Hello,
As part of a research project on cloud management, I am developing
software to create on-demand networks between VMs on different hosts.
The deployment of the VMs themselves is done by OpenNebula, but for the
management of the networks I have to bypass OpenNebula, and I talk
directly with libvirt.
One of the features of our network management is that we allow network
connections to be created and destroyed at any moment in the life of a
VM. This means that we use hotplugging. It also means that we want a VM
to discover its network parameters for a particular NIC using DHCP and DNS.
I have something that mostly works now: I create an XML for each
network, I can hot-plug new NICs in the VM using libvirt, and DHCP on
the new interface works. However, DNS does not work properly. I have to
create a mapping between the MAC, IP address, and the name of a VM at
the moment I create the network XML. Setting the MAC <-> IP mapping at
that time is fine, but fixing the mapping between IP address and name at
that time is not reasonable. I do not know what name will be used before
I add a new machine, and during the lifetime of the network there may
even be different names associated with a particular IP address.
Is there a way I can change/update the DNS configuration of a network
after it has been created? I could simply create a new network XML file
and stop/start the network, but I suspect that is too disruptive. Is
there a less intrusive way to do this?
Another thing I would very much like to do is to talk to libvirt
directly from my management software (written in Java), rather than
through the command line. I know there is a Java API for libvirt, but I
have not been able to find any up-to-date documentation on it. Is the
functionality that I need accessible through the Java API? Is there
enough documentation of the API for this, and where is it?
--
Dr. Ir. Kees van Reeuwijk, Vrije Universiteit Amsterdam
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