In all cases these are CentOS boxes. The 3.0.x boxes are still in CentOS6.x land but the 4.1 Cloudstack boxes are 6.4+updates (as of 6months ago).
I don't know if the UUID internal to the VM is generated by cloudstack, libvirtd, or qemu-kvm. Since the mac addresses have never had a collision I suspect the UUID is random with a common seed. Just not sure what piece is doing creating the UUID for a fresh VM. On Mon, Dec 9, 2013 at 10:04 PM, Chiradeep Vittal < [email protected]> wrote: > What is the OS of the KVM host? > I believe vm uuids are type 4 uuids and are hence independent of time. > http://docs.oracle.com/javase/6/docs/api/java/util/UUID.html > > > > On 12/9/13 12:01 PM, "Bryan Whitehead" <[email protected]> wrote: > > >I have 3 independent Cloudstack installs. One is 3.0.x and the others are > >4.1.0. > > > >Using KVM (i'm only using KVM so I don't have anything else for > >comparison), between 3.0.x and 4.1.0 I'm getting instances with UUID's > >that > >are the same. > > > >I get the UUID by running this on the console (CentOS): > > > >dmidecode -s system-uuid > > > >Here is example output from 1 host: > >[root@fortress ~]# dmidecode -s system-uuid > >C1260F04-F171-3136-85A7-F0B77699DA33 > >[root@fortress ~]# ifconfig eth0 > >eth0 Link encap:Ethernet HWaddr 06:9A:36:00:00:AF > > inet addr:removed Bcast:70.33.251.255 Mask:255.255.255.0 > > inet6 addr: fe80::49a:36ff:fe00:af/64 Scope:Link > > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > > RX packets:20586 errors:0 dropped:0 overruns:0 frame:0 > > TX packets:1796 errors:0 dropped:0 overruns:0 carrier:0 > > collisions:0 txqueuelen:1000 > > RX bytes:1764556 (1.6 MiB) TX bytes:197329 (192.7 KiB) > > > > > >here is another: > >[root@db-sla01 ~]# dmidecode -s system-uuid > >C1260F04-F171-3136-85A7-F0B77699DA33 > >[root@db-sla01 ~]# ifconfig eth0 > >eth0 Link encap:Ethernet HWaddr 06:5E:9A:00:00:C9 > > inet addr:removed Bcast:64.13.168.255 Mask:255.255.255.0 > > inet6 addr: fe80::45e:9aff:fe00:c9/64 Scope:Link > > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > > RX packets:7644414 errors:0 dropped:0 overruns:0 frame:0 > > TX packets:3073765 errors:0 dropped:0 overruns:0 carrier:0 > > collisions:0 txqueuelen:1000 > > RX bytes:735505477 (701.4 MiB) TX bytes:519743789 (495.6 MiB) > > > >NOTE: The IP's are not in the same nor in the same subnet > > > >The time between creation is pretty long... weeks. > > > >Any ideas? > > > >I've just been killing VM's that have collisions with UUID's but it > >happens > >pretty often. > > > >-Bryan > >
