HO与DLV和MODD在Docker上进行调试

Question

我正在 Docker 上运行 Go 应用程序，并希望使用 VSCode 通过 DLV 对其进行调试同时使用 MODD 进行应用程序重建。到目前为止我不知道如何连接到调试器。

Docker:

FROM golang:1.18 as dev
WORKDIR /root
RUN GO111MODULE=on go install github.com/cortesi/modd/cmd/modd@latest
RUN go install github.com/go-delve/delve/cmd/dlv@latest
COPY . .
CMD modd

MODD:

**/*.go !**/*_test.go {
    prep: go build -o app main.go
    prep: dlv exec --headless --continue --listen localhost:2345 --accept-multiclient ./app
    daemon +sigterm: ./app
}

DOCKER_COMPOSE (暴露端口):

ports:
      - "5000:5000"
      - "2345:2345"

VSCode 配置:

{
        "name": "Connect to Go server",
        "type": "go",
        "request": "attach",
        "mode": "remote",
        "remotePath": "${workspaceFolder}",
        "port": 2345,
        "host": "127.0.0.1",
    }

问：如何使用 MODD 让 DLV 在 Docker 上工作？

谢谢！

Answer 1

好吧，据我所知，做你想做的事情并不简单，因为你必须观察主机中文件的更改才能触发容器内的 dlv，从而扰乱 vscode 正在进行的调试会话。

这是设置 vscode 来调试容器中的应用程序并使用 modd 在文件更改时在容器内重新启动调试的hacky方法。

（确保您的主机中安装了 modd）

.vscode/launch.json

 {
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Debug",
            "type": "go",
            "request": "attach",
            "mode": "remote",
            "remotePath": "/root",
            "port": 2345,
            "host": "127.0.0.1",
            "trace": "verbose",
            "preLaunchTask": "setup docker debug",
            "postDebugTask": "teardown docker debug"
        }
    ]
 }

.vscode/tasks.json - 此文件将指示 vscode 通过以下方式运行容器docker compose 并在后台运行 modd

{
    "version": "2.0.0",
    "tasks": [
        {
            "label": "setup docker debug",
            "dependsOn": [               
                "show app console"                
            ]
        },
        {
            "label": "teardown docker debug",
            "dependsOrder": "sequence",
            "dependsOn": [
                "stop all containers"
            ]
        },
        {
            "label": "show app console",
            "command": "docker logs app --follow",
            "type": "shell",
            "isBackground": true,
            "presentation": {
                "reveal": "always",
                "panel": "dedicated",
                "clear": true,
                "showReuseMessage": true
            },
            "problemMatcher": [
                {
                    "pattern": [
                        {
                            "regexp": ".",
                            "file": 1,
                            "location": 2,
                            "message": 3
                        }
                    ],
                    "background": {
                        "activeOnStart": true,
                        "beginsPattern": ".",
                        "endsPattern": ".",
                    }
                }
            ],
            "dependsOn":[
                "start all containers",
                "modd"
            ]
        },
        {
            "label": "start all containers",
            "type": "shell",
            "command": "docker-compose up --build --force-recreate --detach",
            "presentation": {
                "reveal": "always",
                "panel": "shared",
                "clear": true,
                "showReuseMessage": true
            },
            "dependsOn":[
                "stop all containers"
            ]
        },
        {
            "label": "stop all containers",
            "type": "shell",
            "command": "docker-compose down",
            "presentation": {
                "panel": "shared",
                "clear": true
            },
        },
        {
            "label": "modd",
            "type": "shell",
            "isBackground": true,
            "command": "modd",
            "presentation": {
                "panel": "new", 
                "clear": true
            },
            "problemMatcher": [
                {
                    "pattern": [
                        {
                            "regexp": ".",
                            "file": 1,
                            "location": 2,
                            "message": 3
                        }
                    ],
                    "background": {
                        "activeOnStart": true,
                        "beginsPattern": ".",
                        "endsPattern": ".",
                    }
                }
            ],
        }
    ]
}

docker-compose.yml

version: "3.8"
services:
  app:
    container_name: app
    build:
      context: .
    restart: on-failure
    ports:
      - 5000:5000
      - 2345:2345
    security_opt:
      - apparmor=unconfined
    cap_add:
      - SYS_PTRACE

Dockerfile

FROM golang
WORKDIR /root
RUN go install github.com/go-delve/delve/cmd/dlv@latest
COPY . .
ENTRYPOINT dlv --listen=:2345 --api-version=2 --headless --accept-multiclient debug .

dlv.txt - 此文件将用于调用 dlv 来重建并继续

rebuild
continue

modd.conf - modd 会将所有文件复制回容器并发出重建并继续命令到正在运行的 dlv

**/*.go !**/*_test.go {
    prep +onchange: docker cp ./ app:/root/
    prep +onchange: timeout 1 dlv connect localhost:2345 --init dlv.txt
}

您将能够设置断点和所有内容，但您会注意到有时您需要手动暂停并继续恢复调试会话。