pvc/daemon-common/vm.py

853 lines
31 KiB
Python

#!/usr/bin/env python3
# vm.py - PVC client function library, VM fuctions
# Part of the Parallel Virtual Cluster (PVC) system
#
# Copyright (C) 2018-2021 Joshua M. Boniface <joshua@boniface.me>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
#
###############################################################################
import time
import re
import lxml.objectify
import lxml.etree
import daemon_lib.common as common
import daemon_lib.ceph as ceph
from daemon_lib.network import set_sriov_vf_vm, unset_sriov_vf_vm
#
# Cluster search functions
#
def getClusterDomainList(zkhandler):
# Get a list of UUIDs by listing the children of /domains
uuid_list = zkhandler.children('base.domain')
name_list = []
# For each UUID, get the corresponding name from the data
for uuid in uuid_list:
name_list.append(zkhandler.read(('domain', uuid)))
return uuid_list, name_list
def searchClusterByUUID(zkhandler, uuid):
try:
# Get the lists
uuid_list, name_list = getClusterDomainList(zkhandler)
# We're looking for UUID, so find that element ID
index = uuid_list.index(uuid)
# Get the name_list element at that index
name = name_list[index]
except ValueError:
# We didn't find anything
return None
return name
def searchClusterByName(zkhandler, name):
try:
# Get the lists
uuid_list, name_list = getClusterDomainList(zkhandler)
# We're looking for name, so find that element ID
index = name_list.index(name)
# Get the uuid_list element at that index
uuid = uuid_list[index]
except ValueError:
# We didn't find anything
return None
return uuid
def getDomainUUID(zkhandler, domain):
# Validate that VM exists in cluster
if common.validateUUID(domain):
dom_name = searchClusterByUUID(zkhandler, domain)
dom_uuid = searchClusterByName(zkhandler, dom_name)
else:
dom_uuid = searchClusterByName(zkhandler, domain)
dom_name = searchClusterByUUID(zkhandler, dom_uuid)
return dom_uuid
def getDomainName(zkhandler, domain):
# Validate that VM exists in cluster
if common.validateUUID(domain):
dom_name = searchClusterByUUID(zkhandler, domain)
dom_uuid = searchClusterByName(zkhandler, dom_name)
else:
dom_uuid = searchClusterByName(zkhandler, domain)
dom_name = searchClusterByUUID(zkhandler, dom_uuid)
return dom_name
#
# Helper functions
#
def change_state(zkhandler, dom_uuid, new_state):
lock = zkhandler.exclusivelock(('domain.state', dom_uuid))
with lock:
zkhandler.write([
(('domain.state', dom_uuid), new_state)
])
# Wait for 1/2 second to allow state to flow to all nodes
time.sleep(0.5)
#
# Direct functions
#
def is_migrated(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)
last_node = zkhandler.read(('domain.last_node', dom_uuid))
if last_node:
return True
else:
return False
def flush_locks(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)
# Verify that the VM is in a stopped state; freeing locks is not safe otherwise
state = zkhandler.read(('domain.state', dom_uuid))
if state != 'stop':
return False, 'ERROR: VM "{}" is not in stopped state; flushing RBD locks on a running VM is dangerous.'.format(domain)
# Tell the cluster to create a new OSD for the host
flush_locks_string = 'flush_locks {}'.format(dom_uuid)
zkhandler.write([
('base.cmd.domain', flush_locks_string)
])
# Wait 1/2 second for the cluster to get the message and start working
time.sleep(0.5)
# Acquire a read lock, so we get the return exclusively
lock = zkhandler.readlock('base.cmd.domain')
with lock:
try:
result = zkhandler.read('base.cmd.domain').split()[0]
if result == 'success-flush_locks':
message = 'Flushed locks on VM "{}"'.format(domain)
success = True
else:
message = 'ERROR: Failed to flush locks on VM "{}"; check node logs for details.'.format(domain)
success = False
except Exception:
message = 'ERROR: Command ignored by node.'
success = False
# Acquire a write lock to ensure things go smoothly
lock = zkhandler.writelock('base.cmd.domain')
with lock:
time.sleep(0.5)
zkhandler.write([
('base.cmd.domain', '')
])
return success, message
def define_vm(zkhandler, config_data, target_node, node_limit, node_selector, node_autostart, migration_method=None, profile=None, initial_state='stop'):
# Parse the XML data
try:
parsed_xml = lxml.objectify.fromstring(config_data)
except Exception:
return False, 'ERROR: Failed to parse XML data.'
