First, you need to check out ansible here for the ./doit.sh script to work (e.g., git clone git://github.com/ansible/ansible.git).

The mongo.yml playbook currently provisions a mongodb with a few useful users. You can edit those for your own database needs.

You run it like this: ./doit.sh. Have a look at that file for more details. Again, it expects the ansible source to be available in the current directory.

You'll also need to have a file in the hosts directory that defines the host(s) (e.g. dlab.berkeley.edu). You can just list them one per line. Multiple files is OK.

You'll also need a file called passwords.yml with the 3 *_pass variables used in mongo.yml. You define variables like so (and YAML files should start with ---, see the other files for examples):

varname: "Very long password"