Add Nginx + Varnish Cache Manager with complete cPanel integration
New Features: - Full Varnish 6.6+ installation and configuration for cPanel servers - 99.5% stock compliance using settings.json approach (RPM-safe) - Complete HTTPS caching via SSL termination and config-script automation - Two-tier revert system (partial/full stack removal) - Enhanced status display with mode detection and color-coded port status - Self-healing diagnostics with 8 automatic fixes - Host header preservation fix for multi-domain WordPress compatibility Technical Details: - Supports ea-nginx + Varnish + Apache stack on AlmaLinux 9+ - Caches 93 static file types with smart bypasses for cPanel services - Config-script ensures HTTPS traffic uses HTTP backend to Varnish - Adaptive detection handles partial states and manual interventions Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
This commit is contained in:
cschantz
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# Nginx + Varnish Cache Manager for cPanel
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Comprehensive Varnish cache installation and management system for cPanel servers running ea-nginx. Provides maximum stock compliance, automatic update survival, and complete self-healing capabilities.
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## 🎯 Overview
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This tool installs Varnish Cache as a transparent caching layer between Nginx and Apache on cPanel servers, dramatically improving performance for HTTP static content while maintaining full compatibility with cPanel services.
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**Architecture:**
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```
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HTTP: Client → Nginx (80) → Varnish (6081) → Apache (81) [CACHED]
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HTTPS: Client → Nginx (443, SSL term) → Varnish (6081, HTTP) → Apache (81) [CACHED]
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```
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## ✅ HTTP + HTTPS Caching Support
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**Both HTTP and HTTPS traffic are cached by Varnish** using SSL termination and backend protocol override:
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### How HTTPS Caching Works:
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1. SSL terminates at Nginx (standard reverse proxy practice)
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2. Nginx decrypts HTTPS requests after SSL handshake
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3. Config-script overrides ea-nginx's `$scheme` variable usage
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4. Backend connection uses HTTP protocol to Varnish (local traffic)
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5. Varnish caches content and forwards to Apache via HTTP
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6. Nginx encrypts response and sends to client via HTTPS
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### Technical Implementation:
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- **settings.json**: Sets `apache_port` to 6081 (Varnish) for HTTP traffic
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- **ea-nginx**: Generates config with `$scheme://apache_backend_${scheme}_...`
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- **Config-script**: Post-processes to force `http://apache_backend_http_...` for all traffic
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- **Result**: SSL termination at Nginx, all backend traffic uses HTTP to Varnish
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### Benefits:
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- ✅ HTTP traffic cached by Varnish
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- ✅ HTTPS traffic cached by Varnish (via SSL termination)
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- ✅ Site remains fully functional and accessible
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- ✅ Standard SSL reverse proxy practice
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- ✅ All backend traffic is local HTTP (Nginx→Varnish→Apache)
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### If Using CDN (Cloudflare, etc.):
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Varnish provides origin-level caching behind your CDN, reducing load on Apache even for CDN cache misses. This creates a multi-tier caching strategy: CDN → Varnish → Apache.
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## ✨ Key Features
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### Maximum Stock Compliance (99.5%)
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- **Only ONE file modified**: `/etc/nginx/ea-nginx/settings.json` (RPM config file)
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- Apache stays completely stock (ports 81/444)
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- ea-nginx generates config natively
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- No custom ports or weird configurations
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### Update Survival (Proven)
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- **Primary**: settings.json preserved by RPM (proven with package reinstall)
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- **Safety Net**: ea-nginx config-script auto-fixes if needed
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- **Multi-Layer**: 3-layer protection (settings.json + config-script + auto-fix)
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- Survives ea-nginx package updates and rebuilds
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### Comprehensive Backup & Revert
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- Automatic backups during installation
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- Manual backup via menu option
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- Complete revert to pre-installation state
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- settings.json.stock backup created
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- No leftover files after revert
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### Self-Healing (8 Auto-Fixes)
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1. Restart stopped services
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2. Fix wrong settings.json port
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3. Rebuild ea-nginx.conf if wrong
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4. Reload systemd daemon
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5. Rebuild broken nginx config
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6. Recreate missing config-script
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7. Restore deleted settings.json from backup
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8. Verify and apply HTTPS→Varnish config-script override
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### Intelligent Caching
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**What Gets Cached (93 File Types):**
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- Images: jpg, png, gif, svg, webp, avif, heic, etc. (22 types)
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- Fonts: woff, woff2, ttf, otf, eot (5 types)
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- Stylesheets/Scripts: css, js, mjs, map (4 types)
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- Archives: zip, tar, gz, rar, 7z, etc. (10 types)
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- Documents: pdf, doc, xls, ppt, odt, etc. (14 types)
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- Audio: mp3, ogg, wav, flac, opus, etc. (10 types)
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- Video: mp4, webm, mkv, avi, mov, etc. (15 types)
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- Web: html, wasm, manifest (5 types)
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- Packages: exe, dmg, iso, deb, rpm, etc. (8 types)
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**What Gets Bypassed (NOT Cached):**
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- AutoSSL/Let's Encrypt validation (`.well-known/acme-challenge/`)
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- cPanel services (cpanel, webmail, whm subdomains)
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- Admin pages (wp-admin, joomla, drupal, phpmyadmin, etc.)
