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Details of K2HR3 OpenStack Notification Listener

This page describes how K2HR3 OpenStack Notification Listener works in detail.

K2HR3 OpenStack Notification Listener is a daemon process to synchronize the OpenStack ‘instance’ metadata between OpenStack and K2HR3. To catch a new notification, it listens to a queue in a messaging backend where messages sent by OpenStack services are delivered.

K2HR3 OSNL overview

OpenStack Notification Listener

This chapter describes the OpenStack Notification Listener behavior.

OpenStack Notification Listener listens to notification messages from OpenStack services. However, OpenStack services, notifiers, don’t directly send notification messages to OpenStack Notification Listener. Here is the general delivery flow of notification messages from notifiers to listeners.

K2HR3 OpenStack Notification Listener

This chapter describes the ‘K2HR3 OpenStack Notification Listener’ behavior.

K2HR3 OpenStack Notification Listener is a plugin of OpenStack Notification Listener. The following figure shows the overview of the plugin, which describes that:

K2HR3 OSNL details

Here are the primary settings parameters to control the plugin’s behavior.

To know how to configure the plugin, see the Environments and Settings page.

To parse messages and find enough information to call the K2HR3’s [Role API](api_role.html], the values of the ‘topic’ and the ‘exchange’ must be configured with the same with notifiers target destination settings. See the Environments and Settings page for the plugin settings.

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