Your OpenMetal private cloud is comprised of OpenStack services, which like the applications and services you might deploy inside of it, should be backed up on a regular interval so you can recover from catastrophic events. In this guide, we explain how to copy your cloud's configuration files and OpenStack service databases as well as how to restore these items.
Before Proceeding with this Guide
This guide introduces potentially harmful commands and actions that could cause the cloud to become inoperable or be in an unexpected state. Read commands carefully before executing them.
Kolla Ansible and Ceph Ansible
Kolla Ansible is responsible for deploying a Private Cloud's OpenStack services. Ceph Ansible then handles deployment of the cloud's Ceph cluster. These two systems deploy all OpenStack and Ceph services required for a Private Cloud, including their configurations.
Prepare Kolla Ansible and Ceph Ansible Environment
Before working with either Kolla Ansible or Ceph Ansible, you must prepare an environment in your shell:
Where are my Private Cloud's Configuration Files?
When a cloud finishes deploying, the Ansible configurations used to
deploy the cloud are exported into each of the control plane nodes
within the folders
/etc/kolla. This section
explains where configuration files are located and their purpose.
Kolla Ansible Configuration Files
The information in these files was used to deploy your Private Cloud's core OpenStack services into Docker containers:
- Kolla Ansible Inventory:
- Kolla Ansible Main Configuration:
Ceph Ansible Configuration Files
The information in these files was used to deploy your Private Cloud's Ceph cluster:
- Ceph Ansible Inventory:
- Ceph Ansible Main Configuration:
FM-Deploy Configuration File
FM-Deploy is a part of the system used to deploy your Private Cloud.
Information about this deployment system is provided for the sake of
completely explaining the configuration files found within
- FM-Deploy Main Configuration:
Network Ansible Configuration File
The following defines the initial networking configuration for your Private Cloud. This file was used upon initial cloud deployment.
Keep a Backup Copy a Private Cloud's Configuration Files
In case something unexpected happens to these files, you should keep
copies of them off site. To preserve the configuration of OpenStack
services and Ceph, copy the directories
/etc/ceph somewhere outside of the cloud, in a secure, private
location. These folders contain sensitive information about your cloud
so the information within should only be accessible to those you trust
How to Restore a Private Cloud's Configuration Files
There are two primary ways a Private Cloud's configuration file can be restored: Copy a known good configuration file from an off site location or use Ansible. This section explains how you can use Kolla Ansible and Ceph Ansible to recover a Private Cloud's configuration files.
Example: Recover Neutron's Configuration File using Kolla Ansible
For example, consider an event where one of your control plane nodes loses its Neutron server configuration file. This section explains how to recover this configuration by using Kolla Ansible.
Prerequisite: Prepare a Kolla Ansible Environment
Before proceeding, a Kolla Ansible environment needs to be prepared. For information about preparing a Kolla Ansible environment, see How to Prepare and Use Kolla Ansible Once the environment is prepared, navigate back to this section.
Regenerate an OpenStack Service's Configuration File using Kolla Ansible
In this example, we outline restoring the Neutron server configuration
file for the control plane node
In the Kolla Ansible inventory file,
/etc/fm-deploy/kolla-ansible-inventory, the following hosts are
defined as control plane nodes under the heading
To restore the Neutron server configuration file for
first ensure you have prepared a Kolla Ansible environment
Next, use Kolla Ansible's
reconfigure function, targeting only the
Neutron service by using the flag
--tags neutron and limit the run to
relaxed-flamingo by specifying the flag
-i /etc/fm-deploy/kolla-ansible-inventory \
--tags neutron \