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["Markus Zoeller \(markus_z\)" <mzoeller@xxxxxxxxxxxxxxxxxx>]

Cleanup
=======

This bug report has the status "Incomplete" since more than 30 days
and it looks like that there are no open reviews for it. To keep
the bug list sane, I close this bug with "won't fix". This does not
mean that it is not a valid bug report, it's more to acknowledge that
no progress can be expected here anymore. You are still free to push a
new patch for this bug. If you could reproduce it on the current master
code or on a maintained stable branch, please switch it to "Confirmed".

** Changed in: nova
       Status: Incomplete => Won't Fix

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https://bugs.launchpad.net/bugs/1537122

Title:
  Instance HW metadata aren't preserved after reboot

Status in OpenStack Compute (nova):
  Won't Fix

Bug description:
  Non-standard hardware settings of instance (e.g. NIC model) are set
  correctly for first boot after creation, but not kept after many nova
  operations, e.g. nova reboot  --hard or stop & start sequence. HW-
  specific options disappear from XML on host and virtio driver is used
  instead.

  Extra options like NIC model should be preserved after any instance
  modifications (reboot, stop&start, storage attach), but are missing.

  Version: nova-*  1:2015.1.2-0ubuntu1~cloud0, qemu-* 1:2.2+dfsg-5expubuntu9.3~cloud0 on Ubuntu 14.04.3.
  neutron-* 1:2015.1.2-0ubuntu1~cloud0

  Steps to reproduce:
  1. $ glance image-create --name test-e1000 --disk-format qcow2 --container-format bare --file cirros-0.3.4-i386-disk.img --property hw_disk_bus=ide --property hw_vif_model=e1000
  2. $ nova image-show 8da8e18b-f48b-4dc0-81ed-890dc223d410
  +-----------------------+--------------------------------------+
  | Property              | Value                                |
  +-----------------------+--------------------------------------+
  | id                    | 8da8e18b-f48b-4dc0-81ed-890dc223d410 |
  | metadata hw_disk_bus  | ide                                  |
  | metadata hw_vif_model | e1000                                |
  3. $ nova boot --image 8da8e18b-f48b-4dc0-81ed-890dc223d410 --flavor 1 --nic net-id=6de2c2fb-a770-4ef3-9a56-c320b339a95b test-e1000
  4. compute:~# virsh dumpxml instance-00021519 > /tmp/before
  5. $ nova reboot --hard 62f9d3de-7e30-420e-b744-a7755ca6ee0f
  6. compute:~# virsh dumpxml instance-00021519 > /tmp/after
      compute:~# diff -u /tmp/before /tmp/after

  --- /tmp/before 2016-01-22 15:43:01.530843360 +0100
  +++ /tmp/after  2016-01-22 15:43:20.151089791 +0100
  @@ -93,7 +93,7 @@
         <mac address='fa:16:3e:2a:f4:73'/>
         <source bridge='brq6de2c2fb-a7'/>
         <target dev='tap99d4e746-ac'/>
  -      <model type='e1000'/>
  +      <model type='virtio'/>
         <alias name='net0'/>
         <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
       </interface>

  I have Neutron ML2 with LinuxBridge underneath.

  I've tried to use "nova boot ... --image-with hw_vif_model=e1000",
  with no effect.

  
  There were no errors in logs, but content of XML in virt/libvirt/config.py is different:
  After first boot:
  2016-01-22 15:38:13.840 7788 DEBUG nova.virt.libvirt.config [req-5cc930fd-8d7f-4cd0-883c-9bd69672e3a0 4bb8f720d4c7494bb573b6033015cd0c cfb66212643842ad90d9fb5a83b84d52 - - -] Generated XML ('<domain type="kvm">\n  <uuid>62f9d3de-7e30-420
  e-b744-a7755ca6ee0f</uuid>\n  <name>instance-00021519</name>\n<<CUT>>    <interface type="bridge">\n      <mac address="fa:16:3e:2a:f4:73"/>\n      <model type="e1000"/>\n      <source bridge="brq6de2c2fb-a7"/>\n      <target dev="tap99d4e746-ac"/>\n    </interface>\n<<CUT>>',)  to_xml /usr/lib/python2.7/dist-packages/
  nova/virt/libvirt/config.py:82

  After reboot:
  2016-01-22 15:43:14.070 7788 DEBUG nova.virt.libvirt.config [req-254da7a4-b370-4557-8cf6-e977a6b60bb1 4bb8f720d4c7494bb573b6033015cd0c cfb66212643842ad90d9fb5a83b84d52 - - -] Generated XML ('<domain type="kvm">\n  <uuid>62f9d3de-7e30-420
  e-b744-a7755ca6ee0f</uuid>\n  <name>instance-00021519</name>\n <<CUT>>    <interface type="bridge">\n      <mac address="fa:16:3e:2a:f4:73"/>\n      <model type="virtio"/>\n      <source bridge="brq6de2c2fb-a7"/>\n      <target dev="tap99d4e746-ac"/>\n    </interface>\n<<CUT>>',)  to_xml /usr/lib/python2.7/dist-packages/nova/virt/libvirt/config.py:82

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