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pvc/pvc.py

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#!/usr/bin/env python3
# pvcd.py - PVC client command-line interface
# Part of the Parallel Virtual Cluster (PVC) system
#
# Copyright (C) 2018 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, either version 3 of the License, or
# (at your option) any later version.
#
# 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 kazoo.client, os, socket, time, click, lxml.objectify, pvcf, ansiiprint, configparser
myhostname = socket.gethostname()
zk_host = ''
########################
########################
## ##
## CLICK COMPONENTS ##
## ##
########################
########################
CONTEXT_SETTINGS = dict(help_option_names=['-h', '--help'], max_content_width=120)
###############################################################################
# pvc node
###############################################################################
@click.group(name='node', short_help='Manage a PVC hypervisor node', context_settings=CONTEXT_SETTINGS)
def node():
"""
Manage the state of a node in the PVC cluster.
"""
pass
###############################################################################
# pvc node flush
###############################################################################
@click.command(name='flush', short_help='Take a node out of service')
@click.option(
'-n', '--name', 'node_name', default=myhostname, show_default=True,
help='The PVC node to operate on.'
)
def flush_host(node_name):
"""
Take a node out of active service and migrate away all VMs.
Notes:
* The '--name' option defaults to the current host if not set, which is likely not what you want when running this command from a remote host!
"""
# Open a Zookeeper connection
zk = pvcf.startZKConnection(zk_host)
# Verify node is valid
try:
zk.get('/nodes/{}'.format(node_name))
except:
click.echo('ERROR: No node named {} is present in the cluster.'.format(node_name))
exit(1)
click.echo('Flushing hypervisor {} of running VMs.'.format(node_name))
# Add the new domain to Zookeeper
transaction = zk.transaction()
transaction.set_data('/nodes/{}/domainstate'.format(node_name), 'flush'.encode('ascii'))
results = transaction.commit()
# Close the Zookeeper connection
pvcf.stopZKConnection(zk)
###############################################################################
# pvc node ready
###############################################################################
@click.command(name='ready', short_help='Restore node to service')
@click.option(
'-n', '--name', 'node_name', default=myhostname, show_default=True,
help='The PVC node to operate on.'
)
def ready_host(node_name):
"""
Restore a host to active service and migrate back all VMs.
Notes:
* The '--name' option defaults to the current host if not set, which is likely not what you want when running this command from a remote host!
"""
# Open a Zookeeper connection
zk = pvcf.startZKConnection(zk_host)
# Verify node is valid
try:
zk.get('/nodes/{}'.format(node_name))
except:
click.echo('ERROR: No node named {} is present in the cluster.'.format(node_name))
exit(1)
click.echo('Restoring hypervisor {} to active service.'.format(node_name))
# Add the new domain to Zookeeper
transaction = zk.transaction()
transaction.set_data('/nodes/{}/domainstate'.format(node_name), 'unflush'.encode('ascii'))
results = transaction.commit()
# Close the Zookeeper connection
pvcf.stopZKConnection(zk)
###############################################################################
# pvc node info
###############################################################################
@click.command(name='info', short_help='Show details of a node object')
@click.option(
'-n', '--name', 'dom_name',
help='Search for this name.'
)
@click.option(
'-l', '--long', 'long_output', is_flag=True, default=False,
help='Display more detailed information.'
)
def node_info(dom_name, dom_uuid, long_output):
"""
Search the cluster for a node's information.
"""
# Verify node is valid
try:
zk.get('/nodes/{}'.format(node_name))
except:
click.echo('ERROR: No node named {} is present in the cluster.'.format(node_name))
exit(1)
pass
###############################################################################
# pvc node list
###############################################################################
@click.command(name='list', short_help='List all Node objects')
def node_list():
"""
List all hypervisor nodes in the cluster.
