Node Resource Consolidation Strategy

Synopsis

display name: Node Resource Consolidation Strategy

goal: Server Consolidation

Requirements

None.

Metrics

None

Cluster data model

Default Watcher’s Compute cluster data model:

Actions

Default Watcher’s actions:

action

description

migration

Migrates a server to a destination nova-compute host

This action will allow you to migrate a server to another compute destination host. Migration type ‘live’ can only be used for migrating active VMs. Migration type ‘cold’ can be used for migrating non-active VMs as well active VMs, which will be shut down while migrating.

The action schema is:

schema = Schema({
 'resource_id': str,  # should be a UUID
 'migration_type': str,  # choices -> "live", "cold"
 'destination_node': str,
 'source_node': str,
})

The resource_id is the UUID of the server to migrate. The source_node and destination_node parameters are respectively the source and the destination compute hostname (list of available compute hosts is returned by this command: nova service-list --binary nova-compute).

Note

Nova API version must be 2.56 or above if destination_node parameter is given.

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

host_choice

String

The way to select the server migration destination node, The value auto means that Nova schedular selects the destination node, and specify means the strategy specifies the destination.

Efficacy Indicator

None

Algorithm

For more information on the Node Resource Consolidation Strategy please refer to: https://specs.openstack.org/openstack/watcher-specs/specs/train/approved/node-resource-consolidation.html

How to use it ?

$ openstack optimize audittemplate create \
  at1 server_consolidation \
  --strategy node_resource_consolidation

$ openstack optimize audit create \
  -a at1 -p host_choice=auto