17 - Installing OpenStack using kolla-ansible on virtual machines

Up to now we installed OpenStack manually, configuring each step one by one. Now we jump to automation with Ansible, which lets you run deployments with almost no human intervention. The idea is simple: define your settings in a few files and Ansible runs the whole process unattended. These files can be versioned in Git so you can repeat or tweak deployments later. Ansible simplifies OpenStack by concentrating most settings in a handful of files with sensible defaults, valid for both simple environments and more complex ones (multi-node, clustering, advanced networking, etc.).