设置页面报错：
The Snorby worker is not currently running. It's imperative you start the worker immediately! All backend calculations are performed asynchronously using the Snorby Worker.
排查思路：手动执行snorby启动（在/etc/init.d/snorby中寻找启动方式）
/usr/local/rvm/rubies/ruby-1.9.3-p545/bin/ruby /opt/snorby/script/delayed_job start
才发现原来是ruby版本不对，导致无法启动，修改/etc/init.d/snorby中的ruby路径即可。
另外还有一种可能，旧的无效delayed_job有问题，需要关闭重启：
sudo pkill -f delayed_job bundle exec rake snorby:update RAILS_ENV=production