KVM guests unique ID

 
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Special Forums UNIX and Linux Applications Virtualization and Cloud Computing KVM guests unique ID
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Old 07-28-2014
KVM guests unique ID

Hi,
I wanted to know if there was a way to get a unique UUID for KVM guest from the guest OS which isn't easily modifiable. I have a software that I would like to run inside a KVM guest and want to do some license protection on it using a unique UUID. Does KVM allow multiple VMs on the same machine with same UUID. I mean if someone edits the configuration file of the VM manually from the host, would it still bring up the VM if the uuid was duplicated ? Also how can I get the uuid of a guest VM from the guest ?

Also if someone could throw some light on guest host communication channel. Is there an equivalent of Xenstore or guest property store in KVM ? Some mechanism to share small messages between the guest and the host.

Thanks
Shivani
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SYSTEMD-MACHINE-ID(1)					     systemd-machine-id-setup					     SYSTEMD-MACHINE-ID(1)

NAME
systemd-machine-id-setup - Initialize the machine ID in /etc/machine-id SYNOPSIS
systemd-machine-id-setup DESCRIPTION
systemd-machine-id-setup may be used by system installer tools to initialize the machine ID stored in /etc/machine-id at install time with a randomly generated ID. See machine-id(5) for more information about this file. This tool will execute no operation if /etc/machine-id is already initialized. If a valid D-Bus machine ID is already configured for the system the D-Bus machine ID is copied and used to initialize the machine ID in /etc/machine-id. If run inside a KVM virtual machine and a UUID is passed via the -uuid option this UUID is used to initialize the machine ID instead of a randomly generated one. The caller must ensure that the UUID passed is sufficiently unique and is different for every booted instanced of the VM. Similar, if run inside a Linux container environment and a UUID is set for the container this is used to initialize the machine ID. For details see the documentation of the Container Interface[1]. OPTIONS
This tool does not take any options or arguments. EXIT STATUS
On success 0 is returned, a non-zero failure code otherwise. SEE ALSO
systemd(1), machine-id(5), dbus-uuidgen(1) AUTHOR
Lennart Poettering <lennart@poettering.net> Developer NOTES
1. Container Interface http://www.freedesktop.org/wiki/Software/systemd/ContainerInterface systemd 10/07/2013 SYSTEMD-MACHINE-ID(1)