Basic fencenode functions
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fencenode.py
229
fencenode.py
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#!/usr/bin/env python3
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# fencenode.py - Supplemental functions to handle fencing of nodes
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# fencenode.py - Supplemental functions to handle fencing of dead nodes
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# Part of the Parallel Virtual Cluster (PVC) system
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#
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# Copyright (C) 2018 Joshua M. Boniface <joshua@boniface.me>
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@ -20,227 +20,12 @@
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#
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###############################################################################
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import os, sys, libvirt, uuid, kazoo.client, lxml.objectify, click
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import os, sys, libvirt, uuid, kazoo.client, time
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#
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# Validate a UUID
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# Trigger function
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#
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def validateUUID(dom_uuid):
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try:
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uuid.UUID(dom_uuid)
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return True
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except:
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return False
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#
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# Connect and disconnect from Zookeeper
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#
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def startZKConnection(zk_host):
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zk = kazoo.client.KazooClient(hosts=zk_host)
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zk.start()
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return zk
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def stopZKConnection(zk):
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zk.stop()
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zk.close()
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return 0
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#
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# XML information parsing functions
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#
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def getInformationFromXML(zk, uuid, long_output):
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# Obtain the contents of the XML from Zookeeper
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try:
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xml = zk.get('/domains/%s/xml' % uuid)[0].decode('ascii')
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dstate = zk.get('/domains/%s/state' % uuid)[0].decode('ascii')
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dhypervisor = zk.get('/domains/%s/hypervisor' % uuid)[0].decode('ascii')
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dlasthypervisor = zk.get('/domains/%s/lasthypervisor' % uuid)[0].decode('ascii')
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except:
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return None
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if dlasthypervisor == '':
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dlasthypervisor = 'N/A'
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# Parse XML using lxml.objectify
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parsed_xml = lxml.objectify.fromstring(xml)
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# Get the information we want from it
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duuid = parsed_xml.uuid
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dname = parsed_xml.name
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dmemory = parsed_xml.memory
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dmemory_unit = parsed_xml.memory.attrib['unit']
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dvcpu = parsed_xml.vcpu
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try:
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dvcputopo = '{}/{}/{}'.format(parsed_xml.cpu.topology.attrib['sockets'], parsed_xml.cpu.topology.attrib['cores'], parsed_xml.cpu.topology.attrib['threads'])
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except:
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dvcputopo = 'N/A'
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dtype = parsed_xml.os.type
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darch = parsed_xml.os.type.attrib['arch']
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dmachine = parsed_xml.os.type.attrib['machine']
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dfeatures = []
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for feature in parsed_xml.features.getchildren():
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dfeatures.append(feature.tag)
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dconsole = parsed_xml.devices.console.attrib['type']
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demulator = parsed_xml.devices.emulator
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ddisks = []
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dnets = []
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dcontrollers = []
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for device in parsed_xml.devices.getchildren():
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if device.tag == 'disk':
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disk_attrib = device.source.attrib
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disk_target = device.target.attrib
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disk_type = device.attrib['type']
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if disk_type == 'network':
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disk_obj = { 'type': disk_attrib.get('protocol'), 'name': disk_attrib.get('name'), 'dev': disk_target.get('dev'), 'bus': disk_target.get('bus') }
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elif disk_type == 'file':
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disk_obj = { 'type': 'file', 'name': disk_attrib.get('file'), 'dev': disk_target.get('dev'), 'bus': disk_target.get('bus') }
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else:
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disk_obj = {}
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ddisks.append(disk_obj)
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if device.tag == 'interface':
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net_type = device.attrib['type']
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net_mac = device.mac.attrib['address']
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net_bridge = device.source.attrib[net_type]
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net_model = device.model.attrib['type']
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net_obj = { 'type': net_type, 'mac': net_mac, 'source': net_bridge, 'model': net_model }
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dnets.append(net_obj)
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if device.tag == 'controller':
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controller_type = device.attrib['type']
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try:
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controller_model = device.attrib['model']
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except KeyError:
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controller_model = 'none'
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controller_obj = { 'type': controller_type, 'model': controller_model }
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dcontrollers.append(controller_obj)
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# Format a nice output; do this line-by-line then concat the elements at the end
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ainformation = []
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ainformation.append('Virtual machine information:')
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ainformation.append('')
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# Basic information
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ainformation.append('UUID: {}'.format(duuid))
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ainformation.append('Name: {}'.format(dname))
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ainformation.append('Memory: {} {}'.format(dmemory, dmemory_unit))
