeout=600000
spring.datasource.hikari.maxLifetime=1800000
...

有什么我想念的吗？

Answer 1

尝试在docker-compose文件的环境部分中指定spring boot应用程序的参数：

 rdf-core:
    image: openjdk:8-jdk-alpine
    depends_on:
      - rdf-data
    container_name: rdf-core
        links:
          - rdf-data:rdf-data
        volumes:
          - ../docker:/usr/local/share/rdf
        ports:
          - "8080:8080"
        entrypoint: /usr/local/share/rdf/run.sh
        hostname: rdf-core
        environment:
          PROFILE: "default"
          SERVER_PORT: "8080"
          spring.datasource.url=jdbc:mysql://ipaddress/test?useSSL=false
          spring.datasource.username=root
          spring.datasource.password=mysql
          spring.datasource.driver-class=com.mysql.cj.jdbc.MysqlXADataSource
          spring.datasource.driver-class-name=com.mysql.jdbc.Driver
          spring.datasource.hikari.connectionTimeout=30000
          spring.datasource.hikari.idleTimeout=600000
          spring.datasource.hikari.maxLifetime=1800000

此问题的另一个可能原因：depends_on不保证依赖项容器已完全运行。因此，如果MySQL容器比Spring Boot容器花费更多的时间来完全启动，则连接将失败。

看看这个：

Spring Boot + docker-compose + MySQL: Connection refused

有几种方法可以使容器等待另一个容器：使用restart on failure功能或docker compose wait（ Github link）

无法将Spring Boot 2服务连接到其他容器中的mysql

1 个答案: