Update the usage of unscoped extra specs
Although the unscoped extra specs are supported in AggregateInstanceExtraSpecsFilter and ComputeCapabilitiesFilter, it should be not encouraged, since it will cause conflict. Closes-Bug: 1330962 Change-Id: I2b35bf85f0c2e8c8c386bf0c4bed1e6c21cea453
This commit is contained in:
Yunhong Jiang
parent
38ae296fd0
commit
7e7cb4d0ec
@ -6,30 +6,30 @@
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<section xml:id="section_compute-scheduler"
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xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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version="5.0">
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xmlns:xi="http://www.w3.org/2001/XInclude" version="5.0">
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<?dbhtml stop-chunking?>
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<title>Scheduling</title>
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<para>Compute uses the <systemitem class="service"
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>nova-scheduler</systemitem> service to determine how to
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dispatch compute and volume requests. For example, the
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<systemitem class="service">nova-scheduler</systemitem>
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service determines which host a VM should launch on. The term
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<firstterm>host</firstterm> in the context of filters
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means a physical node that has a <systemitem class="service"
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service determines on which host a VM should launch. In the
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context of filters, the term <firstterm>host</firstterm> means
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a physical node that has a <systemitem class="service"
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>nova-compute</systemitem> service running on it. You can
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configure the scheduler through a variety of options.</para>
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<para>Compute is configured with the following default scheduler options in the
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<filename>/etc/nova/nova.conf</filename> file:</para>
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<para>Compute is configured with the following default scheduler
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options in the <filename>/etc/nova/nova.conf</filename>
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file:</para>
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<programlisting language="ini">scheduler_driver=nova.scheduler.multi.MultiScheduler
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scheduler_driver_task_period=60
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compute_scheduler_driver=nova.scheduler.filter_scheduler.FilterScheduler
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scheduler_available_filters=nova.scheduler.filters.all_filters
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scheduler_default_filters=RetryFilter,AvailabilityZoneFilter,RamFilter,ComputeFilter,ComputeCapabilitiesFilter,ImagePropertiesFilter,ServerGroupAntiAffinityFilter,ServerGroupAffinityFilter</programlisting>
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<para>By default, the scheduler_driver is configured as a filter
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scheduler, as described in the next section. In the default
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configuration, this scheduler considers hosts that meet all
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the following criteria:</para>
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<para>By default, the <parameter>scheduler_driver</parameter> is
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configured as a filter scheduler, as described in the next
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section. In the default configuration, this scheduler
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considers hosts that meet all the following criteria:</para>
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<itemizedlist>
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<listitem>
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<para>Have not been attempted for scheduling purposes
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@ -44,7 +44,7 @@ scheduler_default_filters=RetryFilter,AvailabilityZoneFilter,RamFilter,ComputeFi
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(<literal>RamFilter</literal>).</para>
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</listitem>
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<listitem>
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<para>Capable of servicing the request
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<para>Can service the request
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(<literal>ComputeFilter</literal>).</para>
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</listitem>
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<listitem>
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@ -59,30 +59,31 @@ scheduler_default_filters=RetryFilter,AvailabilityZoneFilter,RamFilter,ComputeFi
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(<literal>ImagePropertiesFilter</literal>).</para>
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</listitem>
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</itemizedlist>
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<para>The scheduler caches its list of available hosts; you can
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specify how often the list is updated by modifying the
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<option>scheduler_driver_task_period</option> value.
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</para>
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<para>The scheduler caches its list of available hosts; use the
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<option>scheduler_driver_task_period</option> option to
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specify how often the list is updated.</para>
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<note>
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<para>Do not configure <option>service_down_time</option> to be
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much smaller than <option>scheduler_driver_task_period</option>;
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otherwise, hosts will appear to be dead while the host list is
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<para>Do not configure <option>service_down_time</option> to
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be much smaller than
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<option>scheduler_driver_task_period</option>;
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otherwise, hosts appear to be dead while the host list is
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being cached.</para>
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</note>
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<para>For information on the volume scheduler, refer the Block
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<para>For information about the volume scheduler, see the Block
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Storage section of <link
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xlink:href="http://docs.openstack.org/admin-guide-cloud/content/managing-volumes.html">
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<citetitle>OpenStack Cloud Administrator
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Guide</citetitle></link> for information.</para>
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<para>The choice of a new host on instance migration is done by the
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scheduler.</para>
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<para>When evacuating instances from a host, the scheduler service does not
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pick the next host. Instances are evacuated to the host explicitly
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defined by the administrator. For information about instance evacuation,
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refer to the <link
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xlink:href="http://docs.openstack.org/admin-guide-cloud/content/nova_cli_evacuate.html">Evacuate
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instances</link> section of the <citetitle>Cloud Administrator Guide</citetitle>.</para>
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Guide</citetitle></link>.</para>
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<para>The scheduler chooses a new host when an instance is
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migrated.</para>
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<para>When evacuating instances from a host, the scheduler service
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does not pick the next host. Instances are evacuated to the
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host explicitly defined by the administrator. For information
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about instance evacuation, see <link
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xlink:href="http://docs.openstack.org/admin-guide-cloud/content/nova_cli_evacuate.html"
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>Evacuate instances</link> section of the
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<citetitle>OpenStack Cloud Administrator
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Guide</citetitle>.</para>
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<section xml:id="filter-scheduler">
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<title>Filter scheduler</title>
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<para>The Filter Scheduler
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@ -102,7 +103,7 @@ scheduler_default_filters=RetryFilter,AvailabilityZoneFilter,RamFilter,ComputeFi
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the filter, or it is rejected. Hosts that are accepted by
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the filter are then processed by a different algorithm to
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decide which hosts to use for that request, described in
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the <link linkend="weights">Weights</link> section.
