Code Quality Rank: L5
Monthly Downloads: 124,481
Programming language: Ruby
License: GNU General Public License v3.0 or later
Tags: Logging    

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Log4r - A flexible logging library for Ruby

This release 1.1.11
Release date 04/Jan/2014
License BSD
Maintainer Colby Gutierrez-Kraybill
Leon Torres Original Maintainer
Martain Stannard RollingFileOutputter
Steve Lumos SyslogOutputter
Mark Lewandowski ScribeOutputter
Andreas Hund YamlConfigurator
Jamis Buck log4r.gemspec
Charles Strahan log4jxml/chainsaw integration
Nitay Joffe STARTTLS
David Siegal Smart updates to RollingFileOutputter


Log4r is a comprehensive and flexible logging library written in Ruby for use in Ruby programs. It features a hierarchical logging system of any number of levels, custom level names, logger inheritance, multiple output destinations per log event, execution tracing, custom formatting, thread safteyness, XML and YAML configuration, and more.


  1. (required) Ruby >= 1.7.0 (use log4r 1.0.2 for Ruby 1.6)
  2. (optional) RubyGems for installing Log4r as a gem
  3. (optional) Ruby syslog library for SyslogOutputter
  4. (optional) XML configuration requires REXML
  5. (optional) log4j chainsaw integration requires 'builder' >= 2.0
  6. (optional) STARTTLS email login, requires 'smtp_tls" if Ruby <= 1.8.6

More Info

  • Installation instructions are in the file INSTALL
  • Comprehensive examples are provided in examples/ and can be run right away
  • Log4r homepage: doc/index.html
  • Manual: doc/manual.html
  • RDoc API reference: doc/rdoc/index.html
  • The changelog
  • Feel free to bug the maintainer with any questions (listed at top of file)


Log4r works really well, so please take advantage of it right away! :) All versions since 0.9.2 have been stable and backward-compatible. The code is stable enough that updates are infrequent and usually only for adding features or keeping the code up to date with Ruby.

Platform Issues

Log4r is known to work on Linux and WindowsXP. It's safe to assume that Log4r will work on any Ruby-supported platform.

When Trouble Strikes

Log4r comes with an internal logger. To see its output, create a logger named 'log4r' before any others and give it a suitable outputter,

trouble = Logger.new['log4r'] trouble.add Outputter.stdout

Try running the unit tests provided (run the file tests/runtest.rb). Let the maintainer know what's up and feel free to explore and fix the code yourself. It's well documented and written in Ruby. :)

*Note that all licence references and agreements mentioned in the Log4r README section above are relevant to that project's source code only.