853 lines
31 KiB
Python
853 lines
31 KiB
Python
#!/usr/bin/env python3
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# vm.py - PVC client function library, VM fuctions
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# Part of the Parallel Virtual Cluster (PVC) system
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#
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# Copyright (C) 2018-2021 Joshua M. Boniface <joshua@boniface.me>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, version 3.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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###############################################################################
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import time
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import re
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import lxml.objectify
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import lxml.etree
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import daemon_lib.common as common
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import daemon_lib.ceph as ceph
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from daemon_lib.network import set_sriov_vf_vm, unset_sriov_vf_vm
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#
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# Cluster search functions
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#
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def getClusterDomainList(zkhandler):
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# Get a list of UUIDs by listing the children of /domains
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uuid_list = zkhandler.children('base.domain')
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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(zkhandler.read(('domain', uuid)))
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return uuid_list, name_list
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def searchClusterByUUID(zkhandler, uuid):
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try:
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# Get the lists
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uuid_list, name_list = getClusterDomainList(zkhandler)
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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(zkhandler, name):
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try:
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# Get the lists
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uuid_list, name_list = getClusterDomainList(zkhandler)
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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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def getDomainUUID(zkhandler, domain):
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# Validate that VM exists in cluster
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if common.validateUUID(domain):
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dom_name = searchClusterByUUID(zkhandler, domain)
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dom_uuid = searchClusterByName(zkhandler, dom_name)
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else:
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dom_uuid = searchClusterByName(zkhandler, domain)
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dom_name = searchClusterByUUID(zkhandler, dom_uuid)
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return dom_uuid
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def getDomainName(zkhandler, domain):
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# Validate that VM exists in cluster
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if common.validateUUID(domain):
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dom_name = searchClusterByUUID(zkhandler, domain)
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dom_uuid = searchClusterByName(zkhandler, dom_name)
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else:
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dom_uuid = searchClusterByName(zkhandler, domain)
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dom_name = searchClusterByUUID(zkhandler, dom_uuid)
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return dom_name
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#
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# Helper functions
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#
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def change_state(zkhandler, dom_uuid, new_state):
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lock = zkhandler.exclusivelock(('domain.state', dom_uuid))
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with lock:
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zkhandler.write([
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(('domain.state', dom_uuid), new_state)
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])
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# Wait for 1/2 second to allow state to flow to all nodes
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time.sleep(0.5)
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#
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# Direct functions
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#
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def is_migrated(zkhandler, domain):
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# Validate that VM exists in cluster
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dom_uuid = getDomainUUID(zkhandler, domain)
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if not dom_uuid:
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return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
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last_node = zkhandler.read(('domain.last_node', dom_uuid))
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if last_node:
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return True
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else:
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return False
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def flush_locks(zkhandler, domain):
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# Validate that VM exists in cluster
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dom_uuid = getDomainUUID(zkhandler, domain)
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if not dom_uuid:
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return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
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# Verify that the VM is in a stopped state; freeing locks is not safe otherwise
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state = zkhandler.read(('domain.state', dom_uuid))
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if state != 'stop':
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return False, 'ERROR: VM "{}" is not in stopped state; flushing RBD locks on a running VM is dangerous.'.format(domain)
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# Tell the cluster to create a new OSD for the host
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flush_locks_string = 'flush_locks {}'.format(dom_uuid)
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zkhandler.write([
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('base.cmd.domain', flush_locks_string)
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])
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# Wait 1/2 second for the cluster to get the message and start working
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time.sleep(0.5)
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# Acquire a read lock, so we get the return exclusively
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lock = zkhandler.readlock('base.cmd.domain')
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with lock:
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try:
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result = zkhandler.read('base.cmd.domain').split()[0]
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if result == 'success-flush_locks':
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message = 'Flushed locks on VM "{}"'.format(domain)
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success = True
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else:
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message = 'ERROR: Failed to flush locks on VM "{}"; check node logs for details.'.format(domain)
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success = False
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except Exception:
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message = 'ERROR: Command ignored by node.'