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the <link linkend="weights">Weights</link> section.</para>
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<figure xml:id="filter-figure">
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<title>Filtering</title>
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<mediaobject>
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@ -113,7 +114,6 @@ scheduler_default_filters=RetryFilter,AvailabilityZoneFilter,RamFilter,ComputeFi
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</imageobject>
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</mediaobject>
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</figure>
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</para>
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<para>The <option>scheduler_available_filters</option>
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configuration option in <filename>nova.conf</filename>
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provides the Compute service with the list of the filters
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@ -130,10 +130,12 @@ scheduler_default_filters=RetryFilter,AvailabilityZoneFilter,RamFilter,ComputeFi
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contain:</para>
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<programlisting language="ini">scheduler_available_filters=nova.scheduler.filters.all_filters
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scheduler_available_filters=myfilter.MyFilter</programlisting>
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<para>The <literal>scheduler_default_filters</literal> configuration option in
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<filename>nova.conf</filename> defines the list of filters that are applied by the
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<systemitem class="service">nova-scheduler</systemitem> service. The default filters
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are:</para>
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<para>The <literal>scheduler_default_filters</literal>
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configuration option in <filename>nova.conf</filename>
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defines the list of filters that are applied by the
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<systemitem class="service"
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>nova-scheduler</systemitem> service. The default
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filters are:</para>
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<programlisting language="ini">scheduler_default_filters=RetryFilter,AvailabilityZoneFilter,RamFilter,ComputeFilter,ComputeCapabilitiesFilter,ImagePropertiesFilter,ServerGroupAntiAffinityFilter,ServerGroupAffinityFilter</programlisting>
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<para>The following sections describe the available
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filters.</para>
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@ -147,32 +149,34 @@ scheduler_available_filters=myfilter.MyFilter</programlisting>
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</section>
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<section xml:id="aggregateimagepropertiesisolationfilter">
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<title>AggregateImagePropertiesIsolation</title>
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<para>Matches properties defined in an image's metadata against those of aggregates to
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determine host matches:</para>
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<para>
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<para>Matches properties defined in an image's metadata
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against those of aggregates to determine host
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matches:</para>
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<itemizedlist>
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<listitem>
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<para>If a host belongs to an aggregate and the aggregate defines one or
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more metadata that matches an image's properties, that host is a candidate
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to boot the image's instance.</para>
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<para>If a host belongs to an aggregate and the
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aggregate defines one or more metadata that
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matches an image's properties, that host is a
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candidate to boot the image's instance.</para>
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</listitem>
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<listitem>
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<para>If a host does not belong to any aggregate, it can boot instances from
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all images.</para>
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<para>If a host does not belong to any aggregate,
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it can boot instances from all images.</para>
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</listitem>
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</itemizedlist>
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</para>
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<para>For example, the following aggregate <systemitem>myWinAgg</systemitem> has the
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Windows operating system as metadata (named 'windows'):</para>
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<para>For example, the following aggregate
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<systemitem>myWinAgg</systemitem> has the Windows
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operating system as metadata (named 'windows'):</para>
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<screen><prompt>$</prompt> <userinput>nova aggregate-details MyWinAgg</userinput>
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<computeroutput>+----+----------+-------------------+------------+---------------+
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| Id | Name | Availability Zone | Hosts | Metadata |
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+----+----------+-------------------+------------+---------------+
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| 1 | MyWinAgg | None | 'sf-devel' | 'os=windows' |
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+----+----------+-------------------+------------+---------------+</computeroutput></screen>
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<para>In this example, because the following Win-2012 image has the <property>windows</property>
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property, it would boot on the <systemitem>sf-devel</systemitem> host (all other
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filters being equal):</para>
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<para>In this example, because the following Win-2012
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image has the <property>windows</property> property,
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it boots on the <systemitem>sf-devel</systemitem> host
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(all other filters being equal):</para>
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<screen><prompt>$</prompt> <userinput>glance image-show Win-2012</userinput>
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<computeroutput>+------------------+--------------------------------------+
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| Property | Value |
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@ -182,10 +186,11 @@ scheduler_available_filters=myfilter.MyFilter</programlisting>
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| container_format | ami |
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| created_at | 2013-11-14T13:24:25 |
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| ...</computeroutput></screen>
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<para>You can configure the <systemitem>AggregateImagePropertiesIsolation</systemitem> filter using
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the following options in the <filename>nova.conf</filename> file:
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</para>
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<programlisting language="ini"># Considers only keys matching the given namespace (string).
