Install Drush 7 With Composer
Drupal 8 requires Drush >= 7 to work properly. If you try to use Drush 6 with Drupal 8, you'll get errors like this
PHP Fatal Error: Class 'Drupal' not found in .../core/includes/bootstrap.inc on line 178
You can install Drush using Composer. The following example assumes you are ssh'd into a Vagrant box and Composer is installed.
Install Drush with Composer
sudo composer global require drush/drush:dev-master
This will install the latest Drush 7.0-dev release (or whatever is most current).
Add a symlink
Here's the part that assumes you're in a Vagrant machine. You can adjust this to reflect your own environment or even add the path to your $PATH variable in ~/.bashrc.
sudo ln -s /home/vagrant/.composer/vendor/bin/drush /usr/bin/drush
Check your work
# This should return something like # Drush Version : 7.0-dev drush version
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