Xen users - Nov 2008 - How domU could guess about its dom0?

Hurding multiple domUs on several Dom0 farms, sometimes, we need to gather
actual info on de-facto dom0-domUs relationship. It could become a complicated
task if a Dom0 is missing the list and only DomUs are well-known. Is there any
method a DomU can get the hostname of its Dom0? We usually use PV Linux as DomU.


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That should not be possible. In the domU space, dom0 doesn''t exist.
Think of it as being the Matrix.

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2008/11/7 Sergey Lukashevich <lukash33@mail.ru>
>
> Hurding multiple domUs on several Dom0 farms, sometimes, we need to gather
> actual info on de-facto dom0-domUs relationship. It could become a
> complicated task if a Dom0 is missing the list and only DomUs are
> well-known. Is there any method a DomU can get the hostname of its Dom0? We
> usually use PV Linux as DomU.

We solve that indirectly by writing a service like script that runs on every
dom0 and that produces a XML file describing the domU running on this dom0
regularly (every two minutes in our case). The XML data is written on a NFS
share, accessable from all dom0s and eventually by any machine, including
some domUs.

We use this XML data to maintain some HTML pages that describe dom0s, domUs
and their relationships. Another script allows to query the XML data to
locate a particular domU or a particular virtual block device.

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