On Wed, Sep 12, 2007 at 12:17:58PM -0700, Evan Bigall wrote: > I'm having a problem using libvirt to manage "defined" domains (ie: > domains for which it has XML, but are not running.) > > I have tried several debugging scenarios, but the simplest one is this. > In a libvirt C program I define the following XML: > > char domxml[]="<domain type='xen' id='99'>" > "<name>rhel5vm</name>" > "<uuid>f948d7f4f36c4bfae8053bca535183b3</uuid>" > "<os>" > "<type>linux</type>" > "<kernel>/var/lib/xen/boot/rhel5vm/vmlinuz-2.6.18-8.el5xen</kernel>" > > "<initrd>/var/lib/xen/boot/rhel5vm/initrd-2.6.18-8.el5xen.img</initrd>" > "<root>/dev/xvda1</root>" > "</os>" > "<memory>512000</memory>" > "<vcpu>1</vcpu>" > "<on_poweroff>destroy</on_poweroff>" > "<on_reboot>restart</on_reboot>" > "<on_crash>restart</on_crash>" > "<devices>" > "<interface type='bridge'>" > "<source bridge='xenbr0'/>" > "<mac address='00:16:3e:09:ef:b0'/>" > "<script path='vif-bridge'/>" > "</interface>" > "<disk type='block' device='disk'>" > "<driver name='phy'/>" > "<source dev='/dev/sda3'/>" > "<target dev='xvda'/>" > "</disk>" > "<console tty='/dev/pts/2'/>" > "</devices>" > "</domain>"; > > (I've played with several values for the domain id). The 'id' field is not needed when defining a new VM - it is automatically allocated by the Xen HV. Including it is harmless though - it'll simply be ignored when defining a VM. > What I find is that when I use virDomainDefineXML() to define the domain, > for some reason it drops, the "root" element from the "os" specification. > Because of this the domain then crashes when I try to start it. Yes, this looks like a bug in the way libvirt handles the <root> element. In fact I didn't even realize we had a 'root' element! The XML parser will accept the root tag, but the code which converst from XenD -> XML does not include the root element. As a workaround, it should work if you use the alternate cmdline tag, eg <cmdline>root=/dev/xvda1</cmdline> Regards, Dan. -- |=- Red Hat, Engineering, Emerging Technologies, Boston. +1 978 392 2496 -=| |=- Perl modules: http://search.cpan.org/~danberr/ -=| |=- Projects: http://freshmeat.net/~danielpb/ -=| |=- GnuPG: 7D3B9505 F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 -=| -- Libvir-list mailing list Libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list