Quick notes on how to migrate existing Octopress setup (version 2) to new environment.
Here, I am migrating from lite.nitrous.io (now obsolete) to pro.nitrous.io.

Steps

• clone source branch => git clone <url> --branch source <folder-name>
• Check Ruby version. It should be 1.9.3
• cd in Octopress work folder:
• gem install bundler
• bundle install

If not already set:
git config --global user.email "name@example.com"
git config --global user.name "your\_userusername"

• rake setup_github_pages
• reset HEAD in _deploy folder:
  git fetch
git reset --hard origin/master

Try:

• rake generate
• rake preview
• rake deploy