This topic is about some general problems when I depoly rails app.
After I set up server environment, I cloned source code by git. Usually, we need do some steps to make sure it works on production environment.
gem we need install
bundle install
initial mongodb
rake db:seed
compile files we need for production
rake assets:precompile --trace RAILS_ENV=production
install javascript runtime
sudo apt-get install nodejs
or from package src
apt-get install make python g++
mkdir ~/nodejs && cd $_
wget -N http://nodejs.org/dist/node-latest.tar.gz
tar xzvf node-latest.tar.gz && cd \`ls -rd node-v*\`
make install