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success = False
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# Acquire a write lock to ensure things go smoothly
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lock = zkhandler.writelock('base.cmd.domain')
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with lock:
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time.sleep(0.5)
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zkhandler.write([
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('base.cmd.domain', '')
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])
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return success, message
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def define_vm(zkhandler, config_data, target_node, node_limit, node_selector, node_autostart, migration_method=None, profile=None, initial_state='stop'):
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# Parse the XML data
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try:
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parsed_xml = lxml.objectify.fromstring(config_data)
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except Exception:
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return False, 'ERROR: Failed to parse XML data.'
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dom_uuid = parsed_xml.uuid.text
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dom_name = parsed_xml.name.text
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# Ensure that the UUID and name are unique
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if searchClusterByUUID(zkhandler, dom_uuid) or searchClusterByName(zkhandler, dom_name):
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return False, 'ERROR: Specified VM "{}" or UUID "{}" matches an existing VM on the cluster'.format(dom_name, dom_uuid)
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if not target_node:
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target_node = common.findTargetNode(zkhandler, dom_uuid)
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else:
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# Verify node is valid
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valid_node = common.verifyNode(zkhandler, target_node)
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if not valid_node:
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return False, 'ERROR: Specified node "{}" is invalid.'.format(target_node)
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# If a SR-IOV network device is being added, set its used state
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dnetworks = common.getDomainNetworks(parsed_xml, {})
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for network in dnetworks:
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if network['type'] in ['direct', 'hostdev']:
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dom_node = zkhandler.read(('domain.node', dom_uuid))
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# Check if the network is already in use
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is_used = zkhandler.read(('node.sriov.vf', dom_node, 'sriov_vf.used', network['source']))
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if is_used == 'True':
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used_by_name = searchClusterByUUID(zkhandler, zkhandler.read(('node.sriov.vf', dom_node, 'sriov_vf.used_by', network['source'])))
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return False, 'ERROR: Attempted to use SR-IOV network "{}" which is already used by VM "{}" on node "{}".'.format(network['source'], used_by_name, dom_node)
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# We must update the "used" section
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set_sriov_vf_vm(zkhandler, dom_uuid, dom_node, network['source'], network['mac'], network['type'])
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# Obtain the RBD disk list using the common functions
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ddisks = common.getDomainDisks(parsed_xml, {})
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rbd_list = []
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for disk in ddisks:
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if disk['type'] == 'rbd':
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rbd_list.append(disk['name'])
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# Join the limit
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if isinstance(node_limit, list) and node_limit:
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formatted_node_limit = ','.join(node_limit)
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else:
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formatted_node_limit = ''
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# Join the RBD list
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if isinstance(rbd_list, list) and rbd_list:
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formatted_rbd_list = ','.join(rbd_list)
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else:
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formatted_rbd_list = ''
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# Add the new domain to Zookeeper
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zkhandler.write([
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(('domain', dom_uuid), dom_name),
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(('domain.xml', dom_uuid), config_data),
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(('domain.state', dom_uuid), initial_state),
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(('domain.profile', dom_uuid), profile),
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(('domain.stats', dom_uuid), ''),
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(('domain.node', dom_uuid), target_node),
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(('domain.last_node', dom_uuid), ''),
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(('domain.failed_reason', dom_uuid), ''),
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(('domain.storage.volumes', dom_uuid), formatted_rbd_list),
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(('domain.console.log', dom_uuid), ''),
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(('domain.console.vnc', dom_uuid), ''),
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(('domain.meta.autostart', dom_uuid), node_autostart),
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(('domain.meta.migrate_method', dom_uuid), migration_method),
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(('domain.meta.node_limit', dom_uuid), formatted_node_limit),
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(('domain.meta.node_selector', dom_uuid), node_selector),
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(('domain.migrate.sync_lock', dom_uuid), ''),
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])
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return True, 'Added new VM with Name "{}" and UUID "{}" to database.'.format(dom_name, dom_uuid)
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def modify_vm_metadata(zkhandler, domain, node_limit, node_selector, node_autostart, provisioner_profile, migration_method):
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dom_uuid = getDomainUUID(zkhandler, domain)
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if not dom_uuid:
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return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
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update_list = list()
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if node_limit is not None:
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update_list.append((('domain.meta.node_limit', dom_uuid), node_limit))
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if node_selector is not None:
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update_list.append((('domain.meta.node_selector', dom_uuid), node_selector))
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if node_autostart is not None:
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update_list.append((('domain.meta.autostart', dom_uuid), node_autostart))
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if provisioner_profile is not None:
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update_list.append((('domain.profile', dom_uuid), provisioner_profile))
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if migration_method is not None:
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update_list.append((('domain.meta.migrate_method', dom_uuid), migration_method))
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if len(update_list) < 1:
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return False, 'ERROR: No updates to apply.'
