pvc/pvc.py

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2018-05-31 20:26:44 -04:00
#!/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/>.
#
###############################################################################
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import kazoo.client, socket, time, click
import pvcf
from lxml import objectify
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this_host = socket.gethostname()
zk_host = ''
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CONTEXT_SETTINGS = dict(help_option_names=['-h', '--help'], max_content_width=120)
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# Creates a new domain based on an XML file
def define_domain(domxmlfile, target_hypervisor):
with open(domxmlfile, 'r') as f_domxmlfile:
data = f_domxmlfile.read()
f_domxmlfile.close()
parsed_xml = objectify.fromstring(data)
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domuuid = parsed_xml.uuid.text
domname = parsed_xml.name.text
print('Adding new VM with Name %s and UUID %s to database' % (domname, domuuid))
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zk = pvcf.startZKConnection(zk_host)
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transaction = zk.transaction()
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transaction.create('/domains/%s' % domuuid, domname.encode('ascii'))
transaction.create('/domains/%s/state' % domuuid, 'stop'.encode('ascii'))
transaction.create('/domains/%s/hypervisor' % domuuid, target_hypervisor.encode('ascii'))
transaction.create('/domains/%s/lasthypervisor' % domuuid, ''.encode('ascii'))
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transaction.create('/domains/%s/name' % domuuid, data.encode('ascii'))
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transaction.create('/domains/%s/xml' % domuuid, data.encode('ascii'))
results = transaction.commit()
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pvcf.stopZKConnection(zk)
def delete_domain(domuuid):
zk = pvcf.startZKConnection(zk_host)
# Set the domain into delete mode
transaction = zk.transaction()
transaction.set_data('/domains/%s/state' % domuuid, 'delete'.encode('ascii'))
results = transaction.commit()
print(results)
# Wait for 3 seconds to allow state to flow to all hypervisors
time.sleep(3)
# Delete the configurations
transaction = zk.transaction()
transaction.delete('/domains/%s/state' % domuuid)
transaction.delete('/domains/%s/hypervisor' % domuuid)
transaction.delete('/domains/%s/lasthypervisor' % domuuid)
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transaction.delete('/domains/%s/xml' % domuuid)
transaction.delete('/domains/%s' % domuuid)
results = transaction.commit()
print(results)
pvcf.stopZKConnection(zk)
# Migrate VM to target_hypervisor
def migrate_domain(domuuid, target_hypervisor):
zk = pvcf.startZKConnection(zk_host)
current_hypervisor = zk.get('/domains/%s/hypervisor' % domuuid)[0].decode('ascii')
last_hypervisor = zk.get('/domains/%s/lasthypervisor' % domuuid)[0].decode('ascii')
if last_hypervisor != '':
print('The VM %s has been previously migrated from %s to %s. You must unmigrate it before migrating it again!' % (domuuid, last_hypervisor, current_hypervisor))
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pvcf.stopZKConnection(zk)
return
print('Migrating VM with UUID %s from hypervisor %s to hypervisor %s' % (domuuid, current_hypervisor, target_hypervisor))
transaction = zk.transaction()
transaction.set_data('/domains/%s/state' % domuuid, 'migrate'.encode('ascii'))
transaction.set_data('/domains/%s/hypervisor' % domuuid, target_hypervisor.encode('ascii'))
transaction.set_data('/domains/%s/lasthypervisor' % domuuid, current_hypervisor.encode('ascii'))
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results = transaction.commit()
print(results)
pvcf.stopZKConnection(zk)
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# Unmigrate VM back from previous hypervisor
def unmigrate_domain(domuuid):
zk = pvcf.startZKConnection(zk_host)
target_hypervisor = zk.get('/domains/%s/lasthypervisor' % domuuid)[0].decode('ascii')
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if target_hypervisor == '':
print('The VM %s has not been previously migrated and cannot be unmigrated.' % domuuid)
pvcf.stopZKConnection(zk)
return
print('Unmigrating VM with UUID %s back to hypervisor %s' % (domuuid, target_hypervisor))
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transaction = zk.transaction()
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transaction.set_data('/domains/%s/state' % domuuid, 'migrate'.encode('ascii'))
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transaction.set_data('/domains/%s/hypervisor' % domuuid, target_hypervisor.encode('ascii'))
transaction.set_data('/domains/%s/lasthypervisor' % domuuid, ''.encode('ascii'))
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results = transaction.commit()
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print(results)
pvcf.stopZKConnection(zk)
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########################
########################
## ##
## CLICK COMPONENTS ##
## ##
########################
########################
###############################################################################
# pvc node
###############################################################################
@click.group(name='node', short_help='Manage a PVC hypervisor node', context_settings=CONTEXT_SETTINGS)
@click.option(
'-n', '--name', 'node_name', default=this_host, show_default=True,
help='The PVC node to operate on.'
