Merge "Config Ref: Improve Compute scheduler description"
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@ -163,7 +163,7 @@
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>nova-scheduler</systemitem> service to enable host
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aggregates filtering, as well as the other filters that
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are typically
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enabled:<programlisting language="ini">scheduler_default_filters=AggregateInstanceExtraSpecsFilter,AvailabilityZoneFilter,RamFilter,ComputeFilter</programlisting></para>
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enabled:<programlisting language="ini">scheduler_default_filters=AggregateInstanceExtraSpecsFilter,RetryFilter,AvailabilityZoneFilter,RamFilter,ComputeFilter,ComputeCapabilitiesFilter,ImagePropertiesFilter,ServerGroupAntiAffinityFilter,ServerGroupAffinityFilter</programlisting></para>
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</simplesect>
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<simplesect>
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<title>Example: Specify compute hosts with SSDs</title>
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@ -23,10 +23,10 @@
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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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scheduler_driver_task_period = 60
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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 <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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@ -56,9 +56,20 @@ scheduler_default_filters=RetryFilter,AvailabilityZoneFilter,RamFilter,ComputeFi
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<listitem>
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<para>Satisfy any architecture, hypervisor type, or
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virtual machine mode properties specified on the
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instance's image properties.
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instance's image properties
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(<literal>ImagePropertiesFilter</literal>).</para>
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</listitem>
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<listitem>
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<para>
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Are on a different host than other instances of a group
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(if requested)
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(<literal>ServerGroupAntiAffinityFilter</literal>).</para>
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</listitem>
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<listitem>
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<para>
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Are in a set of group hosts (if requested)
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(<literal>ServerGroupAffinityFilter</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; use the
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<option>scheduler_driver_task_period</option> option to
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@ -129,26 +140,44 @@ scheduler_default_filters=RetryFilter,AvailabilityZoneFilter,RamFilter,ComputeFi
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use both the built-in filters and your custom filter, your
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<filename>nova.conf</filename> file would
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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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<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>
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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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<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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<section xml:id="aggregatecorefilter">
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<section xml:id="aggregate-corefilter">
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<title>AggregateCoreFilter</title>
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<para>Implements blueprint per-aggregate-resource-ratio.
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AggregateCoreFilter supports per-aggregate
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<literal>cpu_allocation_ratio</literal>. If the
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per-aggregate value is not found, the value falls back
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to the global setting.</para>
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<para>
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Filters host by CPU core numbers with a per-aggregate
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<literal>cpu_allocation_ratio</literal> value. If the
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per-aggregate value is not found, the value falls back
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to the global setting. If the host is in more than one
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aggregate and more than one value is found, the minimum
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value will be used. For information about how to use
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this filter, see <xref linkend="host-aggregates"/>. See
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also <xref linkend="corefilter"/>.
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</para>
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</section>
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<section xml:id="aggregateimagepropertiesisolationfilter">
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<section xml:id="aggregate-diskfilter">
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<title>AggregateDiskFilter</title>
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<para>
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Filters host by disk allocation with a per-aggregate
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<literal>disk_allocation_ratio</literal> value. If the
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per-aggregate value is not found, the value falls back to
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the global setting. If the host is in more than one
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aggregate and more than one value is found, the minimum
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value will be used. For information about how to use this
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filter, see <xref linkend="host-aggregates"/>. See also
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<xref linkend="diskfilter"/>.
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</para>
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</section>
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<section xml:id="aggregate-imagepropertiesisolationfilter">
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<title>AggregateImagePropertiesIsolation</title>
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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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@ -192,26 +221,38 @@ scheduler_available_filters=myfilter.MyFilter</programlisting>
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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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aggregate_image_properties_isolation_namespace = <None>
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# Separator used between the namespace and keys (string).
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aggregate_image_properties_isolation_separator=.</programlisting>
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aggregate_image_properties_isolation_separator = .</programlisting>
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</section>
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<section xml:id="aggregateinstanceextraspecsfilter">
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<section xml:id="aggregate-instanceextraspecsfilter">
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<title>AggregateInstanceExtraSpecsFilter</title>
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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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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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instance type against admin-defined properties on a host
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aggregate. Works with specifications that are scoped with
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<literal>aggregate_instance_extra_specs</literal>. For
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backward compatibility, also works with non-scoped
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specifications; this action is highly discouraged because
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it conflicts with <link
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linkend="computecapabilitiesfilter">
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ComputeCapabilitiesFilter</link> filter when you enable
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both filters. For information about how to use this
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filter, see the <link linkend="host-aggregates">host
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aggregates</link> section.</para>
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</section>
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<section xml:id="aggregate-ioopsfilter">
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<title>AggregateIoOpsFilter</title>
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<para>
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Filters host by disk allocation with a per-aggregate
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<literal>max_io_ops_per_host</literal> value. If the
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per-aggregate value is not found, the value falls back to
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the global setting. If the host is in more than one
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aggregate and more than one value is found, the minimum
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value will be used. For information about how to use this
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filter, see <xref linkend="host-aggregates"/>. See
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also <xref linkend="ioopsfilter"/>.
