通过libvirt获取对虚拟机的监控数据

最新推荐文章于 2023-03-17 14:30:17 发布

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最新推荐文章于 2023-03-17 14:30:17 发布 · 5.2k 阅读

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CC 4.0 BY-SA版权

本文介绍如何借助libvirt库在版本1.1.2及以上获取虚拟机的内存监控数据，特别是针对Linux系统的应用。

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import collections
from lxml import etree
import json
import threading
import time
libvirt = None
libvirt_type = 'kvm'
libvirt_uri = ''
Instance = collections.namedtuple('Instance', ['name', 'UUID', 'state'])
CPUStats = collections.namedtuple('CPUStats', ['number', 'util'])
Interface = collections.namedtuple('Interface', ['name', 'mac',
                                                 'fref', 'parameters'])
InterfaceStats = collections.namedtuple('InterfaceStats',
                                        ['rx_bytes', 'rx_packets',
                                        'tx_bytes', 'tx_packets'])
Disk = collections.namedtuple('Disk', ['device'])
DiskStats = collections.namedtuple('DiskStats',
                                   ['read_bytes', 'read_requests',
                                    'write_bytes', 'write_requests',
                                    'errors'])
DiskSize = collections.namedtuple('DiskSize',['total','allocation','physical'])
Memory = collections.namedtuple('Memory',['total','used','util'])
class InspectorException(Exception):
    def __init__(self, message=None):
        super(InspectorException, self).__init__(message)
class InstanceNotFoundException(InspectorException):
    pass
class LibvirtInspector():
    per_type_uris = dict(uml='uml:///system', xen='xen:///', lxc='lxc:///')
    def __init__(self):
        self.uri = self._get_uri()
        self.connection = None
    def _get_uri(self):
        return libvirt_uri or self.per_type_uris.get(libvirt_type,
                                                          'qemu:///system')
    def _get_connection(self):
        if not self.connection or not self._test_connection():
            global libvirt
            if libvirt is None:
                libvirt = __import__('libvirt')
           # LOG.debug('Connecting to libvirt: %s', self.uri)
            self.connection = libvirt.open(self.uri)
        return self.connection
    def _test_connection(self):
        try:
            self.connection.getCapabilities()
            return True
        except libvirt.libvirtError as e:
            if (e.get_error_code() == libvirt.VIR_ERR_SYSTEM_ERROR and
                e.get_error_domain() in (libvirt.VIR_FROM_REMOTE,
                                         libvirt.VIR_FROM_RPC)):
               # LOG.debug('Connection to libvirt broke')
                return False
            raise
    def _lookup_by_name(self, instance_name):
        try:
            return self._get_connection().lookupByName(instance_name)
        except Exception as ex:
            if not libvirt or not isinstance(ex, libvirt.libvirtError):
                raise InspectorException(unicode(ex))
            error_code = ex.get_error_code()
            msg = ("Error from libvirt while looking up %(instance_name)s: "