)
def node():
"""
Manage the state of a node in the PVC cluster.
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!
"""
pass
###############################################################################
# pvc node flush
###############################################################################
@click.command(name='flush', short_help='Take a node out of service')
def flush_host():
"""
Take a node out of active service and migrate away all VMs.
"""
pass
###############################################################################
# pvc node ready
###############################################################################
@click.command(name='ready', short_help='Restore node to service')
def ready_host():
"""
Restore a host to active service and migrate back all VMs.
"""
pass
###############################################################################
# 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.
Notes:
* PVC virtual machines are always managed by UUID. To find a name-to-UUID mapping, use the 'search' command.
"""
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(
'-v', '--hypervisor', 'target_hypervisor', default=this_host, 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!
"""
define_domain(xml_config_file, target_hypervisor)
###############################################################################
# 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' }],
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help='Search for this human-readable name.'
)
@click.option(
'-u', '--uuid', 'dom_uuid',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=[{ 'function': 'dom_name', 'argument': '--name' }],
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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("You must specify either a `--name` or `--uuid` value.")
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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)
# Set the VM to start
zk.set('/domains/%s/state' % dom_uuid, 'start'.encode('ascii'))
# Close the Zookeeper connection
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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' }],
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help='Search for this human-readable name.'
)
@click.option(
'-u', '--uuid', 'dom_uuid',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=[{ 'function': 'dom_name', 'argument': '--name' }],
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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("You must specify either a `--name` or `--uuid` value.")
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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)
# Set the VM to start
zk.set('/domains/%s/state' % dom_uuid, 'shutdown'.encode('ascii'))
# Close the Zookeeper connection
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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' }],
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help='Search for this human-readable name.'
)
@click.option(
'-u', '--uuid', 'dom_uuid',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=[{ 'function': 'dom_name', 'argument': '--name' }],
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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("You must specify either a `--name` or `--uuid` value.")
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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)
# Set the VM to start
zk.set('/domains/%s/state' % dom_uuid, 'stop'.encode('ascii'))
# Close the Zookeeper connection
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pvcf.stopZKConnection(zk)
###############################################################################
# pvc vm migrate
###############################################################################
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@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):
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"""
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("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)
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('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:
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('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
###############################################################################
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@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):
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"""
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("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)
target_hypervisor = zk.get('/domains/{}/lasthypervisor'.format(dom_uuid))[0].decode('ascii')
if target_hypervisor == '':
click.echo('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 search
###############################################################################
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@click.command(name='search', short_help='Search for a VM object')
@click.option(
'-n', '--name', 'dom_name',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=[{ 'function': 'dom_uuid', 'argument': '--uuid' }],
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help='Search for this human-readable name.'
)
@click.option(
'-u', '--uuid', 'dom_uuid',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=[{ 'function': 'dom_name', 'argument': '--name' }],
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help='Search for this UUID.'
)
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@click.option(
'-l', '--long', 'long_output', is_flag=True, default=False,
help='Display more detailed information.'
)
def search(dom_name, dom_uuid, long_output):
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"""
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("You must specify either a `--name` or `--uuid` value.")
return
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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)
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information = pvcf.getInformationFromXML(zk, dom_uuid, long_output)
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if information == None:
click.echo('Could not find a domain matching that name or UUID.')
return
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click.echo(information)
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pvcf.stopZKConnection(zk)
###############################################################################
# pvc init
###############################################################################
@click.command(name='init', short_help='Initialize a new cluster')
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@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
"""
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click.echo('Initializing a new cluster with Zookeeper address "{}".'.format(zk_host))
# Open a Zookeeper connection
zk = pvcf.startZKConnection(zk_host)
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# 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)
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click.echo('Successfully initialized new cluster. Any running PVC daemons will need to be restarted.')
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###############################################################################
# pvc
###############################################################################
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@click.group(context_settings=CONTEXT_SETTINGS)
@click.option(
'-z', '--zookeeper', '_zk_host', envvar='PVC_ZOOKEEPER', default='{}:2181'.format(this_host), show_default=True,
help='Zookeeper connection string.'
)
def cli(_zk_host):
"""
Parallel Virtual Cluster CLI management tool
"""
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global zk_host
zk_host = _zk_host
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#
# Click command tree
#
node.add_command(flush_host)
node.add_command(ready_host)
vm.add_command(define_vm)
vm.add_command(start_vm)
vm.add_command(shutdown_vm)
vm.add_command(stop_vm)
vm.add_command(migrate_vm)
vm.add_command(unmigrate_vm)
cli.add_command(node)
cli.add_command(vm)
cli.add_command(search)
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cli.add_command(init_cluster)
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#
# Main entry point
#
def main():
return cli(obj={})
if __name__ == '__main__':
main()