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<p class="MsoNormal">Hi matt<o:p></o:p></p>
<p class="MsoNormal">You not only currently so I taught I would respond to your question regarding the workflow via email.<o:p></o:p></p>
<p class="MsoNormal"><a href="http://eavesdrop.openstack.org/irclogs/%23openstack-nova/%23openstack-nova.2017-10-18.log.html#t2017-10-18T20:29:02">http://eavesdrop.openstack.org/irclogs/%23openstack-nova/%23openstack-nova.2017-10-18.log.html#t2017-10-18T20:29:02</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">mriedem 1. conductor asks scheduler for a host 20:29<o:p></o:p></p>
<p class="MsoNormal">mriedem 2. scheduler filter looks for ports with a qos policy and if found, gets allocatoin candidates for hosts that have a nested bw provider 20:29<o:p></o:p></p>
<p class="MsoNormal">mriedem 3. scheduler returns host to conductor 20:29<o:p></o:p></p>
<p class="MsoNormal">mriedem 4. conductor binds the port to the host 20:30<o:p></o:p></p>
<p class="MsoNormal">mriedem 5. the bound port profile has some allocation juju that nova proxies to placement as an allocation request for the port on the bw provider 20:30<o:p></o:p></p>
<p class="MsoNormal">mriedem 6. conductor sends to compute to build the instance 20:30<o:p></o:p></p>
<p class="MsoNormal">mriedem 7. compute activates the bound port 20:30<o:p></o:p></p>
<p class="MsoNormal">mriedem 8. compute plugs vifs 20:30<o:p></o:p></p>
<p class="MsoNormal">mriedem 9. profit?!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">So my ideal workflow would be<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>conductor calls allocate_for_instance <a href="https://github.com/openstack/nova/blob/1b45b530448c45598b62e783bdd567480a8eb433/nova/network/neutronv2/api.py#L814">
https://github.com/openstack/nova/blob/1b45b530448c45598b62e783bdd567480a8eb433/nova/network/neutronv2/api.py#L814</a><br>
in schedule_and_build_instances <a href="https://github.com/openstack/nova/blob/fce56ce8c04b20174cd89dfbc2c06f0068324b55/nova/conductor/manager.py#L1002">
https://github.com/openstack/nova/blob/fce56ce8c04b20174cd89dfbc2c06f0068324b55/nova/conductor/manager.py#L1002</a><br>
Before calling self._schedule_instances. This <b><u>get or creates all neutron ports</u></b> for the instance before we call the scheduler.<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>conductor asks scheduler for a host by calling self._schedule_instances passing in the network_info object.<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>scheduler extract placement requests form network_info object and adds them to the list it send to placement.<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">4.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Scheduler applies standard filters to placement candidates.<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">5.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>scheduler returns host after weighing to conductor.<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">6.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>conductor binds the port to the host.<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:54.0pt;text-indent:-18.0pt;mso-list:l1 level2 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">a.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>if it fails early retry on next host in candidate set.<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:54.0pt;text-indent:-18.0pt;mso-list:l1 level2 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">b.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Continue until port binding succeeds, retry limit is reached, or candidate are exhausted
<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">7.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>The conductor creates allocations for the host against all resource providers.<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:54.0pt;text-indent:-18.0pt;mso-list:l1 level2 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">a.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>When the port is bound neutron will populate the resource request for bandwidth, with the neutron agent uuid which will be the resource provider uuid to allocate from.<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">8.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>conductor sends to compute to build the instance passing the allocations<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">9.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>compute plugs vifs<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">10.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>compute activates the bound port setting the allocation uuid on the port for all resource classes request by neutron<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">11.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>excess of income over expenditure? <span style="font-family:Wingdings">
J</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The important thing to note is nova recives all request for network resouces form neutron in the port objects created at step 1<o:p></o:p></p>
<p class="MsoNormal">Nova learns the backend resource provider for neutron at step 6 before it makes allocations<o:p></o:p></p>
<p class="MsoNormal">Nova then passes the allocation that were made back to neutron when it activate the port.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We have nova make the allocation for all resources to prevent any races between the conductor and neutron when updating the same nested resource provider tree.<o:p></o:p></p>
<p class="MsoNormal">(this was jays concern)<o:p></o:p></p>
<p class="MsoNormal">Neutron will create the inventories for bandwith but nova will allocate form the them.<o:p></o:p></p>
<p class="MsoNormal">The intent is for nova to not need to know what the resource it is claim are, but instead be able to accept a set of additional resocues to claim form neutron in a generic<o:p></o:p></p>
<p class="MsoNormal">Workflow which we can hopefully reuse for other project like cinder or cyborg in the future.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards sean.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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