Re: [libvirt] Unable to get libvirt working with KVM using direct kernel boot.
On Mon, Jul 27, 2009 at 03:07:38PM +0300, Tiit Kaeeli wrote:
Hi,
I am trying to get libvirt to manage a KVM virtual machine on Debian
squeeze with multiple relevant parts included form unstable (because of
need for gpt partition tables, Intel 82576 nic etc).
Unfortunately the VM does not seem to boot. I will see a quemu prompt on
/dev/pts/1. (Tried pressing c on it, but no difference). Nothing will
appear on /dev/pts/2, /dev/pts/3 or when I type
virsh console vm1_storage.
If I grab the kvm command line generated by libvirt using ps and run it
manually, it works fine. (Starts booting after I press c on /dev/pts/1 or
remove the -S option from the command line)
libvirt does this automatically, it starts it with -S, does a few things
to configure the VM, then runs 'cont' to let CPUs start.
Libvirt configuration file:
<domain type='kvm'>
<name>vm1_storage</name>
<uuid>29bfac01-b24d-e4ab-e741-f33f7e880d9d</uuid>
<memory>4096000</memory>
<currentMemory>4096000</currentMemory>
<vcpu>6</vcpu>
Always worth setting vcpu=1 just to eliminate SMP as a cause
of trouble.
<os>
<type>hvm</type>
<kernel>/boot/vmlinuz-2.6.30-1-amd64</kernel>
<initrd>/boot/initrd.img-2.6.30-1-amd64</initrd>
<cmdline>"root=UUID=98d6d3d7-3782-4f6b-a94f-bc0272c0289d ro
console=tty0 console=ttyS0,115200n8"</cmdline>
</os>
You don't have any <graphics> configured, so console=tty0 is not
applicable there - only get a serial console on ttyS0 with this
XML config.
<features>
<acpi/>
<pae/>
</features>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<devices>
<emulator>/usr/bin/kvm</emulator>
<disk type='block' device='disk'>
<source dev='/dev/vm_lvm/vm01_storage_root'/>
<target dev='vda' bus='virtio'/>
</disk>
<interface type='ethernet'>
<mac address='52:54:00:12:34:56'/>
<target dev='tap0'/>
</interface>
Worth trying to remove the etherenet device too to see if that's
a cause of trouble.
<serial type='pty'>
<target port='0'/>
</serial>
<console type='pty'>
<target port='0'/>
</console>
</devices>
</domain>
[snip]
Versions in use:
kvm 85+dfsg-4
kvm 85 is a development snapshot release from upstream KVM. IIRC kvm-85
was a particularly buggy one. You should try other KVM versions, either
kvm-86/87, etc or better yet, one from the stable upstream releaxe
series qemu-kvm-0.10.x
Regards,
Daniel
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