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docs: run host HTTP server in background for --add-host example #7172

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9 changes: 7 additions & 2 deletions docs/reference/commandline/container_run.md
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Expand Up @@ -1292,14 +1292,19 @@ example runs an HTTP server that serves a file from host to container over the

```console
$ echo "hello from host!" > ./hello
$ python3 -m http.server 8000
$ python3 -m http.server 8000 &
[1] 401234
Serving HTTP on 0.0.0.0 port 8000 (http://0.0.0.0:8000/) ...
$ docker run \
$ docker run --rm \
--add-host host.docker.internal=host-gateway \
curlimages/curl -s host.docker.internal:8000/hello
hello from host!
$ kill %1
```

The HTTP server must keep running while you start the container. Run it in the
background (as above) or in a second terminal, then stop it when you are done.

The `--add-host` flag also accepts a `:` separator, for example:

```console
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