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Major work on client-side application

This commit is contained in:
Joshua Boniface 2018-06-05 01:39:59 -04:00
parent 715c497b9d
commit b63f6a2958
2 changed files with 511 additions and 20 deletions
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412
pvc.py
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@ -1,43 +1,415 @@
#!/usr/bin/env python3
import kazoo.client, socket, time
import kazoo.client, socket, time, click
import pvcf
from lxml import objectify
def help():
print("pvc - Parallel Virtual Cluster command-line utility")
zk_host = '127.0.0.1:2181'
def define_domain(domxmlfile):
this_host = socket.gethostname()
CONTEXT_SETTINGS = dict(help_option_names=['-h', '--help'])
# 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)
domuuid = parsed_xml.uuid
print('Adding domain %s to database' % domuuid)
domuuid = parsed_xml.uuid.text
domname = parsed_xml.name.text
print('Adding new VM with Name %s and UUID %s to database' % (domname, domuuid))
zk = kazoo.client.KazooClient(hosts='127.0.0.1:2181')
zk.start()
zk = pvcf.startZKConnection(zk_host)
transaction = zk.transaction()
transaction.create('/domains/%s' % domuuid, "".encode('ascii'))
transaction.create('/domains/%s/state' % domuuid, "stop".encode('ascii'))
transaction.create('/domains/%s/hypervisor' % domuuid, socket.gethostname().encode('ascii'))
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/formerhypervisor' % domuuid, ''.encode('ascii'))
transaction.create('/domains/%s/name' % domuuid, data.encode('ascii'))
transaction.create('/domains/%s/xml' % domuuid, data.encode('ascii'))
results = transaction.commit()
zk.stop()
zk.close()
print(results)
pvcf.stopZKConnection(zk)
def migrate_domain(domuuid, target):
zk = kazoo.client.KazooClient(hosts='127.0.0.1:2181')
zk.start()
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/formerhypervisor' % domuuid)
transaction.delete('/domains/%s/xml' % domuuid)
transaction.delete('/domains/%s' % domuuid)
results = transaction.commit()
print(results)
pvcf.stopZKConnection(zk)
# Start up a domain
def start_domain(domuuid):
zk = pvcf.startZKConnection(zk_host)
transaction = zk.transaction()
transaction.set_data('/domains/%s/state' % domuuid, 'start'.encode('ascii'))
results = transaction.commit()
print(results)
pvcf.stopZKConnection(zk)
# Shut down a domain
def shutdown_domain(domuuid):
zk = pvcf.startZKConnection(zk_host)
transaction = zk.transaction()
transaction.set_data('/domains/%s/state' % domuuid, 'shutdown'.encode('ascii'))
results = transaction.commit()
print(results)
pvcf.stopZKConnection(zk)
# Stop a domain
def stop_domain(domuuid):
zk = pvcf.startZKConnection(zk_host)
transaction = zk.transaction()
transaction.set_data('/domains/%s/state' % domuuid, 'stop'.encode('ascii'))
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')
former_hypervisor = zk.get('/domains/%s/formerhypervisor' % domuuid)[0].decode('ascii')
if former_hypervisor != '':
print('The VM %s has been previously migrated from %s to %s. You must unmigrate it before migrating it again!' % (domuuid, former_hypervisor, current_hypervisor))
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.encode('ascii'))
transaction.set_data('/domains/%s/hypervisor' % domuuid, target_hypervisor.encode('ascii'))
transaction.set_data('/domains/%s/formerhypervisor' % domuuid, current_hypervisor.encode('ascii'))
results = transaction.commit()
zk.stop()
zk.close()
print(results)
pvcf.stopZKConnection(zk)
# Unmigrate VM back from previous hypervisor
def unmigrate_domain(domuuid):
zk = pvcf.startZKConnection(zk_host)
target_hypervisor = zk.get('/domains/%s/formerhypervisor' % domuuid)[0].decode('ascii')
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))
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/formerhypervisor' % domuuid, ''.encode('ascii'))
results = transaction.commit()
print(results)
pvcf.stopZKConnection(zk)
define_domain('/var/home/joshua/debian9.xml')
########################
########################
## ##
## 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=["dom_uuid"],
help='Search for this human-readable name.'
)
@click.option(
'-u', '--uuid', 'dom_uuid',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=["dom_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("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)
# Set the VM to start
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=["dom_uuid"],
help='Search for this human-readable name.'
)
@click.option(
'-u', '--uuid', 'dom_uuid',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=["dom_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("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)
# Set the VM to start
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=["dom_uuid"],
help='Search for this human-readable name.'
)
@click.option(
'-u', '--uuid', 'dom_uuid',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=["dom_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("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)
# Set the VM to start
zk.set('/domains/%s/state' % dom_uuid, 'stop'.encode('ascii'))
# Close the zookeeper connection
pvcf.stopZKConnection(zk)
@click.command(name='migrate', short_help='Migrate a virtual machine to another node.')
def migrate_vm():
"""
Migrate a running virtual machine, via live migration if possible, to another hypervisor node.
