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[Xen-devel] Error getting VM-informations with Python on Xen 3.0.2

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Subject: [Xen-devel] Error getting VM-informations with Python on Xen 3.0.2
From: Thorolf Godawa <Thorolf@xxxxxxxxx>
Date: Wed, 05 Apr 2006 21:24:09 +0200
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Hi all,

I wrote a small python-script to monitor the status of the started VMs based on the xenmon.py and the following code I got from Anthony Liguori:

import sys

from xen.xend.XendClient import server
from xen.xend import sxp

def parse_doms_info(info):
    def get_info(n, t, d):
        return t(sxp.child_value(info, n, d))

    return {
        'dom'      : get_info('domid',        int,   -1),
        'name'     : get_info('name',         str,   '??'),
        'mem'      : get_info('memory',       int,   0),
        'vcpus'    : get_info('online_vcpus', int,   0),
        'state'    : get_info('state',        str,   '??'),
        'cpu_time' : get_info('cpu_time',     float, 0),
        'ssidref'  : get_info('ssidref',      int,   0),

doms = server.xend_list_domains()

print 'Name                              ID Mem(MiB) VCPUs State  Time(s)'
for dom in doms:
    d = parse_doms_info(dom)
    if (d['ssidref'] != 0):
        d['ssidstr'] = (" s:%04x/p:%04x" %
                        ((d['ssidref'] >> 16) & 0xffff,
                          d['ssidref']        & 0xffff))
        d['ssidstr'] = ""
print ("%(name)-32s %(dom)3d %(mem)8d %(vcpus)5d %(state)5s% (cpu_time)7.1f% (ssidstr)s" % d)

I wrote the script on SUSE SLES 10.0 Beta 3 with Xen 3.0_8659-2. Unfortunately this script (and therefor my one too) ist not running anymore with the latest SUSE SLES 10.0 Beta 9 that includes Xen 3.0.2_09434-2 :-(

It breaks at line "doms = server.xend_list_domains()" with the following error:

Traceback (most recent call last):
  File "xentest1.py", line 22, in ?
    doms = server.xend_list_domains()
  File "/usr/lib/python2.4/xmlrpclib.py", line 1096, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib/python2.4/xmlrpclib.py", line 1383, in __request
File "/usr/lib/python2.4/site-packages/xen/util/xmlrpclib2.py", line 46, in request
    return Transport.request(self, host, '/RPC2', request_body, verbose)
  File "/usr/lib/python2.4/xmlrpclib.py", line 1147, in request
    return self._parse_response(h.getfile(), sock)
  File "/usr/lib/python2.4/xmlrpclib.py", line 1286, in _parse_response
    return u.close()
  File "/usr/lib/python2.4/xmlrpclib.py", line 744, in close
    raise Fault(**self._stack[0])
xmlrpclib.Fault: <Fault 1: 'Traceback (most recent call last):\n File "/usr/lib/python2.4/site-packages/xen/util/xmlrpclib2.py", line 74, in _marshaled_dispatch\n response = self._dispatch(method, params)\n File "/usr/lib/python2.4/SimpleXMLRPCServer.py", line 408, in _dispatch\n raise Exception(\'method "%s" is not supported\' % method)\nException: method "xend_list_domains" is not supported\n'>

If I see right it now uses "/usr/lib/python2.4/SimpleXMLRPCServer.py" (what does not exist in Xen 3.0_8659-2) and breaks because the method "xend_list_domains" is not supported anymore I use to get the domain-informations with the script.

Is there a better way to get the VM-status like name, memory, state, CPU-usage etc. via Python than using the mechanism from xenmon.py and the above one?

Thanks a lot for your answers,

Chau y hasta luego,


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