Can you run a rails console or rake command in the elastic beanstalk environment?
None of these solutions mentioned here worked for me, so I cooked up a little script that I put in script/aws-console.
You can run it from the /var/app/current directory as root:
eb ssh
cd /var/app/current
sudo script/aws-console
My script can be found as a Gist here.
Don't know why, but since EBS runs everything as root, this worked for me:
sudo su
bundle exec rails c production
For rails, jump to /var/app/current
then as @juanpastas said, run RAILS_ENV=production bundle exec rails c