Open WebUI, vLLM, Ollama: Secure AI Inference Sandbox & GPU Optimized

Deploy a production-ready, security-hardened Private AI Sandbox on Amazon EC2 GPU instances. Built on Ubuntu 22.04 LTS with a CIS-oriented baseline, this AMI eliminates hours of manual work configuring NVIDIA drivers, CUDA 12.4, Docker, NVIDIA Container Toolkit, Nginx, and Open WebUI.

WHAT YOU GET

CoreNova Enterprise Secure AI Sandbox ships with a decoupled, secure three-layer architecture:

• 1. Open WebUI (Default User Interface) Browser-based chat, RAG, and administrative controls. Served securely over HTTPS on port 443 via Nginx. (Note: Due to the private environment setup, a self-signed TLS certificate is used on first boot. It is perfectly safe to bypass the browser's privacy warning to proceed; you can replace this with your own public SSL certificate for production).
• 2. Ollama (DEFAULT Inference Engine) GPU-accelerated GGUF model serving. This acts as your default out-of-the-box engine for chat. It follows a strict Bring Your Own Model (BYOM) approach, allowing you to pull any open-source or custom models directly via the WebUI or CLI without any pre-bloated weights. Ollama listens on localhost only and is never exposed to the public internet.
• 3. vLLM (OPTIONAL Second Engine) A high-throughput, OpenAI-compatible API listening on localhost port 8000. It is NOT started by default. Enable it manually when you need to deploy HuggingFace transformers or require higher serving throughput. Multi-GPU instances will auto-configure the tensor parallel size.

FIRST BOOT (Typical 5 to 10 minutes on g4dn.xlarge)

After launching the instance, please allow 5 to 10 minutes for initialization before attempting to log in. The instance will automatically:

• Configure the Docker NVIDIA container runtime.
• Initialize the private inference engine environment.
• Seed the secure administrator account and start Open WebUI behind the Nginx reverse proxy.

Access URL: https://YOUR_PUBLIC_IP/ (Direct HTTPS access, no port 3000 exposure)

First Login Credentials (Public signup is strictly disabled):

• Email: <admin@local.host>
• Password: Your unique EC2 Instance ID (e.g., i-0abcdef123456789f)

> CRITICAL SECURITY NOTE: Please change your administrator password immediately after your first successful login.

STORAGE (Recommended Expansion)

To accommodate large LLM weights, attach an additional gp3 EBS volume (100 GB or larger) during launch. On the first boot, our background script will automatically detect, partition, and mount any blank/unformatted secondary volume to /mnt/models. (Note: To protect your data assets, existing formatted volumes containing data will not be modified or overwritten. Ollama models will persist under /mnt/models/ollama).

SECURITY AND PRIVACY

• Network Isolation: HTTPS 443 for WebUI access; Ollama and vLLM are bound strictly to localhost to narrow the attack surface.
• Access Control: Admin seeded securely from your EC2 Instance ID; ENABLE_SIGNUP=false prevents rogue registrations.
• OS-Level Hardening: Pre-configured with UFW firewall, fail2ban, auditd, and unattended security upgrades.
• 100% Data Privacy: 100% on-instance inference. Your prompts, embeddings, and uploaded documents stay strictly within your own VPC.
• Audit Readiness: Includes a pre-configured CloudWatch Agent configuration template for Nginx audit logs (requires attaching an appropriate IAM role to the EC2 instance).

REQUIREMENTS

• Amazon EC2 GPU Instance: Compatible with g4dn, g5, g6, p3, p4d, or p5 families.
• Security Group Rules: Inbound TCP 443 for WebUI users, TCP 22 for administrative SSH.
• EC2 Key Pair: Required for SSH access (password-based SSH login is strictly disabled).

OPTIONAL vLLM SWITCHING & VRAM SAFETY

On single-GPU instances, running Ollama and vLLM simultaneously will cause a VRAM Out-of-Memory (OOM) crash. To safely switch from the default Ollama engine to the high-throughput vLLM engine, you MUST stop Ollama first to free up GPU memory:

To safely switch to vLLM:

sudo systemctl stop ollama

sudo systemctl start corenova-ai-vllm

To safely switch back to Ollama:

sudo systemctl stop corenova-ai-vllm

sudo systemctl start ollama

Part of the CoreNova Hardened AMI series. Technical Support & Inquiries: support@corenovacloud.com