"""
node_list_header = ansiiprint.bold() + 'Name State: Daemon Nodes Resources: VMs CPUs RAM [MiB]: Total Used Free Allocated' + ansiiprint.end()
node_list = []
zk = pvcf.startZKConnection(zk_host)
for node_name in zk.get_children('/nodes'):
node_daemon_state = zk.get('/nodes/{}/daemonstate'.format(node_name))[0].decode('ascii')
node_domain_state = zk.get('/nodes/{}/domainstate'.format(node_name))[0].decode('ascii')
node_cpu_count = zk.get('/nodes/{}/cpucount'.format(node_name))[0].decode('ascii')
node_mem_used = zk.get('/nodes/{}/memused'.format(node_name))[0].decode('ascii')
node_mem_free = zk.get('/nodes/{}/memfree'.format(node_name))[0].decode('ascii')
node_mem_total = int(node_mem_used) + int(node_mem_free)
node_domains_count = zk.get('/nodes/{}/domainscount'.format(node_name))[0].decode('ascii')
node_running_domains = zk.get('/nodes/{}/runningdomains'.format(node_name))[0].decode('ascii').split()
node_mem_allocated = 0
for domain in node_running_domains:
parsed_xml = pvcf.getDomainXML(zk, domain)
duuid, dname, dmemory, dvcpu, dvcputopo = pvcf.getDomainMainDetails(parsed_xml)
node_mem_allocated += int(dmemory)
if node_daemon_state == 'start':
daemon_state_colour = ansiiprint.green()
elif node_daemon_state == 'stop' or node_daemon_state == 'shutdown':
daemon_state_colour = ansiiprint.red()
else:
daemon_state_colour = ansiiprint.yellow()
if node_domain_state == 'ready':
domain_state_colour = ansiiprint.green()
else:
domain_state_colour = ansiiprint.blue()
node_output_string = '{3: <28} {0}{4: <6}{2} {1}{5: <8}{2} {6: <4} {7: <4} {8: <6} {9: <6} {10: <6} {11: <6}'.format(
daemon_state_colour,
domain_state_colour,
ansiiprint.end(),
node_name,
node_daemon_state,
node_domain_state,
node_domains_count,
node_cpu_count,
node_mem_total,
node_mem_used,
node_mem_free,
node_mem_allocated
)
node_list.append(node_output_string)
click.echo(node_list_header)
click.echo('\n'.join(sorted(node_list)))
###############################################################################
# pvc vm
###############################################################################
@click.group(name='vm', short_help='Manage a PVC virtual machine', context_settings=CONTEXT_SETTINGS)
def vm():
"""
Manage the state of a virtual machine in the PVC cluster.
"""
pass
###############################################################################
# pvc vm define
###############################################################################
@click.command(name='define', short_help='Define a new virtual machine from a Libvirt XML file.')
@click.option(
'-x', '--xml', 'xml_config_file',
help='The XML config file to define the domain from.'
)
@click.option(
'-t', '--hypervisor', 'target_hypervisor', default=myhostname, show_default=True,
help='The home hypervisor for this domain.'
)
def define_vm(xml_config_file, target_hypervisor):
"""
Define a new virtual machine from a Libvirt XML configuration file.
Notes:
* The '--hypervisor' option defaults to the current host if not set, which is likely not what you want when running this command from a remote host!
"""
# Open the XML file
with open(xml_config_file, 'r') as f_domxmlfile:
data = f_domxmlfile.read()
f_domxmlfile.close()
# Parse the XML data
parsed_xml = lxml.objectify.fromstring(data)
dom_uuid = parsed_xml.uuid.text
dom_name = parsed_xml.name.text
click.echo('Adding new VM with Name "{}" and UUID "{}" to database.'.format(dom_name, dom_uuid))
# Open a Zookeeper connection
zk = pvcf.startZKConnection(zk_host)
# Add the new domain to Zookeeper
transaction = zk.transaction()
transaction.create('/domains/{}'.format(dom_uuid), dom_name.encode('ascii'))
transaction.create('/domains/{}/state'.format(dom_uuid), 'stop'.encode('ascii'))
transaction.create('/domains/{}/hypervisor'.format(dom_uuid), target_hypervisor.encode('ascii'))
transaction.create('/domains/{}/lasthypervisor'.format(dom_uuid), ''.encode('ascii'))
transaction.create('/domains/{}/xml'.format(dom_uuid), data.encode('ascii'))
results = transaction.commit()
# Close the Zookeeper connection
pvcf.stopZKConnection(zk)
###############################################################################
# pvc vm undefine
###############################################################################
@click.command(name='undefine', short_help='Undefine and stop a virtual machine.')
@click.option(
'-n', '--name', 'dom_name',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=[{ 'function': 'dom_uuid', 'argument': '--uuid' }],
help='Search for this human-readable name.'
