Log files can get really huge.
Luckily, it’s easy to automatically rotate your log files in dev/test for a Rails 3 app.
config/development.rb and config/test.rb:
# auto rotate log files, keep 2 of 5MB each config.logger = Logger.new(config.paths.log.first, 1, 5.megabytes)
You can adjust the number of logs and size according to your needs, but this is a good start.
If you get an error because of the 5.megabytes, just put “5242880” instead.