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Question

我有三个docker容器（postgresql、adminer和go/migrate），我向主机公开了adminer和postgres端口。我可以在浏览器中访问adminer，Postco也可以连接到DB。当我尝试从adminer内连接到db时，它会抛出以下错误：

SQLSTATE[08006] [7] could not connect to server: Connection refused
Is the server running on host "localhost" (127.0.0.1) and accepting TCP/IP
connections on port 5432? could not connect to server: Address not available
Is the server running on host "localhost" (::1) and accepting TCP/IP connections on port 5432?

迁移容器也会引发此错误：

错误：拨tcp：127.0.0.1:5432：连接：拒绝连接

因此，很明显，容器之间如何相互通信存在问题。我需要创建一个docker网络吗？

version: '3.1'

services:
  db:
    image: postgres
    environment:
        POSTGRES_DB: mydbname
        POSTGRES_USER: mydbuser
        POSTGRES_PASSWORD: mydbpwd
    ports:
      - "5432:5432"

  migrate:
    image: migrate/migrate
    volumes:
        - .:/migrations
    command: ["-database", "postgres://mydbuser:mydbpwd@localhost:5432/mydbname?sslmode=disable", "-path", "/migrations", "up"]
    links: 
        - db

  adminer:
    image: adminer
    restart: always
    ports:
      - "8081:8080"
    depends_on:
      - db

Answer 1

您不需要创建链接，docker compose创建默认网络。此外，服务到服务的通信应使用服务名称，localhost表示此容器（迁移），而不是DB容器。

将localhost更改为db

  migrate:
    image: migrate/migrate
    volumes:
        - .:/migrations
    command: ["-database", "postgres://mydbuser:mybpwd@db:5432/mydbname?sslmode=disable", "-path", "/migrations", "up"]

因为您的DB服务名称是db，所以您使用它的名称连接db容器。