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