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Configure a One-Machine Node
In this step, we will install and configure all the software necessary to run BigchainDB, all on one machine.
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.) Right now, we only want to manage one host.
First, determine the public IP address of the host (i.e. something like 192.0.2.128). Below we refer to it as <ip_address>.
Create a one-line text file named hosts using this command (with <ip_address> replaced):
echo "node1 ansible_host=<ip_address>" > hosts
node1 is a "host alias" (i.e. a made-up name) that you can use when referring to that host in Ansible. Move hosts to /etc/ansible/ because that's the default place where Ansible looks for it:
sudo mkdir -p /etc/ansible/
sudo mv hosts /etc/ansible/
Tell Ansible the Location of the SSH Key File
Ansible uses SSH to connect to the remote host, so it needs to know the location of the SSH (private) key file. (The corresponding public key should already be on the host you provisioned earler.) Normally, Ansible will ask for the location of the SSH key file as-needed. You can make it stop asking by putting the location in an Ansible configuration file (config file). (If you prefer, you could use ssh-agent instead.)
The following command will do that (overwriting any existing file named ansible.cfg):
# cd to the .../bigchaindb/ntools/one-m/ansible directory
echo "private_key_file=$HOME/.ssh/<key-name>" > ansible.cfg
where <key-name> must be replaced by the actual name of the SSH private key file.