)
@click.option(
'-u', '--uuid', 'dom_uuid',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=[{ 'function': 'dom_name', 'argument': '--name' }],
help='Search for this UUID.'
)
def undefine_vm(dom_name, dom_uuid):
"""
Stop a virtual machine and remove it from the cluster database.
"""
# Ensure at least one search method is set
if dom_name == None and dom_uuid == None:
click.echo("ERROR: You must specify either a `--name` or `--uuid` value.")
return
# Open a Zookeeper connection
zk = pvcf.startZKConnection(zk_host)
# If the --name value was passed, get the UUID
if dom_name != None:
dom_uuid = pvcf.searchClusterByName(zk, dom_name)
# Verify we got a result or abort
if not pvcf.validateUUID(dom_uuid):
if dom_name != None:
message_name = dom_name
else:
message_name = dom_uuid
click.echo('ERROR: Could not find VM "{}" in the cluster!'.format(message_name))
return
current_vm_state = zk.get('/domains/{}/state'.format(dom_uuid))[0].decode('ascii')
if current_vm_state != 'stop':
click.echo('Forcibly stopping VM "{}".'.format(dom_uuid))
# Set the domain into stop mode
transaction = zk.transaction()
transaction.set_data('/domains/{}/state'.format(dom_uuid), 'stop'.encode('ascii'))
transaction.commit()
# Wait for 3 seconds to allow state to flow to all hypervisors
click.echo('Waiting for cluster to update.')
time.sleep(3)
# Delete the configurations
click.echo('Undefining VM "{}".'.format(dom_uuid))
transaction = zk.transaction()
transaction.delete('/domains/{}/state'.format(dom_uuid))
transaction.delete('/domains/{}/hypervisor'.format(dom_uuid))
transaction.delete('/domains/{}/lasthypervisor'.format(dom_uuid))
transaction.delete('/domains/{}/xml'.format(dom_uuid))
transaction.delete('/domains/{}'.format(dom_uuid))
transaction.commit()
# Close the Zookeeper connection
pvcf.stopZKConnection(zk)
###############################################################################
# pvc vm start
###############################################################################
@click.command(name='start', short_help='Start up a defined virtual machine.')
@click.option(
'-n', '--name', 'dom_name',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=[{ 'function': 'dom_uuid', 'argument': '--uuid' }],
help='Search for this human-readable name.'
)
@click.option(
'-u', '--uuid', 'dom_uuid',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=[{ 'function': 'dom_name', 'argument': '--name' }],
help='Search for this UUID.'
)
def start_vm(dom_name, dom_uuid):
"""
Start up a virtual machine on its configured hypervisor.
"""
# Ensure at least one search method is set
if dom_name == None and dom_uuid == None:
click.echo("ERROR: You must specify either a `--name` or `--uuid` value.")
return
# Open a Zookeeper connection
zk = pvcf.startZKConnection(zk_host)
# If the --name value was passed, get the UUID
if dom_name != None:
dom_uuid = pvcf.searchClusterByName(zk, dom_name)
# Verify we got a result or abort
if not pvcf.validateUUID(dom_uuid):
if dom_name != None:
message_name = dom_name
else:
message_name = dom_uuid
click.echo('ERROR: Could not find VM "{}" in the cluster!'.format(message_name))
return
# Set the VM to start
click.echo('Starting VM "{}".'.format(dom_uuid))
zk.set('/domains/%s/state' % dom_uuid, 'start'.encode('ascii'))
# Close the Zookeeper connection
pvcf.stopZKConnection(zk)
###############################################################################
# pvc vm shutdown
###############################################################################
@click.command(name='shutdown', short_help='Gracefully shut down a running virtual machine.')
@click.option(
'-n', '--name', 'dom_name',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=[{ 'function': 'dom_uuid', 'argument': '--uuid' }],
help='Search for this human-readable name.'
)
@click.option(
'-u', '--uuid', 'dom_uuid',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=[{ 'function': 'dom_name', 'argument': '--name' }],
help='Search for this UUID.'
)
def shutdown_vm(dom_name, dom_uuid):
"""
Gracefully shut down a running virtual machine.
