Add documentation about saving energy strategy

Change-Id: I9746239c83ea7bff364ad6939e4174748be2d299 Closes-Bug: #1713402
2017-09-06 18:27:24 +08:00 · 2017-09-06 18:27:24 +08:00 · cf8d7bb2f4
commit cf8d7bb2f4
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--- a/doc/source/strategies/saving_energy.rst
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+======================
+Saving Energy Strategy
+======================
+
+Synopsis
+--------
+
+**display name**: ``Saving Energy Strategy``
+
+**goal**: ``saving_energy``
+
+    .. watcher-term:: watcher.decision_engine.strategy.strategies.saving_energy
+
+Requirements
+------------
+
+This feature will use Ironic to do the power on/off actions, therefore
+this feature requires that the ironic component is configured.
+And the compute node should be managed by Ironic.
+
+Ironic installation: https://docs.openstack.org/ironic/latest/install/index.html
+
+Cluster data model
+******************
+
+Default Watcher's Compute cluster data model:
+
+    .. watcher-term:: watcher.decision_engine.model.collector.nova.NovaClusterDataModelCollector
+
+Actions
+*******
+
+    .. list-table::
+       :widths: 30 30
+       :header-rows: 1
+
+       * - action
+         - description
+       * - ``change_node_power_state``
+         - .. watcher-term:: watcher.applier.actions.change_node_power_state.ChangeNodePowerState
+
+Planner
+*******
+
+Default Watcher's planner:
+
+    .. watcher-term:: watcher.decision_engine.planner.weight.WeightPlanner
+
+
+Configuration
+-------------
+
+Strategy parameter is:
+
+====================== ====== ======= ======================================
+parameter              type   default          description
+                              Value
+====================== ====== ======= ======================================
+``free_used_percent``  Number  10.0   a rational number, which describes the
+                                      the quotient of
+                                      min_free_hosts_num/nodes_with_VMs_num
+``min_free_hosts_num`` Int      1     an int number describes minimum free
+                                      compute nodes
+====================== ====== ======= ======================================
+
+
+Efficacy Indicator
+------------------
+
+Energy saving strategy efficacy indicator is unclassified.
+https://github.com/openstack/watcher/blob/master/watcher/decision_engine/goal/goals.py#L215-L218
+
+Algorithm
+---------
+
+For more information on the Energy Saving Strategy please refer to:http://specs.openstack.org/openstack/watcher-specs/specs/pike/implemented/energy-saving-strategy.html
+
+How to use it ?
+---------------
+step1: Add compute nodes info into ironic node management
+
+.. code-block:: shell
+
+    $ ironic node-create  -d pxe_ipmitool -i ipmi_address=10.43.200.184 \
+      ipmi_username=root  -i ipmi_password=nomoresecret -e compute_node_id=3
+
+step 2: Create audit to do optimization
+
+.. code-block:: shell
+
+    $ openstack optimize audittemplate create \
+      at1 saving_energy --strategy saving_energy
+
+    $ openstack optimize audit create -a at1
+
+External Links
+--------------
+
+*Spec URL*
+http://specs.openstack.org/openstack/watcher-specs/specs/pike/implemented/energy-saving-strategy.html