openstack/openstack-ansible
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About OpenStack-Ansible

OpenStack-Ansible (OSA) uses the Ansible IT automation engine to deploy an OpenStack environment on Ubuntu Linux. For isolation and ease of maintenance, you can install OpenStack components into Linux containers (LXC).

This documentation is intended for deployers, and walks through an OpenStack-Ansible installation for a test environment and production environment.

Ansible

Ansible provides an automation platform to simplify system and application deployment. Ansible manages systems using Secure Shell (SSH) instead of unique protocols that require remote daemons or agents.

Ansible uses playbooks written in the YAML language for orchestration. For more information, see Ansible - Intro to Playbooks.

In this guide, we refer to two types of hosts:

  • Deployment host - The host running Ansible playbooks.
  • Target hosts - The hosts where Ansible installs OpenStack services and infrastructure components.

Linux containers (LXC)

Containers provide operating-system level virtualization by enhancing the concept of chroot environments. These isolate resources and file systems for a particular group of processes without the overhead and complexity of virtual machines. They access the same kernel, devices, and file systems on the underlying host and provide a thin operational layer built around a set of rules.

The LXC project implements operating system level virtualization on Linux using kernel namespaces and includes the following features:

  • Resource isolation including CPU, memory, block I/O, and network using cgroups.
  • Selective connectivity to physical and virtual network devices on the underlying physical host.
  • Support for a variety of backing stores including LVM.
  • Built on a foundation of stable Linux technologies with an active development and support community.

Installation workflow

This diagram shows the general workflow associated with an OpenStack-Ansible installation.

  1. deployment-host
  2. target-hosts
  3. configure
  4. run-playbooks
  5. verify-operation