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</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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@ -225,14 +266,43 @@ aggregate_image_properties_isolation_separator=.</programlisting>
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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-numinstances-filter">
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<title>AggregateNumInstancesFilter</title>
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<para>
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Filters host by number of instances with a per-aggregate
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<literal>max_instances_per_host</literal> value. If the
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per-aggregate value is not found, the value falls back to
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the global setting. If the host is in more than one
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aggregate and thus more than one value is found, the
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minimum value will be used. For information about how to
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use this filter, see <xref
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linkend="host-aggregates"/>. See also <xref
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linkend="numinstancesfilter"/>.
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</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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<para>Implements blueprint
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<literal>per-aggregate-resource-ratio</literal>.
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Supports per-aggregate
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<literal>ram_allocation_ratio</literal>. If
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per-aggregate value is not found, it falls back to the
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default setting.</para>
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<title>AggregateRamFilter</title>
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<para>
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Filters host by RAM allocation of instances with a per-aggregate
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<literal>ram_allocation_ratio</literal> value. If the
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per-aggregate value is not found, the value falls back to
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the global setting. If the host is in more than one
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aggregate and thus more than one value is found, the
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minimum value will be used. For information about how to
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use this filter, see <xref
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linkend="host-aggregates"/>. See also <xref
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linkend="ramfilter"/>.
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</para>
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</section>
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<section xml:id="aggregate-typeaffinityfilter">
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<title>AggregateTypeAffinityFilter</title>
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<para>
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Filters host by per-aggregate
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<literal>instance_type</literal> value. For information
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about how to use this filter, see <xref
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linkend="host-aggregates"/>. See also <xref
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linkend="typeaffinityfilter"/>.
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</para>
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</section>
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<section xml:id="allhostsfilter">
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<title>AllHostsFilter</title>
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@ -258,7 +328,7 @@ aggregate_image_properties_isolation_separator=.</programlisting>
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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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<link linkend="aggregate-instanceextraspecsfilter">
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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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@ -278,15 +348,15 @@ aggregate_image_properties_isolation_separator=.</programlisting>
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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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configuration option in
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<filename>nova.conf</filename>. The default setting
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is:</para>
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<programlisting language="ini">cpu_allocation_ratio=16.0</programlisting>
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<programlisting language="ini">cpu_allocation_ratio = 16.0</programlisting>
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<para>With this setting, if 8 vCPUs are on a node, the
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scheduler allows instances up to 128 vCPU to be run on
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that node.</para>
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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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<programlisting language="ini">cpu_allocation_ratio = 1.0</programlisting>
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<note>
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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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@ -327,10 +397,10 @@ aggregate_image_properties_isolation_separator=.</programlisting>
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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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configuration option in
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<filename>nova.conf</filename>. The default setting
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is:</para>
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<programlisting language="ini">disk_allocation_ratio=1.0</programlisting>
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<programlisting language="ini">disk_allocation_ratio = 1.0</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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@ -432,8 +502,8 @@ aggregate_image_properties_isolation_separator=.</programlisting>
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using the <literal>isolated_hosts</literal> and
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<literal>isolated_images</literal> configuration
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options. For example:</para>
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<programlisting language="ini">isolated_hosts=server1,server2
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isolated_images=342b492c-128f-4a42-8d3a-c5088cf27d13,ebd267a6-ca86-4d6c-9a0e-bd132d6b7d09</programlisting>
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<programlisting language="ini">isolated_hosts = server1, server2
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isolated_images = 342b492c-128f-4a42-8d3a-c5088cf27d13, ebd267a6-ca86-4d6c-9a0e-bd132d6b7d09</programlisting>
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</section>
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<section xml:id="ioopsfilter">
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<title>IoOpsFilter</title>
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@ -483,19 +553,19 @@ isolated_images=342b492c-128f-4a42-8d3a-c5088cf27d13,ebd267a6-ca86-4d6c-9a0e-bd1
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</listitem>
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</itemizedlist>The filter supports the following variables:<itemizedlist>
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<listitem>
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<para>$free_ram_mb</para>
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<para><code>$free_ram_mb</code></para>
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</listitem>
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<listitem>
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<para>$free_disk_mb</para>
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<para><code>$free_disk_mb</code></para>
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</listitem>
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<listitem>
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<para>$total_usable_ram_mb</para>
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<para><code>$total_usable_ram_mb</code></para>
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</listitem>
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<listitem>
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<para>$vcpus_total</para>
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<para><code>$vcpus_total</code></para>
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</listitem>
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<listitem>
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<para>$vcpus_used</para>
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<para><code>$vcpus_used</code></para>
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</listitem>
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</itemizedlist>Using the <command>nova</command>
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command-line tool, use the <literal>--hint</literal>
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@ -506,6 +576,14 @@ isolated_images=342b492c-128f-4a42-8d3a-c5088cf27d13,ebd267a6-ca86-4d6c-9a0e-bd1
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<literal>os:scheduler_hints</literal> key:</para>
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<programlisting language="json"><xi:include href="../../common/samples/server-scheduler-hints2.json" parse="text"/></programlisting>
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</section>
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<section xml:id="metricsfilter">
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<title>MetricsFilter</title>
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<para>Filters hosts based on metrics
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<literal>weight_setting</literal>. Only hosts with the
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available metrics are passed so that the metrics weigher
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will not fail due to these hosts.
