Customizing Zero-Downtime Upgrades

You can customize zero-downtime upgrades using the user-action framework of Fleet Patching and Provisioning.

To use the user-action framework, you can provide a separate script for any or all of the points listed in the overall process.

Table 5-1 Zero-Downtime Upgrade Plugins

Plugin Type	Pre or Post	Plugin runs...
ZDTUPGRADE_DATABASE	Pre	Before Fleet Patching and Provisioning starts zero-downtime upgrade.
	Post	After Fleet Patching and Provisioning completes zero-downtime upgrade.
ZDTUPGRADE_DATABASE_SNAPDB	Pre	Before creating the snapshot or full-clone database.
	Post	After starting the snapshot or full-clone database (but before switching over).
ZDTUPGRADE_DATABASE_DBUA	Pre	Before running DBUA (after switching over).
	Post	After DBUA completes.
ZDTUPGRADE_DATABASE_SWITCHBACK	Pre	Before switching back users to the upgraded source database.
	Post	After switching back users to the upgraded source database (before deleting snapshot or full-clone database).

• To register a plugin to be run during a zero-downtime upgrade, run the following command:

  $ rhpctl add useraction -useraction user_action_name -actionscript script_name
    {-pre | -post} -optype {ZDTUPGRADE_DATABASE | ZDTUPGRADE_DATABASE_SNAPDB |
     ZDTUPGRADE_DATABASE_DBUA | ZDTUPGRADE_DATABASE_SWITCHBACK}

  You can specify run-time input to the plugins using the -useractiondata option of the rhpctl zdtupgrade database command.