Varnish Log Viewer

Introduction

This module help with viewing and analyzing Varnish cache logs directly in Drupal. It monitors cache hit rates, filter requests by URL/status/cache status, and troubleshoot performance issues. It includes Drush commands for Acquia Cloud and restricted environments.

Features

• Log Viewer: Browse recent Varnish access logs at /admin/reports/varnish-logs
• Filtering: Filter by URL pattern, HTTP status code (200, 404, 500, etc.), and cache status (HIT/MISS/PASS)
• Error Logs: Dedicated view for 4xx/5xx error responses
• Statistics Dashboard: Cache hit/miss rates and request statistics
• Drush Commands:
  • drush varnish:sync-logs: Sync logs to readable cache file
  • drush varnish:stats: Display cache statistics
  • drush varnish:tail: Real-time log tailing with filters
• Acquia Cloud Support: Handles Acquia's extended log format

Post-Installation

1. Enable the module with drush en varnish_log_viewer
2. Configure the log file path at /admin/config/system/varnish-log-viewer
3. If PHP cannot read logs directly (common on managed hosting), run drush varnish:sync-logs
4. View logs at /admin/reports/varnish-logs

Additional Requirements

• PHP 8.1 or higher
• Drupal 10 or 11
• Drush 12+ (for CLI commands)
• Access to Varnish log files (varnishncsa format)

Recommended modules/libraries

• Purge
  Cache invalidation framework
• Varnish Purge
  Varnish cache tag invalidation

Similar projects

• Syslog
  Core logging to system log
• DBLog
  Core database logging

Supporting this Module

• Report issues in the issue queue
• Submit patches or merge requests
• Contribute documentation improvements