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<para>You can configure the
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<systemitem>AggregateImagePropertiesIsolation</systemitem>
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filter by using the following options in the
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<filename>nova.conf</filename> file:</para>
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<programlisting language="ini"># Considers only keys matching the given namespace (string).
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aggregate_image_properties_isolation_namespace=<None>
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# Separator used between the namespace and keys (string).
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@ -193,25 +198,31 @@ aggregate_image_properties_isolation_separator=.</programlisting>
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</section>
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<section xml:id="aggregateinstanceextraspecsfilter">
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<title>AggregateInstanceExtraSpecsFilter</title>
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<para>Matches properties defined in an instance type's
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extra specs against admin-defined properties on a host
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aggregate. Works with specifications that are
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unscoped, or are scoped with
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<para>Matches properties defined in extra specs for an
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instance type against admin-defined properties on a
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host aggregate. Works with specifications that are
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scoped with
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<literal>aggregate_instance_extra_specs</literal>.
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See the <link linkend="host-aggregates">host
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aggregates</link> section for documentation on how
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to use this filter.</para>
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For backward compatibility, also works with non-scoped
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specifications; this action is highly discouraged
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because it conflicts with <link
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linkend="computecapabilitiesfilter">
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ComputeCapabilitiesFilter</link> filter when you
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enable both filters. For information about how to use
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this filter, see the <link linkend="host-aggregates"
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>host aggregates</link> section.</para>
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</section>
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<section xml:id="aggregate-multi-tenancy-isolation">
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<title>AggregateMultiTenancyIsolation</title>
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<para>Isolates tenants to specific <link
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linkend="host-aggregates">host aggregates</link>.
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If a host is in an aggregate that has the metadata key
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<literal>filter_tenant_id</literal> it only
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creates instances from that tenant (or list of
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tenants). A host can be in different aggregates. If a
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host does not belong to an aggregate with the metadata
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key, it can create instances from all tenants.</para>
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If a host is in an aggregate that has the
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<literal>filter_tenant_id</literal> metadata key,
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the host creates instances from only that tenant or
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list of tenants. A host can be in different
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aggregates. If a host does not belong to an aggregate
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with the metadata key, the host can create instances
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from all tenants.</para>
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</section>
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<section xml:id="aggregate-ram-filter">
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<title>AggregateRamFilter</title>
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@ -224,40 +235,46 @@ aggregate_image_properties_isolation_separator=.</programlisting>
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</section>
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<section xml:id="allhostsfilter">
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<title>AllHostsFilter</title>
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<para>This is a no-op filter, it does not eliminate any of
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<para>This is a no-op filter. It does not eliminate any of
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the available hosts.</para>
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</section>
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<section xml:id="availabilityzonefilter">
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<title>AvailabilityZoneFilter</title>
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<para>Filters hosts by availability zone. This filter must
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be enabled for the scheduler to respect availability
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<para>Filters hosts by availability zone. You must enable
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this filter for the scheduler to respect availability
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zones in requests.</para>
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</section>
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<section xml:id="computecapabilitiesfilter">
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<title>ComputeCapabilitiesFilter</title>
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<para>Matches properties defined in an instance type's
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extra specs against compute capabilities.</para>
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<para>If an extra specs key contains a colon ":", anything
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before the colon is treated as a namespace, and
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anything after the colon is treated as the key to be
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matched. If a namespace is present and is not
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'capabilities', it is ignored by this filter.</para>
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<para>Matches properties defined in extra specs for an
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instance type against compute capabilities.</para>
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<para>If an extra specs key contains a colon
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(<literal>:</literal>), anything before the colon
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is treated as a namespace and anything after the colon
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is treated as the key to be matched. If a namespace is
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present and is not <literal>capabilities</literal>,
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the filter ignores the namespace. For backward
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compatibility, also treats the extra specs key as the
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key to be matched if no namespace is present; this
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action is highly discouraged because it conflicts with
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<link linkend="aggregateinstanceextraspecsfilter">
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AggregateInstanceExtraSpecsFilter</link> filter
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when you enable both filters.</para>
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</section>
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<section xml:id="computefilter">
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<title>ComputeFilter</title>
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<para>Passes all hosts that are operational and
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enabled.</para>
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<para>In general, this filter should always be enabled.
