upgrade-2.md

Scenario 2: One service at a time (non-HA version)

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

Pre-upgrade

Perform the necessary pre-upgrade steps.

Service upgrades

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

1. Keystone
2. Cinder
3. Glance
4. Cinder
5. Heat
6. Ceilometer
7. Nova
8. Neutron
9. Horizon

The procedure for upgrading an individual OpenStack service looks like this:

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

4. Restart the service:

     # openstack-service start <service>
   

Some of the above services need additional steps beyond the standard process described above; follow the links in the list of services to see these instructions.

Post-upgrade

Perform the necessary post-upgrade steps.