Re: [libvirt-users] How to list and change domain's disk image file
On 06/11/2012 08:20 PM, Ricardo Hillbrecht wrote:
Hi
I'm writing a C program using libvirt API and need to list the storage
volumes used by each domain. I'm wondering if there is a way to do
this better of searching the XML strings of all domains, does anyone
can suggest me something ?
Parsing the XML is the current method of doing this. I have plans of
someday adding a new API that returns a list of virStorageVolPtr
corresponding to a given domain, but that's still a ways down the road.
I also need to create a function to change the img file of a given
domain. I intend to do the following:
1. virDomainGetXMLDesc (domain)
2. change the XML to other img file
3. virDomainUndefine (domain)
You can skip this step (it is okay to redefine an existing domain).
4. virDomainCreateXML (changed XML)
Am i correct doing this ? There is a better method ?
You are doing it correctly for affecting the next boot; and this is how
programs like virt-manager do it. If you want the changes to take place
while the domain is live, then you will have to use the hotplug APIs
such as virDomainDeviceModify.
--
Eric Blake eblake(a)redhat.com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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