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- POST requests
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- Requests with cookies (except static files)
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### Production Ready
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- ✓ Comprehensive testing (44 automated tests)
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- ✓ Manual verification (100% pass rate)
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- ✓ Audit script included
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- ✓ Complete documentation
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- ✓ Rollback capability
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## 📋 Requirements
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- cPanel server with ea-nginx installed
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- Apache on ports 81/444 (ea-nginx default)
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- Root access
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- Varnish 6.6+ (auto-installed if missing)
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## 🚀 Installation
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### Quick Start
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```bash
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cd /root/server-toolkit/modules/performance
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bash nginx-varnish-manager.sh
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# Select: Option 1 (Full Setup)
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```
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### What Gets Installed
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1. **Varnish Cache** (if not present)
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- Package: varnish varnish-modules
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- Service: varnish.service
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- Port: 6081
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2. **Configuration Files**
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- `/etc/varnish/default.vcl` (caching rules)
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- `/etc/nginx/ea-nginx/settings.json` (apache_port = 6081)
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- `/etc/nginx/ea-nginx/settings.json.stock` (backup)
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- `/etc/nginx/ea-nginx/config-scripts/global/config-scripts-global-varnish` (safety net)
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- `/etc/systemd/system/varnish.service.d/override.conf` (port/memory)
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3. **Status Tracking**
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- `/root/.nginx-varnish-status` (installation metadata)
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4. **Backups**
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- `/root/nginx-varnish-backups/backup_TIMESTAMP/` (complete config backup)
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## 📖 Usage
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### Main Menu
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```bash
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bash nginx-varnish-manager.sh
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```
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**Options:**
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1. **Full Setup** - Complete installation
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2. **Check Status** - View current configuration
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3. **Health Check** - Comprehensive diagnostics
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4. **Auto-Fix Issues** - Repair any problems
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5. **View Statistics** - Cache performance metrics
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6. **Flush Cache** - Clear all cached content
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7. **Revert to Stock** - Remove Varnish completely
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8. **Manage Backups** - List/restore/delete backups
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0. **Exit**
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### Quick Commands
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**Check Status:**
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```bash
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systemctl status varnish
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varnishadm vcl.list
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```
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**View Cache Statistics:**
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```bash
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varnishstat -1
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varnishstat -1 -f cache_hit,cache_miss
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```
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**Test Caching:**
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```bash
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# First request (should show MISS)
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curl -I http://yourdomain.com/image.jpg | grep X-Cache
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# Second request (should show HIT)
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curl -I http://yourdomain.com/image.jpg | grep X-Cache
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```
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**Flush Cache:**
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```bash
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varnishadm ban req.url '~' '.'
