openstack/nova
Code Issues Proposed changes

Add flag to make IsolatedHostsFilter less restrictive

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This patch allows to run 'isolated' and 'non isolated'
images on isolated hosts by adding a flag
'restrict_isolated_hosts_to_isolated_images'.

If the flag is set to True then 'non isolated' images
can't be run on isolated hosts (same behaviour as the
current filter) otherwise they can be run on isolated
hosts.

DocImpact

blueprint improve-isolatedhostsfilter

Change-Id: I8c092caf32c05be88a547a7e8cb0530cc4925080
This commit is contained in:
Yassine Lamgarchal
2013-08-02 16:44:54 +02:00
parent c6d5325ef6
commit 35925e5d28
4 changed files with 50 additions and 10 deletions
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7
doc/source/devref/filter_scheduler.rst
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@@ -79,8 +79,8 @@ There are some standard filter classes to use (:mod:`nova.scheduler.filters`):
fall back to the global default ``cpu_allocation_ratio``. If more than one value
is found for a host (meaning the host is in two differenet aggregate with
different ratio settings), the minimum value will be used.
* |IsolatedHostsFilter| - filter based on ``image_isolated`` and ``host_isolated``
flags.
* |IsolatedHostsFilter| - filter based on ``image_isolated``, ``host_isolated``
and ``restrict_isolated_hosts_to_isolated_images`` flags.
* |JsonFilter| - allows simple JSON-based grammar for selecting hosts.
* |RamFilter| - filters hosts by their RAM. Only hosts with sufficient RAM
to host the instance are passed.
@@ -166,7 +166,8 @@ Now we are going to |IsolatedHostsFilter|. There can be some special hosts
reserved for specific images. These hosts are called **isolated**. So the
images to run on the isolated hosts are also called isolated. This Scheduler
checks if ``image_isolated`` flag named in instance specifications is the same
that the host has.
that the host has. Isolated hosts can run non isolated images if the flag
``restrict_isolated_hosts_to_isolated_images`` is set to false.
|DifferentHostFilter| - its method ``host_passes`` returns ``True`` if host to
place instance on is different from all the hosts used by set of instances.