masakari-instancemonitor¶
Monitor Overview¶
The masakari-instancemonitor provides Virtual Machine High Availability for OpenStack clouds by automatically detecting VMs domain events via libvirt. If it detects specific libvirt events, it sends notifications to the masakari-api.
How does it work?¶
It runs libvirt event loop in a background thread.
Invoking libvirt.virEventRegisterDefaultImpl() will register libvirt’s default event loop implementation.
Invoking libvirt.virEventRunDefaultImpl() will perform one iteration of the libvirt default event loop.
Invoking conn.domainEventRegisterAny() will register event callbacks against libvirt connection instances. The callbacks registered will be triggered from the execution context of libvirt.virEventRunDefaultImpl(), which will send notifications to the masakari-api.
It will reconnect to libvirt and reprocess if disconnected.