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zkhandler.write(update_list)
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return True, 'Successfully modified PVC metadata of VM "{}".'.format(domain)
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def modify_vm(zkhandler, domain, restart, new_vm_config):
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dom_uuid = getDomainUUID(zkhandler, domain)
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if not dom_uuid:
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return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
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dom_name = getDomainName(zkhandler, domain)
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# Parse and valiate the XML
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try:
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parsed_xml = lxml.objectify.fromstring(new_vm_config)
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except Exception:
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return False, 'ERROR: Failed to parse new XML data.'
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# If a SR-IOV network device is being added, set its used state
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dnetworks = common.getDomainNetworks(parsed_xml, {})
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for network in dnetworks:
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if network['type'] in ['direct', 'hostdev']:
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dom_node = zkhandler.read(('domain.node', dom_uuid))
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# Check if the network is already in use
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is_used = zkhandler.read(('node.sriov.vf', dom_node, 'sriov_vf.used', network['source']))
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if is_used == 'True':
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used_by_name = searchClusterByUUID(zkhandler, zkhandler.read(('node.sriov.vf', dom_node, 'sriov_vf.used_by', network['source'])))
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return False, 'ERROR: Attempted to use SR-IOV network "{}" which is already used by VM "{}" on node "{}".'.format(network['source'], used_by_name, dom_node)
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# We must update the "used" section
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set_sriov_vf_vm(zkhandler, dom_uuid, dom_node, network['source'], network['mac'], network['type'])
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# If a SR-IOV network device is being removed, unset its used state
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old_vm_config = zkhandler.read(('domain.xml', dom_uuid))
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try:
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old_parsed_xml = lxml.objectify.fromstring(old_vm_config)
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except Exception:
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return False, 'ERROR: Failed to parse old XML data.'
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old_dnetworks = common.getDomainNetworks(old_parsed_xml, {})
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for network in old_dnetworks:
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if network['type'] in ['direct', 'hostdev']:
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if network['mac'] not in [n['mac'] for n in dnetworks]:
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dom_node = zkhandler.read(('domain.node', dom_uuid))
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# We must update the "used" section
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unset_sriov_vf_vm(zkhandler, dom_node, network['source'])
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# Obtain the RBD disk list using the common functions
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ddisks = common.getDomainDisks(parsed_xml, {})
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rbd_list = []
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for disk in ddisks:
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if disk['type'] == 'rbd':
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rbd_list.append(disk['name'])
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# Join the RBD list
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if isinstance(rbd_list, list) and rbd_list:
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formatted_rbd_list = ','.join(rbd_list)
