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Thread: KVM Networking guest not working

  1. #1
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    Default KVM Networking guest not working

    Following configuration:

    host server opensuse 11.4_x64 running KVM (whatever version comes on the
    11.4 DVD)

    guest server opensuse 11.4_x64

    host networking is working.
    guest does not

    Bridge networking was selected at install time.
    IP information and DNS triple checked.
    Guest and Host Firewalls are disabled.
    IPv6 disabled on guest and host.

    Any ideas?

    Thanks.

  2. #2
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    Default Re: KVM Networking guest not working

    For some reason the bridge was not created.

    'brctl show' has no contents.



  3. #3

    Default Re: KVM Networking guest not working

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    Until I started the libvirtd service I didn't have one either. Possibly
    related?

    sudo /etc/init.d/libvirtd start

    Good luck.


    - --
    Want to yell at me in person?
    Come to BrainShare 2011 in October: http://tinyurl.com/brainshare2011
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  4. #4
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    Default Re: KVM Networking guest not working

    Unfortunately no. libvirtd is running. I had to manually enable it to even
    open the GUI apps. I created a bridge using YaST but it is not bound to
    eth0. The YaST GUI provides no means for connecting it. I'm at a loss.
    Clicking on the Help button gives a blank window. Nice.
    VMware handled all of this backend business...Get what you pay for I guess.
    There are a hundred tutorials online and they all differ. Most involve heavy
    mucking in the shell which I have learned in the past is a good way to get
    your config overwritten later.




  5. #5

    Default Re: KVM Networking guest not working

    I wrote a script to create/delete bridges on the fly and convert virtual machines form nat to bridge and vice versa: vm-bridge : convert virtual machines from NAT to bridge or bridge to NAT. I usually just execute nat2bridge without argument to create a bridge on the host default network interface before starting a guest (if the bridge is not present, you'll get an error message and the guest won't start).

    Here's another script to create vms on anywhere from anywhere which might interest you: vm-create : create kvm virtual machines - It would need to some updating though.

    I use both scripts under openSUSE, Fedora, Ubuntu ArchLinux and Mandriva hosts - although I haven't for a while and constantly update libvirt ... so maybe I should take a closer look before posting (?). But nat2bridge should be fine.

  6. #6
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    Default Re: KVM Networking guest not working

    Hmm I'll give that a go.
    I built the bridge last night according to

    http://www.howtoforge.com/virtualiza...se-11.4-server

    but it was still not working when I retired last night.



  7. #7
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    Default Re: KVM Networking guest not working

    Right...script worked.

    I had to delete the virtual network device first using VirtManager and get
    rid of all the munging that I had done. One thing I noticed is that virbr0
    is still configured. Is that a normal effect? I read here:

    http://www.cyberciti.biz/faq/linux-k...nat-interface/

    That it should probably be removed since I am not using NAT.



  8. #8

    Default Re: KVM Networking guest not working

    On the openSUSE server in front of me, it is gone. On another openSUSE server that I cannot reboot now, it is still there - but I haven't rebooted it for a while. On an ArchLinux server that I just booted, it is there. I noticed the file /etc/libvirt/qemu/networks/default.xml on all machines, but on the Arch machine, there is also a symlink /etc/libvirt/qemu/networks/autostart/default.xml -> ../default.xml.
    The command
    Code:
    virsh net-undefine default
    deletes the file /etc/libvirt/qemu/networks/default.xml and the virtual network device. Maybe it was removed on openSUSE by one of the many libvirt updates. Right now I have libvirt 0.9.4 and qemu 0.14.1.

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