# On your local machine, if you don't have an SSH key
ssh-keygen -t ed25519 -C "[email protected]"
# Press enter for defaults, no passphrase needed

# Add the public key to DigitalOcean during droplet creation
# Or paste it in Settings → Security → SSH Keys

# SSH into your droplet (DigitalOcean sends the IP via email)
ssh root@YOUR_DROPLET_IP

# First login, update everything
apt update && apt upgrade -y

# Download and install
curl https://ollama.ai/install.sh | sh

# Verify installation
ollama --version
# Output: ollama version is 0.1.XX

# Ollama runs as a background service
systemctl start ollama
systemctl enable ollama  # Start on reboot

# Verify it's running
systemctl status ollama

# This downloads Llama 2 7B quantized to Q4_0 (~3.8GB)
# First run takes 5-10 minutes depending on your internet
ollama pull llama2:7b-chat-q4_0

# Watch it download
# Output:
# pulling manifest
# pulling 8934d3bdaf31... 100% |████████████████| (3.8 GB/3.8 GB)
# pulling 8c2ff77343c1... 100% |████████████████| (29 KB/29 KB)
# pulling 7c23fb36d801... 100% |████████████████| (142 B/142 B)
# removing any unused layers
# success

# Run a test inference
ollama run llama2:7b-chat-q4_0 "What is the capital of France?"

# You should get:
# The capital of France is Paris.
# 
# (Response time: 2-8 seconds depending on droplet specs)

# Stop the current Ollama service
systemctl stop ollama

# Start with network binding
OLLAMA_HOST=0.0.0.0:11434 ollama serve &

# Verify it's listening
netstat -tuln | grep 11434
# tcp        0      0 0.0.0.0:11434           0.0.0.0:*               LISTEN

# Install Caddy
apt install -y caddy

# Create a Caddyfile
cat > /etc/caddy/Caddyfile << 'EOF'
api.yourdomain.com {
    reverse_proxy localhost:11434
    basicauth / {
        apiuser $2a$14$abcdefghijklmnopqrstuvwxyz...
    }
}
EOF

# Generate a bcrypt password hash
caddy hash-password --plaintext "your_secure_password"
# Copy the output and paste it into Caddyfile

# Start Caddy
systemctl start caddy
systemctl enable caddy

# From your local machine
ssh -L 11434:localhost:11434 root@YOUR_DROPLET_IP

# Now hit localhost:11434 from your local app
# All traffic is encrypted through SSH

// inference-client.js
const http = require('http');

const OLLAMA_HOST = 'localhost';
const OLLAMA_PORT = 11434;
const MODEL = 'llama2:7b-chat-q4_0';

async function generateResponse(prompt, systemPrompt = '') {
  return new Promise((resolve, reject) => {
    const payload = JSON.stringify({
      model: MODEL,
      prompt: prompt,
      system: systemPrompt,
      stream: false,
      temperature: 0.7,
      top_p: 0.9,
    });

    const options = {
      hostname: OLLAMA_HOST,
      port: OLLAMA_PORT,
      path: '/api/generate',
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Content-Length': Buffer.byteLength(payload),
      },
    };

    const req = http.request(options, (res) => {
      let data = '';
      res.on('data', (chunk) => {
        data += chunk;
      });
      res.on('end', () => {
        try {
          const parsed = JSON.parse(data);
          resolve({
            response: parsed.response,
            tokens_used: parsed.eval_count,
            time_ms: parsed.total_duration / 1000000, // Convert to ms
          });
        } catch (e) {
          reject(e);
        }
      });
    });

    req.on('error', reject);
    req.write(payload);
    req.end();
  });
}

// Example usage
(async () => {
  try {
    const result = await generateResponse(
      'Summarize the benefits of self-hosting LLMs in 2 sentences.',
      'You are a helpful AI assistant.'
    );
    console.log('Response:', result.response);
    console.log(`Generated in ${result.time_ms}ms using ${result.tokens_used} tokens`);
  } catch (error) {
    console.error('Error:', error);
  }
})();

# First, set up SSH tunnel on your local machine
ssh -L 11434:localhost:11434 root@YOUR_DROPLET_IP &

# Then run the client
node inference-client.js

# Output:
# Response: Self-hosting LLMs eliminates vendor lock-in and per-token costs while maintaining privacy. It enables unlimited API calls and custom fine-tuning at a fraction of the cost of commercial alternatives.
# Generated in 2847ms using 64 tokens

# inference_client.py
import requests
import time
import json

OLLAMA_URL = 'http://localhost:11434'
MODEL = 'llama2:7b-chat-q4_0'

def generate_response(prompt, system_prompt=''):
    payload = {
        'model': MODEL,
        'prompt': prompt,
        'system': system_prompt,
        'stream': False,
        'temperature': 0.7,
        'top_p': 0.9,
    }

    start = time.time()
    response = requests.post(f'{OLLAMA_URL}/api/generate', json=payload)
    elapsed = time.time() - start

    data = response.json()
    return {
        'response': data['response'],
        'tokens': data.get('eval_count', 0),
        'time_ms': elapsed * 1000,
    }

# Usage
result = generate_response(
    'What are three ways to optimize LLM inference on limited hardware?',
    'You are a helpful AI assistant.'
)
print(f"Response: {result['response']}")
print(f"Generated in {result['time_ms']:.0f}ms using {result['tokens']} tokens")

# Create a systemd service for Ollama
cat > /etc/systemd/system/ollama.service << 'EOF'
[Unit]
Description=Ollama Service
After=network.target

[Service]
Type=simple
User=ollama
ExecStart=/usr/local/bin/ollama serve
Restart=always
RestartSec=10
Environment="OLLAMA_HOST=127.0.0.1:11434"

[Install]
WantedBy=multi-user.target
EOF

# Create ollama user
useradd -m -s /bin/bash ollama

# Set permissions
chown -R ollama:ollama /home/ollama

# Enable and start
systemctl daemon-reload
systemctl enable ollama
systemctl start ollama

# Check memory and CPU
watch -n 1 'free -h && echo "---" && top -bn1 | head -20'

# Expected output on 2GB droplet during inference:
# Mem: 2.0Gi total, 1.2Gi used, 800Mi free
# CPU: ~50-80% during inference, <5% idle

# Ollama logs to journald automatically
# View logs
journalctl -u ollama -f

# Check for errors
journalctl -u ollama --no-pager | tail -50

bash
# Add swap (critical for 1GB droplets)
fallocate -l 2G /swapfile
chmod 600 /swapfile
mkswap /swapfile
swapon /swapfile

# Make permanent
echo '/swapfile none swap sw 0 

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