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xen-devel
Re: [Xen-devel] XenD lost its uniqueness check for names & UUIDs
On Thu, Apr 12, 2007 at 01:51:17AM +0100, Daniel P. Berrange wrote:
> I'm doing some testing against today's xen-unstable.hg and it appears that
> XenD has lost its uniqueness checks for names & UUIDs. eg
>
> # xm create XenGuest2
> Using config file "/etc/xen/XenGuest2".
> Started domain XenGuest2
> # xm create XenGuest2
> Using config file "/etc/xen/XenGuest2".
> Started domain XenGuest2
> # xm create XenGuest2
> Using config file "/etc/xen/XenGuest2".
> Started domain XenGuest2
> # xm list
> Name ID Mem VCPUs State Time(s)
> Domain-0 0 698 2 r----- 2915.3
> XenGuest1 24 394 4 -b---- 32.0
> XenGuest2 32 300 1 r----- 0.3
> XenGuest2 30 300 1 ------ 3.2
> XenGuest2 31 300 1 --p--- 0.0
>
> # xm list --long | grep uuid | sort | uniq -c
> 1 (uuid 00000000-0000-0000-0000-000000000000)
> 1 (uuid c7a5fdb0-cdaf-9455-926a-d65c16db1809)
> 3 (uuid c7a5fdb2-cdaf-9455-926a-d65c16db1809)
>
> So I now have 3 active guests with same name and same UUID :-(
>
> Now it should always be possible to run 'xm new' to define a persistent
> config file for a transient domain, but, attempts to run 'xm create'
> should be rejected if there is an existing domain.
This is slightly more interesting than I first thought - there is a name
uniqueness check being performed, but it only appears to be done if the
UUID's are different. ie, if I have 2 config files with same name, but
different UUIDs, XenD correctly refuses to start the 2nd. If I have 2
config files with same name & same UUID, it happily starts both.
Regards,
Dan.
--
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