Host Maintenance Strategy

updated: 2019-02-13 12:00

Host Maintenance Strategy¶

Synopsis¶

display name: Host Maintenance Strategy

goal: cluster_maintaining

Requirements¶

None.

Metrics¶

None

Cluster data model¶

Default Watcher’s Compute cluster data model:

Actions¶

Default Watcher’s actions:

action description

migration

change_nova_service_state

action	description
`migration`
`change_nova_service_state`

Planner¶

Default Watcher’s planner:

Weight planner implementation

This implementation builds actions with parents in accordance with weights. Set of actions having a higher weight will be scheduled before the other ones. There are two config options to configure: action_weights and parallelization.

Limitations

This planner requires to have action_weights and parallelization configs tuned well.

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¶