> ## Documentation Index
> Fetch the complete documentation index at: https://docs.warpscale.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# What to install

> The four Warpscale components, what each one is for, and the requirements they share.

## Choose what you need

The probe runs on every GPU node and is required for everything else: the CLI and the vLLM plugin report through it, and the Python SDK reports through the CLI. What you add alongside the probe depends on your workload.

| Component       | Install                                         | When you need it                                                                |
| --------------- | ----------------------------------------------- | ------------------------------------------------------------------------------- |
| **Probe**       | [Install the probe](/install/probe)             | **Always.** One per GPU node.                                                   |
| **CLI**         | [Install the CLI](/install/cli)                 | Training runs.                                                                  |
| **Python SDK**  | [Install the Python SDK](/install/python-sdk)   | Training runs. Adds step, epoch, and checkpoint progress from inside your code. |
| **vLLM plugin** | [Install the vLLM plugin](/install/vllm-plugin) | Inference on vLLM.                                                              |

## Requirements

These apply to every component and every deployment mode. Each install page lists what it needs on top of these.

**Platform**

* **Linux only.**
* Architecture `amd64` or `arm64`.
* **glibc 2.31 or newer** — Ubuntu 20.04+, Debian 11+, RHEL 9+.
* **cgroup v2**, and a kernel with eBPF and BTF enabled.
* An **NVIDIA driver** installed and reachable by the probe, for GPU metrics.

**Account**

* Your **organization URL**
* An **organization API key**

Both are set up when your organization is created. See the [Quickstart](/quickstart).