passenger upgrade ruby debian

upgrade-ruby-rvm-passenger-nginx-debian.sh

#ssh into the server and:
rvm get stable
rvm get head
rvm install ruby-version-that-you-want
rvm gemset use rubyversion@gemset --create

#locally:
#update local version
bundle install
#capfile is set to pull from local version when deploying 
cap deploy
#fail? Likely...

#back on the server:
#recompile passenger with nginx:
#http://www.modrails.com/documentation/Users%20guide%20Nginx.html#rubygems_generic_install
#-first make a backup of your nginx dir
#grab the latest passenger gem: 
gem install passenger

#install the passenger nginx module which recompiles and works with your ruby and gemset:
sudo su
passenger-install-nginx-module

#replace the blob of virtual server output at the end in the nginx.conf file

#verify it’s running: 
passenger-memory-stats

deploy again. Maybe restart nginx and touch passenger. Make sure you haven't hardcoded any strings containing old ruby version.

profit!