"""
pass
@click.command(name='unmigrate', short_help='Restore a migrated virtual machine to its original node.')
def unmigrate_vm():
"""
Restore a previously migrated virtual machine, via live migration if possible, to its original hypervisor node.
"""
pass
#
# Search-level commands
#
@click.command(name='search', short_help='Search for a VM object')
@click.option(
'-n', '--name', 'dom_name',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=["dom_uuid"],
help='Search for this human-readable name.'
)
@click.option(
'-u', '--uuid', 'dom_uuid',
cls=pvcf.MutuallyExclusiveOption,
mutually_exclusive=["dom_name"],
help='Search for this UUID.'
)
def search(dom_name, dom_uuid):
"""
Search the cluster for a virtual machine's information.
"""
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)
pvcf.stopZKConnection(zk)
#define_domain('/var/home/joshua/debian9.xml')
#start_domain('b1dc4e21-544f-47aa-9bb7-8af0bc443b78')
#stop_domain('b1dc4e21-544f-47aa-9bb7-8af0bc443b78')
#migrate_domain('b1dc4e21-544f-47aa-9bb7-8af0bc443b78', 'test1.i.bonilan.net')
#migrate_domain('b1dc4e21-544f-47aa-9bb7-8af0bc443b78', 'test2.i.bonilan.net')
#unmigrate_domain('b1dc4e21-544f-47aa-9bb7-8af0bc443b78')
@click.command()
def help():
print('pvc - Parallel Virtual Cluster command-line utility')
@click.group(context_settings=CONTEXT_SETTINGS)
def cli():
"""Parallel Virtual Cluster CLI management tool"""
pass
#
# Click command tree
#
node.add_command(flush_host)
node.add_command(ready_host)
#node.add_command(get_details)
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)
#vm.add_command(get_details)
cli.add_command(node)
cli.add_command(vm)
cli.add_command(search)
#
# Main entry point
#
def main():
return cli(obj={})
if __name__ == '__main__':
main()

119
pvcf.py
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@ -1,6 +1,10 @@
#!/usr/bin/env python3
import os, sys, libvirt, uuid
import kazoo.client
import lxml
import click
#from click import command, option, Option, UsageError
#
# Generic function helpers for PVC
@ -42,3 +46,118 @@ def lookupByUUID(tuuid):
# Return the dom object (or None)
return dom
#
# Connect and disconnect from Zookeeper
#
def startZKConnection(zk_host):
zk = kazoo.client.KazooClient(hosts=zk_host)
zk.start()
return zk
def stopZKConnection(zk):
zk.stop()
zk.close()
return 0
#
# XML information parsing functions
#
def getInformationFromXML(zk, uuid):
# Obtain the contents of the XML from Zookeeper
xml = zk.get('/domains/%s/xml' % uuid)[0].decode('ascii')
# Parse XML using lxml.objectify
parsed_xml = lxml.objectify.fromstring(xml)
# Now get the information we want from it
dmemory = parsed_xml.memory
dmemory_unit = parsed_xml.memory.attrib['unit']
dcurrentMemory = parsed_xml.currentMemory
dcurrentMemory_unit = parsed_xml.currentMemory.attrib['unit']
dvcpu = parsed_xml.vcpu
dtype = parsed_xml.os.type
darch = parsed_xml.os.type.attrib['arch']
dmachine = parsed_xml.os.type.attrib['machine']
dfeatures = []
for feature in parsed_xml.features.getchildren():
dfeatures.append(feature.tag)
ddisks = []
for disk in parsed_xml.devices.disk.getchildren():
ddisks.append(disk.attrib)
print(ddisks)
return None
#
# Cluster search functions
#
def getClusterDomainList(zk):
# Get a list of UUIDs by listing the children of /domains
uuid_list = zk.get_children('/domains')
name_list = []
# For each UUID, get the corresponding name from the data
for uuid in uuid_list:
name_list.append(zk.get('/domains/%s' % uuid)[0].decode('ascii'))
return uuid_list, name_list
def searchClusterByUUID(zk, uuid):
try:
# Get the lists
uuid_list, name_list = getClusterDomainList(zk)
# 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, None
return name
def searchClusterByName(zk, name):
try:
# Get the lists
uuid_list, name_list = getClusterDomainList(zk)
# 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, None
return uuid
#
# Allow mutually exclusive options in Click
#
class MutuallyExclusiveOption(click.Option):
def __init__(self, *args, **kwargs):
self.mutually_exclusive = set(kwargs.pop('mutually_exclusive', []))
help = kwargs.get('help', '')
if self.mutually_exclusive:
ex_str = ', '.join(self.mutually_exclusive)
kwargs['help'] = help + (
' NOTE: This argument is mutually exclusive with '
'arguments: [' + ex_str + '].'
)
super(MutuallyExclusiveOption, self).__init__(*args, **kwargs)
def handle_parse_result(self, ctx, opts, args):
if self.mutually_exclusive.intersection(opts) and self.name in opts:
raise click.UsageError(
"Illegal usage: `{}` is mutually exclusive with "
"arguments `{}`.".format(
self.name,
', '.join(self.mutually_exclusive)
)
)
return super(MutuallyExclusiveOption, self).handle_parse_result(
ctx,
opts,
args
)