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else:
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formatted_rbd_list = ''
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# Add the modified config to Zookeeper
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zkhandler.write([
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(('domain', dom_uuid), dom_name),
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(('domain.storage.volumes', dom_uuid), formatted_rbd_list),
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(('domain.xml', dom_uuid), new_vm_config),
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])
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if restart:
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change_state(zkhandler, dom_uuid, 'restart')
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return True, 'Successfully modified configuration of VM "{}".'.format(domain)
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def dump_vm(zkhandler, domain):
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dom_uuid = getDomainUUID(zkhandler, domain)
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if not dom_uuid:
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return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
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# Gram the domain XML and dump it to stdout
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vm_xml = zkhandler.read(('domain.xml', dom_uuid))
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return True, vm_xml
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def rename_vm(zkhandler, domain, new_domain):
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dom_uuid = getDomainUUID(zkhandler, domain)
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if not dom_uuid:
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return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
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# Verify that the VM is in a stopped state; renaming is not supported otherwise
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state = zkhandler.read(('domain.state', dom_uuid))
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if state != 'stop':
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return False, 'ERROR: VM "{}" is not in stopped state; VMs cannot be renamed while running.'.format(domain)
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# Parse and valiate the XML
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vm_config = common.getDomainXML(zkhandler, dom_uuid)
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# Obtain the RBD disk list using the common functions
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ddisks = common.getDomainDisks(vm_config, {})
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pool_list = []
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rbd_list = []
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for disk in ddisks:
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if disk['type'] == 'rbd':
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pool_list.append(disk['name'].split('/')[0])
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rbd_list.append(disk['name'].split('/')[1])
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# Rename each volume in turn
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for idx, rbd in enumerate(rbd_list):
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rbd_new = re.sub(r"{}".format(domain), new_domain, rbd)
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# Skip renaming if nothing changed
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if rbd_new == rbd:
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continue
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ceph.rename_volume(zkhandler, pool_list[idx], rbd, rbd_new)
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# Replace the name in the config
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vm_config_new = lxml.etree.tostring(vm_config, encoding='ascii', method='xml').decode().replace(domain, new_domain)
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# Get VM information
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_b, dom_info = get_info(zkhandler, dom_uuid)
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# Undefine the old VM
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undefine_vm(zkhandler, dom_uuid)
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# Define the new VM
