Using the Drupal Watchdog

Drupal Austria

Description

This section introduces the Drupal watchdog system (database logging), an essential tool for monitoring, troubleshooting, and maintaining Drupal sites. Learners will understand what the watchdog is, how to access and interpret log messages, and when to use it for debugging errors and tracking system events. By the end of this section, learners will be able to effectively use the watchdog to diagnose problems, understand severity levels, filter relevant log entries, and maintain site health through proper log management.

Goals

• Understand what the Drupal watchdog is - Learners will be able to explain that the watchdog (also known as the database logging module or dblog) is Drupal's system for recording events, errors, and system messages
• Identify when to use the watchdog - Learners will be able to recognize situations where checking the watchdog is necessary, such as troubleshooting errors, monitoring system activity, tracking user actions, debugging module behavior, and investigating site performance issues
• Navigate and understand the watchdog interface - Learners will be able to access the Recent log messages page, understand how log entries are structured (severity levels, event types, messages, timestamps), and filter logs to find relevant information
• Interpret log severity levels - Learners will be able to distinguish between different severity levels (emergency, alert, critical, error, warning, notice, info, debug) and prioritize issues accordingly
• Use watchdog for troubleshooting - Learners will be able to diagnose common site problems by analyzing error messages, identifying patterns in log entries, and understanding the context provided by log details
• Manage watchdog storage and performance - Learners will understand that watchdog stores logs in the database, recognize when log tables need to be cleared to improve performance, and know how to configure log retention settings

Maintainer

Christian Ziegler