从一个Docker容器连接到另一个 [英] Connect from one Docker container to the other one

问题描述

我正在Docker容器中运行Java应用程序，该容器应该将MySQL连接到另一个容器中。尝试使用表格中建议的多个选项，但实际上没有任何效果。这是我的Docker Compose文件：

I am running a Java app inside a Docker container which is supposed to connect MySQL inside the other container. Trying multiple options suggested in the forms, nothing really works. Here is my Docker Compose file:

version: "3"
services:

  app:
    build:
      context: ./
      dockerfile: /src/main/docker/Dockerfile
    image: app1
    environment:
      - DB_HOST=Imrans-MacBook-Pro.local
      - DB_PORT=3306
    ports:
      - 8080:8080
    networks:
      - backend
    depends_on:
      - mysql



  mysql:
    image: mysql:5.7.20
    hostname: mysql
    environment:
      - MYSQL_USER=root
      - MYSQL_ALLOW_EMPTY_PASSWORD=yes
      - MYSQL_DATABASE=app1
    ports:
      - 3306:3306
    command: mysqld --lower_case_table_names=1 --skip-ssl --character_set_server=utf8 --explicit_defaults_for_timestamp
    networks:
      - backend

networks:
  backend:
    driver: bridge

其中 DB_HOST = Imrans-MacBook-Pro.local 是我的笔记本电脑的名称。这没有用。有人建议可以使用容器名称，因此可以尝试 DB_HOST = mysql ，但从未成功。

Where DB_HOST=Imrans-MacBook-Pro.local is my laptop's name. This did not work. Some suggest that the container name can be used so tried DB_HOST= mysql, never worked.

唯一有效的方法我不时通过笔记本电脑的IP地址，这不是我想要的。因此，在这些容器之间创建通信的一种好方法是什么？

The only thing works from times to time when I pass the laptop's IP address, which is not I want to do. So, what is a good way to create communication between those containers?

推荐答案

我过去曾经使它起作用无需在Docker Compose中显式设置主机网络部分。因为Docker Docker Compose文件中的图像相互放置在Docker网络中，所以您真的不需要做任何事情就可以使它起作用：默认情况下，您应该能够将其附加到Spring应用程序的容器中，并能够 ping mysql 并具有可以解决。

I have, in the past, gotten this to work without explicitly setting the host networking part in Docker Compose. Because Docker images inside a Docker Compose File are put into a Docker Network with each other, you really shouldn't have to do anything to get this to work: by default you should be able to attach into the container for your Spring app and be able to ping mysql and have it work out.

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