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</para>
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</section>
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<section xml:id="numinstancesfilter">
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<title>NumInstancesFilter</title>
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<para>
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@ -535,7 +613,7 @@ isolated_images=342b492c-128f-4a42-8d3a-c5088cf27d13,ebd267a6-ca86-4d6c-9a0e-bd1
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configuration option in
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<filename>nova.conf</filename>. The default setting
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is:</para>
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<programlisting language="ini">ram_allocation_ratio=1.5</programlisting>
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<programlisting language="ini">ram_allocation_ratio = 1.5</programlisting>
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<para>This setting enables 1.5 GB instances to run on
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any compute node with 1 GB of free RAM.</para>
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</section>
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@ -634,6 +712,23 @@ isolated_images=342b492c-128f-4a42-8d3a-c5088cf27d13,ebd267a6-ca86-4d6c-9a0e-bd1
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<literal>os:scheduler_hints</literal> key:</para>
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<programlisting language="json"><xi:include href="../../common/samples/server-scheduler-hints4.json" parse="text"/></programlisting>
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</section>
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<section xml:id="trustedfilter">
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<title>TrustedFilter</title>
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<para>
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Filters hosts based on their trust. Only passes hosts that
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meet the trust requirements specified in the instance
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properties.
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</para>
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</section>
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<section xml:id="typeaffinityfilter">
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<title>TypeAffinityFilter</title>
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<para>
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Dynamically limits hosts to one instance type. An instance
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can only be launched on a host, if no instance with
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different instances types are running on it, or if the
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host has no running instances at all.
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</para>
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</section>
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</section>
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<section xml:id="weights">
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<title>Weights</title>
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@ -759,14 +854,14 @@ isolated_images=342b492c-128f-4a42-8d3a-c5088cf27d13,ebd267a6-ca86-4d6c-9a0e-bd1
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</table>
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<para>For example:</para>
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<programlisting language="ini">[DEFAULT]
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scheduler_host_subset_size=1
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scheduler_weight_classes=nova.scheduler.weights.all_weighers
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ram_weight_multiplier=1.0
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scheduler_host_subset_size = 1
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scheduler_weight_classes = nova.scheduler.weights.all_weighers
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ram_weight_multiplier = 1.0
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[metrics]
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weight_multiplier=1.0
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weight_setting=name1=1.0, name2=-1.0
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required=false
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weight_of_unavailable=-10000.0</programlisting>
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weight_multiplier = 1.0
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weight_setting = name1=1.0, name2=-1.0
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required = false
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weight_of_unavailable = -10000.0</programlisting>
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<table rules="all" xml:id="table_cell-weighting-options">
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<caption>Cell weighting options</caption>
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<col width="10%" title="Section"/>
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@ -825,11 +920,11 @@ weight_of_unavailable=-10000.0</programlisting>
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</table>
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<para>For example:</para>
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<programlisting language="ini">[cells]
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scheduler_weight_classes=nova.cells.weights.all_weighers
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mute_weight_multiplier=-10.0
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mute_weight_value=1000.0
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ram_weight_multiplier=1.0
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offset_weight_multiplier=1.0</programlisting>
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scheduler_weight_classes = nova.cells.weights.all_weighers
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mute_weight_multiplier = -10.0
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mute_weight_value = 1000.0
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ram_weight_multiplier = 1.0
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offset_weight_multiplier = 1.0</programlisting>
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</section>
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<section xml:id="chance-scheduler">
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<title>Chance scheduler</title>
|
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