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Because often, despite the quick start procedure, Openshift isn't able to correctly deploy a fresh Drupal 7 installation (for example doesn't provide the default user and password), we can try to install drush (another missing feature). After logging in through ssh to your application, add to app-root/data/.bash_profile:

PATH="$HOME/.composer/vendor/bin:$PATH"

Now we install drush through composer:

composer global require drush/drush:7.*

Dont'worry about composer complaining that it's not updated.

Re-read your bash_profile so that the installation path of drush will be known by the system:

. app-root/data/.bash_profile

All done, now drush should be in your PATH and you can verify by typing the command drush --help

If anything went wrong, check http://docs.drush.org/en/7.x/install/

This, like other bugs on Drpal installation on Openshift, has been already claimed to be solved several times, but as I've experimented, it's not...