"""
# Ensure at least one search method is set
if dom_name == None and dom_uuid == None:
click.echo("ERROR: You must specify either a `--name` or `--uuid` value.")
return
# Open a Zookeeper connection
zk = pvcf.startZKConnection(zk_host)
# If the --name value was passed, get the UUID
if dom_name != None:
dom_uuid = pvcf.searchClusterByName(zk, dom_name)
# Verify we got a result or abort
if not pvcf.validateUUID(dom_uuid):
if dom_name != None:
message_name = dom_name
else:
message_name = dom_uuid
click.echo('ERROR: Could not find VM "{}" in the cluster!'.format(message_name))
return
# Set the VM to shutdown
click.echo('Shutting down VM "{}".'.format(dom_uuid))
zk.set('/domains/%s/state' % dom_uuid, 'shutdown'.encode('ascii'))
# Close the Zookeeper connection
pvcf.stopZKConnection(zk)
###############################################################################
# pvc vm stop
###############################################################################
@click.command(name='stop', short_help='Forcibly halt a running virtual machine.')
@click.option(
'-n', '--name', 'dom_name',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=[{ 'function': 'dom_uuid', 'argument': '--uuid' }],
help='Search for this human-readable name.'
)
@click.option(
'-u', '--uuid', 'dom_uuid',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=[{ 'function': 'dom_name', 'argument': '--name' }],
help='Search for this UUID.'
)
def stop_vm(dom_name, dom_uuid):
"""
Forcibly halt (destroy) a running virtual machine.
"""
# Ensure at least one search method is set
if dom_name == None and dom_uuid == None:
click.echo("ERROR: You must specify either a `--name` or `--uuid` value.")
return
# Open a Zookeeper connection
zk = pvcf.startZKConnection(zk_host)
# If the --name value was passed, get the UUID
if dom_name != None:
dom_uuid = pvcf.searchClusterByName(zk, dom_name)
# Verify we got a result or abort
if not pvcf.validateUUID(dom_uuid):
if dom_name != None:
message_name = dom_name
else:
message_name = dom_uuid
click.echo('ERROR: Could not find VM "{}" in the cluster!'.format(message_name))
return
# Set the VM to start
click.echo('Forcibly stopping VM "{}".'.format(dom_uuid))
zk.set('/domains/%s/state' % dom_uuid, 'stop'.encode('ascii'))
# Close the Zookeeper connection
pvcf.stopZKConnection(zk)
###############################################################################
# pvc vm move
###############################################################################
@click.command(name='move', short_help='Permanently move a virtual machine to another node.')
@click.option(
'-n', '--name', 'dom_name',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=[{ 'function': 'dom_uuid', 'argument': '--uuid' }],
help='Search for this human-readable name.'
)
@click.option(
'-u', '--uuid', 'dom_uuid',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=[{ 'function': 'dom_name', 'argument': '--name' }],
help='Search for this UUID.'
)
@click.option(
'-t', '--target', 'target_hypervisor', default=None,
help='The target hypervisor to migrate to.'
)
def move_vm(dom_name, dom_uuid, target_hypervisor):
"""
Permanently move a virtual machine, via live migration if running and possible, to another hypervisor node.
"""
# Ensure at least one search method is set
if dom_name == None and dom_uuid == None:
click.echo("ERROR: You must specify either a `--name` or `--uuid` value.")
