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docs: clarify --add-host example uses two terminals #6956

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7 changes: 7 additions & 0 deletions docs/reference/commandline/container_run.md
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Expand Up @@ -1290,10 +1290,17 @@ The following example shows how the special `host-gateway` value works. The
example runs an HTTP server that serves a file from host to container over the
`host.docker.internal` hostname, which resolves to the host's internal IP.

In one terminal, create the file and start an HTTP server:

```console
$ echo "hello from host!" > ./hello
$ python3 -m http.server 8000
Serving HTTP on 0.0.0.0 port 8000 (http://0.0.0.0:8000/) ...
```

In another terminal, run a container that connects to the HTTP server:

```console
$ docker run \
--add-host host.docker.internal=host-gateway \
curlimages/curl -s host.docker.internal:8000/hello
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