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

# Linux Security Hardening

> TractorOS security controls and Linux hardening practices

# Linux & OS Security (TractorOS)

FarmGPU's operating system, **TractorOS**, is built on established Linux security best practices and extended with targeted hardening techniques designed for AI infrastructure. The goal is to **reduce attack surface, enforce consistency, and limit blast radius**, while preserving performance for GPU- and storage-intensive workloads.

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## Secure OS Baseline & Attack Surface Reduction

TractorOS follows a **minimal, hardened Linux baseline** designed to reduce unnecessary exposure.

Key practices include:

* Minimal OS footprint with only required services enabled
* Removal of unused packages, daemons, and subsystems
* No interactive user accounts on production nodes
* Controlled administrative access via centralized tooling only

These practices reduce the number of reachable services and limit opportunities for lateral movement or privilege escalation.

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## Kernel & Runtime Hardening

The Linux kernel and runtime configuration are hardened using widely adopted security controls.

Key measures:

* Conservative kernel configuration aligned with security best practices
* Signed kernel modules and restricted module loading
* Hardened sysctl settings (memory protection, process isolation, ptrace restrictions)
* Enforced memory protections (ASLR, NX, KPTI where applicable)

Security settings are evaluated alongside performance requirements to avoid negatively impacting GPU or storage throughput.

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## Storage & Device Security

TractorOS treats storage and hardware devices as **security-sensitive resources**, not just performance components.

Controls include:

* Enforced device isolation for GPUs, NVMe, and NICs
* No direct access to raw block devices by tenant workloads
* Hardware-backed encryption at rest (SEDs) enabled by default
* Secure device lifecycle handling, including cryptographic erase before reuse

These measures help ensure that data remains protected even in multi-tenant and hardware-reuse scenarios.

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## TractorOS-Specific Hardening Techniques

In addition to standard Linux practices, TractorOS incorporates several platform-specific controls:

* **Immutable OS images:**

  The base OS is read-only and updated atomically, preventing configuration drift and persistent compromise.

* **Deterministic provisioning:**

  Nodes are provisioned from known-good images with repeatable configuration.

* **Explicit trust boundaries:**

  Clear separation between the host OS, management services, and customer workloads.

* **Observable state:**

  OS state and system events are continuously monitored and logged for audit and incident response.

These techniques enable FarmGPU to maintain **consistent security posture across fleets**, while supporting rapid recovery and rollback if issues arise.