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ainformation.append('vCPUs: {}'.format(dvcpu))
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ainformation.append('Topology [S/C/T]: {}'.format(dvcputopo))
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if long_output == True:
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# Virtualization information
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ainformation.append('')
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ainformation.append('Emulator: {}'.format(demulator))
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ainformation.append('Type: {}'.format(dtype))
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ainformation.append('Arch: {}'.format(darch))
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ainformation.append('Machine: {}'.format(dmachine))
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ainformation.append('Features: {}'.format(' '.join(dfeatures)))
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# PVC cluster information
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ainformation.append('')
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ainformation.append('State: {}'.format(dstate))
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ainformation.append('Active Hypervisor: {}'.format(dhypervisor))
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ainformation.append('Last Hypervisor: {}'.format(dlasthypervisor))
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if long_output == True:
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# Disk list
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ainformation.append('')
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ainformation.append('Disks: ID Type Name Dev Bus')
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for disk in ddisks:
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ainformation.append(' {0: <3} {1: <5} {2: <20} {3: <4} {4: <5}'.format(ddisks.index(disk), disk['type'], disk['name'], disk['dev'], disk['bus']))
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# Network list
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ainformation.append('')
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ainformation.append('Interfaces: ID Type Source Model MAC')
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for net in dnets:
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ainformation.append(' {0: <3} {1: <8} {2: <8} {3: <8} {4: <17}'.format(dnets.index(net), net['type'], net['source'], net['model'], net['mac']))
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# Controller list
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ainformation.append('')
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ainformation.append('Controllers: ID Type Model')
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for controller in dcontrollers:
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ainformation.append(' {0: <3} {1: <8} {2: <8}'.format(dcontrollers.index(controller), controller['type'], controller['model']))
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# Join it all together
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information = '\n'.join(ainformation)
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return information
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#
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# Cluster search functions
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#
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def getClusterDomainList(zk):
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# Get a list of UUIDs by listing the children of /domains
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uuid_list = zk.get_children('/domains')
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name_list = []
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# For each UUID, get the corresponding name from the data
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for uuid in uuid_list:
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name_list.append(zk.get('/domains/%s' % uuid)[0].decode('ascii'))
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return uuid_list, name_list
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def searchClusterByUUID(zk, uuid):
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try:
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# Get the lists
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uuid_list, name_list = getClusterDomainList(zk)
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# We're looking for UUID, so find that element ID
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index = uuid_list.index(uuid)
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# Get the name_list element at that index
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name = name_list[index]
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except ValueError:
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# We didn't find anything
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return None
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return name
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def searchClusterByName(zk, name):
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try:
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# Get the lists
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uuid_list, name_list = getClusterDomainList(zk)
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# We're looking for name, so find that element ID
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index = name_list.index(name)
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# Get the uuid_list element at that index
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uuid = uuid_list[index]
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except ValueError:
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# We didn't find anything
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return None
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return uuid
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#
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# Allow mutually exclusive options in Click
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#
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class MutuallyExclusiveOption(click.Option):
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def __init__(self, *args, **kwargs):
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meargs = kwargs.pop('mutually_exclusive', [])
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_me_arg = []
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_me_func = []
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for arg in meargs:
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_me_arg.append(arg['argument'])
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_me_func.append(arg['function'])
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self.me_arg = set(_me_arg)
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self.me_func = set(_me_func)
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help = kwargs.get('help', '')
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if self.me_func:
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ex_str = ', '.join(self.me_arg)
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kwargs['help'] = help + (
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' Mutually exclusive with `' + ex_str + '`.'
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)
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super(MutuallyExclusiveOption, self).__init__(*args, **kwargs)
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def handle_parse_result(self, ctx, opts, args):
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if self.me_func.intersection(opts) and self.name in opts:
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raise click.UsageError(
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"Illegal usage: `{}` is mutually exclusive with "
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"arguments `{}`.".format(
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self.opts[-1],
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', '.join(self.me_arg)
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)
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)
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return super(MutuallyExclusiveOption, self).handle_parse_result(
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ctx,
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opts,
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args
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)
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def fence(node_name, zk):
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time.sleep(3)
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print('>>> Fencing node {} via IPMI reboot signal.'.format(node_name))
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