luxifer/dokku-redis-plugin — pull request #22 by BradWhittington (2014-02-26 08:54:59+00:00)
Title: Check that a redis instance actually exists

The pre-release hook causes containers without matching redis containers to always get an environment variable that looks like: REDIS_URL=redis://:6379 set. This is a problem if you wish to share one redis instance between two containers, or name your redis instance with a name that doesn't match the app name, and later link it manually.