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Hi </div>
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I logged the following bug</div>
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<a href="https://bugs.launchpad.net/nova/+bug/1634269">https://bugs.launchpad.net/nova/+bug/1634269</a></div>
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<div>I sent out review below please let me know if I am on right track</div>
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<a href="https://review.openstack.org/#/c/387687/">https://review.openstack.org/#/c/387687/</a></div>
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<u>Ajay</u></div>
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<span style="font-weight:bold">From: </span>Kevin Benton <<a href="mailto:kevin@benton.pub">kevin@benton.pub</a>><br>
<span style="font-weight:bold">Reply-To: </span>"OpenStack Development Mailing List (not for usage questions)" <<a href="mailto:openstack-dev@lists.openstack.org">openstack-dev@lists.openstack.org</a>><br>
<span style="font-weight:bold">Date: </span>Friday, October 14, 2016 at 1:23 AM<br>
<span style="font-weight:bold">To: </span>"OpenStack Development Mailing List (not for usage questions)" <<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] [openstack][nova] Port unbound from active VM<br>
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<div dir="ltr">I suggest filing a bug against nova for this. </div>
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<div class="gmail_quote">On Thu, Oct 13, 2016 at 9:44 AM, Ajay Kalambur (akalambu)
<span dir="ltr"><<a href="mailto:akalambu@cisco.com" target="_blank">akalambu@cisco.com</a>></span> wrote:<br>
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<div>Any comments/input on this?</div>
<div>Ajay</div>
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<span style="font-weight:bold">From: </span>Ajay Kalambur <<a href="mailto:akalambu@cisco.com" target="_blank">akalambu@cisco.com</a>><br>
<span style="font-weight:bold">Date: </span>Monday, October 10, 2016 at 6:31 PM<br>
<span style="font-weight:bold">To: </span>"OpenStack Development Mailing List (not for usage questions)" <<a href="mailto:openstack-dev@lists.openstack.org" target="_blank">openstack-dev@lists.<wbr>openstack.org</a>><br>
<span style="font-weight:bold">Subject: </span>[openstack][nova] Port unbound from active VM<br>
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<div style="color:rgb(0,0,0);font-family:Calibri,sans-serif;font-size:14px">Hi</div>
<div style="color:rgb(0,0,0);font-family:Calibri,sans-serif;font-size:14px">There seems to be a corner case bug in nova code. Steps to reproduce it are</div>
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<li>Create a neutron port </li><li>Create a VM and launch instance with this port</li><li>Shutdown nova compute and network agent on compute node</li><li>Unbind port from VM and delete the VM (offline delete) </li><li>Now create a VM with same port but on a different compute node<span class=""></span></li><li>Bring up nova compute on old node</span></li></ol>
<div style="color:rgb(0,0,0);font-family:Calibri,sans-serif;font-size:14px">It basically runs the reap for deleted instances and cleanes up VM from libvirt. In the process it unbinds the pre-existing ports and ends up unbinding the port from an active VM on
a different compute node</div>
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<div style="color:rgb(0,0,0);font-family:Calibri,sans-serif;font-size:14px">Reason nova simply sends a blind port-update with binding_host: “” even if that port is bound to a different instance</div>
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<div style="color:rgb(0,0,0);font-family:Calibri,sans-serif;font-size:14px">So following fix seemed to help any suggestions on a better fix</div>
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<div><font face="Calibri,sans-serif">In </font><font face="Menlo"><span style="font-size:12px">nova/network/neutronv2/api.<wbr>py. So basically when neutron sees no ports for this instance don’t attempt an unbind</span></font></div>
<div><font face="Menlo"><span style="font-size:12px">In this case </span></font><span style="font-family:Menlo;font-size:12px"> </span></div>
<div><span style="font-family:Menlo;font-size:12px">data = neutron.list_ports(**search_<wbr>opts)</span></div>
<div><font face="Menlo"><span style="font-size:12px">C</span></font><span style="font-family:Menlo;font-size:12px">all in </span><span style="font-family:Menlo;font-size:12px">deallocate_for_instance returns empty ports</span></div>
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<p style="margin:0px;font-size:12px;line-height:normal;font-family:Menlo"><span style="font-variant-ligatures:no-common-ligatures"> # Reset device_id and device_owner for the ports that are skipped</span></p>
<p style="margin:0px;font-size:12px;line-height:normal;font-family:Menlo"><span style="font-variant-ligatures:no-common-ligatures"> if data.get('ports', []):</span></p>
<p style="margin:0px;font-size:12px;line-height:normal;font-family:Menlo"><span style="font-variant-ligatures:no-common-ligatures"> self._unbind_ports(context, ports_to_skip, neutron)</span></p>
<p style="margin:0px;font-size:12px;line-height:normal;font-family:Menlo"><span style="font-variant-ligatures:no-common-ligatures"> else:</span></p>
<p style="margin:0px;font-size:12px;line-height:normal;font-family:Menlo"><span style="font-variant-ligatures:no-common-ligatures"> LOG.debug("Neutron sees a different view of this port hence skipping unbind”)</span></p>
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<p style="margin:0px;font-size:12px;line-height:normal;font-family:Menlo"><span style="font-variant-ligatures:no-common-ligatures">Ajay</span></p>
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