# 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

2. Determine, in the Vitrage templates, what condition(s) indicates that the host is down. For example:

    scenarios:
      - condition: host_down_alarm [on] host
        actions:
          - mark_down:
              target: host

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

this page last updated: 2026-01-23 22:59:33

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