提问人：Michael Odumosu 提问时间：6/14/2023 最后编辑：Michael Odumosu 更新时间：6/14/2023 访问量：310
DLV 调试问题转到在 docker 容器中运行的应用程序
DLV debug issue to go application running in docker container
问：
我目前面临与将根令牌 ID 设置为 HashiCorp Vault Go 代码中的先前值相关的问题。我尝试在 Docker 容器中使用 dlv debug 调试应用程序。但是，当尝试在我的 Windows 计算机上运行应用程序时，它挂起。尽管应用程序最终在 Docker 计算机上运行，但我在设置断点时遇到了调试器无法正常运行的问题。
问题是，当应用程序在 docker 容器中运行时，我如何让 delve 调试器在断点处正确停止
为了更好地理解这个问题，我在 GitHub 上附上了该问题的最小复制。
我试过什么
- 尝试在 Windows 本地上运行应用程序，但它挂起
- 试图确保 Go 版本匹配仍然没有运气
答：
0赞
Zeke Lu
6/14/2023
#1
如果你仔细查看日志，你会看到这样的内容：
2023-06-14T00:58:37Z debug layer=rpc <- RPCServer.CreateBreakpoint(rpc2.CreateBreakpointIn{"Breakpoint":{"id":0,"name":"","addr":0,"addrs":null,"addrpid":null,"file":"/usr/src/app/minimal_repro/main.go","line":15,"Cond":"","HitCond":"","HitCondPerG":false,"continue":false,"traceReturn":false,"goroutine":false,"stacktrace":0,"LoadArgs":{"FollowPointers":true,"MaxVariableRecurse":1,"MaxStringLen":64,"MaxArrayValues":64,"MaxStructFields":-1},"LoadLocals":{"FollowPointers":true,"MaxVariableRecurse":1,"MaxStringLen":64,"MaxArrayValues":64,"MaxStructFields":-1},"WatchExpr":"","WatchType":0,"hitCount":null,"totalHitCount":0,"disabled":false},"LocExpr":"","SubstitutePathRules":null,"Suspended":false})
2023-06-14T00:58:37Z debug layer=rpc -> *rpc2.CreateBreakpointOut{"Breakpoint":{"id":0,"name":"","addr":0,"addrs":null,"addrpid":null,"file":"","line":0,"Cond":"","HitCond":"","HitCondPerG":false,"continue":false,"traceReturn":false,"goroutine":false,"stacktrace":0,"LoadArgs":null,"LoadLocals":null,"WatchExpr":"","WatchType":0,"hitCount":null,"totalHitCount":0,"disabled":false}} error: "could not find file /usr/src/app/minimal_repro/main.go"
它无法在文件上设置断点 。正确的文件位置是 。/usr/src/app/minimal_repro/main.go/usr/src/app/main.go
这是您的文件：.vscode/launch.json
{
"version": "0.2.0",
"configurations": [
{
"name": "Connect to server",
"type": "go",
"request": "attach",
"mode": "remote",
"remotePath": "/usr/src/app/",
"port": 2345,
"host": "127.0.0.1",
"cwd": "${workspaceFolder}",
"trace": "verbose"
}
]
}
这是目录结构：
├── minimal_repro
│ ├── Dockerfile
│ ├── go.mod
│ └── main.go
└── .vscode
├── launch.json
└── tasks.json
替换为将解决该问题。"cwd": "${workspaceFolder}""cwd": "${workspaceFolder}/minimal_repro"
根据 vscode-go 调试，已弃用。请改用。使用 ，如下所示：remotePathsubstitutePathsubstitutePath.vscode/launch.json
{
"version": "0.2.0",
"configurations": [
{
"name": "Connect to server",
"type": "go",
"request": "attach",
"mode": "remote",
"port": 2345,
"host": "127.0.0.1",
"substitutePath": [
{
"from": "${workspaceFolder}/minimal_repro",
"to": "/usr/src/app"
}
],
"trace": "verbose"
}
]
}
关于此代码：
fmt.Println("dont print the next line")
log.Print("dont print the next line")
fmt.Println("starting web server")
log.Print("starting web server")
生成以下输出：
dont print the next line
starting web server
2023/06/14 01:20:31 dont print the next line
2023/06/14 01:20:31 starting web server
这很可能是由于写入缓存造成的。这个问题应该在其他地方讨论。我没有手动讨论的链接，由于它对这个问题的主要问题并不重要，所以我暂时忽略它。
这是你的：Dockerfile
FROM golang:1.20.5-buster
WORKDIR /usr/src/app
COPY go.mod go.* ./
RUN go mod download && go mod verify
RUN go install github.com/go-delve/delve/cmd/dlv@latest
COPY . .
RUN go build -gcflags="all=-N -l" -v -o /usr/local/bin/app ./...
EXPOSE 2345
EXPOSE 5001
CMD ["dlv","debug","--listen=:2345","--headless=true","--api-version=2","--accept-multiclient","--log","--log-output=rpc,dap"]
# CMD ["dlv","debug","--api-version=2"]
# ENTRYPOINT ["bash"]
请注意，编译并开始调试当前目录中的主包。它不执行由 生成的那个。如果要调试预编译的可执行文件，请改用。dlv debugRUN go build -gcflags="all=-N -l" -v -o /usr/local/bin/app ./...dlv exec
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