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Update 0.FAQ.md #2407

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Expand Up @@ -381,6 +381,36 @@ NebulaGraph {{ nebula.release }} 未提供运维命令以实现自动扩缩容

`OFFLINE` 状态的 Host 将在一天后自动删除。

### 如何查看 dmp 文件？

dmp 文件是错误报告文件，详细记录了进程退出的信息，可以用操作系统自带的 gdb 工具查看。Coredump 文件默认保存在启动二进制的当前目录下（默认为`/usr/local/nebula`目录），在 NebulaGraph 服务 crash 时，系统会自动生成。

1. 查看 Core 文件进程名字，pid 一般为数值。
```
$ file core.<pid>
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```
2. 使用 gdb 调试。
```
$ gdb <process.name> core.<pid>
```
3. 查看文件内容。
```
$(gdb) bt
```
例如：

```bash
$ file core.624
core.624: ELF 64-bit LSB core file x86-64, version 1 (SYSV), SVR4-style, from '/usr/local/nebula', real uid: 0, effective uid: 0, real gid: 0, effective gid: 0, execfn: '/usr/local/nebula', platform: 'x86_64'
$ gdb /usr/local/nebula core.624
$(gdb) bt
...
warning: File "/usr/lib64/libthread_db-1.0.so" auto-loading has been declined by your `auto-load safe-path' set to "$debugdir:$datadir/auto-load:/usr/share/gdb/auto-load".
...
```

如果用户不清楚 dmp 打印出来的相关信息，可以将打印出来的内容，带上操作系统版本、硬件配置、Core文件产生前后的错误日志和可能导致错误的操作贴在 [NebulaGraph 论坛](https://discuss.nebula-graph.com.cn/)上寻求帮助。

## 关于连接

### 防火墙中需要开放哪些端口？
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