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Set Up Ansible
Install Ansible
The Ansible documentation has installation instructions. Note the control machine requirements. At the time of writing, the control machine had to have Python 2.6 or 2.7. (Support for Python 3 is a goal of Ansible 2.2.) You can ensure you're using a supported version of Python by creating a special Python 2.x virtualenv and installing Ansible in it. For example:
cd repos/bigchaindb/ntools
virtualenv -p /usr/local/lib/python2.7.11/bin/python ansenv
source ansenv/bin/activate
pip install ansible
Create an Ansible Inventory File
An Ansible "inventory" file is a file which lists all the hosts (machines) you want to manage using Ansible. (Ansible will communicate with them via SSH.) Ansible expects the inventory file to be /etc/ansible/hosts by default (but you can change that). Here's an example Ansible inventory file for a one-machine BigchainDB node:
node1 ansible_host=192.0.2.128
node1 is a "host alias" (i.e. a made-up name) that you can use when referring to that host in Ansible.
192.0.2.128 is an example IP address (IPv4): the public IP address of the node.