[libvirt-users] How to use Python Binding with Lbivirt.

[Igor Serebryany]

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

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