return
# Open a Zookeeper connection
zk = pvcf.startZKConnection(zk_host)
# If the --name value was passed, get the UUID
if dom_name != None:
dom_uuid = pvcf.searchClusterByName(zk, dom_name)
# Verify we got a result or abort
if not pvcf.validateUUID(dom_uuid):
if dom_name != None:
message_name = dom_name
else:
message_name = dom_uuid
click.echo('ERROR: Could not find VM "{}" in the cluster!'.format(message_name))
return
current_hypervisor = zk.get('/domains/{}/hypervisor'.format(dom_uuid))[0].decode('ascii')
if target_hypervisor == None:
# Determine the best hypervisor to migrate the VM to based on active memory usage
hypervisor_list = zk.get_children('/nodes')
most_memfree = 0
for hypervisor in hypervisor_list:
state = zk.get('/nodes/{}/state'.format(hypervisor))[0].decode('ascii')
if state != 'start' or hypervisor == current_hypervisor:
continue
memfree = int(zk.get('/nodes/{}/memfree'.format(hypervisor))[0].decode('ascii'))
if memfree > most_memfree:
most_memfree = memfree
target_hypervisor = hypervisor
else:
if target_hypervisor == current_hypervisor:
click.echo('ERROR: The VM "{}" is already running on hypervisor "{}".'.format(dom_uuid, current_hypervisor))
return
current_vm_state = zk.get('/domains/{}/state'.format(dom_uuid))[0].decode('ascii')
if current_vm_state == 'start':
click.echo('Permanently migrating VM "{}" to hypervisor "{}".'.format(dom_uuid, target_hypervisor))
transaction = zk.transaction()
transaction.set_data('/domains/{}/state'.format(dom_uuid), 'migrate'.encode('ascii'))
transaction.set_data('/domains/{}/hypervisor'.format(dom_uuid), target_hypervisor.encode('ascii'))
transaction.set_data('/domains/{}/lasthypervisor'.format(dom_uuid), ''.encode('ascii'))
transaction.commit()
else:
click.echo('Permanently moving VM "{}" to hypervisor "{}".'.format(dom_uuid, target_hypervisor))
transaction = zk.transaction()
transaction.set_data('/domains/{}/hypervisor'.format(dom_uuid), target_hypervisor.encode('ascii'))
transaction.set_data('/domains/{}/lasthypervisor'.format(dom_uuid), ''.encode('ascii'))
transaction.commit()
# Close the Zookeeper connection
pvcf.stopZKConnection(zk)
###############################################################################
# pvc vm migrate
###############################################################################
@click.command(name='migrate', short_help='Migrate a virtual machine to another node.')
@click.option(
'-n', '--name', 'dom_name',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=[{ 'function': 'dom_uuid', 'argument': '--uuid' }],
help='Search for this human-readable name.'
)
@click.option(
'-u', '--uuid', 'dom_uuid',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=[{ 'function': 'dom_name', 'argument': '--name' }],
help='Search for this UUID.'
)
@click.option(
'-t', '--target', 'target_hypervisor', default=None,
help='The target hypervisor to migrate to.'
)
@click.option(
'-f', '--force', 'force_migrate', is_flag=True, default=False,
help='Force migrate an already migrated VM.'
)
def migrate_vm(dom_name, dom_uuid, target_hypervisor, force_migrate):
"""
Migrate a running virtual machine, via live migration if possible, to another hypervisor node.
"""
# Ensure at least one search method is set
if dom_name == None and dom_uuid == None:
click.echo("ERROR: You must specify either a `--name` or `--uuid` value.")
return
# Open a Zookeeper connection
zk = pvcf.startZKConnection(zk_host)
# If the --name value was passed, get the UUID
if dom_name != None:
dom_uuid = pvcf.searchClusterByName(zk, dom_name)
# Verify we got a result or abort
if not pvcf.validateUUID(dom_uuid):
if dom_name != None:
message_name = dom_name
else:
message_name = dom_uuid
click.echo('ERROR: Could not find VM "{}" in the cluster!'.format(message_name))
return
current_hypervisor = zk.get('/domains/{}/hypervisor'.format(dom_uuid))[0].decode('ascii')
last_hypervisor = zk.get('/domains/{}/lasthypervisor'.format(dom_uuid))[0].decode('ascii')
if last_hypervisor != '' and force_migrate != True:
click.echo('ERROR: The VM "{}" has been previously migrated.'.format(dom_uuid))
click.echo('> Last hypervisor: {}'.format(last_hypervisor))
click.echo('> Current hypervisor: {}'.format(current_hypervisor))
click.echo('Run `vm unmigrate` to restore the VM to its previous hypervisor, or use `--force` to override this check.')
