Source code for freezer_dr.fencers.drivers.libvirt.driver

# (c) Copyright 2014,2015 Hewlett-Packard Development Company, L.P.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from freezer_dr.common.yaml_parser import YamlParser
from freezer_dr.fencers.common.driver import FencerBaseDriver
import libvirt
from oslo_log import log
from oslo_config import cfg
import time

CONF = cfg.CONF
LOG = log.getLogger(__name__)


[docs]class LibvirtDriver(FencerBaseDriver): def __init__(self, nodes, fencer_conf): super(LibvirtDriver, self).__init__(nodes, fencer_conf) self.parser = YamlParser(self.fencer_conf['credentials_file']) # initiate libvirt connection conn_name = self.fencer_conf.get('name', None) self.connection = libvirt.open(name=conn_name)
[docs] def force_shutdown(self, node): target = self.connection.lookupByName(name=node.get('domain-name')) return target.destroy()
[docs] def graceful_shutdown(self, node): target = self.connection.lookupByName(name=node.get('domain-name')) return target.shutdown()
[docs] def status(self, node): target = self.connection.lookupByName(name=node.get('domain-name')) return target.isActive()
[docs] def get_node_details(self, node): """Loads the node's fencing information from ``credentials_file`` :param node: a dict contains node ip or hostname :return: a dict contains node fencing information """ node_details = self.parser.find_server_by_ip(node.get('ip')) or \ self.parser.find_server_by_hostname(node.get('host')) return node_details
[docs] def fence(self): """Implements the fencing procedure for server fencing using ipmi :return: a list of nodes and weather they're fenced or not! """ fenced_nodes = [] for node in self.nodes: LOG.debug("fencing node {0}".format(node)) # load node details node_details = self.get_node_details(node) # loop on the node number of n times trying to fence it gently, # if not force it! for retry in range(0, self.fencer_conf['retries']): if self.status(node=node_details): try: self.graceful_shutdown(node=node_details) except Exception as e: LOG.debug(e) else: node['status'] = True break time.sleep(self.fencer_conf['hold_period']) LOG.info('wait for %d seconds before retrying to gracefully ' 'shutdown' % self.fencer_conf['hold_period']) try: self.force_shutdown(node=node_details) except Exception as e: LOG.error(e) if not self.status(node=node_details): node['status'] = True else: node['status'] = False fenced_nodes.append(node) return fenced_nodes
[docs] def get_info(self): return { 'name': 'Libvirt Interface driver', 'version': 1.1, 'author': 'Hewlett-Packard Enterprise Company, L.P' }