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</para>
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<para>In general, you should always enable this filter.</para>
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</section>
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<section xml:id="corefilter">
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<title>CoreFilter</title>
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<para>Only schedules instances on hosts if there are
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sufficient CPU cores available. If this filter is not
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set, the scheduler may over-provision a host based on
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cores (for example, the virtual cores running on an
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instance may exceed the physical cores).</para>
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<para>This filter can be configured to allow a fixed
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<para>Only schedules instances on hosts if sufficient CPU
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cores are available. If this filter is not set, the
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scheduler might over-provision a host based on cores.
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For example, the virtual cores running on an instance
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may exceed the physical cores.</para>
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<para>You can configure this filter to enable a fixed
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amount of vCPU overcommitment by using the
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<option>cpu_allocation_ratio</option>
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Configuration option in
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@ -270,22 +287,23 @@ aggregate_image_properties_isolation_separator=.</programlisting>
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<para>To disallow vCPU overcommitment set:</para>
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<programlisting language="ini">cpu_allocation_ratio=1.0</programlisting>
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<note>
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<para>
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The Compute API will always return the actual number of CPU
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cores available on a compute node regardless of the value of
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the <option>cpu_allocation_ratio</option> configuration key. As
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a result changes to the <option>cpu_allocation_ratio</option>
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are not reflected via the command line clients or the
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dashboard. Changes to this configuration key are only taken
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into account internally in the scheduler.
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</para>
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<para>The Compute API always returns the actual
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number of CPU cores available on a compute node
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regardless of the value of the
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<option>cpu_allocation_ratio</option>
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configuration key. As a result changes to the
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<option>cpu_allocation_ratio</option> are not
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reflected via the command line clients or the
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dashboard. Changes to this configuration key are
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only taken into account internally in the
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scheduler.</para>
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</note>
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</section>
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<section xml:id="differenthostfilter">
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<title>DifferentHostFilter</title>
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<para>Schedules the instance on a different host from a set
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of instances. To take advantage of this filter, the
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requester must pass a scheduler hint, using
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<para>Schedules the instance on a different host from a
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set of instances. To take advantage of this filter,
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the requester must pass a scheduler hint, using