return
if target_hypervisor == None:
# Determine the best hypervisor to migrate the VM to based on active memory usage
hypervisor_list = zk.get_children('/nodes')
most_memfree = 0
for hypervisor in hypervisor_list:
daemon_state = zk.get('/nodes/{}/daemonstate'.format(hypervisor))[0].decode('ascii')
domain_state = zk.get('/nodes/{}/domainstate'.format(hypervisor))[0].decode('ascii')
if daemon_state != 'start' or domain_state != 'ready' or hypervisor == current_hypervisor:
continue
memfree = int(zk.get('/nodes/{}/memfree'.format(hypervisor))[0].decode('ascii'))
if memfree > most_memfree:
most_memfree = memfree
target_hypervisor = hypervisor
else:
if target_hypervisor == current_hypervisor:
click.echo('ERROR: The VM "{}" is already running on hypervisor "{}".'.format(dom_uuid, current_hypervisor))
return
click.echo('Migrating VM "{}" to hypervisor "{}".'.format(dom_uuid, target_hypervisor))
transaction = zk.transaction()
transaction.set_data('/domains/{}/state'.format(dom_uuid), 'migrate'.encode('ascii'))
transaction.set_data('/domains/{}/hypervisor'.format(dom_uuid), target_hypervisor.encode('ascii'))
transaction.set_data('/domains/{}/lasthypervisor'.format(dom_uuid), current_hypervisor.encode('ascii'))
transaction.commit()
# Close the Zookeeper connection
pvcf.stopZKConnection(zk)
###############################################################################
# pvc vm unmigrate
###############################################################################
@click.command(name='unmigrate', short_help='Restore a migrated virtual machine to its original node.')
@click.option(
'-n', '--name', 'dom_name',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=[{ 'function': 'dom_uuid', 'argument': '--uuid' }],
help='Search for this human-readable name.'
)
@click.option(
'-u', '--uuid', 'dom_uuid',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=[{ 'function': 'dom_name', 'argument': '--name' }],
help='Search for this UUID.'
)
def unmigrate_vm(dom_name, dom_uuid):
"""
Restore a previously migrated virtual machine, via live migration if possible, to its original hypervisor node.
"""
# Ensure at least one search method is set
if dom_name == None and dom_uuid == None:
click.echo("ERROR: You must specify either a `--name` or `--uuid` value.")
return
# Open a Zookeeper connection
zk = pvcf.startZKConnection(zk_host)
# If the --name value was passed, get the UUID
if dom_name != None:
dom_uuid = pvcf.searchClusterByName(zk, dom_name)
# Verify we got a result or abort
if not pvcf.validateUUID(dom_uuid):
if dom_name != None:
message_name = dom_name
else:
message_name = dom_uuid
click.echo('ERROR: Could not find VM "{}" in the cluster!'.format(message_name))
return
target_hypervisor = zk.get('/domains/{}/lasthypervisor'.format(dom_uuid))[0].decode('ascii')
if target_hypervisor == '':
click.echo('ERROR: The VM "{}" has not been previously migrated.'.format(dom_uuid))
return
click.echo('Unmigrating VM "{}" back to hypervisor "{}".'.format(dom_uuid, target_hypervisor))
transaction = zk.transaction()
transaction.set_data('/domains/{}/state'.format(dom_uuid), 'migrate'.encode('ascii'))
transaction.set_data('/domains/{}/hypervisor'.format(dom_uuid), target_hypervisor.encode('ascii'))
transaction.set_data('/domains/{}/lasthypervisor'.format(dom_uuid), ''.encode('ascii'))
transaction.commit()
# Close the Zookeeper connection
pvcf.stopZKConnection(zk)
###############################################################################
# pvc vm info
###############################################################################
@click.command(name='info', short_help='Show details of a VM object')
@click.option(
'-n', '--name', 'dom_name',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=[{ 'function': 'dom_uuid', 'argument': '--uuid' }],
help='Search for this human-readable name.'
)
@click.option(
'-u', '--uuid', 'dom_uuid',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=[{ 'function': 'dom_name', 'argument': '--name' }],
help='Search for this UUID.'
)
@click.option(
'-l', '--long', 'long_output', is_flag=True, default=False,
help='Display more detailed information.'
)
def vm_info(dom_name, dom_uuid, long_output):
"""
Search the cluster for a virtual machine's information.
"""
# Ensure at least one search method is set
if dom_name == None and dom_uuid == None:
click.echo("ERROR: You must specify either a `--name` or `--uuid` value.")
return
zk = pvcf.startZKConnection(zk_host)
if dom_name != None:
dom_uuid = pvcf.searchClusterByName(zk, dom_name)
if dom_uuid != None:
dom_name = pvcf.searchClusterByUUID(zk, dom_uuid)
information = pvcf.getInformationFromXML(zk, dom_uuid, long_output)
if information == None:
click.echo('ERROR: Could not find a domain matching that name or UUID.')
return
click.echo(information)
pvcf.stopZKConnection(zk)
###############################################################################
# pvc vm list
###############################################################################
@click.command(name='list', short_help='List all VM objects')
@click.option(
'-t', '--hypervisor', 'hypervisor', default=None,
help='Limit list to this hypervisor.'
