OpenStack director now uses Ansible for software configuration of the overcloud nodes. Ansible provides a more familiar and debuggable operator experience during overcloud deployment. Ansible is used to replace the communication and transport of the software configuration deployment data between heat and the heat agent (os-collect-config) on the overcloud nodes. Instead of os-collect-config running on each overcloud node and polling for deployment data from heat, the Ansible control node applies the configuration by running an ansible-playbook with an Ansible inventory file and a set of playbooks and tasks. The Ansible control node (the node running ansible-playbook) is the undercloud by default.