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<literal>different_host</literal> as the key and a
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list of instance uuids as the value. This filter is
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the opposite of the <literal>SameHostFilter</literal>.
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@ -305,7 +323,7 @@ aggregate_image_properties_isolation_separator=.</programlisting>
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<para>Only schedules instances on hosts if there is
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sufficient disk space available for root and ephemeral
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storage.</para>
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<para>This filter can be configured to allow a fixed
|
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<para>You can configure this filter to enable a fixed
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amount of disk overcommitment by using the
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<literal>disk_allocation_ratio</literal>
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Configuration option in
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@ -315,14 +333,16 @@ aggregate_image_properties_isolation_separator=.</programlisting>
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<para>Adjusting this value to greater than 1.0 enables
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scheduling instances while over committing disk
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resources on the node. This might be desirable if you
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use an image format that is sparse or copy on write
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so that each virtual instance does not require a 1:1
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use an image format that is sparse or copy on write so
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that each virtual instance does not require a 1:1
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allocation of virtual disk to physical storage.</para>
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</section>
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<section xml:id="groupaffinityfilter">
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<title>GroupAffinityFilter</title>
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<note><para>This filter is deprecated in favor of <link
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linkend="servergroupantiaffinityfilter">ServerGroupAffinityFilter</link>.</para>
|
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<note>
|
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<para>This filter is deprecated in favor of <link
|
||||
linkend="servergroupantiaffinityfilter"
|
||||
>ServerGroupAffinityFilter</link>.</para>
|
||||
</note>
|
||||
<para>The GroupAffinityFilter ensures that an instance is
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scheduled on to a host from a set of group hosts. To
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@ -333,15 +353,17 @@ aggregate_image_properties_isolation_separator=.</programlisting>
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<literal>--hint</literal> flag. For
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example:</para>
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<screen><prompt>$</prompt> <userinput>nova boot --image <replaceable>IMAGE_ID</replaceable> --flavor 1 --hint group=foo server-1</userinput></screen>
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<para>This filter should not be enabled at the same time as <link
|
||||
linkend="groupantiaffinityfilter">GroupAntiAffinityFilter</link>
|
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or neither filter will work properly.</para>
|
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<para>This filter should not be enabled at the same time
|
||||
as <link linkend="groupantiaffinityfilter"
|
||||
>GroupAntiAffinityFilter</link> or neither filter
|
||||
will work properly.</para>
|
||||
</section>
|
||||
<section xml:id="groupantiaffinityfilter">
|
||||
<title>GroupAntiAffinityFilter</title>
|
||||
<note><para>This filter is deprecated in favor of
|
||||
<link
|
||||
linkend="servergroupantiaffinityfilter">ServerGroupAntiAffinityFilter</link>.</para>
|
||||
<note>
|
||||
<para>This filter is deprecated in favor of <link
|
||||
linkend="servergroupantiaffinityfilter"
|
||||
>ServerGroupAntiAffinityFilter</link>.</para>
|
||||
</note>
|
||||
<para>The GroupAntiAffinityFilter ensures that each
|
||||
instance in a group is on a different host. To take
|
||||
@ -352,9 +374,10 @@ aggregate_image_properties_isolation_separator=.</programlisting>
|
||||
<literal>--hint</literal> flag. For
|
||||
example:</para>
|
||||
<screen><prompt>$</prompt> <userinput>nova boot --image <replaceable>IMAGE_ID</replaceable> --flavor 1 --hint group=foo server-1</userinput></screen>
|
||||
