# Requisiti Tecnici per LLM - Generazione Documentazione Datacenter

## 1. Capacità Richieste al LLM

### 1.1 Capabilities Fondamentali
- **Network Access**: Connessioni SSH, HTTPS, SNMP
- **API Interaction**: REST, SOAP, GraphQL
- **Code Execution**: Python, Bash, PowerShell
- **File Operations**: Lettura/scrittura file markdown
- **Database Access**: MySQL, PostgreSQL, SQL Server

### 1.2 Librerie Python Richieste
```python
# Networking e protocolli
pip install paramiko          # SSH connections
pip install pysnmp            # SNMP queries
pip install requests          # HTTP/REST APIs
pip install netmiko           # Network device automation

# Virtualizzazione
pip install pyvmomi           # VMware vSphere API
pip install proxmoxer         # Proxmox API
pip install libvirt-python    # KVM/QEMU

# Storage
pip install pure-storage      # Pure Storage API
pip install netapp-ontap      # NetApp API

# Database
pip install mysql-connector-python
pip install psycopg2          # PostgreSQL
pip install pymssql           # Microsoft SQL Server

# Monitoring
pip install zabbix-api        # Zabbix
pip install prometheus-client # Prometheus

# Cloud providers
pip install boto3             # AWS
pip install azure-mgmt        # Azure
pip install google-cloud      # GCP

# Utilities
pip install jinja2            # Template rendering
pip install pyyaml            # YAML parsing
pip install pandas            # Data analysis
pip install markdown          # Markdown generation
```

### 1.3 CLI Tools Required
```bash
# Network tools
apt-get install snmp snmp-mibs-downloader
apt-get install nmap
apt-get install netcat-openbsd

# Virtualization
apt-get install open-vm-tools  # VMware

# Monitoring
apt-get install nagios-plugins

# Storage
apt-get install nfs-common
apt-get install cifs-utils
apt-get install multipath-tools

# Database clients
apt-get install mysql-client
apt-get install postgresql-client
```

---

## 2. Accessi e Credenziali Necessarie

### 2.1 Formato Credenziali
Le credenziali devono essere fornite in un file sicuro (vault/encrypted):

```yaml
# credentials.yaml (encrypted)
datacenter:
  
  # Network devices
  network:
    cisco_switches:
      username: admin
      password: ${ENCRYPTED}
      enable_password: ${ENCRYPTED}
    firewalls:
      api_key: ${ENCRYPTED}
      
  # Virtualization
  vmware:
    vcenter_host: vcenter.domain.local
    username: automation@vsphere.local
    password: ${ENCRYPTED}
    
  proxmox:
    host: proxmox.domain.local
    token_name: automation
    token_value: ${ENCRYPTED}
    
  # Storage
  storage_arrays:
    - name: SAN-01
      type: pure_storage
      api_token: ${ENCRYPTED}
      
  # Databases
  databases:
    asset_management:
      host: db.domain.local
      port: 3306
      username: readonly_user
      password: ${ENCRYPTED}
      database: asset_db
      
  # Monitoring
  monitoring:
    zabbix:
      url: https://zabbix.domain.local
      api_token: ${ENCRYPTED}
      
  # Backup
  backup:
    veeam:
      server: veeam.domain.local
      username: automation
      password: ${ENCRYPTED}
```

### 2.2 Permessi Minimi Richiesti
**IMPORTANTE**: Utilizzare SEMPRE account a permessi minimi (read-only dove possibile)

| Sistema | Account Type | Permessi Richiesti |
|---------|-------------|-------------------|
| Network Devices | Read-only | show commands, SNMP read |
| VMware vCenter | Read-only | Global > Read-only role |
| Storage Arrays | Read-only | Monitoring/reporting access |
| Databases | SELECT only | Read access su schema asset |
| Monitoring | Read-only | View dashboards, metrics |
| Backup Software | Read-only | View jobs, reports |

---

## 3. Connettività di Rete

### 3.1 Requisiti Rete
```
LLM Host deve poter raggiungere:

Management Network:
- VLAN 10: 10.0.10.0/24 (Infrastructure Management)
- VLAN 20: 10.0.20.0/24 (Server Management)
- VLAN 30: 10.0.30.0/24 (Storage Management)

Porte richieste:
- TCP 22   (SSH)
- TCP 443  (HTTPS)
- TCP 3306 (MySQL)
- TCP 5432 (PostgreSQL)
- TCP 1433 (MS SQL Server)
- UDP 161  (SNMP)
- TCP 8006 (Proxmox)
```

### 3.2 Firewall Rules
```
# Allow LLM host to management networks
Source: [LLM_HOST_IP]
Destination: Management Networks
Protocol: SSH, HTTPS, SNMP, Database ports
Action: ALLOW

# Deny all other traffic from LLM host
Source: [LLM_HOST_IP]
Destination: Production Networks
Action: DENY
```

