Masakari service overview

Masakari provides a Virtual Machines High Availability(VMHA), and rescues a KVM-based Virtual Machines(VM) from a failure events of the following:

• VM process down - restart vm (use nova stop API, and nova start API).

  Libvirt events will be also emitted by other failures.

• Provisioning process down - restarts process, changes nova-compute service

  status to maintenance mode (use nova service-disable).

• nova-compute host failure - evacuate all the VMs from failure host to

  reserved host (use nova evacuate API).

The service enables deployers to integrate with the Masakari service directly or through custom plug-ins.

The Masakari service consists of the following components:

masakari-api

An OpenStack-native REST API that processes API requests by sending them to the masakari-engine over Remote Procedure Call (RPC).

masakari-engine

Processes the notifications recevied from masakari-api by execcuting the recovery workflow in asynchronus way.