[libvirt] libvirt will create two guest with the same name, but with different UUIDs

[Kaitlin Rupert]

Hi,

libvirt allows you to create two guests with same name, but with 
different UUIDs.

This causes some problems in the reporting though. virsh will report 
that a guest is running (when it isn't). This also causes some confusion 
for the dominfo call - virsh will only return info for one of the 
guests.  I've seen similar issues when using the virDomainLookupByName() 
API.

I suspect all the issues are the same bug, but I haven't had a chance to 
  track down where.

Thanks!

# virsh version
Compiled against library: libvir 0.6.3
Using library: libvir 0.6.3
Using API: QEMU 0.6.3
Running hypervisor: QEMU 0.9.1

# virsh list --all
  Id Name                 State
----------------------------------
109 demo2                running
   - domU1                shut off
   - test_domain          shut off

# virsh dumpxml demo2
<domain type='kvm' id='109'>
   <name>demo2</name>
   <uuid>4dea24b3-1d52-d8f3-2516-782e98a23fa0</uuid>
   <memory>131072</memory>
   <currentMemory>131072</currentMemory>
   <vcpu>1</vcpu>
   <os>
     <type arch='i686' machine='pc'>hvm</type>
     <boot dev='hd'/>
   </os>
   <clock offset='utc'/>
   <on_poweroff>restart</on_poweroff>
   <on_reboot>restart</on_reboot>
   <on_crash>restart</on_crash>
   <devices>
     <emulator>/usr/bin/qemu-kvm</emulator>
     <disk type='file' device='disk'>
       <source file='/tmp/default-kvm-dimage'/>
       <target dev='hda' bus='ide'/>
     </disk>
     <interface type='user'>
       <mac address='24:42:53:21:52:45'/>
     </interface>
     <input type='mouse' bus='ps2'/>
     <graphics type='vnc' port='5900' autoport='yes'/>
   </devices>
</domain>

# cat demo2
<domain type='kvm' id='55'>
   <name>demo2</name>
   <uuid>4dea24b3-1d52-d8f3-2516-782e98a23fa3</uuid>
   <memory>131072</memory>
   <currentMemory>131072</currentMemory>
   <vcpu>1</vcpu>
   <os>
     <type arch='i686' machine='pc'>hvm</type>
     <boot dev='hd'/>
   </os>
   <clock offset='utc'/>
   <on_poweroff>restart</on_poweroff>
   <on_reboot>restart</on_reboot>
   <on_crash>restart</on_crash>
   <devices>
     <emulator>/usr/bin/qemu-kvm</emulator>
     <disk type='file' device='disk'>
       <source file='/tmp/default-kvm-dimage'/>
       <target dev='hda' bus='ide'/>
     </disk>
     <interface type='user'>
       <mac address='24:42:53:21:52:45'/>
     </interface>
     <input type='mouse' bus='ps2'/>
     <graphics type='vnc' port='5902' autoport='yes'/>
   </devices>
</domain>

# virsh define demo2
Domain demo2 defined from demo2

# virsh list --all
  Id Name                 State
----------------------------------
109 demo2                running
   - demo2                running
   - domU1                shut off
   - test_domain          shut off

# ps -ef | grep qemu
root     11464     1 96 09:04 ?        00:02:12 /usr/bin/qemu-kvm -S -M 
pc -cpu qemu32 -m 128 -smp 1 -name demo2 -uuid 
4dea24b3-1d52-d8f3-2516-782e98a23fa0 -monitor pty -pidfile 
/var/run/libvirt/qemu//demo2.pid -no-acpi -boot c -drive 
file=/tmp/default-kvm-dimage,if=ide,index=0,boot=on -net 
nic,macaddr=24:42:53:21:52:45,vlan=0 -net user,vlan=0 -serial none 
-parallel none -usb -vnc 127.0.0.1:0
root     11483 27407  0 09:06 pts/1    00:00:00 grep qemu
#



-- 
Kaitlin Rupert
IBM Linux Technology Center
kaitlin at linux.vnet.ibm.com