docs: add addn server guidance for Linux users in Quick Start (#972)

# What does this PR do?

- [x] Addresses issue #971


## Test Plan
Ran docs build locally

## Sources
See discussion linked in the issue

## Before submitting

- [x] This PR fixes a typo or improves the docs (you can dismiss the
other checks if that's the case).
- [ ] Ran pre-commit to handle lint / formatting issues.
- [ ] Read the [contributor
guideline](https://github.com/meta-llama/llama-stack/blob/main/CONTRIBUTING.md),
      Pull Request section?
- [ ] Updated relevant documentation.
- [ ] Wrote necessary unit or integration tests.

Signed-off-by: Nathan Weinberg <nweinber@redhat.com>
Co-authored-by: Mert Parker <mertpaker@gmail.com>

docs/source/getting_started/index.md

@@ -66,6 +66,23 @@ As another example, to start the container with Podman, you can do the same but
 
 Configuration for this is available at `distributions/ollama/run.yaml`.
 
+```{admonition} Note
+:class: note
+
+Docker containers run in their own isolated network namespaces on Linux. To allow the container to communicate with services running on the host via `localhost`, you need `--network=host`. This makes the container use the host’s network directly so it can connect to Ollama running on `localhost:11434`.
+
+Linux users having issues running the above command should instead try the following:
+```bash
+docker run -it \
+  -p $LLAMA_STACK_PORT:$LLAMA_STACK_PORT \
+  -v ~/.llama:/root/.llama \
+  --network=host \
+  llamastack/distribution-ollama \
+  --port $LLAMA_STACK_PORT \
+  --env INFERENCE_MODEL=$INFERENCE_MODEL \
+  --env OLLAMA_URL=http://localhost:11434
+```
+
 :::