为什么无法使用 Docker/VScode 进行远程调试？

Question

我正在尝试使用 Docker/VScode 远程调试 Go 应用程序。我的文件看起来像：

• 主程序

package main

    import (
        "log"
        "net"
        "net/http"
        "strings"
    )
    
    func main() {
        http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
            message := r.URL.Path
            message = strings.TrimPrefix(message, "/")
            message = "Hello, " + message + "!"
    
            w.Write([]byte(message))
        })
    
        log.Print("starting web server")
        listener, err := net.Listen("tcp", ":8080")
        if err != nil {
            log.Fatal(err)
        }
    
        log.Printf("Start listening: %v", listener.Addr().String())
    
        if err := http.Serve(listener, nil); err != nil {
            log.Fatal(err)
        }
    }

• Dockerfile

    FROM golang:1.12
    
    ENV GOPATH /go
    ENV PATH $GOPATH/bin:/usr/local/go/bin:$PATH
    
    RUN go get github.com/go-delve/delve/cmd/dlv
    
    # set the working directory to /go/src
    WORKDIR $GOPATH/src
    
    # Copy everything from the current directory to the working directory inside the container
    # (as set by WORKDIR)
    COPY . .
    
    # 8080 is for the web application
    EXPOSE 8080 2345

• docker-compose.yml

    version: "3.0"
    
    services:
      web:
        container_name: go-delve-docker-vscode-example
        build: "./"
        ports:
          - "8080:8080"
          - "2345:2345"
        security_opt:
          - "seccomp:unconfined"
        tty: true
        stdin_open: true
        # command: go run main.go
        command: dlv debug --headless --listen=:2345 --api-version=2 --log main.go

• 启动.json

    {
        "version": "0.2.0",
        "configurations": [
              {
                    "name": "Delve into Docker",
                    "type": "go",
                    "request": "launch",
                    "mode": "remote",
                    "remotePath": "/go/src/",
                    "port": 2345,
                    "host": "127.0.0.1",
                    "program": "${workspaceRoot}",
                    "showLog": true
              }
        ]
    }

我可以看到我的应用程序的 docker 日志，我知道它正在监听2345. 但无论出于何种原因，我似乎无法调试该应用程序。我看到的另一个问题是，我看不到任何尝试运行launch.json.

编辑：我在 Mac OSX 上使用 Docker Desktop 运行它。

Answer 1

Mac 版 Docker 桌面在虚拟机内运行 docker。

您应该使用虚拟机 IP，而不是尝试访问 127.0.0.1:2345。