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define_vm(zkhandler, vm_config_new, dom_info['node'], dom_info['node_limit'], dom_info['node_selector'], dom_info['node_autostart'], migration_method=dom_info['migration_method'], profile=dom_info['profile'], initial_state='stop')
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# If the VM is migrated, store that
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if dom_info['migrated'] != 'no':
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zkhandler.write([
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(('domain.last_node', dom_uuid), dom_info['last_node'])
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])
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return True, 'Successfully renamed VM "{}" to "{}".'.format(domain, new_domain)
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def undefine_vm(zkhandler, domain):
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# Validate that VM exists in cluster
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dom_uuid = getDomainUUID(zkhandler, domain)
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if not dom_uuid:
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return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
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# Shut down the VM
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current_vm_state = zkhandler.read(('domain.state', dom_uuid))
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if current_vm_state != 'stop':
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change_state(zkhandler, dom_uuid, 'stop')
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# Gracefully terminate the class instances
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change_state(zkhandler, dom_uuid, 'delete')
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# Delete the configurations
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zkhandler.delete([
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('domain', dom_uuid)
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])
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return True, 'Undefined VM "{}" from the cluster.'.format(domain)
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def remove_vm(zkhandler, domain):
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# Validate that VM exists in cluster
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dom_uuid = getDomainUUID(zkhandler, domain)
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if not dom_uuid:
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return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
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disk_list = common.getDomainDiskList(zkhandler, dom_uuid)
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# Shut down the VM
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current_vm_state = zkhandler.read(('domain.state', dom_uuid))
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if current_vm_state != 'stop':
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change_state(zkhandler, dom_uuid, 'stop')
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# Gracefully terminate the class instances
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change_state(zkhandler, dom_uuid, 'delete')
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# Delete the configurations
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zkhandler.delete([
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('domain', dom_uuid)
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])
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# Wait for 1 second to allow state to flow to all nodes
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time.sleep(1)
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# Remove disks
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for disk in disk_list:
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# vmpool/vmname_volume
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try:
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disk_pool, disk_name = disk.split('/')
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retcode, message = ceph.remove_volume(zkhandler, disk_pool, disk_name)
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except ValueError:
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continue
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return True, 'Removed VM "{}" and disks from the cluster.'.format(domain)
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def start_vm(zkhandler, domain):
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# Validate that VM exists in cluster