dom_uuid = parsed_xml.uuid.text
dom_name = parsed_xml.name.text
# Ensure that the UUID and name are unique
if searchClusterByUUID(zkhandler, dom_uuid) or searchClusterByName(zkhandler, dom_name):
return False, 'ERROR: Specified VM "{}" or UUID "{}" matches an existing VM on the cluster'.format(dom_name, 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)
# If a SR-IOV network device is being added, set its used state
dnetworks = common.getDomainNetworks(parsed_xml, {})
for network in dnetworks:
if network['type'] in ['direct', 'hostdev']:
dom_node = zkhandler.read(('domain.node', dom_uuid))
# Check if the network is already in use
is_used = zkhandler.read(('node.sriov.vf', dom_node, 'sriov_vf.used', network['source']))
if is_used == 'True':
used_by_name = searchClusterByUUID(zkhandler, zkhandler.read(('node.sriov.vf', dom_node, 'sriov_vf.used_by', network['source'])))
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)
# We must update the "used" section
set_sriov_vf_vm(zkhandler, dom_uuid, dom_node, network['source'], network['mac'], network['type'])
# Obtain the RBD disk list using the common functions
ddisks = common.getDomainDisks(parsed_xml, {})
rbd_list = []
for disk in ddisks:
if disk['type'] == 'rbd':
rbd_list.append(disk['name'])
# Join the limit
if isinstance(node_limit, list) and node_limit:
formatted_node_limit = ','.join(node_limit)
else:
formatted_node_limit = ''
# Join the RBD list
if isinstance(rbd_list, list) and rbd_list:
formatted_rbd_list = ','.join(rbd_list)
else:
formatted_rbd_list = ''
# Add the new domain to Zookeeper
zkhandler.write([
(('domain', dom_uuid), dom_name),
(('domain.xml', dom_uuid), config_data),
(('domain.state', dom_uuid), initial_state),
(('domain.profile', dom_uuid), profile),
(('domain.stats', dom_uuid), ''),
(('domain.node', dom_uuid), target_node),
(('domain.last_node', dom_uuid), ''),
(('domain.failed_reason', dom_uuid), ''),
(('domain.storage.volumes', dom_uuid), formatted_rbd_list),
(('domain.console.log', dom_uuid), ''),
(('domain.console.vnc', dom_uuid), ''),
(('domain.meta.autostart', dom_uuid), node_autostart),
(('domain.meta.migrate_method', dom_uuid), migration_method),
(('domain.meta.node_limit', dom_uuid), formatted_node_limit),
(('domain.meta.node_selector', dom_uuid), node_selector),
(('domain.migrate.sync_lock', dom_uuid), ''),
])
return True, 'Added new VM with Name "{}" and UUID "{}" to database.'.format(dom_name, dom_uuid)
def modify_vm_metadata(zkhandler, domain, node_limit, node_selector, node_autostart, provisioner_profile, migration_method):
dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
update_list = list()
if node_limit is not None:
update_list.append((('domain.meta.node_limit', dom_uuid), node_limit))
if node_selector is not None:
update_list.append((('domain.meta.node_selector', dom_uuid), node_selector))
if node_autostart is not None:
update_list.append((('domain.meta.autostart', dom_uuid), node_autostart))
if provisioner_profile is not None:
update_list.append((('domain.profile', dom_uuid), provisioner_profile))
if migration_method is not None:
update_list.append((('domain.meta.migrate_method', dom_uuid), migration_method))
if len(update_list) < 1:
return False, 'ERROR: No updates to apply.'
zkhandler.write(update_list)
return True, 'Successfully modified PVC metadata of VM "{}".'.format(domain)
def modify_vm(zkhandler, domain, restart, new_vm_config):
dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
dom_name = getDomainName(zkhandler, domain)
# Parse and valiate the XML
try:
parsed_xml = lxml.objectify.fromstring(new_vm_config)
except Exception:
return False, 'ERROR: Failed to parse new XML data.'
# If a SR-IOV network device is being added, set its used state
dnetworks = common.getDomainNetworks(parsed_xml, {})
for network in dnetworks:
if network['type'] in ['direct', 'hostdev']:
dom_node = zkhandler.read(('domain.node', dom_uuid))
# Check if the network is already in use
is_used = zkhandler.read(('node.sriov.vf', dom_node, 'sriov_vf.used', network['source']))
if is_used == 'True':
used_by_name = searchClusterByUUID(zkhandler, zkhandler.read(('node.sriov.vf', dom_node, 'sriov_vf.used_by', network['source'])))
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)
# We must update the "used" section
set_sriov_vf_vm(zkhandler, dom_uuid, dom_node, network['source'], network['mac'], network['type'])
# If a SR-IOV network device is being removed, unset its used state
old_vm_config = zkhandler.read(('domain.xml', dom_uuid))
try:
old_parsed_xml = lxml.objectify.fromstring(old_vm_config)
except Exception:
return False, 'ERROR: Failed to parse old XML data.'
