The file looks like this 
dispatchers = file
# need to figure out how to generate name here..
file.class          = Log::Dispatch::File
file.min_level      = debug
file.filename       = log/${HOST}.log
file.mode           = append
file.size           = 102400
file.max            = 10
file.close_after_write = 1
file.format         = [%d] [%p] [%P:%L]%m %n