watcher/doc/source/strategies/host_maintenance.rst

Host Maintenance Strategy

Synopsis

display name: Host Maintenance Strategy

goal: cluster_maintaining

watcher.decision_engine.strategy.strategies.host_maintenance.HostMaintenance

Requirements

None.

Metrics

None

Cluster data model

Default Watcher's Compute cluster data model:

watcher.decision_engine.model.collector.nova.NovaClusterDataModelCollector

Actions

Default Watcher's actions:

action	description
migration	watcher.applier.actions.migration.Migrate
change_nova_service_state	watcher.applier.actions.change_nova_service_state.ChangeNovaServiceState

Planner

Default Watcher's planner:

watcher.decision_engine.planner.weight.WeightPlanner

Configuration

Strategy parameters are:

parameter	type	default Value description
maintenance_node	String	The name of the compute node which need maintenance. Required.
backup_node	String	The name of the compute node which will backup the maintenance node. Optional.

Efficacy Indicator

None

Algorithm

For more information on the Host Maintenance Strategy please refer to: https://specs.openstack.org/openstack/watcher-specs/specs/queens/approved/cluster-maintenance-strategy.html

How to use it ?

$ openstack optimize audit create \
  -g cluster_maintaining -s host_maintenance \
  -p maintenance_node=compute01 \
  -p backup_node=compute02 \
  --auto-trigger

External Links

None.