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我有三个 docker 容器（postgresql、adminer 和 go/migrate），并且我已经向主机公开了 adminer 和 postgres 端口。我可以在浏览器中访问管理员，postico 也可以连接到数据库。当我尝试从管理员内部连接到数据库时，它会引发此错误：

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?

迁移容器也会抛出此错误：

error: dial tcp: 127.0.0.1:5432: connect: connection refused

因此，显然容器之间如何通信存在问题。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
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1 回答 1

6

不需要创建链接，docker-compose 创建默认网络。服务到服务的通信也应该使用服务名称，localhost这意味着这个容器（迁移）不是DB容器。

更改localhost为db

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

正如您DB的服务名称一样db，您可以使用它的名称与db容器连接。

于 2020-05-04T13:49:18.400 回答