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Hi</div>
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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 VM</li><li>Bring up nova compute on old node</li></ol>
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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</div>
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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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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.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_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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<span style="font-variant-ligatures: no-common-ligatures"> # Reset device_id and device_owner for the ports that are skipped</span></p>
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<span style="font-variant-ligatures: no-common-ligatures"> if data.get('ports', []):</span></p>
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<span style="font-variant-ligatures: no-common-ligatures"> self._unbind_ports(context, ports_to_skip, neutron)</span></p>
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<span style="font-variant-ligatures: no-common-ligatures"> else:</span></p>
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<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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<span style="font-variant-ligatures: no-common-ligatures">Ajay</span></p>
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