old_dnetworks = common.getDomainNetworks(old_parsed_xml, {})
for network in old_dnetworks:
if network['type'] in ['direct', 'hostdev']:
if network['mac'] not in [n['mac'] for n in dnetworks]:
dom_node = zkhandler.read(('domain.node', dom_uuid))
# We must update the "used" section
unset_sriov_vf_vm(zkhandler, dom_node, network['source'])
# Obtain the RBD disk list using the common functions
ddisks = common.getDomainDisks(parsed_xml, {})
rbd_list = []
for disk in ddisks:
if disk['type'] == 'rbd':
rbd_list.append(disk['name'])
# Join the RBD list
if isinstance(rbd_list, list) and rbd_list:
formatted_rbd_list = ','.join(rbd_list)
else:
formatted_rbd_list = ''
# Add the modified config to Zookeeper
zkhandler.write([
(('domain', dom_uuid), dom_name),
(('domain.storage.volumes', dom_uuid), formatted_rbd_list),
(('domain.xml', dom_uuid), new_vm_config),
])
if restart:
change_state(zkhandler, dom_uuid, 'restart')
return True, 'Successfully modified configuration of VM "{}".'.format(domain)
def dump_vm(zkhandler, domain):
dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
# Gram the domain XML and dump it to stdout
vm_xml = zkhandler.read(('domain.xml', dom_uuid))
return True, vm_xml
def rename_vm(zkhandler, domain, new_domain):
dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
# Verify that the VM is in a stopped state; renaming is not supported otherwise
state = zkhandler.read(('domain.state', dom_uuid))
if state != 'stop':
return False, 'ERROR: VM "{}" is not in stopped state; VMs cannot be renamed while running.'.format(domain)
# Parse and valiate the XML
vm_config = common.getDomainXML(zkhandler, dom_uuid)
# Obtain the RBD disk list using the common functions
ddisks = common.getDomainDisks(vm_config, {})
pool_list = []
rbd_list = []
for disk in ddisks:
if disk['type'] == 'rbd':
pool_list.append(disk['name'].split('/')[0])
rbd_list.append(disk['name'].split('/')[1])
# Rename each volume in turn
for idx, rbd in enumerate(rbd_list):
rbd_new = re.sub(r"{}".format(domain), new_domain, rbd)
# Skip renaming if nothing changed
if rbd_new == rbd:
continue
ceph.rename_volume(zkhandler, pool_list[idx], rbd, rbd_new)
# Replace the name in the config
vm_config_new = lxml.etree.tostring(vm_config, encoding='ascii', method='xml').decode().replace(domain, new_domain)
# Get VM information
_b, dom_info = get_info(zkhandler, dom_uuid)
# Undefine the old VM
undefine_vm(zkhandler, dom_uuid)
# Define the new VM
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')
# If the VM is migrated, store that
if dom_info['migrated'] != 'no':
zkhandler.write([
(('domain.last_node', dom_uuid), dom_info['last_node'])
])
return True, 'Successfully renamed VM "{}" to "{}".'.format(domain, new_domain)
def undefine_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)
# Shut down the VM
current_vm_state = zkhandler.read(('domain.state', dom_uuid))
if current_vm_state != 'stop':
change_state(zkhandler, dom_uuid, 'stop')
# Gracefully terminate the class instances
change_state(zkhandler, dom_uuid, 'delete')
# Delete the configurations
zkhandler.delete([
('domain', dom_uuid)
])
return True, 'Undefined VM "{}" from the cluster.'.format(domain)
def remove_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)
disk_list = common.getDomainDiskList(zkhandler, dom_uuid)
# Shut down the VM
current_vm_state = zkhandler.read(('domain.state', dom_uuid))
if current_vm_state != 'stop':
change_state(zkhandler, dom_uuid, 'stop')
# Gracefully terminate the class instances
change_state(zkhandler, dom_uuid, 'delete')
# Delete the configurations
zkhandler.delete([
('domain', dom_uuid)
])
# Wait for 1 second to allow state to flow to all nodes
time.sleep(1)
# Remove disks
for disk in disk_list:
# vmpool/vmname_volume
try:
disk_pool, disk_name = disk.split('/')
retcode, message = ceph.remove_volume(zkhandler, disk_pool, disk_name)
except ValueError:
continue
return True, 'Removed VM "{}" and disks from the cluster.'.format(domain)
def start_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 start
change_state(zkhandler, dom_uuid, 'start')
return True, 'Starting VM "{}".'.format(domain)
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