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Chapter 1. Introduction
This document provides a workflow to help upgrade your Red Hat OpenStack Platform environment to the latest major version and keep it updated with minor releases of that version.
This guide provides an upgrade path through the following versions:
| Old Overcloud Version | New Overcloud Version |
|---|---|
| Red Hat OpenStack Platform 13 | Red Hat OpenStack Platform 14 |
1.1. High level workflow
The following table provides an outline of the steps required for the upgrade process:
| Step | Description |
|---|---|
| Preparing your environment | Perform a backup of the database and configuration of the undercloud and overcloud Controller nodes. Update to the latest minor release. Validate the environment. |
| Preparing container images | Create an environment file containing the parameters to prepare container images for OpenStack Platform 14 services. |
| Upgrading the undercloud | Upgrade the undercloud from OpenStack Platform 13 to OpenStack Platform 14. |
| Preparing the overcloud | Perform relevant steps to transition your overcloud configuration files to OpenStack Platform 14. |
| Upgrading your Controller nodes | Upgrade all Controller nodes simultaneously to OpenStack Platform 14. |
| Upgrading your Compute nodes | Test the upgrade on selected Compute nodes. If the test succeeds, upgrade all Compute nodes. |
| Upgrading your Ceph Storage nodes | Upgrade all Ceph Storage nodes. This includes an upgrade to containerized version of Red Hat Ceph Storage 3. |
| Finalize the upgrade | Run the convergence command to refresh your overcloud stack. |
1.2. Major changes
The following is a high-level list of major changes that occur during the upgrade.
- The undercloud now uses containers to run services. The undercloud also uses the same architecture that configures the overcloud.
- The director now uses a container preparation method to automatically obtain container images for the undercloud and overcloud.
-
The overcloud now uses an Ansible-based Red Hat Subscription Management method. This replaces the previous
rhel-registrationmethod. - Composable networks now define a list of routes.
- The Telemetry API service is replaced by the OpenStack Telemetry Metrics (gnocchi) service and the OpenStack Telemetry Alarming (aodh) service APIs. The ceilometer-collector service is replaced by the ceilometer-notification-agent daemon. OpenStack Telemetry (ceilometer) as a whole has not been removed from OpenStack Platform 14.
1.3. Before starting the upgrade
Apply any firmware updates to your hardware before performing the upgrade.
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