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dom_uuid = getDomainUUID(zkhandler, domain)
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if not dom_uuid:
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return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
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# Set the VM to start
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change_state(zkhandler, dom_uuid, 'start')
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return True, 'Starting VM "{}".'.format(domain)
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def restart_vm(zkhandler, domain, wait=False):
|
|
# Validate that VM exists in cluster
|
|
dom_uuid = getDomainUUID(zkhandler, domain)
|
|
if not dom_uuid:
|
|
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
|
|
|
|
# Get state and verify we're OK to proceed
|
|
current_state = zkhandler.read(('domain.state', dom_uuid))
|
|
if current_state != 'start':
|
|
return False, 'ERROR: VM "{}" is not in "start" state!'.format(domain)
|
|
|
|
retmsg = 'Restarting VM "{}".'.format(domain)
|
|
|
|
# Set the VM to restart
|
|
change_state(zkhandler, dom_uuid, 'restart')
|
|
|
|
if wait:
|
|
while zkhandler.read(('domain.state', dom_uuid)) == 'restart':
|
|
time.sleep(0.5)
|
|
retmsg = 'Restarted VM "{}"'.format(domain)
|
|
|
|
return True, retmsg
|
|
|
|
|
|
def shutdown_vm(zkhandler, domain, wait=False):
|
|
# Validate that VM exists in cluster
|
|
dom_uuid = getDomainUUID(zkhandler, domain)
|
|
if not dom_uuid:
|
|
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
|
|
|
|
# Get state and verify we're OK to proceed
|
|
current_state = zkhandler.read(('domain.state', dom_uuid))
|
|
if current_state != 'start':
|
|
return False, 'ERROR: VM "{}" is not in "start" state!'.format(domain)
|
|
|
|
retmsg = 'Shutting down VM "{}"'.format(domain)
|
|
|
|
# Set the VM to shutdown
|
|
change_state(zkhandler, dom_uuid, 'shutdown')
|
|
|
|
if wait:
|
|
while zkhandler.read(('domain.state', dom_uuid)) == 'shutdown':
|
|
time.sleep(0.5)
|
|
retmsg = 'Shut down VM "{}"'.format(domain)
|
|
|
|
return True, retmsg
|
|
|
|
|
|
def stop_vm(zkhandler, domain):
|
|
# Validate that VM exists in cluster
|
|
dom_uuid = getDomainUUID(zkhandler, domain)
|
|
if not dom_uuid:
|
|
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
|
|
|
|
# Set the VM to stop
|
|
change_state(zkhandler, dom_uuid, 'stop')
|
|
|
|
return True, 'Forcibly stopping VM "{}".'.format(domain)
|
|
|
|
|
|
def disable_vm(zkhandler, domain):
|
|
# Validate that VM exists in cluster
|
|
dom_uuid = getDomainUUID(zkhandler, domain)
|
|
if not dom_uuid:
|
|
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
|
|
|
|
# Get state and verify we're OK to proceed
|
|
current_state = zkhandler.read(('domain.state', dom_uuid))
|
|
if current_state != 'stop':
|
|
return False, 'ERROR: VM "{}" must be stopped before disabling!'.format(domain)
|
|
|
|
# Set the VM to disable
|
|
change_state(zkhandler, dom_uuid, 'disable')
|
|
|
|
return True, 'Marked VM "{}" as disable.'.format(domain)
|
|
|
|
|
|
def update_vm_sriov_nics(zkhandler, dom_uuid, source_node, target_node):
|
|
# Update all the SR-IOV device states on both nodes, used during migrations but called by the node-side
|
|
vm_config = zkhandler.read(('domain.xml', dom_uuid))
|
|
parsed_xml = lxml.objectify.fromstring(vm_config)
|
|
dnetworks = common.getDomainNetworks(parsed_xml, {})
|
|
retcode = True
|
|
retmsg = ''
|
|
for network in dnetworks:
|
|
if network['type'] in ['direct', 'hostdev']:
|
|
# Check if the network is already in use
|
|
is_used = zkhandler.read(('node.sriov.vf', target_node, 'sriov_vf.used', network['source']))
|
|
if is_used == 'True':
|
|
used_by_name = searchClusterByUUID(zkhandler, zkhandler.read(('node.sriov.vf', target_node, 'sriov_vf.used_by', network['source'])))
|
|
if retcode:
|
|
retcode = False
|
|
retmsg = 'Attempting to use SR-IOV network "{}" which is already used by VM "{}"'.format(network['source'], used_by_name)
|
|
|
|
# We must update the "used" section
|
|
if retcode:
|
|
# This conditional ensure that if we failed the is_used check, we don't try to overwrite the information of a VF that belongs to another VM
|
|
set_sriov_vf_vm(zkhandler, dom_uuid, target_node, network['source'], network['mac'], network['type'])
|
|
# ... but we still want to free the old node in an case
|
|
unset_sriov_vf_vm(zkhandler, source_node, network['source'])
|
|
|
|
return retcode, retmsg
|
|
|
|
|
|
def move_vm(zkhandler, domain, target_node, wait=False, force_live=False):
|
|
# Validate that VM exists in cluster
|
|
dom_uuid = getDomainUUID(zkhandler, domain)
