如何从 docker 化 spring 启动应用程序连接 docker 数据库？

Question

我是 docker 东西的初学者，我尝试学习，但我很难坚持。

当我仅运行来自 docker-compose.yml 和运行的数据库时，spring 应用调用了 docker deneme 直接来自 IDE 然后它连接到数据库，没问题。但是当我尝试从 docker-compose.yml 文件中同时对运行进行操作时，应用程序无法连接到数据库。我的 docker-compose.yml 文件是：

version: '3.9'

services:
  mysql:
    platform: linux/amd64
    image: mysql:8
    container_name: mysqlcustomerdb
    domainname: nishcustomer
    hostname: localhost
    ports:
      - '3306:3306'
    volumes:
      - ~/apps/mysql:/var/lib/mysql
    environment:
      - MYSQL_ROOT_PASSWORD=1234
      - MYSQL_PASSWORD=1234
      - MYSQL_DATABASE=mysqlcustomerdb
      - DATABASE_HOST=mysqlcustomerdb
      - MYSQL_ROOT_HOST=%
      - lower_case_table_names=1
      - init-connect='GRANT CREATE USER ON . TO 'root'@'%';FLUSH PRIVILEGES;'

  dockerdeneme:
    container_name: dockerdeneme
    domainname: nishcustomer
    hostname: localhost
    image: dockerdeneme
    build: ./
    ports:
      - '8080:8080'
    environment:
      - MYSQL_ROOT_PASSWORD=1234
      - MYSQL_PASSWORD=1234
      - MYSQL_USER=root
      - MYSQL_DATABASE=mysqlcustomerdb
    depends_on:
      - mysql
volumes:
  cache:
    driver: local

docker ps的结果是：

CONTAINER ID   IMAGE           COMMAND                  CREATED             STATUS             PORTS                               NAMES
fb0037e10702   mysql:8         "docker-entrypoint.s…"   22 seconds ago      Up 21 seconds      0.0.0.0:3306->3306/tcp, 33060/tcp   mysqlcustomerdb

如果我运行来自 IDE 的应用程序和以下 application.properties 那么它运行良好：

spring.datasource.url=jdbc:mysql://localhost:3306/mysqlcustomerdb
spring.datasource.username=root
spring.datasource.password=1234
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

这是docker化应用失败的输出：

2022-04-14 21:28:56.106  INFO 1 --- [           main] c.e.d.DockerdenemeApplication            : Starting DockerdenemeApplication v0.0.1-SNAPSHOT using Java 11.0.14.1 on localhost with PID 1 (/app.jar started by root in /)

2022-04-14 21:28:56.107  INFO 1 --- [           main] c.e.d.DockerdenemeApplication            : No active profile set, falling back to 1 default profile: "default"

2022-04-14 21:28:56.467  INFO 1 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.

2022-04-14 21:28:56.493  INFO 1 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 21 ms. Found 1 JPA repository interfaces.

2022-04-14 21:28:57.024  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)

2022-04-14 21:28:57.037  INFO 1 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]

2022-04-14 21:28:57.037  INFO 1 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.60]

2022-04-14 21:28:57.105  INFO 1 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext

2022-04-14 21:28:57.105  INFO 1 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 937 ms

2022-04-14 21:28:57.250  INFO 1 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...

2022-04-14 21:28:57.256  WARN 1 --- [           main] com.zaxxer.hikari.util.DriverDataSource  : Registered driver with driverClassName=com.mysql.jdbc.Driver was not found, trying direct instantiation.

2022-04-14 21:28:58.334 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-8.0.28.jar!/:8.0.28]

我想我在端口映射或 hostname/domain 名称方面做错了，但我卡住了。

谁能告诉我我做错了什么，端口或主机名等？

Answer 1

localhost 不适用于 docker-compose 应用程序。作为总结，使用主机的 ip 或配置良好的 docker 网络。检查：

特别注意：extra_hosts:

How to connect API with Web SPA through docker

这里有一个与 mysql 和 wordpress 类似的 docker-compose：

https://github.com/usil/wordpress-docker/blob/master/docker-compose.yml

如何从 docker 化 spring 启动应用程序连接 docker 数据库？

How to connect docker db from dockerized spring boot app?

docker

spring-boot

docker-compose