<para>This filter should not be enabled at the same time as <link
|
||||
linkend="groupaffinityfilter">GroupAffinityFilter</link> or
|
||||
neither filter will work properly.</para>
|
||||
<para>This filter should not be enabled at the same time
|
||||
as <link linkend="groupaffinityfilter"
|
||||
>GroupAffinityFilter</link> or neither filter will
|
||||
work properly.</para>
|
||||
</section>
|
||||
<section xml:id="imagepropertiesfilter">
|
||||
<title>ImagePropertiesFilter</title>
|
||||
@ -407,10 +430,9 @@ aggregate_image_properties_isolation_separator=.</programlisting>
|
||||
and hosts in the <filename>nova.conf</filename> file
|
||||
using the <literal>isolated_hosts</literal> and
|
||||
<literal>isolated_images</literal> configuration
|
||||
options. For example:
|
||||
options. For example:</para>
|
||||
<programlisting language="ini">isolated_hosts=server1,server2
|
||||
isolated_images=342b492c-128f-4a42-8d3a-c5088cf27d13,ebd267a6-ca86-4d6c-9a0e-bd132d6b7d09</programlisting>
|
||||
</para>
|
||||
</section>
|
||||
<section xml:id="jsonfilter">
|
||||
<title>JsonFilter</title>
|
||||
@ -476,14 +498,13 @@ isolated_images=342b492c-128f-4a42-8d3a-c5088cf27d13,ebd267a6-ca86-4d6c-9a0e-bd1
|
||||
the scheduler may over provision a host based on RAM
|
||||
(for example, the RAM allocated by virtual machine
|
||||
instances may exceed the physical RAM).</para>
|
||||
<para>This filter can be configured to allow a fixed
|
||||
<para>You can configure this filter to enable a fixed
|
||||
amount of RAM overcommitment by using the
|
||||
<literal>ram_allocation_ratio</literal>
|
||||
configuration option in
|
||||
<filename>nova.conf</filename>. The default setting
|
||||
is:</para>
|
||||
<programlisting
|
||||
language="ini">ram_allocation_ratio=1.5</programlisting>
|
||||
<programlisting language="ini">ram_allocation_ratio=1.5</programlisting>
|
||||
<para>This setting enables 1.5 GB instances to run on
|
||||
any compute node with 1 GB of free RAM.</para>
|
||||
</section>
|
||||
@ -520,12 +541,13 @@ isolated_images=342b492c-128f-4a42-8d3a-c5088cf27d13,ebd267a6-ca86-4d6c-9a0e-bd1
|
||||
</section>
|
||||
<section xml:id="servergroupaffinityfilter">
|
||||
<title>ServerGroupAffinityFilter</title>
|
||||
<para>The ServerGroupAffinityFilter ensures that an instance is
|
||||
scheduled on to a host from a set of group hosts. To
|
||||
take advantage of this filter, the requester must create a
|
||||
server group with an <literal>affinity</literal> policy, and
|
||||
pass a scheduler hint, using <literal>group</literal> as the key
|
||||
and the server group UUID as the value. Using the
|
||||
<para>The ServerGroupAffinityFilter ensures that an
|
||||
instance is scheduled on to a host from a set of group
|
||||
hosts. To take advantage of this filter, the requester
|
||||
must create a server group with an
|
||||
<literal>affinity</literal> policy, and pass a
|
||||
scheduler hint, using <literal>group</literal> as the
|
||||
key and the server group UUID as the value. Using the
|
||||
<command>nova</command> command-line tool, use the
|
||||
<literal>--hint</literal> flag. For
|
||||
example:</para>
|
||||
@ -534,11 +556,12 @@ isolated_images=342b492c-128f-4a42-8d3a-c5088cf27d13,ebd267a6-ca86-4d6c-9a0e-bd1
|
||||
</section>
|
||||
<section xml:id="servergroupantiaffinityfilter">
|
||||
<title>ServerGroupAntiAffinityFilter</title>
|
||||
<para>The ServerGroupAntiAffinityFilter ensures that each instance in
|
||||
a group is on a different host. To take advantage of this
|
||||
filter, the requester must create a server group with an
|
||||
<literal>anti-affinity</literal> policy, and pass a scheduler
|
||||
hint, using <literal>group</literal> as the key and the server
|
||||
<para>The ServerGroupAntiAffinityFilter ensures that each
|
||||
instance in a group is on a different host. To take
|
||||
advantage of this filter, the requester must create a
|
||||
server group with an <literal>anti-affinity</literal>
|
||||
policy, and pass a scheduler hint, using
|
||||
<literal>group</literal> as the key and the server
|
||||
group UUID as the value. Using the
|
||||
<command>nova</command> command-line tool, use the
|
||||
<literal>--hint</literal> flag. For
|
||||
@ -548,10 +571,10 @@ isolated_images=342b492c-128f-4a42-8d3a-c5088cf27d13,ebd267a6-ca86-4d6c-9a0e-bd1
|
||||
</section>
|
||||
<section xml:id="simplecidraffinityfilter">
|
||||
<title>SimpleCIDRAffinityFilter</title>
|
||||
<para>Schedules the instance based on host IP subnet range.
|
||||
To take advantage of this filter, the requester must
|
||||
specify a range of valid IP address in CIDR format, by
|
||||
passing two scheduler hints:</para>
|
||||
<para>Schedules the instance based on host IP subnet
|
||||
range. To take advantage of this filter, the requester
|
||||
must specify a range of valid IP address in CIDR
|
||||
format, by passing two scheduler hints:</para>
|
||||
<variablelist>
|
||||
<varlistentry>
|
||||
<term><literal>build_near_host_ip</literal></term>
|
||||
@ -584,26 +607,33 @@ isolated_images=342b492c-128f-4a42-8d3a-c5088cf27d13,ebd267a6-ca86-4d6c-9a0e-bd1
|
||||
