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Agreed. That's largely the effort of the Orchestration group.
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<div id="divRpF6014" style="direction: ltr; "><font face="Tahoma" size="2" color="#000000"><b>From:</b> openstack-bounces+sandy.walsh=rackspace.com@lists.launchpad.net [openstack-bounces+sandy.walsh=rackspace.com@lists.launchpad.net] on behalf of Joshua Harlow
[harlowja@yahoo-inc.com]<br>
<b>Sent:</b> Thursday, May 03, 2012 12:35 AM<br>
<b>To:</b> openstack<br>
<b>Subject:</b> [Openstack] Nova idear, thoughts wanted.<br>
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<div><font face="Calibri, Verdana, Helvetica, Arial"><span style="font-size:11pt">Hi all,<br>
<br>
I was thinking today about how nova-compute could become more pluggable.<br>
I was wondering if there had been any thought into how say each method, say in the compute-manager could almost become a set of stages in a pipeline.<br>
For example the run instance method is really doing the following steps:<br>
<br>
</span></font><span style="font-size:11pt"><font face="Courier, Courier New">run_instance:<br>
steps:<br>
- check_instance_not_already_created<br>
- check_image_size<br>
- notify_about_instance_usage<br>
- instance_update(BUILDING)<br>
- allocate_network<br>
- prep_block_device<br>
- spawn:<br>
- instance_update(BUILD)<br>
- driver_spawn<br>
- instance_update(ACTIVE)<br>
on_failure:<br>
- deallocate_network<br>
</font><font face="Calibri, Verdana, Helvetica, Arial"><br>
This reminds me slightly of what devstackpy (to be renamed soon) does but instead of via code, actions are partially defined via config/persona/.... Now say if the above steps are plugins (similar to say a paste pipeline) then it becomes easy for company Y
to add special sauce Z before or after stage W. I was just wondering what people thought about this. It sort of makes nova more of a orchestrator that loads plugins that perform various pipelines, where in nova’s case those pipelines are VM related.
<br>
<br>
Comments welcome. This might already have been thought of, but if so, that’s ok also :-)<br>
<br>
-Josh</font></span> </div>
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