Ansible is a configuration management systems - we can specify configuration details on a central machine and push them out to all the other machine on the network (putty and chef are similar systems, we use ansible since it's lightweight and so is kinder to raspberry pi's).
Ansible runs on Adminstuff (formerly Denning)
In order to use ansible you will need an ssh public key in the ansible setup, to get your key added ask on the mailing list for someone in the sysadmin group to add you. Note that this is a right, not a privilege, there is a degree of responsibility associated with having root on all the hackspace infrastructure machines!
There is more documentation in /etc/ansible/000README on adminstuff.