<section xml:id="weights">
|
||||
<title>Weights</title>
|
||||
<?dbhtml stop-chunking?>
|
||||
<para>When resourcing instances, the Filter Scheduler filters and weighs each host in the
|
||||
list of acceptable hosts. Each time the scheduler selects a host, it virtually consumes
|
||||
resources on it, and subsequent selections are adjusted accordingly. This process is
|
||||
useful when the customer asks for the same large amount of instances, because weight is
|
||||
<para>When resourcing instances, the Filter Scheduler filters
|
||||
and weighs each host in the list of acceptable hosts. Each
|
||||
time the scheduler selects a host, it virtually consumes
|
||||
resources on it, and subsequent selections are adjusted
|
||||
accordingly. This process is useful when the customer asks
|
||||
for the same large amount of instances, because weight is
|
||||
computed for each requested instance.</para>
|
||||
<para>All weights are normalized before being summed up; the host with the largest weight is
|
||||
given the highest priority.</para>
|
||||
<para>All weights are normalized before being summed up; the
|
||||
host with the largest weight is given the highest
|
||||
priority.</para>
|
||||
<figure xml:id="figure_weighing-hosts">
|
||||
<title>Weighing hosts</title>
|
||||
<mediaobject>
|
||||
<imageobject>
|
||||
<imagedata fileref="../../common/figures/nova-weighting-hosts.png"/>
|
||||
<imagedata
|
||||
fileref="../../common/figures/nova-weighting-hosts.png"
|
||||
/>
|
||||
</imageobject>
|
||||
</mediaobject>
|
||||
</figure>
|
||||
<para>If cells are used, cells are weighted by the scheduler in the same manner as hosts.</para>
|
||||
<para>Hosts and cells are weighed based on the following options in the
|
||||
<filename>/etc/nova/nova.conf</filename> file:</para>
|
||||
<para>If cells are used, cells are weighted by the scheduler
|
||||
in the same manner as hosts.</para>
|
||||
<para>Hosts and cells are weighed based on the following
|
||||
options in the <filename>/etc/nova/nova.conf</filename>
|
||||
file:</para>
|
||||
<table rules="all" xml:id="table_host-weighting-options">
|
||||
<caption>Host Weighting options</caption>
|
||||
<caption>Host weighting options</caption>
|
||||
<col width="10%" title="Section"/>
|
||||
<col width="25%" title="Option"/>
|
||||
<col width="60%" title="Description"/>
|
||||
@ -618,58 +648,81 @@ isolated_images=342b492c-128f-4a42-8d3a-c5088cf27d13,ebd267a6-ca86-4d6c-9a0e-bd1
|
||||
<tr valign="top">
|
||||
<td>[DEFAULT]</td>
|
||||
<td><literal>ram_weight_multiplier</literal></td>
|
||||
<td>By default, the scheduler spreads instances across all hosts evenly. Set the
|
||||
<option>ram_weight_multiplier</option> option to
|
||||
a negative number if you prefer stacking instead of spreading. Use a
|
||||
<td>By default, the scheduler spreads instances
|
||||
across all hosts evenly. Set the
|
||||
<option>ram_weight_multiplier</option>
|
||||
option to a negative number if you prefer
|
||||
stacking instead of spreading. Use a
|
||||
floating-point value.</td>
|
||||
</tr>
|
||||
<tr valign="top">
|
||||
<td>[DEFAULT]</td>
|
||||
<td><literal>scheduler_host_subset_size</literal></td>
|
||||
<td>New instances are scheduled on a host that is chosen randomly from a subset
|
||||
of the N best hosts. This property defines the subset size from which a host
|
||||
is chosen. A value of 1 chooses the first host returned by the weighing
|
||||
functions.This value must be at least 1. A value less than 1 is ignored, and
|
||||
1 is used instead. Use an integer value.</td>
|
||||
<td>New instances are scheduled on a host that is
|
||||
chosen randomly from a subset of the N best
|
||||
hosts. This property defines the subset size
|
||||
from which a host is chosen. A value of 1
|
||||
chooses the first host returned by the
|
||||
weighing functions. This value must be at
|
||||
least 1. A value less than 1 is ignored, and 1
|
||||
is used instead. Use an integer value.</td>
|
||||
</tr>
|
||||
<tr valign="top">
|
||||
<td>[DEFAULT]</td>
|
||||
<td><literal>scheduler_weight_classes</literal></td>
|
||||
<td>Defaults to <literal>nova.scheduler.weights.all_weighers</literal>, which
|
||||
selects the only available weigher, the RamWeigher. Hosts are then weighed
|
||||
and sorted with the largest weight winning.</td>
|
||||
<td>Defaults to
|
||||
<literal>nova.scheduler.weights.all_weighers</literal>,
|
||||
which selects the only available weigher, the
|
||||
RamWeigher. Hosts are then weighed and sorted
|
||||
with the largest weight winning.</td>
|
||||
</tr>
|
||||
<tr valign="top">
|
||||
<td>[metrics]</td>
|
||||
<td><literal>weight_multiplier</literal></td>
|
||||
<td>Multiplier for weighing metrices. Use a floating-point value.</td>
|
||||
<td>Multiplier for weighing metrics. Use a
|
||||
floating-point value.</td>
|
||||
</tr>
|
||||
<tr valign="top">
|
||||
<td>[metrics]</td>
|
||||
<td><literal>weight_setting</literal></td>
|
||||
<td>Determines how metrics are weighed. Use a comma-separated list of
|
||||
metricName=ratio. For example: "name1=1.0, name2=-1.0" results in:
|
||||