---

## 4. Rate Limiting e Best Practices

### 4.1 API Call Limits
```python
# Rispettare rate limits dei vendor
RATE_LIMITS = {
    'vmware_vcenter': {'calls_per_minute': 100},
    'network_devices': {'calls_per_minute': 10},
    'storage_api': {'calls_per_minute': 60},
    'monitoring_api': {'calls_per_minute': 300}
}

# Implementare retry logic con exponential backoff
import time
from functools import wraps

def retry_with_backoff(max_retries=3, base_delay=1):
    def decorator(func):
        @wraps(func)
        def wrapper(*args, **kwargs):
            for attempt in range(max_retries):
                try:
                    return func(*args, **kwargs)
                except Exception as e:
                    if attempt == max_retries - 1:
                        raise
                    delay = base_delay * (2 ** attempt)
                    time.sleep(delay)
        return wrapper
    return decorator
```

### 4.2 Concurrent Operations
```python
# Limitare operazioni concorrenti
from concurrent.futures import ThreadPoolExecutor

MAX_WORKERS = 5  # Non saturare le risorse

with ThreadPoolExecutor(max_workers=MAX_WORKERS) as executor:
    futures = [executor.submit(query_device, device) for device in devices]
    results = [f.result() for f in futures]
```

---

## 5. Error Handling e Logging

### 5.1 Logging Configuration
```python
import logging

logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
    handlers=[
        logging.FileHandler('/var/log/datacenter-docs/generation.log'),
        logging.StreamHandler()
    ]
)

logger = logging.getLogger('datacenter-docs')
```

### 5.2 Error Handling Strategy
```python
class DataCollectionError(Exception):
    """Custom exception per errori di raccolta dati"""
    pass

try:
    data = collect_vmware_data()
except ConnectionError as e:
    logger.error(f"Cannot connect to vCenter: {e}")
    # Utilizzare dati cached se disponibili
    data = load_cached_data('vmware')
except AuthenticationError as e:
    logger.critical(f"Authentication failed: {e}")
    # Inviare alert al team
    send_alert("VMware auth failed")
except Exception as e:
    logger.exception(f"Unexpected error: {e}")
    # Continuare con dati parziali
    data = get_partial_data()
```

---

## 6. Caching e Performance

### 6.1 Cache Strategy
```python
import redis
from datetime import timedelta

# Setup Redis per caching
cache = redis.Redis(host='localhost', port=6379, db=0)

def get_cached_or_fetch(key, fetch_function, ttl=3600):
    """Get from cache or fetch if not available"""
    cached = cache.get(key)
    if cached:
        logger.info(f"Cache hit for {key}")
        return json.loads(cached)
    
    logger.info(f"Cache miss for {key}, fetching...")
    data = fetch_function()
    cache.setex(key, ttl, json.dumps(data))
    return data

# Esempio uso
vmware_inventory = get_cached_or_fetch(
    'vmware_inventory',
    lambda: collect_vmware_inventory(),
    ttl=3600  # 1 hour
)
```

### 6.2 Dati da Cachare
- **1 ora**: Performance metrics, status real-time
- **6 ore**: Inventory, configurazioni
- **24 ore**: Asset database, ownership info
- **7 giorni**: Historical trends, capacity planning

---

## 7. Schedule di Esecuzione

### 7.1 Cron Schedule Raccomandato
```cron
# Aggiornamento documentazione completa - ogni 6 ore
0 */6 * * * /usr/local/bin/generate-datacenter-docs.sh --full

# Quick update (solo metrics) - ogni ora
0 * * * * /usr/local/bin/generate-datacenter-docs.sh --metrics-only

# Weekly comprehensive report - domenica notte
0 2 * * 0 /usr/local/bin/generate-datacenter-docs.sh --full --detailed
```

### 7.2 Script Wrapper Esempio
```bash
#!/bin/bash
# generate-datacenter-docs.sh

set -e

LOGFILE="/var/log/datacenter-docs/$(date +%Y%m%d_%H%M%S).log"
LOCKFILE="/var/run/datacenter-docs.lock"

# Prevent concurrent executions
if [ -f "$LOCKFILE" ]; then
    echo "Another instance is running. Exiting."
    exit 1
fi

touch "$LOCKFILE"
trap "rm -f $LOCKFILE" EXIT

# Activate virtual environment
source /opt/datacenter-docs/venv/bin/activate

# Run Python script with parameters
python3 /opt/datacenter-docs/main.py "$@" 2>&1 | tee -a "$LOGFILE"

# Cleanup old logs (keep 30 days)
find /var/log/datacenter-docs/ -name "*.log" -mtime +30 -delete
```

