Emulate log4j with Ruby Logger

gistfile1.rb

#!/usr/bin/env ruby
require 'logger'
hostname = `hostname`.chop
file = File.open("/var/log/test-#{hostname}.log", File::WRONLY | File::APPEND | File::CREAT)
log = Logger.new(file)
log.level = Logger::INFO
log.formatter = proc do |severity, datetime, progname, msg|
  "#{datetime.strftime('%Y-%m-%d %H:%M:%S,%3N')} #{severity} myproc: #{msg}\n"
end
log.info("Testing")