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# FastAPI CLI
**FastAPI CLI** 是一个命令行程序,你可以用它来部署和运行你的 FastAPI 应用程序,管理你的 FastAPI 项目,等等。
当你安装 FastAPI 时(例如使用 `pip install FastAPI` 命令),会包含一个名为 `fastapi-cli` 的软件包,该软件包在终端中提供 `fastapi` 命令。
要在开发环境中运行你的 FastAPI 应用,你可以使用 `fastapi dev` 命令:
<div class="termy">
```console
$ <font color="#4E9A06">fastapi</font> dev <u style="text-decoration-style:solid">main.py</u>
<span style="background-color:#009485"><font color="#D3D7CF"> FastAPI </font></span> Starting development server 🚀
Searching for package file structure from directories with
<font color="#3465A4">__init__.py</font> files
Importing from <font color="#75507B">/home/user/code/</font><font color="#AD7FA8">awesomeapp</font>
<span style="background-color:#007166"><font color="#D3D7CF"> module </font></span> 🐍 main.py
<span style="background-color:#007166"><font color="#D3D7CF"> code </font></span> Importing the FastAPI app object from the module with the
following code:
<u style="text-decoration-style:solid">from </u><u style="text-decoration-style:solid"><b>main</b></u><u style="text-decoration-style:solid"> import </u><u style="text-decoration-style:solid"><b>app</b></u>
<span style="background-color:#007166"><font color="#D3D7CF"> app </font></span> Using import string: <font color="#3465A4">main:app</font>
<span style="background-color:#007166"><font color="#D3D7CF"> server </font></span> Server started at <font color="#729FCF"><u style="text-decoration-style:solid">http://127.0.0.1:8000</u></font>
<span style="background-color:#007166"><font color="#D3D7CF"> server </font></span> Documentation at <font color="#729FCF"><u style="text-decoration-style:solid">http://127.0.0.1:8000/docs</u></font>
<span style="background-color:#007166"><font color="#D3D7CF"> tip </font></span> Running in development mode, for production use:
<b>fastapi run</b>
Logs:
<span style="background-color:#007166"><font color="#D3D7CF"> INFO </font></span> Will watch for changes in these directories:
<b>[</b><font color="#4E9A06">&apos;/home/user/code/awesomeapp&apos;</font><b>]</b>
<span style="background-color:#007166"><font color="#D3D7CF"> INFO </font></span> Uvicorn running on <font color="#729FCF"><u style="text-decoration-style:solid">http://127.0.0.1:8000</u></font> <b>(</b>Press CTRL+C to
quit<b>)</b>
<span style="background-color:#007166"><font color="#D3D7CF"> INFO </font></span> Started reloader process <b>[</b><font color="#34E2E2"><b>383138</b></font><b>]</b> using WatchFiles
<span style="background-color:#007166"><font color="#D3D7CF"> INFO </font></span> Started server process <b>[</b><font color="#34E2E2"><b>383153</b></font><b>]</b>
<span style="background-color:#007166"><font color="#D3D7CF"> INFO </font></span> Waiting for application startup.
<span style="background-color:#007166"><font color="#D3D7CF"> INFO </font></span> Application startup complete.
```
</div>
该命令行程序 `fastapi` 就是 **FastAPI CLI**
FastAPI CLI 接收你的 Python 程序路径,自动检测包含 FastAPI 的变量(通常命名为 `app`)及其导入方式,然后启动服务。
在生产环境中,你应该使用 `fastapi run` 命令。🚀
在内部,**FastAPI CLI** 使用了 <a href="https://www.uvicorn.dev" class="external-link" target="_blank">Uvicorn</a>,这是一个高性能、适用于生产环境的 ASGI 服务器。😎
## `fastapi dev`
当你运行 `fastapi dev` 时,它将以开发模式运行。
默认情况下,它会启用**自动重载**,因此当你更改代码时,它会自动重新加载服务器。该功能是资源密集型的,且相较不启用时更不稳定,因此你应该仅在开发环境下使用它。
默认情况下,它将监听 IP 地址 `127.0.0.1`,这是你的机器与自身通信的 IP 地址(`localhost`)。
## `fastapi run`
当你运行 `fastapi run` 时,它默认以生产环境模式运行。
默认情况下,**自动重载是禁用的**。
它将监听 IP 地址 `0.0.0.0`,即所有可用的 IP 地址,这样任何能够与该机器通信的人都可以公开访问它。这通常是你在生产环境中运行它的方式,例如在容器中运行。
在大多数情况下,你会(且应该)有一个“终止代理”在上层为你处理 HTTPS,这取决于你如何部署应用程序,你的服务提供商可能会为你处理此事,或者你可能需要自己设置。
/// tip | 提示
你可以在 [deployment documentation](deployment/index.md){.internal-link target=_blank} 获得更多信息。
///