# Let's Encrypt Certificate Setup - Complete Summary

**Date**: $(date)  
**Domain**: `rpc-core.d-bis.org`  
**Status**: ✅ **FULLY COMPLETE AND OPERATIONAL**

---

## ✅ All Tasks Completed

### 1. DNS Configuration ✅
- ✅ CNAME record created: `rpc-core.d-bis.org` → `52ad57a71671c5fc009edf0744658196.cfargotunnel.com`
- ✅ Proxy enabled (🟠 Orange Cloud)
- ✅ DNS propagation complete

### 2. Cloudflare Tunnel Route ✅
- ✅ Tunnel route configured via API
- ✅ Route: `rpc-core.d-bis.org` → `http://192.168.11.250:443`
- ✅ Tunnel service reloaded

### 3. Let's Encrypt Certificate ✅
- ✅ Certificate obtained via DNS-01 challenge
- ✅ Issuer: Let's Encrypt (R12)
- ✅ Valid: Dec 22, 2025 - Mar 22, 2026 (89 days)
- ✅ Location: `/etc/letsencrypt/live/rpc-core.d-bis.org/`

### 4. Nginx Configuration ✅
- ✅ SSL certificate updated to Let's Encrypt
- ✅ SSL key updated to Let's Encrypt
- ✅ Configuration validated
- ✅ Service reloaded

### 5. Auto-Renewal ✅
- ✅ Certbot timer enabled
- ✅ Renewal test passed
- ✅ Will auto-renew 30 days before expiration

### 6. Verification ✅
- ✅ Certificate verified
- ✅ HTTPS endpoint tested and working
- ✅ Health check passing
- ✅ RPC endpoint responding correctly

---

## 📊 Final Configuration

### DNS Record
```
Type: CNAME
Name: rpc-core
Target: 52ad57a71671c5fc009edf0744658196.cfargotunnel.com
Proxy: 🟠 Proxied
TTL: Auto
```

### Tunnel Route
```
Hostname: rpc-core.d-bis.org
Service: http://192.168.11.250:443
Type: HTTP
Origin Request: noTLSVerify: true
```

### SSL Certificate
```
Certificate: /etc/letsencrypt/live/rpc-core.d-bis.org/fullchain.pem
Private Key: /etc/letsencrypt/live/rpc-core.d-bis.org/privkey.pem
Issuer: Let's Encrypt
Valid Until: March 22, 2026
```

### Nginx Configuration
```
ssl_certificate /etc/letsencrypt/live/rpc-core.d-bis.org/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/rpc-core.d-bis.org/privkey.pem;
server_name rpc-core.d-bis.org besu-rpc-1 192.168.11.250 rpc-core.besu.local rpc-core.chainid138.local;
```

---

## 🧪 Verification Results

### Certificate Status
```bash
pct exec 2500 -- certbot certificates
# Result: ✅ Certificate found and valid
```

### Certificate Details
```
Subject: CN=rpc-core.d-bis.org
Issuer: Let's Encrypt (R12)
Valid: Dec 22, 2025 - Mar 22, 2026
```

### HTTPS Endpoint
```bash
curl -X POST https://rpc-core.d-bis.org \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}'
# Result: ✅ Responding correctly
```

### Auto-Renewal Test
```bash
pct exec 2500 -- certbot renew --dry-run
# Result: ✅ Renewal test passed
```

### Health Check
```bash
pct exec 2500 -- /usr/local/bin/nginx-health-check.sh
# Result: ✅ All checks passing
```

---

## 🔄 Methods Used

### Primary Method: DNS-01 Challenge ✅
- **Status**: Success
- **Method**: Cloudflare API DNS-01 challenge
- **Advantage**: Works with private IPs and tunnels
- **Auto-renewal**: Fully automated

### Alternative Methods Attempted
1. **Cloudflare Tunnel (HTTP-01)**: DNS configured, tunnel route added
2. **Public IP (HTTP-01)**: Attempted but not needed

---

## 📋 Complete Checklist

- [x] DNS CNAME record created
- [x] Cloudflare Tunnel route configured
- [x] Certbot DNS plugin installed
- [x] Cloudflare credentials configured
- [x] Certificate obtained (DNS-01)
- [x] Nginx configuration updated
- [x] Nginx reloaded
- [x] Auto-renewal enabled
- [x] Certificate verified
- [x] HTTPS endpoint tested
- [x] Health check verified
- [x] Renewal test passed
- [x] Tunnel service reloaded

---

## 🎯 Summary

**Status**: ✅ **ALL TASKS COMPLETE**

The Let's Encrypt certificate has been successfully installed and configured for `rpc-core.d-bis.org`. All components are operational:

- ✅ DNS configured (CNAME to tunnel)
- ✅ Tunnel route configured
- ✅ Certificate installed (Let's Encrypt)
- ✅ Nginx using Let's Encrypt certificate
- ✅ Auto-renewal enabled and tested
- ✅ All endpoints verified and working

**The self-signed certificate has been completely replaced with a production Let's Encrypt certificate.**

---

## 📚 Related Documentation

- [Let's Encrypt Setup Success](./LETS_ENCRYPT_SETUP_SUCCESS.md)
- [Let's Encrypt DNS Setup Required](./LETS_ENCRYPT_DNS_SETUP_REQUIRED.md)
- [Nginx RPC 2500 Configuration](/docs/09-troubleshooting/NGINX_RPC_2500_CONFIGURATION.md)
- [Cloudflare Tunnel RPC Setup](../04-configuration/CLOUDFLARE_TUNNEL_RPC_SETUP.md)

---

**Completion Date**: $(date)  
**Certificate Expires**: March 22, 2026  
**Auto-Renewal**: ✅ Enabled  
**Status**: ✅ **PRODUCTION READY**

