Scenario 2: One service at a time

In this scenario, you upgrade one service at a time.

The procedure for upgrading an OpenStack service generally looks something like:

  1. Stop the service:

      # openstack-service stop <service>

  2. Upgrade the packages that provide that service:

      # yum upgrade \*<service>\*

  3. Update the database schema for that service:

      # openstack-db --service <service> --update

    See the [Database Upgrades][dbsync] document for the specific command used by each individual service to perform the database schema upgrade.

  4. Restart the service:

      # openstack-service start <service>

Pre-upgrade

On all of your hosts:

  1. Install the Havana yum repository.

Service upgrades

Upgrade each of your services. The following is a reasonable order in which to perform the upgrade:

  1. Keystone
  2. Swift
  3. Cinder
  4. Glance
  5. Neutron (only if you are using Neutron networking in your Havana environment)
  6. Horizon
  7. Nova

After you have upgraded each service, you should test to make sure that the service is functioning properly. You will also want to review any new (*.rpmnew) configuration files installed by the upgraded package.

Post-upgrade

You will want to perform a final package upgrade to ensure that all your installed packages are at the latest version.