Have Unicorn Log to $stdout
A strange quirk of Unicorn is that by default it will write all its logging output to $stderr. Even a relatively harmless operation like a restart will result in noise written to your system error log:
executing ["/home/core/.bundle/gems/ruby/1.8/bin/unicorn_rails", "-c", "config/normalized_unicorn.rb"] (in /home/core)
forked child re-executing...
I, [2012-10-17T09:00:35.029145 #12322] INFO -- : inherited addr=/tmp/core.sock fd=4
I, [2012-10-17T09:00:35.029885 #12322] INFO -- : Refreshing Gem list
reaped #<Process::Status: pid=2784,exited(0)> worker=1
reaped #<Process::Status: pid=2785,exited(0)> worker=2
reaped #<Process::Status: pid=2783,exited(0)> worker=0
master complete
master process ready
worker=1 ready
worker=2 ready
worker=0 ready
Simply redefining Unicorn’s logger to one pointing to $stdout will fix the problem:
# by default, Unicorn will log to $stderr; go to $stdout instead
logger Logger.new($stdout)