> For the complete documentation index, see [llms.txt](https://hezhiqiang.gitbook.io/docker/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hezhiqiang.gitbook.io/docker/appendix/debug.md).

# 附录五：如何调试 Docker

## 开启 Debug 模式

在 dockerd 配置文件 daemon.json（默认位于 /etc/docker/）中添加

```javascript
{
  "debug": true
}
```

重启守护进程。

```bash
$ sudo kill -SIGHUP $(pidof dockerd)
```

此时 dockerd 会在日志中输入更多信息供分析。

## 检查内核日志

```bash
$ sudo dmesag |grep dockerd
$ sudo dmesag |grep runc
```

## Docker 不响应时处理

可以杀死 dockerd 进程查看其堆栈调用情况。

```bash
$ sudo kill -SIGUSR1 $(pidof dockerd)
```

## 重置 Docker 本地数据

*注意，本操作会移除所有的 Docker 本地数据，包括镜像和容器等。*

```bash
$ sudo rm -rf /var/lib/docker
```


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://hezhiqiang.gitbook.io/docker/appendix/debug.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.