mdBook/book-example/src/cli/serve.md

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# The serve command
The `serve` command is useful when you want to preview your book. It also does hot reloading of the webpage whenever a file changes.
It achieves this by serving the books content over `localhost:3000` (unless otherwise configured, see below) and runs a websocket server on `localhost:3001` which triggers the reloads.
This preferred by many for writing books with mdbook because it allows for you to see the result of your work instantly after every file change.
#### Specify a directory
Like `watch`, `serve` can take a directory as argument to use instead of the
current working directory.
```bash
mdbook serve path/to/book
```
#### Server options
`serve` has four options: the http port, the websocket port, the interface to serve on, and the public address of the server so that the browser may reach the websocket server.
For example: suppose you had an nginx server for SSL termination which has a public address of 192.168.1.100 on port 80 and proxied that to 127.0.0.1 on port 8000. To run use the nginx proxy do:
```bash
mdbook server path/to/book -p 8000 -i 127.0.0.1 -a 192.168.1.100
```
If you were to want live reloading for this you would need to proxy the websocket calls through nginx as well from `192.168.1.100:<WS_PORT>` to `127.0.0.1:<WS_PORT>`. The `-w` flag allows for the websocket port to be configured.
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#### --open
When you use the `--open` (`-o`) option, mdbook will open the book in your
your default web browser after starting the server.
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#### --dest-dir
The `--dest-dir` (`-d`) option allows you to change the output directory for your book.
-----
***note:*** *the `serve` command has not gotten a lot of testing yet, there could be some rough edges. If you discover a problem, please report it [on Github](https://github.com/azerupi/mdBook/issues)*