As is the case with a couple other database management systems, Cloud9 workspaces come with redis pre-installed.
Start the server:
sudo service redis-server start
Connect with the client:
You can then connect to the database with following parameters:
- Hostname -
$IP (The same local IP as the application you run on Cloud9)
- Port -
6379 (The default Redis port number)
- Password - "" (No password since you can only access the DB from within the workspace)
See http://redis.io/clients for drivers.