configure_nginx_manager/CHEATSHEET_EN.md

⚡ SSL Certificate Cheatsheet

🚀 Quick Start

Installation in 3 Commands

sudo make install
sudo nano /etc/letsencrypt/regru_config.json  # Fill in data
sudo make test-cert                            # Test

---

🧪 Testing (NO Let's Encrypt Limits)

# Create test certificate (unlimited)
sudo make test-cert

# Check status
sudo make status

# View logs
sudo make logs

When to use:

• ⚠️ Let's Encrypt: max 5 certificates/week
• ✅ Test: UNLIMITED
• ⚡ Creation: 1-2 seconds vs 2-5 minutes

---

🔒 Production (Let's Encrypt)

# Get real certificate
sudo make obtain

# Automatic mode (check + renewal)
sudo make run

# Force renewal
sudo make renew

---

📋 Main Commands

Command	Description	Limits
make test-cert	Test certificate	✅ None
make obtain	New Let's Encrypt	⚠️ 5/week
make renew	Renew existing	⚠️ 5/week
make run	Auto mode	⚠️ 5/week
make status	System status	-
make logs	Show logs	-
make check-config	Check configuration	-

---

📝 Configuration

Minimal (testing)

{
    "domain": "test.example.com",
    "wildcard": true,
    "cert_dir": "/etc/letsencrypt/live"
}

Full (production + NPM)

{
    "regru_username": "myuser",
    "regru_password": "mypassword",
    "domain": "example.com",
    "wildcard": true,
    "email": "admin@example.com",
    "renewal_days": 30,
    "npm_enabled": true,
    "npm_host": "https://npm.example.com",
    "npm_email": "admin@example.com",
    "npm_password": "npm_password"
}

---

🔄 Workflow

Development → Production

# 1. Development (test certificates)
sudo make test-cert              # Create test
# Test application...

# 2. Production (Let's Encrypt)
sudo rm -rf /etc/letsencrypt/live/example.com/  # Remove test
sudo make obtain                 # Create production

---

📁 Important Paths

# Configuration
/etc/letsencrypt/regru_config.json

# Certificates
/etc/letsencrypt/live/example.com/
├── privkey.pem      # Private key
├── cert.pem         # Certificate
├── fullchain.pem    # Full chain (for nginx)
└── chain.pem        # CA chain

# Scripts
/opt/letsencrypt-regru/letsencrypt_regru_api.py

# Logs
/var/log/letsencrypt_regru.log

---

🔍 Verification

# Check configuration
sudo make check-config

# Check certificate
openssl x509 -in /etc/letsencrypt/live/example.com/cert.pem -text -noout

# Check expiration date
openssl x509 -in /etc/letsencrypt/live/example.com/cert.pem -noout -dates

# Check systemd
sudo systemctl status letsencrypt-regru.timer
sudo systemctl list-timers letsencrypt-regru.timer

# Check cron
sudo crontab -l | grep letsencrypt

---

🐛 Debugging

# Detailed logs
sudo make logs

# Test run with details
sudo python3 /opt/letsencrypt-regru/letsencrypt_regru_api.py \
    -c /etc/letsencrypt/regru_config.json --check -v

# Certbot logs
sudo tail -f /var/log/letsencrypt/letsencrypt.log

# Systemd logs
sudo journalctl -u letsencrypt-regru.service -f

---

⚠️ Common Errors

Let's Encrypt: Rate limit exceeded

# SOLUTION: Use test certificates
sudo make test-cert

NPM: Certificate not found

# SOLUTION: Check NPM settings
sudo make check-config

# Check connection
curl -k https://npm.example.com

Permission denied

# SOLUTION: Run with sudo
sudo make test-cert

---

🎯 Use Case Scenarios

Local Development

sudo make test-cert
# Open https://localhost (ignore warning)

CI/CD Testing

# In pipeline
sudo make test-cert
# Run tests...
sudo make status

Staging Environment

sudo make test-cert  # Or
sudo make obtain     # If domain available

Production Environment

sudo make install
sudo make obtain
# Automatic renewal via cron/systemd

---

📚 Documentation

• README.md - Complete guide (1420+ lines)
• TESTING_GUIDE.md - Testing guide (370+ lines)
• PROJECT_STRUCTURE.md - Project structure
• CHEATSHEET.md - This cheatsheet

---

🆘 Quick Help

# Show all commands
make help

# Check installation
sudo make status

# Complete reinstall
sudo make uninstall
sudo make install

---

💡 Tips

1. Always start with test certificates - avoid limits
2. Check configuration - make check-config
3. Monitor logs - make logs
4. Automate - systemd/cron already configured
5. Keep backups of configuration

---

Version: 2.1
Updated: 27.10.2025