[libvirt-users] Fwd: Re: New with Libvirt and having problems.
On 8/29/2011 10:29 PM, Trey Dockendorf wrote:
Have you looked into using virt-manager? When I started using KVM I
found that new VM provisioning was much simpler with that interface.
Alas, Virtmanager doesn't seem to be a supported program under Gentoo -
the distribution I use. If its X-based, it wouldn't work anyhow - I'm
strictly a command line shop.
Once you've created your domain with "virt-install" you can make
changes using virsh.
virsh -c qemu:///system edit Test
That will allow you to directly edit the domain.
In the virt-install line you used "bridge=br0" , maybe replace that
with "bridge=tap5". If that doesn't do it, once your editing the XML
you can try something like the following...
I'm familiar with virsh edit and have used it to probe around a bit.
Actually tried the "bridge=tap5" a few days ago and get the message:
/ERROR internal error Failed to add tap interface to bridge. tap5 is
not a bridge device/
<interface type='bridge'>
<mac address='52:54:00:4d:74:c7'/>
<source bridge='tap5'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x03'
function='0x0'/>
</interface>
That was created using virt-manager, so you probably need to use what
virt-install created for your mac address and address.
Gave that a shot, attempting to create a new domain with "br0" replaced
by "tap5" and got the same error message:
/error: internal error Failed to add tap interface to bridge. tap5 is
not a bridge device/
Is your init failing on /dev/vda3 and then kernel panic? If so it's
likely your guest OS doesn't have the necessary kernel modules loaded.
Depending on your distro it will vary, but using CentOS 6 I've found
they are automatically loaded. This is what's loaded in CentOS 6
Well, yes and no. Its failing with a kernel panic because KVM is being
started with if=none instead of if=virtio. If I manually change it, it
works fine. Just need to know where to update that in the domain XML file.
For what its worth, the image runs 100% fine with started manually with:
/kvm -net nic,model=virtio -net tap,ifname=tap5,script=no -drive
file=test1.img,if=virtio,boot=on -curses -no-reboot -m 2g -smp 2/
So I know the image is good.
# lsmod | grep virtio
virtio_blk 5087 5
virtio_pci 6733 0
virtio_ring 7169 2 virtio_blk,virtio_pci
virtio 4824 2 virtio_blk,virtio_pci
Try changing the disk to ide , and then verifying your system is able
to load the virtio modules.
Also , once you have your XML the way you like, if your going to stick
with command line look at using virsh though I highly recommend
virt-manager.
I'm still very new to KVM myself, so hopefully that was of some use
- Trey
Thanks!
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