---

## 8. Output e Validazione

### 8.1 Post-Generation Checks
```python
def validate_documentation(section_file):
    """Valida il documento generato"""
    
    checks = {
        'file_exists': os.path.exists(section_file),
        'not_empty': os.path.getsize(section_file) > 0,
        'valid_markdown': validate_markdown_syntax(section_file),
        'no_placeholders': not contains_placeholders(section_file),
        'token_limit': count_tokens(section_file) < 50000
    }
    
    if all(checks.values()):
        logger.info(f"✓ {section_file} validation passed")
        return True
    else:
        failed = [k for k, v in checks.items() if not v]
        logger.error(f"✗ {section_file} validation failed: {failed}")
        return False

def contains_placeholders(file_path):
    """Check per placeholders non sostituiti"""
    with open(file_path, 'r') as f:
        content = f.read()
    patterns = [r'\[.*?\]', r'\{.*?\}', r'TODO', r'FIXME']
    import re
    return any(re.search(p, content) for p in patterns)
```

### 8.2 Notification System
```python
def send_completion_notification(success, sections_updated, errors):
    """Invia notifica a fine generazione"""
    
    message = f"""
    Datacenter Documentation Update
    
    Status: {'✓ SUCCESS' if success else '✗ FAILED'}
    Sections Updated: {', '.join(sections_updated)}
    Errors: {len(errors)}
    
    {'Errors:\n' + '\n'.join(errors) if errors else ''}
    
    Timestamp: {datetime.now().isoformat()}
    """
    
    # Send via multiple channels
    send_email(recipients=['ops-team@company.com'], subject='Doc Update', body=message)
    send_slack(channel='#datacenter-ops', message=message)
    # send_teams / send_webhook as needed
```

---

## 9. Security Considerations

### 9.1 Secrets Management
```python
# NON salvare mai credenziali in chiaro
# Utilizzare sempre un vault

from cryptography.fernet import Fernet
import keyring

def get_credential(service, account):
    """Retrieve credential from OS keyring"""
    return keyring.get_password(service, account)

# Oppure HashiCorp Vault
import hvac

client = hvac.Client(url='https://vault.company.com')
client.auth.approle.login(role_id=ROLE_ID, secret_id=SECRET_ID)
credentials = client.secrets.kv.v2.read_secret_version(path='datacenter/creds')
```

### 9.2 Audit Trail
```python
# Log TUTTE le operazioni per audit
audit_log = {
    'timestamp': datetime.now().isoformat(),
    'user': 'automation-account',
    'action': 'documentation_generation',
    'sections': sections_updated,
    'systems_accessed': list_of_systems,
    'duration': elapsed_time,
    'success': True/False
}

write_audit_log(audit_log)
```

---

## 10. Troubleshooting

### 10.1 Common Issues

| Problema | Causa Probabile | Soluzione |
|----------|----------------|-----------|
| Connection Timeout | Firewall/Network | Verificare connectivity, firewall rules |
| Authentication Failed | Credenziali errate/scadute | Ruotare credenziali, verificare vault |
| API Rate Limit | Troppe richieste | Implementare backoff, ridurre frequency |
| Incomplete Data | Source temporaneamente down | Usare cached data, generare partial doc |
| Token Limit Exceeded | Troppi dati in sezione | Rimuovere dati storici, ottimizzare formato |

### 10.2 Debug Mode
```python
# Abilitare debug per troubleshooting
DEBUG = os.getenv('DEBUG', 'False').lower() == 'true'

if DEBUG:
    logging.getLogger().setLevel(logging.DEBUG)
    # Salvare raw responses per analisi
    with open(f'debug_{timestamp}.json', 'w') as f:
        json.dump(raw_response, f, indent=2)
```

---

## 11. Testing

### 11.1 Unit Tests
```python
import unittest

class TestDataCollection(unittest.TestCase):
    def test_vmware_connection(self):
        """Test connessione a vCenter"""
        result = test_vmware_connection()
        self.assertTrue(result.success)
        
    def test_data_validation(self):
        """Test validazione dati raccolti"""
        sample_data = load_sample_data()
        self.assertTrue(validate_data_structure(sample_data))
```

### 11.2 Integration Tests
```bash
# Test end-to-end in ambiente di test
./run-tests.sh --integration --environment=test

# Verificare che tutti i sistemi siano raggiungibili
./check-connectivity.sh

# Dry-run senza salvare
python3 main.py --dry-run --verbose
```

---

## Checklist Pre-Deployment

Prima di mettere in produzione il sistema:

- [ ] Tutte le librerie installate
- [ ] Credenziali configurate in vault sicuro
- [ ] Connectivity verificata verso tutti i sistemi
- [ ] Permessi account automation validati (read-only)
- [ ] Firewall rules approvate e configurate
- [ ] Logging configurato e testato
- [ ] Notification system testato
- [ ] Cron jobs configurati
- [ ] Backup documentazione esistente
- [ ] Runbook operativo completato
- [ ] Escalation path definito
- [ ] DR procedure documentate

---

**Documento Versione**: 1.0  
**Ultimo Aggiornamento**: 2025-01-XX  
**Owner**: Automation Team