Baremetal vms start failed in devstack arising from network dev is down

[Tao Li]

## environment
1. Centos 6.5
2. nova version:
[stack@devstack devstack]$ nova --version
9.0.0

3.openstack version:
[stack@devstack devstack]$ openstack --version
openstack 3.11.0

4.[stack@devstack devstack]$ ironic --version
1.13.0

## Description
In devstack with ironic environment, I deployed vms as baremetal nodes failed. I found the tap devices attached to vms were down when started vms. Then the ironic couldn't deploy the vms because of dhcp failed. I reviewed the vm.xml and found it missing a parameter. This is the current configuration.

    <interface type='ethernet'>
      <target dev='{{ "tap-" + name + "i" + n|string }}'/>
      <model type='{{ nicdriver }}'/>
      <address type='pci' domain='0x0000' bus='0x01' slot='{{ "0x0" + n|string }}' function='0x0'/>
    </interface>

After I added a parameter 'path' and then it worked well。

    <interface type='ethernet'>
      <target dev='{{ "tap-" + name + "i" + n|string }}'/>
      <script path='/etc/qemu-ifup'/>
      <model type='{{ nicdriver }}'/>
      <address type='pci' domain='0x0000' bus='0x01' slot='{{ "0x0" + n|string }}' function='0x0'/>
    </interface>

So in order to launch the vms successfully everytime， we need to add the parameter. For details， see the libvirt official site： http://libvirt.org/formatdomain.html#elementsNICSEthernet

[Sean Dague (sdague)]

No version was found in the description, which is required, marking as Incomplete. Please update the bug description to include 'devstack version: ... '.

[Tao Li (eric-litao)]

@Sean Dague，I updated the nova and openstack versions， but I don't know how to check the devstack version.I always use the latest vesion in master branch.

[Sean Dague (sdague)]

There are no currently open reviews on this bug, changing the status back to the previous state and unassigning. If there are active reviews related to this bug, please include links in comments.

[Launchpad Janitor (janitor)]

[Expired for devstack because there has been no activity for 60 days.]