同一网络上的容器无法相互通信

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我有一个 mongodb 容器，我将其命名为 e-learning 我有一个 docker 映像，它应该连接到 mongodb 容器来更新我的数据库，但它不起作用，我收到此错误：

未知，最后一个错误：连接握手期间发生连接（）错误：拨打 tcp 127.0.0.1:27017：连接：连接被拒绝 }

这是我的 docker 构建文件

# syntax=docker/dockerfile:1 
from golang:1.18 
workdir /go/src/github.com/worker 
copy go.mod go.sum main.go  ./ 
run go mod download 
run cgo_enabled=0 goos=linux go build -a -installsuffix cgo -o app . 
from jrottenberg/ffmpeg:4-alpine   

from alpine:latest 
run apk --no-cache add ca-certificates 
workdir /root/ 
env ld_library_path=/usr/local/lib 
copy --from=jrottenberg/ffmpeg / / 
copy app.env /root 
copy --from=0 /go/src/github.com/worker/app . 
cmd ["./app"]

我的 docker 撰写文件

version: "3.9"

services:
  worker:
    image: worker
    environment:
     - mongo_uri="mongodb://localhost:27017/"
     - mongo_database=e-learning 
     - rabbitmq_uri=amqp://user:password@rabbitmq:5672/
     - rabbitmq_queue=upload
    networks:
     - app_network
    external_links:
     - e-learning
     - rabbitmq
    volumes:
      - worker:/go/src/github.com/worker:rw

networks:
 app_network:
  external: true
volumes:
  worker:

我的docker检查网络

[
    {
        "Name": "app_network",
        "Id": "f688edf02a194fd3b8a2a66076f834a23fa26cead20e163cde71ef32fc1ab598",
        "Created": "2022-06-27T12:18:00.283531947+03:00",
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": {},
            "Config": [
                {
                    "Subnet": "172.20.0.0/16",
                    "Gateway": "172.20.0.1"
                }
            ]
        },
        "Internal": false,
        "Attachable": false,
        "Ingress": false,
        "ConfigFrom": {
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {
            "2907482267e1f6e42544e5e8d852c0aac109ec523c6461e003572963e299e9b0": {
                "Name": "rabbitmq",
                "EndpointID": "4b46e091e4d5a79782185dce12cb2b3d79131b92d2179ea294a639fe82a1e79a",
                "MacAddress": "02:42:ac:14:00:03",
                "IPv4Address": "172.20.0.3/16",
                "IPv6Address": ""
            },
            "8afd004a981715b8088af53658812215357e156ede03905fe8fdbe4170e8b13f": {
                "Name": "e-learning",
                "EndpointID": "1c12d592a0ef6866d92e9989f2e5bc3d143602fc1e7ad3d980efffcb87b7e076",
                "MacAddress": "02:42:ac:14:00:02",
                "IPv4Address": "172.20.0.2/16",
                "IPv6Address": ""
            },
            "ad026f7e10c9c1c41071929239363031ff72ad1b9c6765ef5c977da76f24ea31": {
                "Name": "video-transformation-worker-1",
                "EndpointID": "ce3547014a6856725b6e815181a2c3383d307ae7cf7132e125c58423f335b73f",
                "MacAddress": "02:42:ac:14:00:04",
                "IPv4Address": "172.20.0.4/16",
                "IPv6Address": ""
            }
        },
        "Options": {},
        "Labels": {}
    }
]

正确答案

我添加了额外的主机并将我的 mongo uri 更改为 host.docker.internal 它解决了我的问题

version: "3.9"

services:
  worker:
    image: worker
    environment:
     - MONGO_URI="mongodb://host.docker.internal:27017/"
     - MONGO_DATABASE=e-learning 
     - RABBITMQ_URI=amqp://user:password@rabbitmq:5672/
     - RABBITMQ_QUEUE=upload
    networks:
     - app_network
    external_links:
     - e-learning
     - rabbitmq
    volumes:
      - worker:/go/src/github.com/worker:rw
    extra_hosts:
      - "host.docker.internal:host-gateway"

networks:
 app_network:
  external: true
volumes:
  worker:

将 mongo_uri="mongodb://localhost:27017/" 更改为 mongo_uri="mongodb://e-learning:27017/" （假设 e-learning 是 mongo 容器）。

在附加到 bridge network（默认）本地主机 (127.0.0.1) 的容器内是容器本身。因此，您的应用程序容器正在尝试访问自身（而不是主机或数据库容器上）端口 27017 处的数据库。最简单的解决方案是使用docker提供的automatic DNS resolution between containers。

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