On 05/04/2012 02:28 PM, John Wayne wrote:
i am trying to get the free memory on a hypervisor using libvert, with the 
python api bindings
as per http://libvirt.org/python.html, it should be pretty easy, however the 
below is failing:

#conn is a connection object
freemem=libvirt.virNode.getFreeMemory(conn)
There are 2 wrongs in here, the first, libvirt module hasn't 'virNode' class, it should be 'virNodeDevice'; the second, 'virNodeDevice' class hasn't 'getFreeMemory' method, which belongs to 'virConnect' class,
so it should like this:
>>> import libvirt
>>> conn = libvirt.open(None)
>>> conn.getFreeMemory()
228167680L

or

>>> libvirt.virConnect.getFreeMemory(conn)
227864576L

You may use 'dir' to list all of class/method of libvirt/sub-class:

>>>dir(libvirt)
>>>dir(libvirt. virConnect)

although this works fine:

software=libvirt.virConnect.getType(conn)
if software ==  'QEMU':
logging.debug('hypervisor is type QEMU')

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