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Re: [Qemu-devel] [PATCH 1/1] If user doesn't specify a uuid, generate a


From: Andreas Färber
Subject: Re: [Qemu-devel] [PATCH 1/1] If user doesn't specify a uuid, generate a random one
Date: Mon, 26 Mar 2012 17:21:59 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.2) Gecko/20120215 Thunderbird/10.0.2

Am 26.03.2012 17:13, schrieb Serge E. Hallyn:
> Currently, if the user doesn't pass a uuid, the system uuid is set to
> all zeros.  This patch generates a random one instead.
> 
> Is there a reason to prefer all zeros?

Yes, documented somewhere in the archives, we wanted to have
reproducible defaults in QEMU (cf. MAC address, IP addresses) so that it
doesn't change for each invocation or depending on host.

As a general rule, randomization should be done either explicitly (-uuid
`uuidgen` or -generate-me-a-uuid) or via frontends such as libvirt.

If all zeros causes genuine problems then we should change the default,
taking care of backwards compatibility as usual.

Andreas

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