Overview

OpenStack-Ansible supports deploying an OpenStack cloud configured to use an existing Ceph storage cluster, however it does not support the actual deployment of the Ceph cluster it consumes.

This guide explains how to integrate the ceph-ansible playbooks with OpenStack-Ansible to manage and deploy both systems together as a single unit.

Prerequisite

This guide will use the Openstack-Ansible Overlay framework as the basis for integrating the two projects.

Quick Start

I have prepared a sample branch using the Overlay to add ceph-ansible to the OpenStack-Ansible deployment.

To get started with the sample branch, build an AIO as follows:

# First clone the overlay repository
# The --recursive option will initialize the openstack-ansible submodule
# inside the repository.
git clone -b ceph --recursive https://github.com/Logan2211/openstack-ansible-overlay
cd openstack-ansible-overlay

# Update the submodule to the HEAD of the openstack-ansible master branch
git submodule update --remote

# Run the deployment to build the AIO
# UPDATE_ANSIBLE is used to run the bootstrap-ansible.sh script included with OpenStack-Ansible
# DEPLOY_AIO triggers the AIO bootstrap role
sudo UPDATE_ANSIBLE=true DEPLOY_AIO=true scripts/deploy.sh

Once the AIO has finished building, you will have an environment which is configured to use Ceph along with a working Ceph cluster inside the AIO.

How it works

Integrating the ceph-ansible playbooks into the OpenStack-Ansible Overlay configuration involves several configuration files.

  • ansible-role-requirements.yml: Used to clone the ceph-ansible roles into /etc/ansible/roles
  • overlay/env/env.d/ceph.yml: Impelments the ceph-mon and ceph-osd containers and groups.
  • overlay/env/openstack_deploy/user_ceph.yml: The baseline configuration required to run the ceph-ansible roles.
  • overlay/env/openstack_deploy/user_settings.yml: Configuration used to make OpenStack-Ansible use our Ceph cluster.
  • overlay/local/openstack_deploy/user_ceph.yml: Automatically created when deploying an AIO using the example repo, this file will contain settings to bootstrap the Ceph cluster inside the AIO.
  • overlay/playbooks/ceph-install.yml: Playbook used to run the ceph-ansible roles.
  • scripts/deploy.sh: It executes the playbooks in a similar fashion to OpenStack-Ansible‚Äôs run-playbooks.sh, however in this case it runs the ceph-install.yml playbook at the appropriate time during the OpenStack-Ansible deployment process.

AIO Ceph Architecture

The AIO build included in the example repo will configure a single ceph-mon container along with 3 OSDs on the host. The OSDs are provisioned using loopback devices that can be found at /openstack/ceph{1,2,3}.img.

Further Customization

For more detailed information about this example configuration, please review the branch implementing the Ceph integration at Github.

The build can be further customized by following the instructions for Overlay customizations. ceph-ansible offers a variety of configuration options, which are outlined in the group_vars sample files.