|
|
if not dom_uuid:
|
|
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
|
|
|
|
# Get state and verify we're OK to proceed
|
|
current_state = zkhandler.read(('domain.state', dom_uuid))
|
|
if current_state != 'start':
|
|
# If the current state isn't start, preserve it; we're not doing live migration
|
|
target_state = current_state
|
|
else:
|
|
if force_live:
|
|
target_state = 'migrate-live'
|
|
else:
|
|
target_state = 'migrate'
|
|
|
|
current_node = zkhandler.read(('domain.node', dom_uuid))
|
|
|
|
if not target_node:
|
|
target_node = common.findTargetNode(zkhandler, dom_uuid)
|
|
else:
|
|
# Verify node is valid
|
|
valid_node = common.verifyNode(zkhandler, target_node)
|
|
if not valid_node:
|
|
return False, 'ERROR: Specified node "{}" is invalid.'.format(target_node)
|
|
|
|
# Check if node is within the limit
|
|
node_limit = zkhandler.read(('domain.meta.node_limit', dom_uuid))
|
|
if node_limit and target_node not in node_limit.split(','):
|
|
return False, 'ERROR: Specified node "{}" is not in the allowed list of nodes for VM "{}".'.format(target_node, domain)
|
|
|
|
# Verify if node is current node
|
|
if target_node == current_node:
|
|
last_node = zkhandler.read(('domain.last_node', dom_uuid))
|
|
if last_node:
|
|
zkhandler.write([
|
|
(('domain.last_node', dom_uuid), '')
|
|
])
|
|
return True, 'Making temporary migration permanent for VM "{}".'.format(domain)
|
|
|
|
return False, 'ERROR: VM "{}" is already running on node "{}".'.format(domain, current_node)
|
|
|
|
if not target_node:
|
|
return False, 'ERROR: Could not find a valid migration target for VM "{}".'.format(domain)
|
|
|
|
retmsg = 'Permanently migrating VM "{}" to node "{}".'.format(domain, target_node)
|
|
|
|
lock = zkhandler.exclusivelock(('domain.state', dom_uuid))
|
|
with lock:
|
|
zkhandler.write([
|
|
(('domain.state', dom_uuid), target_state),
|
|
(('domain.node', dom_uuid), target_node),
|
|
(('domain.last_node', dom_uuid), '')
|
|
])
|
|
|
|
# Wait for 1/2 second for migration to start
|
|
time.sleep(0.5)
|
|
|
|
if wait:
|
|
while zkhandler.read(('domain.state', dom_uuid)) == target_state:
|
|
time.sleep(0.5)
|
|
retmsg = 'Permanently migrated VM "{}" to node "{}"'.format(domain, target_node)
|
|
|
|
return True, retmsg
|
|
|
|
|
|
def migrate_vm(zkhandler, domain, target_node, force_migrate, wait=False, force_live=False):
|
|
# Validate that VM exists in cluster
|
|
dom_uuid = getDomainUUID(zkhandler, domain)
|
|
if not dom_uuid:
|
|
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
|
|
|
|
# Get state and verify we're OK to proceed
|
|
current_state = zkhandler.read(('domain.state', dom_uuid))
|
|
if current_state != 'start':
|
|
# If the current state isn't start, preserve it; we're not doing live migration
|
|
target_state = current_state
|
|
else:
|
|
if force_live:
|
|
target_state = 'migrate-live'
|
|
else:
|
|
target_state = 'migrate'
|
|
|
|
current_node = zkhandler.read(('domain.node', dom_uuid))
|
|
last_node = zkhandler.read(('domain.last_node', dom_uuid))
|
|
|
|
if last_node and not force_migrate:
|
|
return False, 'ERROR: VM "{}" has been previously migrated.'.format(domain)
|
|
|
|
if not target_node:
|
|
target_node = common.findTargetNode(zkhandler, dom_uuid)
|
|
else:
|
|
# Verify node is valid
|
|
valid_node = common.verifyNode(zkhandler, target_node)
|
|
if not valid_node:
|
|
return False, 'ERROR: Specified node "{}" is invalid.'.format(target_node)
|
|
|
|
# Check if node is within the limit
|
|
node_limit = zkhandler.read(('domain.meta.node_limit', dom_uuid))
|
|
if node_limit and target_node not in node_limit.split(','):
|
|
return False, 'ERROR: Specified node "{}" is not in the allowed list of nodes for VM "{}".'.format(target_node, domain)
|
|
|
|
# Verify if node is current node
|
|
if target_node == current_node:
|
|
return False, 'ERROR: VM "{}" is already running on node "{}".'.format(domain, current_node)
|
|
|
|
if not target_node:
|
|
return False, 'ERROR: Could not find a valid migration target for VM "{}".'.format(domain)
|
|
|
|
# Don't overwrite an existing last_node when using force_migrate
|
|
if last_node and force_migrate:
|
|
current_node = last_node
|
|
|
|
retmsg = 'Migrating VM "{}" to node "{}".'.format(domain, target_node)
|
|
|
|
lock = zkhandler.exclusivelock(('domain.state', dom_uuid))
|
|
with lock:
|
|
zkhandler.write([
|
|
(('domain.state', dom_uuid), target_state),
|
|
(('domain.node', dom_uuid), target_node),
|
|
(('domain.last_node', dom_uuid), current_node)
|
|
])
|
|
|
|
# Wait for 1/2 second for migration to start
|
|
time.sleep(0.5)
|
|
|
|
if wait:
|
|
while zkhandler.read(('domain.state', dom_uuid)) == target_state:
