Follow the installation instructions for your particular OS but feel free to omit the Redis installation.

After cloning NodeBB, ensure that you run:

npm install levelup leveldown

Finally, set up a directory to store your LevelDB database, for example:

mkdir /var/level/

Run the NodeBB install, select level when it prompts you for your database. If you created the folder as above, you can leave the rest of the questions as default.