Drush 6, the current stable version, does not work with Drupal 8. We will need Drush 7 for that. See https://github.com/drush-ops/drush#drush-versions.

Drush 7 is not stable yet so we want to keep running Drush 6 for Drupal 7 but use Drush 7 with Drupal 8. Here’s how you can run multiple versions of Drush:

Step 1

Get Drush 7 via git. You could clone it to your home directory.

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$ git clone https://github.com/drush-ops/drush.git ~/drush7

Step 2

Setup a bash alias by adding the following line to ~/.bash_profile or ~/.bashrc.

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$ alias drush7='~/drush7/drush'

Step 3

Reload ~/.bash_profile or ~/.bashrc.

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$ source ~/.bash_profile

Test

You should now be able to run Drush commands for drupal 8. Try clearing the cache with:

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$ drush7 cc all