|
|
time.sleep(0.5)
|
|
retmsg = 'Migrated VM "{}" to node "{}"'.format(domain, target_node)
|
|
|
|
return True, retmsg
|
|
|
|
|
|
def unmigrate_vm(zkhandler, domain, wait=False, force_live=False):
|
|
# Validate that VM exists in cluster
|
|
dom_uuid = getDomainUUID(zkhandler, domain)
|
|
if not dom_uuid:
|
|
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
|
|
|
|
# Get state and verify we're OK to proceed
|
|
current_state = zkhandler.read(('domain.state', dom_uuid))
|
|
if current_state != 'start':
|
|
# If the current state isn't start, preserve it; we're not doing live migration
|
|
target_state = current_state
|
|
else:
|
|
if force_live:
|
|
target_state = 'migrate-live'
|
|
else:
|
|
target_state = 'migrate'
|
|
|
|
target_node = zkhandler.read(('domain.last_node', dom_uuid))
|
|
|
|
if target_node == '':
|
|
return False, 'ERROR: VM "{}" has not been previously migrated.'.format(domain)
|
|
|
|
retmsg = 'Unmigrating VM "{}" back to node "{}".'.format(domain, target_node)
|
|
|
|
lock = zkhandler.exclusivelock(('domain.state', dom_uuid))
|
|
with lock:
|
|
zkhandler.write([
|
|
(('domain.state', dom_uuid), target_state),
|
|
(('domain.node', dom_uuid), target_node),
|
|
(('domain.last_node', dom_uuid), '')
|
|
])
|
|
|
|
# Wait for 1/2 second for migration to start
|
|
time.sleep(0.5)
|
|
|
|
if wait:
|
|
while zkhandler.read(('domain.state', dom_uuid)) == target_state:
|
|
time.sleep(0.5)
|
|
retmsg = 'Unmigrated VM "{}" back to node "{}"'.format(domain, target_node)
|
|
|
|
return True, retmsg
|
|
|
|
|
|
def get_console_log(zkhandler, domain, lines=1000):
|
|
# Validate that VM exists in cluster
|
|
dom_uuid = getDomainUUID(zkhandler, domain)
|
|
if not dom_uuid:
|
|
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
|
|
|
|
# Get the data from ZK
|
|
console_log = zkhandler.read(('domain.log.console', dom_uuid))
|
|
|
|
# Shrink the log buffer to length lines
|
|
shrunk_log = console_log.split('\n')[-lines:]
|
|
loglines = '\n'.join(shrunk_log)
|
|
|
|
return True, loglines
|
|
|
|
|
|
def get_info(zkhandler, domain):
|
|
# Validate that VM exists in cluster
|
|
dom_uuid = getDomainUUID(zkhandler, domain)
|
|
if not dom_uuid:
|
|
return False, 'ERROR: No VM named "{}" is present in the cluster.'.format(domain)
|
|
|
|
# Gather information from XML config and print it
|
|
domain_information = common.getInformationFromXML(zkhandler, dom_uuid)
|
|
if not domain_information:
|
|
return False, 'ERROR: Could not get information about VM "{}".'.format(domain)
|
|
|
|
return True, domain_information
|
|
|
|
|
|
def get_list(zkhandler, node, state, limit, is_fuzzy=True):
|
|
if node:
|
|
# Verify node is valid
|
|
if not common.verifyNode(zkhandler, node):
|
|
return False, 'Specified node "{}" is invalid.'.format(node)
|
|
|
|
if state:
|
|
valid_states = ['start', 'restart', 'shutdown', 'stop', 'disable', 'fail', 'migrate', 'unmigrate', 'provision']
|
|
if state not in valid_states:
|
|
return False, 'VM state "{}" is not valid.'.format(state)
|
|
|
|
full_vm_list = zkhandler.children('base.domain')
|
|
vm_list = []
|
|
|
|
# Set our limit to a sensible regex
|
|
if limit and is_fuzzy:
|
|
try:
|
|
# Implcitly assume fuzzy limits
|
|
if not re.match(r'\^.*', limit):
|
|
limit = '.*' + limit
|
|
if not re.match(r'.*\$', limit):
|
|
limit = limit + '.*'
|
|
except Exception as e:
|
|
return False, 'Regex Error: {}'.format(e)
|
|
|
|
# If we're limited, remove other nodes' VMs
|
|
vm_node = {}
|
|
vm_state = {}
|
|
for vm in full_vm_list:
|
|
# Check we don't match the limit
|
|
name = zkhandler.read(('domain', vm))
|
|
vm_node[vm] = zkhandler.read(('domain.node', vm))
|
|
vm_state[vm] = zkhandler.read(('domain.state', vm))
|
|
# Handle limiting
|
|
if limit:
|
|
try:
|
|
if re.match(limit, vm):
|
|
if not node and not state:
|
|
vm_list.append(common.getInformationFromXML(zkhandler, vm))
|
|
else:
|
|
if vm_node[vm] == node or vm_state[vm] == state:
|
|
vm_list.append(common.getInformationFromXML(zkhandler, vm))
|
|
|
|
if re.match(limit, name):
|
|
if not node and not state:
|
|
vm_list.append(common.getInformationFromXML(zkhandler, vm))
|
|
else:
|
|
if vm_node[vm] == node or vm_state[vm] == state:
|
|
vm_list.append(common.getInformationFromXML(zkhandler, vm))
|
|
except Exception as e:
|
|
return False, 'Regex Error: {}'.format(e)
|
|
else:
|
|
# Check node to avoid unneeded ZK calls
|
|
if not node and not state:
|
|
vm_list.append(common.getInformationFromXML(zkhandler, vm))
|
|
else:
|
|
if vm_node[vm] == node or vm_state[vm] == state:
|
|
vm_list.append(common.getInformationFromXML(zkhandler, vm))
|
|
|
|
return True, vm_list
|