Re: [Xen-API] trying to get some data out of XenAPI

[Tom Wilkie <tom.wilkie@xxxxxxxxx>]

Hi there

The python bindings 'magically' put in the session variable for you.   
Give it a try without passing the session variable to VM.get_record.
Also, print out the vm_list variable and check its a list of uuids.

Cheers

Tom

On 27 May 2007, at 19:48, Henning Sprang wrote:

> Hi,
> I wanted to try to get some data out of the XenAPI for monitoring a  
> Xen host.
> So, in the end I want ro read some of the host and vm metrics
> (hints on how to get total cpu usage and vm cpu usage would be  
> great - but I guess when i have the first steps this will be  
> obvious). From what I heard and read about the API, this must be  
> very easy.
> But there are no simple examples to get started using the api. The  
> xenapi_create.py seems to operate in a totally different  
> environment - I actually don't really see how it uses the API itself.
> Now I try to get started with the code from Ewan's presenbtation at  
> the Xen summit, and I end up getting this:
> The code I run:
>
> import sys
> sys.path.append('/usr/lib/python')
>
> > from xen.xm.XenAPI import Session
> session = Session('http://localhost:9363/')
> session.login_with_password('henning', 'test')
> print session
> vm_list = session.xenapi.VM.get_all()
> for vm_ref in vm_list:
>         vm_record = session.xenapi.VM.get_record(session, vm_ref)
>         print "VM name:" + vm_record.name_label
>         VM.start(session, vm_ref, false)
>         vbd_list = VM.get_VBDs(session, vm_ref)
>
> But all I get is
>
>
> <ServerProxy for localhost:9363/>
> Traceback (most recent call last):
>   File "xenapi-test.py", line 28, in ?
>     vm_record = session.xenapi.VM.get_record(session, vm_ref)
>   File "/usr/lib/python/xen/xm/XenAPI.py", line 213, in __call__
>     return self.__send(self.__name, args)
>   File "/usr/lib/python/xen/xm/XenAPI.py", line 141, in xenapi_request
>     result = _parse_result(getattr(self, methodname)(*full_params))
>   File "/usr/lib/python/xen/xm/XenAPI.py", line 188, in _parse_result
>     raise Failure(result['ErrorDescription'])
> xen.xm.XenAPI.Failure: The VM handle {'last_login_method':  
> 'login_with_password', '_ServerProxy__transport': {'verbose': 0},  
> '_ServerProxy__handler': '/', '_ServerProxy__host': 'localhost: 
> 9363', '_ServerProxy__verbose': 0, '_ServerProxy__allow_none': 1,  
> '_session': 'b11780a0-0bd1-a60d-7537-be5da410fb3a',  
> '_ServerProxy__encoding': None, 'last_login_params': ['henning',  
> 'test']} is invalid.
>
> My authentication is set to "none" in the xend config - so any  
> login should be working. I also tried if there is a method login()  
> without any password, but failed, I also tried using two emtpy  
> strings for logging in, and, last but not least, I tried to use pam  
> authentication, but always got wrong password errors. There seem to  
> be missing something here.
> Henning
>
>
>
>
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