On Fri, Aug 11, 2006 at 09:05:12AM -0400, Daniel Veillard wrote: > On Thu, Aug 10, 2006 at 04:28:20PM -0400, Juan Walker wrote: > > On 8/10/06, Daniel Veillard <veillard@xxxxxxxxxx> wrote: > > > Domains have an unique identifier which you can extract: > > > http://libvirt.org/html/libvirt-libvirt.html#virDomainGetUUID > > > > > > Ah, great! Thanks. Is it possible for me to find out the UUID from something > > running on domU? I need to have the application connect to the server and > > identify the information it's sending as being from its specific domain. Any > > ideas? > > Oh, I don't think domU has access to that information, libvirt is meant to be > used on dom0, won't work in domU. Yeah it is not a job for libvirt, but you can get this info within DomU if you are using recent enough Xen tools (xen-unstable / forthcoming Xen 3.0.3) In fully-virt (HVM) guests you can query the SMBIOS for it using DMIDecode. # dmidecode | grep --after 7 'Handle 0x0001' Handle 0x0001 DMI type 1, 25 bytes. System Information Manufacturer: IBM Product Name: 2672JHG Version: ThinkPad X31 Serial Number: KBPKNB2 UUID: EF861801-45B9-11CB-88E3-AFBFE5370493 Incidentally if you want a sensible UUID for Domain0 rather than the one Xen gives (0000000-00000-0000-0000-000000) then you can again use DMIDecode to get the UUID associated with the physical machine - this example above is from my laptop in Domain-0. On para-virt guests you can get the UUID from a file in sysfs: /sys/hypervisor/uuid As I say above though both of these tricks require a fairly recent set of Xen tools from xen-unstable. Failing that you could do some tricks such as passing the UUID on the kernel boot command line when starting the DomU instance and then access that from /proc/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 -=|