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<div>I understand the fact that an opertaor can and should be able to place the VM where she/he wants. The VM should just adhere to the scheduling constraints :) (which are defined in the filters)</div>
<div>:)</div>
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<span style="font-weight:bold">From: </span>Rui Chen <<a href="mailto:chenrui.momo@gmail.com">chenrui.momo@gmail.com</a>><br>
<span style="font-weight:bold">Reply-To: </span>OpenStack List <<a href="mailto:openstack-dev@lists.openstack.org">openstack-dev@lists.openstack.org</a>><br>
<span style="font-weight:bold">Date: </span>Thursday, February 12, 2015 at 1:51 PM<br>
<span style="font-weight:bold">To: </span>OpenStack List <<a href="mailto:openstack-dev@lists.openstack.org">openstack-dev@lists.openstack.org</a>><br>
<span style="font-weight:bold">Subject: </span>Re: [openstack-dev] [nova] Question about force_host skip filters<br>
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<div dir="ltr"><span style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-size: 14px;"> filters should be applied to the list of hosts that are in ‘force_hosts’.</span><br>
<div><span style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-size: 14px;"><br>
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<div><span style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-size: 14px;">Yes, @Gray, it's my point.</span></div>
<div><span style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-size: 14px;"><br>
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<div><span style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-size: 14px;">Operator can live-migrate a instance to a </span><span style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-size: 14px;">specified host and skip filters,
it's apposite and important, I agree with you.</span></div>
<div><span style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-size: 14px;"><br>
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<div><font color="#000000" face="Calibri,sans-serif"><span style="font-size:14px">But when we boot instance, we always want to launch a instance successfully or get a clear failure reason, if the filters are applied for the force host, operator maybe find out
that he is doing something wrong at earlier time. For example, he couldn't boot a pci instance on a force host that don't own pci device.</span></font><br>
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<div><span style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-size: 14px;"><br>
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<div><font color="#000000" face="Calibri,sans-serif"><span style="font-size:14px">and I don't think 'force_hosts' is operator action, the default value is 'is_admin:True' in policy.json, but in some case the value may be changed so that the regular user can
boot instance on specified</span></font><span style="font-size: 14px; color: rgb(0, 0, 0); font-family: Calibri, sans-serif;"> host.</span></div>
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<div class="gmail_quote">2015-02-12 17:44 GMT+08:00 Sylvain Bauza <span dir="ltr">
<<a href="mailto:sbauza@redhat.com" target="_blank">sbauza@redhat.com</a>></span>:<br>
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<div>Le 12/02/2015 10:05, Rui Chen a écrit :<br>
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<div dir="ltr">Hi:
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<div> If we boot instance with 'force_hosts', the force host will skip all filters, looks like that it's intentional logic, but I don't know the reason.</div>
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<div> I'm not sure that the skipping logic is apposite, I think we should remove the skipping logic, and the 'force_hosts' should work with the scheduler, test whether the force host is appropriate ASAP. Skipping filters and postponing the booting failure
to nova-compute is not advisable.</div>
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<div> On the other side, more and more options had been added into flavor, like NUMA, cpu pinning, pci and so on, forcing a suitable host is more and more difficult.</div>
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Any action done by the operator is always more important than what the Scheduler could decide. So, in an emergency situation, the operator wants to force a migration to an host, we need to accept it and do it, even if it doesn't match what the Scheduler could
decide (and could violate any policy)<br>
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That's a *force* action, so please leave the operator decide.<br>
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-Sylvain<br>
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<div>Best Regards.</div>
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