From vitta2d at yahoo.com Sat Jun  6 10:44:38 2015
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From: Chiradeep Vittal <vitta2d at yahoo.com>
To: virt at lists.fedoraproject.org
Subject: [fedora-virt] fc12 virsh tap networking problem
Date: Tue, 08 Dec 2009 19:43:47 -0800
Message-ID: <254976.47324.qm@web180307.mail.gq1.yahoo.com>

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Hi,
On a fresh FC12 system, I am able to create and run KVM-based vms with tap =
networking using the qemu-kvm command line but not using virsh.
I have user and group set to "root" in /etc/libvirt/qemu.conf. "user mode n=
etworking" works with virsh, but not tap! selinux is disabled. =


I have this xml:
<domain type=3D'kvm'>
  <name>centos</name>
  <uuid>22d9d573-d82c-c18d-36c0-d3ffef057468</uuid>
  <memory>131072</memory>
  <vcpu>1</vcpu>
  <os>
    <type arch=3D'x86_64'>hvm</type>
  </os>
  <features>
    <acpi/>
    <pae/>
  </features>
  <clock offset=3D'utc'/>
  <devices>
    <emulator>/usr/bin/qemu-kvm</emulator>
    <disk type=3D'file' device=3D'disk'>
      <source file=3D'/var/lib/images/centos.5-4.x86-64/centos-small.img'/>
      <target dev=3D'hda' bus=3D'ide'/>
    </disk>
    <interface type=3D'user'>
      <mac address=3D'52:54:00:7e:5b:58'/>
    </interface>
    <interface type=3D'ethernet'>
      <mac address=3D'52:54:00:2e:33:c8'/>
      <script path=3D'/var/lib/images/centos.5-4.x86-64/qemu-ifup'/>
    </interface>
    <graphics type=3D'vnc' port=3D'5910' autoport=3D'no' listen=3D''/>
  </devices>
</domain>

This won't start even when I execute virsh as root:
[root(a)fc12 centos.5-4.x86-64]# virsh -c qemu+unix:///system   create domr=
.xml =

error: Failed to create domain from domr.xml
error: monitor socket did not show up.: No such file or directory
[root(a)fc12 centos.5-4.x86-64]# tail -3 /var/log/libvirt/qemu/centos.log =

LC_ALL=3DC
PATH=3D/sbin:/usr/sbin:/bin:/usr/bin QEMU_AUDIO_DRV=3Dnone
/usr/bin/qemu-kvm -S -M pc-0.11 -m 128 -smp 1 -name centos -uuid
22d9d573-d82c-c18d-36c0-d3ffef057468 -monitor
unix:/var/lib/libvirt/qemu/centos.monitor,server,nowait -boot c -drive
file=3D/var/lib/images/centos.5-4.x86-64/centos-small.img,if=3Dide,index=3D=
0,boot=3Don
-net nic,macaddr=3D52:54:00:7e:5b:58,vlan=3D0,name=3Dnic.0 -net
user,vlan=3D0,name=3Duser.0 -net
nic,macaddr=3D52:54:00:2e:33:c8,vlan=3D1,name=3Dnic.1 -net
tap,script=3D/var/lib/images/centos.5-4.x86-64/qemu-ifup,vlan=3D1,name=3Dta=
p.0
-serial none -parallel none -usb -vnc :10 -vga cirrus =

warning: could not configure /dev/net/tun: no virtual network emulation
qemu: Could not initialize device 'tap'

'***** But I can execute the same command line and it works!!********
[root(a)fc12
centos.5-4.x86-64]# LC_ALL=3DC PATH=3D/sbin:/usr/sbin:/bin:/usr/bin
QEMU_AUDIO_DRV=3Dnone /usr/bin/qemu-kvm -S -M pc-0.11 -m 128 -smp 1 -name
centos -uuid 22d9d573-d82c-c18d-36c0-d3ffef057468 -monitor
unix:/var/lib/libvirt/qemu/centos.monitor,server,nowait -boot c -drive
file=3D/var/lib/images/centos.5-4.x86-64/centos-small.img,if=3Dide,index=3D=
0,boot=3Don
-net nic,macaddr=3D52:54:00:7e:5b:58,vlan=3D0,name=3Dnic.0 -net
user,vlan=3D0,name=3Duser.0 -net
nic,macaddr=3D52:54:00:2e:33:c8,vlan=3D1,name=3Dnic.1 -net
tap,script=3D/var/lib/images/centos.5-4.x86-64/qemu-ifup,vlan=3D1,name=3Dta=
p.0
-serial none -parallel none -usb -vnc :10 -vga cirrus &
[2] 4543

[root(a)fc12 centos.5-4.x86-64]# ps -ef | grep qemu
root      4543  3449  0 19:02 pts/12  =

00:00:00 /usr/bin/qemu-kvm -S -M pc-0.11 -m 128 -smp 1 -name centos
-uuid 22d9d573-d82c-c18d-36c0-d3ffef057468 -monitor
unix:/var/lib/libvirt/qemu/centos.monitor,server,nowait -boot c -drive
file=3D/var/lib/images/centos.5-4.x86-64/centos-small.img,if=3Dide,index=3D=
0,boot=3Don
-net nic,macaddr=3D52:54:00:7e:5b:58,vlan=3D0,name=3Dnic.0 -net
user,vlan=3D0,name=3Duser.0 -net
nic,macaddr=3D52:54:00:2e:33:c8,vlan=3D1,name=3Dnic.1 -net
tap,script=3D/var/lib/images/centos.5-4.x86-64/qemu-ifup,vlan=3D1,name=3Dta=
p.0
-serial none -parallel none -usb -vnc :10 -vga cirrus

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