libvirt users - Feb 2011 - How to use Python Binding with Lbivirt.

HI,

I am using ubuntu host machine and KVM is present as guest in that
machine.Two virtual machines are there.I am using Python binding to query on
the hypervisor and extract the VM related information.

Here is my  simple code:


#!/*usr*/local/bin/*python
*

import libvirt

import sys

conn = libvirt.openReadOnly(None)

if conn == None:

print *'Failed to open connection to the hypervisor'
*

sys.exit(1)

try:

domIds = conn.listDomainsID()

for id in domIds:

dom0 = conn.lookupByID(id)

dom0.info()

print *"Domain 0: id %d running %s"* % (dom0.ID(), dom0.OSType())

print dom0.info()

except:

print *'Failed to find the main domain'
*

sys.exit()
The output is :

Domain 0: id 2 running hvm
[1, 131072L, 131072L, 1, 14921710000000L]
Domain 0: id 3 running hvm
[1, 131072L, 131072L, 1, 30880000000L]

Here I am not able to understand these values are represent what type of
information, which value is representing what resource of host machine.Could
you please help me to understand how I could find out CPU,VM ,memory related
information seperately through python binding?.
I didn't find Python binding Reference in the Libvirt site.Could you help me
by providing the Reference link for Python binding?

Thanks in Advance!!

Arpita
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Arpita,

        I have used the python bindings extensively, but AFAIK there is no
        documentation specifically for python. The python bindings closely
        follow the C API, which is documented here:

        http://libvirt.org/html/libvirt-libvirt.html

        The function names in python will closely mirror the names listed in
        that document. For instance, when you are calling 'dom0.info()'
you
        are really calling 'virDomainGetInfo' -- you leave out the
domain
        pointer because you are calling the function on a domain object, and
        you leave out the info pointer because in python you can just get
        that back as a return value.

        The list you're getting from 'info()' is just this structure
here:

        http://libvirt.org/html/libvirt-libvirt.html#virDomainInfo

        If you get stuck, I recommend getting a connection or domain object
        inside a python interpreter and calling dir() or help() on that
        object. This can reveal other things to play with.


        >>> import libvirt
        >>> c = libvirt.open(None)
        >>> dir(c)
        >>> d = c.lookupByID(0)
        >>> help(d)

--igor

On Wed, Feb 09, 2011 at 04:48:07PM +0530, arpita k
wrote:
> HI,
> 
> I am using ubuntu host machine and KVM is present as guest in that
> machine.Two virtual machines are there.I am using Python binding to query
on
> the hypervisor and extract the VM related information.
> 
> Here is my  simple code:
> 
> 
> #!/*usr*/local/bin/*python
> *
> 
> import libvirt
> 
> import sys
> 
> conn = libvirt.openReadOnly(None)
> 
> if conn == None:
> 
> print *'Failed to open connection to the hypervisor'
> *
> 
> sys.exit(1)
> 
> try:
> 
> domIds = conn.listDomainsID()
> 
> for id in domIds:
> 
> dom0 = conn.lookupByID(id)
> 
> dom0.info()
> 
> print *"Domain 0: id %d running %s"* % (dom0.ID(), dom0.OSType())
> 
> print dom0.info()
> 
> except:
> 
> print *'Failed to find the main domain'
> *
> 
> sys.exit()
> The output is :
> 
> Domain 0: id 2 running hvm
> [1, 131072L, 131072L, 1, 14921710000000L]
> Domain 0: id 3 running hvm
> [1, 131072L, 131072L, 1, 30880000000L]
> 
> Here I am not able to understand these values are represent what type of
> information, which value is representing what resource of host
machine.Could
> you please help me to understand how I could find out CPU,VM ,memory
related
> information seperately through python binding?.
> I didn't find Python binding Reference in the Libvirt site.Could you
help me
> by providing the Reference link for Python binding?
> 
> Thanks in Advance!!
> 
> Arpita
> _______________________________________________
> libvirt-users mailing list
> libvirt-users at redhat.com
> https://www.redhat.com/mailman/listinfo/libvirt-users
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