<literal>name1.value * 1.0 + name2.value * -1.0</literal>
|
||||
<td>Determines how metrics are weighed. Use a
|
||||
comma-separated list of metricName=ratio. For
|
||||
example: "name1=1.0, name2=-1.0" results in:
|
||||
<literal>name1.value * 1.0 + name2.value *
|
||||
-1.0</literal>
|
||||
</td>
|
||||
</tr>
|
||||
<tr valign="top">
|
||||
<td>[metrics]</td>
|
||||
<td><literal>required</literal></td>
|
||||
<td><para>Specifies how to treat unavailable metrics:<itemizedlist>
|
||||
<listitem><para>True—Raises an exception. To avoid the raised exception, you should use the scheduler
|
||||
filter <literal>MetricFilter</literal> to filter out hosts
|
||||
with unavailable metrics.</para></listitem>
|
||||
<listitem><para>False—Treated as a negative factor in the weighing process (uses the
|
||||
<option>weight_of_unavailable</option> option).</para></listitem>
|
||||
<listitem>
|
||||
<para>True—Raises an
|
||||
exception. To avoid the raised
|
||||
exception, you should use the
|
||||
scheduler filter
|
||||
<literal>MetricFilter</literal> to
|
||||
filter out hosts with unavailable
|
||||
metrics.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>False—Treated as a
|
||||
negative factor in the weighing
|
||||
process (uses the
|
||||
<option>weight_of_unavailable</option>
|
||||
option).</para>
|
||||
</listitem>
|
||||
</itemizedlist></para></td>
|
||||
</tr>
|
||||
<tr valign="top">
|
||||
<td>[metrics]</td>
|
||||
<td><literal>weight_of_unavailable</literal></td>
|
||||
<td>If <option>required</option> is set to False, and any one of the metrics set
|
||||
by <option>weight_setting</option> is unavailable, the
|
||||
<option>weight_of_unavailable</option> value is returned to the
|
||||
scheduler.</td>
|
||||
<td>If <option>required</option> is set to False,
|
||||
and any one of the metrics set by
|
||||
<option>weight_setting</option> is
|
||||
unavailable, the
|
||||
<option>weight_of_unavailable</option>
|
||||
value is returned to the scheduler.</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
@ -699,33 +752,42 @@ weight_of_unavailable=-10000.0</programlisting>
|
||||
<tr valign="top">
|
||||
<td>[cells]</td>
|
||||
<td><literal>mute_weight_multiplier</literal></td>
|
||||
<td>Multiplier to weigh mute children (hosts which have not sent capacity or
|
||||
capacity updates for some time). Use a negative, floating-point value.</td>
|
||||
<td>Multiplier to weigh mute children (hosts which
|
||||
have not sent capacity or capacity updates for
|
||||
some time). Use a negative, floating-point
|
||||
value.</td>
|
||||
</tr>
|
||||
<tr valign="top">
|
||||
<td>[cells]</td>
|
||||
<td><literal>mute_weight_value</literal></td>
|
||||
<td>Weight value assigned to mute children. Use a positive, floating-point value
|
||||
with a maximum of '1.0'.</td>
|
||||
<td>Weight value assigned to mute children. Use a
|
||||
positive, floating-point value with a maximum
|
||||
of '1.0'.</td>
|
||||
</tr>
|
||||
<tr valign="top">
|
||||
<td>[cells]</td>
|
||||
<td><literal>offset_weight_multiplier</literal></td>
|
||||
<td>Multiplier to weigh cells, so you can specify a preferred cell. Use a floating
|
||||
point value.</td>
|
||||
<td>Multiplier to weigh cells, so you can specify
|
||||
a preferred cell. Use a floating point
|
||||
value.</td>
|
||||
</tr>
|
||||
<tr valign="top">
|
||||
<td>[cells]</td>
|
||||
<td><literal>ram_weight_multiplier</literal></td>
|
||||
<td>By default, the scheduler spreads instances across all cells evenly. Set the
|
||||
<option>ram_weight_multiplier</option> option to a negative number if
|
||||
you prefer stacking instead of spreading. Use a floating-point value.</td>
|
||||
<td>By default, the scheduler spreads instances
|
||||
across all cells evenly. Set the
|
||||
<option>ram_weight_multiplier</option>
|
||||
option to a negative number if you prefer
|
||||
stacking instead of spreading. Use a
|
||||
floating-point value.</td>
|
||||
</tr>
|
||||
<tr valign="top">
|
||||
<td>[cells]</td>
|
||||
<td><literal>scheduler_weight_classes</literal></td>
|
||||
<td>Defaults to <literal>nova.cells.weights.all_weighers</literal>, which maps to
|
||||
all cell weighers included with Compute. Cells are then weighed and sorted
|
||||
<td>Defaults to
|
||||
<literal>nova.cells.weights.all_weighers</literal>,
|
||||
which maps to all cell weighers included with
|
||||
Compute. Cells are then weighed and sorted
|
||||
with the largest weight winning.</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
@ -752,8 +814,8 @@ offset_weight_multiplier=1.0</programlisting>
|
||||
href="../../common/section_cli_nova_host_aggregates.xml"/>
|
||||
<section xml:id="compute-scheduler-config-ref">
|
||||
<title>Configuration reference</title>
|
||||
<para>To customize the Compute scheduler, use the configuration option
|
||||
settings documented in <xref
|
||||
<para>To customize the Compute scheduler, use the
|
||||
configuration option settings documented in <xref
|
||||
linkend="config_table_nova_scheduling"/>.</para>
|
||||
</section>
|
||||
</section>
|
||||
|
||||
Loading…
Reference in New Issue
Block a user