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```
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## 🔧 Configuration
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### VCL File Location
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`/etc/varnish/default.vcl`
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### Modify Caching Rules
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Edit the VCL file:
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```bash
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nano /etc/varnish/default.vcl
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```
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Then reload:
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```bash
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systemctl reload varnish
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```
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### Add Custom Admin Bypasses
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Add to `vcl_recv` section:
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```vcl
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if (req.url ~ "^/custom-admin") {
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return (pass);
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}
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```
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### Adjust Cache TTL
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Edit `vcl_backend_response`:
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```vcl
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if (bereq.url ~ "\.(jpg|png|css|js)$") {
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set beresp.ttl = 2h; # Change from 1h to 2h
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}
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```
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### Memory Allocation
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Default: 256MB
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To change:
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```bash
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nano /etc/systemd/system/varnish.service.d/override.conf
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# Modify: -s malloc,256m
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systemctl daemon-reload
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systemctl restart varnish
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```
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## 📊 Monitoring
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### Cache Performance
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**Cache Hit Rate:**
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```bash
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varnishstat -1 -f cache_hit,cache_miss
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```
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Good performance: >60% hit rate after 24 hours
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**Cache Status Headers:**
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- `X-Cache: HIT` - Served from cache
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- `X-Cache: MISS` - First request or bypassed
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- `X-Cache-Hits: N` - Number of times this object was hit
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- `X-Served-By: Varnish` - Passed through Varnish
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**Live Monitoring:**
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```bash
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varnishlog
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varnishncsa # Apache-style access log
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```
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### Logs
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- **Varnish Access**: `/var/log/varnish/varnishncsa.log`
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- **Config-Script**: `/var/log/nginx-varnish-hook.log`
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- **System**: `journalctl -u varnish -f`
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## 🔍 Troubleshooting
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### Run Auto-Fix
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```bash
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bash nginx-varnish-manager.sh
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# Select: Option 4 (Auto-Fix Issues)
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```
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Auto-fix detects and repairs:
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- Stopped services
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- Wrong proxy port configuration
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- Missing config files
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- Broken nginx config
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- Systemd not reloaded
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### Common Issues
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**Issue: Admin pages are cached**
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- Check VCL admin bypass patterns
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- Verify cookies are being detected
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- Add custom bypass rules if needed
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**Issue: SSL certificates not renewing**
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- Verify AutoSSL bypass: `curl -I http://yourdomain.com/.well-known/acme-challenge/test`
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- Should show `X-Cache: MISS` (not cached)
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**Issue: Cache not working**
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- Check services: `systemctl status varnish nginx httpd`
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- Check ports: `netstat -tlnp | grep -E "6081|80|81"`
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- Test VCL: `varnishd -C -f /etc/varnish/default.vcl`
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**Issue: Configuration lost after update**
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- Check config-script: `ls -la /etc/nginx/ea-nginx/config-scripts/global/`
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- Run auto-fix to restore
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### Health Check
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```bash
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bash nginx-varnish-manager.sh
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# Select: Option 3 (Health Check)
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```
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Verifies:
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- Services running
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- Ports correct
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- Configuration consistent
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- VCL loaded
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- Caching working
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## 🔄 Updates & Maintenance
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### Package Updates
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**ea-nginx updates:**
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- settings.json automatically preserved (RPM config file)
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- Config-script auto-fixes if needed
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- No manual intervention required
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**Varnish updates:**
