openstack
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nova
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Added description of operators for extra_specs 

There are several new operators added for extra_specs that are used
in compute capability filter and aggregate filter. These are
described in document in this patch. Fixed bug 1047036.

Change-Id: Id86c6672d7bda458ecb918f1900d6f8a9526ad41
This commit is contained in:
Jinwoo 'Joseph' Suh 2012-09-11 11:28:51 -04:00 committed by Thierry Carrez
parent b36b368179
commit c75e81e003
1 changed files with 25 additions and 0 deletions
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25
doc/source/devref/filter_scheduler.rst
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@ -36,9 +36,34 @@ There are some standard filter classes to use (:mod:`nova.scheduler.filters`):
host compute service satisfy any extra specifications associated with the
instance type (that have no scope, see |TrustedFilter| for details). It
passes hosts that can create the specified instance type.
The extra specifications can have an operator at the beginning of the value
string of a key/value pair. If there is no operator specified, then a
default operator of 's==' is used. Valid operators are:
::
* = (equal to or greater than as a number; same as vcpus case)
* == (equal to as a number)
* != (not equal to as a number)
* >= (greater than or equal to as a number)
* <= (less than or equal to as a number)
* s== (equal to as a string)
* s!= (not equal to as a string)
* s>= (greater than or equal to as a string)
* s> (greater than as a string)
* s<= (less than or equal to as a string)
* s< (less than as a string)
* <in> (substring)
* <or> (find one of these)
Examples are: ">= 5", "s== 2.1.0", "<in> gcc", and "<or> fpu <or> gpu"
* |AggregateInstanceExtraSpecsFilter| - checks that the aggregate metadata
satisfies any extra specifications associated with the instance type (that
have no scope). It passes hosts that can create the specified instance type.
The extra specifications can have the same operators as
|ComputeCapabilityFilter|.
* |ComputeFilter| - passes all hosts that are operational and enabled.
* |CoreFilter| - filters based on CPU core utilization. It passes hosts with
sufficient number of CPU cores.