==================================
Basic Offline Server Consolidation
==================================

Synopsis
--------

**display name**: ``basic``

**goal**: ``server_consolidation``

    .. watcher-term:: watcher.decision_engine.strategy.strategies.basic_consolidation

Requirements
------------

Metrics
*******

The *basic* strategy requires the following metrics:

============================ ============ ======= =======
metric                       service name plugins comment
============================ ============ ======= =======
``compute.node.cpu.percent`` ceilometer_  none
``cpu_util``                 ceilometer_  none
============================ ============ ======= =======

.. _ceilometer: http://docs.openstack.org/admin-guide/telemetry-measurements.html#openstack-compute

Cluster data model
******************

Default Watcher's Compute cluster data model:

    .. watcher-term:: watcher.decision_engine.model.collector.nova.NovaClusterDataModelCollector

Actions
*******

Default Watcher's actions:


    .. list-table::
       :widths: 30 30
       :header-rows: 1

       * - action
         - description
       * - ``migration``
         - .. watcher-term:: watcher.applier.actions.migration.Migrate
       * - ``change_nova_service_state``
         - .. watcher-term:: watcher.applier.actions.change_nova_service_state.ChangeNovaServiceState

Planner
*******

Default Watcher's planner:

    .. watcher-term:: watcher.decision_engine.planner.default.DefaultPlanner

Configuration
-------------

Strategy parameter is:

====================== ====== ============= ===================================
parameter              type   default Value description
====================== ====== ============= ===================================
``migration_attempts`` Number 0             Maximum number of combinations to
                                            be tried by the strategy while
                                            searching for potential candidates.
                                            To remove the limit, set it to 0
====================== ====== ============= ===================================

Efficacy Indicator
------------------

.. watcher-func::
  :format: literal_block

  watcher.decision_engine.goal.efficacy.specs.ServerConsolidation.get_global_efficacy_indicator

How to use it ?
---------------

.. code-block:: shell

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

    $ openstack optimize audit create -a at1 -p migration_attempts=4

External Links
--------------
None.