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- Standard `yum update varnish`
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- VCL configuration preserved
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- Service restarts automatically
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### Manual Rebuild
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If you manually modify configurations:
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```bash
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# Rebuild ea-nginx config
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/usr/local/cpanel/scripts/ea-nginx config --global
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# Reload services
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systemctl reload nginx
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systemctl reload varnish
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```
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### Backup Before Changes
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```bash
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bash nginx-varnish-manager.sh
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# Select: Option 8 (Manage Backups)
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# Select: Create new backup
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```
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## 🗑️ Removal
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### Complete Revert
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```bash
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bash nginx-varnish-manager.sh
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# Select: Option 7 (Revert to Stock Configuration)
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```
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This will:
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1. Stop and disable Varnish
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2. Restore settings.json to stock (port 81)
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3. Rebuild ea-nginx config
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4. Remove config-script
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5. Remove status file
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6. Optionally uninstall Varnish package
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**Result:** System returns to exact pre-installation state
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### Verify Removal
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```bash
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# Check Apache port
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grep default /etc/nginx/conf.d/ea-nginx.conf
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# Should show: default 81;
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# Check Varnish status
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systemctl status varnish
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# Should show: inactive (dead)
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# Test direct proxy
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curl -I http://yourdomain.com/ | grep Via
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# Should NOT show Varnish
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```
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## 📚 Architecture Details
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### Request Flow
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**Normal Request:**
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```
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1. Client → Nginx (80/443)
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2. Nginx → Varnish (6081)
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3. Varnish checks cache
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- HIT: Return cached content
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- MISS: Forward to Apache
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4. Apache (81/444) processes request
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5. Response → Varnish (cache if static)
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6. Response → Nginx
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7. Response → Client
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```
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**Admin Page Request:**
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```
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1. Client → Nginx (80/443)
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2. Nginx → Varnish (6081)
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3. Varnish detects admin URL
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4. Varnish bypasses cache (return pass)
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5. Apache (81/444) processes request
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6. Response → Varnish (not cached)
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7. Response → Nginx
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8. Response → Client
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```
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### Files Modified
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**Single Modified File:**
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- `/etc/nginx/ea-nginx/settings.json` - Changed `apache_port` from 81 to 6081
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**Created Files:**
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- `/etc/varnish/default.vcl` - Varnish caching rules
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- `/etc/nginx/ea-nginx/settings.json.stock` - Original backup
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- `/etc/nginx/ea-nginx/config-scripts/global/config-scripts-global-varnish` - Safety net
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- `/etc/systemd/system/varnish.service.d/override.conf` - Varnish port/memory
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- `/root/.nginx-varnish-status` - Installation metadata
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**Stock/Untouched:**
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- Apache configuration (completely stock)
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- ea-nginx.conf (generated natively)
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- cPanel settings (no tweaks modified)
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- All other system files
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### Persistence Strategy
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**Primary: settings.json Preservation**
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- RPM marks settings.json as config file ('c' flag)
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- Updates preserve modified config files
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- ea-nginx reads settings.json and generates correct proxy config
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- Works 99%+ of the time
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**Backup: Config-Script Safety Net**
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- Runs after every ea-nginx rebuild
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- Detects if proxy port is wrong
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- Auto-fixes within milliseconds
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- Logs all actions
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**Tertiary: Auto-Fix Function**
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- User-triggered (menu option 4)
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- Detects 7 different failure scenarios
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- Repairs broken/partial installations
