openstack/vitrage
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vitrage/doc/source/contributor/nova-notifier.rst
Idan Hefetz a2ce45c3c6 Document version 3 template format 
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Change-Id: Ibed548118473902ed4bf7028aad854ebd1cb84bf
Story: 2004871
Task: 29128
2019-02-12 11:59:58 +00:00

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Vitrage Nova Notifier

Overview

The main purpose of Vitrage is to provide insights about the state of the system on problems that are not directly monitored. An example of such a problem is a switch failure that causes a Nova host to become unreachable, while Nova is not aware of this problem.

The Nova notifier tries to solve this use case, by calling Nova force-down API to notify Nova that the host is down.

Configuration

In order to support this use case, the user should perform the following:

  1. Activate the nova notifier. In /etc/vitrage/vitrage.conf:
[DEFAULT]
notifiers = nova
  1. Determine, in the Vitrage templates, what condition(s) indicates that the host is down. For example:
scenarios:
  - scenario:
    condition: host_down_alarm_on_host
      actions:
        action:
          action_type : mark_down
            action_target:
              target: host

For more information about the mark-down action, see the Vitrage templates documentation: templates