)
def vm_list(hypervisor):
"""
List all virtual machines in the cluster.
"""
vm_list_header = ansiiprint.bold() + 'Name UUID State RAM [MiB] vCPUs Hypervisor Migrated?' + ansiiprint.end()
vm_list = []
zk = pvcf.startZKConnection(zk_host)
for vm in zk.get_children('/domains'):
# Check hypervisor to avoid unneeded ZK calls
vm_hypervisor = zk.get('/domains/{}/hypervisor'.format(vm))[0].decode('ascii')
if hypervisor != None and vm_hypervisor != hypervisor:
continue
vm_state = zk.get('/domains/{}/state'.format(vm))[0].decode('ascii')
vm_lasthypervisor = zk.get('/domains/{}/lasthypervisor'.format(vm))[0].decode('ascii')
if vm_lasthypervisor != '':
vm_migrated = 'from {}'.format(vm_lasthypervisor)
else:
vm_migrated = 'no'
vm_xml = pvcf.getDomainXML(zk, vm)
vm_uuid, vm_name, vm_memory, vm_vcpu, vm_vcputopo = pvcf.getDomainMainDetails(vm_xml)
if vm_state == 'start':
state_colour = ansiiprint.green()
elif vm_state == 'stop' or vm_state == 'shutdown':
state_colour = ansiiprint.red()
else:
state_colour = ansiiprint.yellow()
vm_output_string = '{2: <16} {3: <32} {0}{4: <8}{1} {5: <6} {6: <5} {7: <20} {8: <25}'.format(
state_colour,
ansiiprint.end(),
vm_name,
vm_uuid,
vm_state,
vm_memory,
vm_vcpu,
vm_hypervisor,
vm_migrated
)
vm_list.append(vm_output_string)
click.echo(vm_list_header)
click.echo('\n'.join(sorted(vm_list)))
###############################################################################
# pvc init
###############################################################################
@click.command(name='init', short_help='Initialize a new cluster')
@click.option('--yes', is_flag=True,
expose_value=False,
prompt='DANGER: This command will destroy any existing cluster data. Do you want to continue?')
def init_cluster():
"""
Perform initialization of Zookeeper to act as a PVC cluster
"""
click.echo('Initializing a new cluster with Zookeeper address "{}".'.format(zk_host))
# Open a Zookeeper connection
zk = pvcf.startZKConnection(zk_host)
# Destroy the existing data
try:
zk.delete('/domains', recursive=True)
zk.delete('nodes', recursive=True)
except:
pass
# Create the root keys
transaction = zk.transaction()
transaction.create('/domains', ''.encode('ascii'))
transaction.create('/nodes', ''.encode('ascii'))
transaction.commit()
# Close the Zookeeper connection
pvcf.stopZKConnection(zk)
click.echo('Successfully initialized new cluster. Any running PVC daemons will need to be restarted.')
###############################################################################
# pvc
###############################################################################
@click.group(context_settings=CONTEXT_SETTINGS)
@click.option(
'-z', '--zookeeper', '_zk_host', envvar='PVC_ZOOKEEPER', default='{}:2181'.format(myhostname), show_default=True,
help='Zookeeper connection string.'
)
def cli(_zk_host):
"""
Parallel Virtual Cluster CLI management tool
"""
global zk_host
zk_host = _zk_host
#
# Click command tree
#
node.add_command(flush_host)
node.add_command(ready_host)
node.add_command(node_info)
node.add_command(node_list)
vm.add_command(define_vm)
vm.add_command(undefine_vm)
vm.add_command(start_vm)
vm.add_command(shutdown_vm)
vm.add_command(stop_vm)
vm.add_command(move_vm)
vm.add_command(migrate_vm)
vm.add_command(unmigrate_vm)
vm.add_command(vm_info)
vm.add_command(vm_list)
cli.add_command(node)
cli.add_command(vm)
cli.add_command(init_cluster)
#
# Main entry point
#
def main():
return cli(obj={})
if __name__ == '__main__':
main()
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