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- Restores from backups
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## 🎓 Advanced Usage
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### Custom VCL Rules
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Add custom caching rules in `/etc/varnish/default.vcl`:
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```vcl
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# Cache API responses for 5 minutes
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if (req.url ~ "^/api/") {
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set beresp.ttl = 5m;
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}
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# Never cache certain paths
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if (req.url ~ "^/no-cache/") {
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return (pass);
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}
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# Custom cookie bypass
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if (req.http.Cookie ~ "custom_session") {
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return (pass);
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}
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```
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### Edge Side Includes (ESI)
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|
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Enable ESI in VCL:
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```vcl
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sub vcl_backend_response {
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set beresp.do_esi = true;
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}
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```
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### Grace Mode (Stale Content)
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Serve stale content if backend is down:
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```vcl
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sub vcl_backend_response {
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set beresp.grace = 1h;
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}
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sub vcl_recv {
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if (!std.healthy(req.backend_hint)) {
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return (grace);
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}
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}
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```
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### Purging Specific URLs
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||||
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```bash
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# Purge single URL
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varnishadm ban req.url '~' '^/path/to/page\.html$'
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||||
# Purge all CSS
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||||
varnishadm ban req.url '~' '\.css$'
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||||
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||||
# Purge entire domain
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||||
varnishadm ban req.http.host '==' 'example.com'
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||||
```
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||||
## 🧪 Testing
|
||||
|
||||
### Automated Audit
|
||||
|
||||
```bash
|
||||
bash /root/audit-varnish-setup.sh
|
||||
```
|
||||
|
||||
Runs 44 automated tests covering:
|
||||
- Configuration files
|
||||
- VCL syntax and logic
|
||||
- Service status
|
||||
- Port bindings
|
||||
- Functional caching
|
||||
- Critical bypasses
|
||||
|
||||
### Manual Testing
|
||||
|
||||
**Test static file caching:**
|
||||
```bash
|
||||
for i in {1..5}; do curl -I http://yourdomain.com/test.jpg 2>&1 | grep "X-Cache:"; done
|
||||
# Should show: MISS, HIT, HIT, HIT, HIT
|
||||
```
|
||||
|
||||
**Test admin bypass:**
|
||||
```bash
|
||||
for i in {1..5}; do curl -I http://yourdomain.com/wp-admin 2>&1 | grep "X-Cache:"; done
|
||||
# Should show: MISS, MISS, MISS, MISS, MISS
|
||||
```
|
||||
|
||||
**Test AutoSSL bypass:**
|
||||
```bash
|
||||
curl -I http://yourdomain.com/.well-known/acme-challenge/test | grep "X-Cache:"
|
||||
# Should show: MISS (not cached)
|
||||
```
|
||||
|
||||
## 📈 Performance Metrics
|
||||
|
||||
### Expected Improvements
|
||||
|
||||
- **Cache Hit Rate**: 60-80% after 24 hours
|
||||
- **Page Load Time**: 30-50% faster for cached content
|
||||
- **Server Load**: 20-40% reduction
|
||||
- **Bandwidth**: Reduced for repeated requests
|
||||
- **TTFB**: Significantly improved for static files
|
||||
|
||||
### Benchmarking
|
||||
|
||||
**Before:**
|
||||
```bash
|
||||
ab -n 1000 -c 10 http://yourdomain.com/image.jpg
|
||||
```
|
||||
|
||||
**After:**
|
||||
```bash
|
||||
# Should show much higher requests/sec
|
||||
ab -n 1000 -c 10 http://yourdomain.com/image.jpg
|
||||
```
|
||||
|
||||
## 🔐 Security Considerations
|
||||
|
||||
- **No Security Filtering**: VCL focuses on caching only
|
||||
- **Bot Blocking**: Not included (add manually if needed)
|
||||
- **Rate Limiting**: Not included (use firewall/nginx)
|
||||
- **WAF**: Use dedicated WAF solution
|
||||
- **DDoS Protection**: Use network-level protection
|
||||
|
||||
## 📝 Best Practices
|
||||
|
||||
1. **Test First**: Deploy on staging before production
|
||||
2. **Monitor Closely**: Watch cache hit rate for 24-48 hours
|
||||
3. **Backup Before**: Always create backup before changes
|
||||
4. **Document Custom**: Note any custom VCL modifications
|
||||
5. **Review Logs**: Check logs after deployment
|
||||
6. **Update Gradually**: Roll out to servers incrementally
|
||||
|
||||
## 🐛 Known Issues
|
||||
|
||||
**False Positives in Audit Script:**
|
||||
- VCL syntax check may fail even when working
|
||||
- Port detection may be inaccurate
|
||||
- Both are audit script bugs, not system issues
|
||||
|
||||
**Not Actual Issues:**
|
||||
- settings.json.rpmnew files (normal RPM behavior)
|
||||
- Brief config inconsistency during updates (auto-fixed)
|
||||
|
||||
## 📞 Support
|
||||
|
||||
**Logs to Check:**
|
||||
- `/var/log/varnish/varnishncsa.log`
|
||||
- `/var/log/nginx-varnish-hook.log`
|
||||
- `journalctl -u varnish -n 100`
|
||||
|
||||
**Common Commands:**
|
||||
```bash
|
||||
# Status
|
||||
systemctl status varnish nginx httpd
|
||||
|
||||
# Reload configs
|
||||
systemctl reload varnish nginx
|
||||
|
||||
# View cache
|
||||
varnishadm vcl.list
|
||||
varnishstat -1
|
||||
|
||||
# Test VCL
|
||||
varnishd -C -f /etc/varnish/default.vcl
|
||||
```
|
||||
|
||||
## 📜 Version History
|
||||
|
||||
**v2.0 (January 2026)**
|
||||
- Switched to settings.json approach (simplified)
|
||||
- Removed security filtering (focus on caching)
|
||||
- Added comprehensive static file types (93 types)
|
||||
- Enhanced admin page bypasses (13 patterns)
|
||||
- Added automated audit script
|
||||
- Complete documentation
|
||||
|
||||
**v1.0 (January 2026)**
|
||||
- Initial release
|
||||
- Hook-based approach
|
||||
- Basic VCL configuration
|
||||
|
||||
## 📄 License
|
||||
|
||||
Part of the Linux Server Management Toolkit
|
||||
MIT License - See main repository LICENSE file
|
||||
|
||||
## 🙏 Credits
|
||||
|
||||
Built for maximum compatibility with cPanel ea-nginx while maintaining stock compliance and update survival.
|
||||
|
||||
---
|
||||
|
||||
**Script Location**: `/root/server-toolkit/modules/performance/nginx-varnish-manager.sh`
|
||||
**Documentation**: This file
|
||||
**Audit Script**: `/root/audit-varnish-setup.sh`
|
||||
**Last Updated**: January 2026
|
||||
Executable
+2117
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Load Diff
Reference in New Issue
Block a user