Major work on client-side application
This commit is contained in:
parent
715c497b9d
commit
b63f6a2958
412
pvc.py
412
pvc.py
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@ -1,43 +1,415 @@
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#!/usr/bin/env python3
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import kazoo.client, socket, time
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import kazoo.client, socket, time, click
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import pvcf
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from lxml import objectify
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def help():
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print("pvc - Parallel Virtual Cluster command-line utility")
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zk_host = '127.0.0.1:2181'
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def define_domain(domxmlfile):
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this_host = socket.gethostname()
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CONTEXT_SETTINGS = dict(help_option_names=['-h', '--help'])
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# Creates a new domain based on an XML file
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def define_domain(domxmlfile, target_hypervisor):
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with open(domxmlfile, 'r') as f_domxmlfile:
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data = f_domxmlfile.read()
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f_domxmlfile.close()
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parsed_xml = objectify.fromstring(data)
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domuuid = parsed_xml.uuid
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print('Adding domain %s to database' % domuuid)
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domuuid = parsed_xml.uuid.text
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domname = parsed_xml.name.text
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print('Adding new VM with Name %s and UUID %s to database' % (domname, domuuid))
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zk = kazoo.client.KazooClient(hosts='127.0.0.1:2181')
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zk.start()
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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, "".encode('ascii'))
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transaction.create('/domains/%s/state' % domuuid, "stop".encode('ascii'))
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transaction.create('/domains/%s/hypervisor' % domuuid, socket.gethostname().encode('ascii'))
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transaction.create('/domains/%s' % domuuid, domname.encode('ascii'))
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transaction.create('/domains/%s/state' % domuuid, 'stop'.encode('ascii'))
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transaction.create('/domains/%s/hypervisor' % domuuid, target_hypervisor.encode('ascii'))
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transaction.create('/domains/%s/formerhypervisor' % 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'))
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results = transaction.commit()
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zk.stop()
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zk.close()
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print(results)
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pvcf.stopZKConnection(zk)
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def migrate_domain(domuuid, target):
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zk = kazoo.client.KazooClient(hosts='127.0.0.1:2181')
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zk.start()
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def delete_domain(domuuid):
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zk = pvcf.startZKConnection(zk_host)
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# Set the domain into delete mode
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transaction = zk.transaction()
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transaction.set_data('/domains/%s/state' % domuuid, 'delete'.encode('ascii'))
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results = transaction.commit()
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print(results)
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# Wait for 3 seconds to allow state to flow to all hypervisors
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time.sleep(3)
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# Delete the configurations
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transaction = zk.transaction()
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transaction.delete('/domains/%s/state' % domuuid)
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transaction.delete('/domains/%s/hypervisor' % domuuid)
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transaction.delete('/domains/%s/formerhypervisor' % domuuid)
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transaction.delete('/domains/%s/xml' % domuuid)
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transaction.delete('/domains/%s' % domuuid)
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results = transaction.commit()
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print(results)
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pvcf.stopZKConnection(zk)
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# Start up a domain
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def start_domain(domuuid):
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zk = pvcf.startZKConnection(zk_host)
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transaction = zk.transaction()
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transaction.set_data('/domains/%s/state' % domuuid, 'start'.encode('ascii'))
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results = transaction.commit()
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print(results)
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pvcf.stopZKConnection(zk)
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# Shut down a domain
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def shutdown_domain(domuuid):
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zk = pvcf.startZKConnection(zk_host)
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transaction = zk.transaction()
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transaction.set_data('/domains/%s/state' % domuuid, 'shutdown'.encode('ascii'))
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results = transaction.commit()
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print(results)
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pvcf.stopZKConnection(zk)
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# Stop a domain
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def stop_domain(domuuid):
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zk = pvcf.startZKConnection(zk_host)
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transaction = zk.transaction()
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transaction.set_data('/domains/%s/state' % domuuid, 'stop'.encode('ascii'))
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results = transaction.commit()
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print(results)
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pvcf.stopZKConnection(zk)
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# Migrate VM to target_hypervisor
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def migrate_domain(domuuid, target_hypervisor):
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zk = pvcf.startZKConnection(zk_host)
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current_hypervisor = zk.get('/domains/%s/hypervisor' % domuuid)[0].decode('ascii')
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former_hypervisor = zk.get('/domains/%s/formerhypervisor' % domuuid)[0].decode('ascii')
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if former_hypervisor != '':
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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))
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pvcf.stopZKConnection(zk)
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return
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print('Migrating VM with UUID %s from hypervisor %s to hypervisor %s' % (domuuid, current_hypervisor, 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.encode('ascii'))
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transaction.set_data('/domains/%s/hypervisor' % domuuid, target_hypervisor.encode('ascii'))
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transaction.set_data('/domains/%s/formerhypervisor' % domuuid, current_hypervisor.encode('ascii'))
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results = transaction.commit()
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zk.stop()
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zk.close()
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print(results)
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pvcf.stopZKConnection(zk)
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# Unmigrate VM back from previous hypervisor
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def unmigrate_domain(domuuid):
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zk = pvcf.startZKConnection(zk_host)
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target_hypervisor = zk.get('/domains/%s/formerhypervisor' % domuuid)[0].decode('ascii')
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if target_hypervisor == '':
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print('The VM %s has not been previously migrated and cannot be unmigrated.' % domuuid)
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pvcf.stopZKConnection(zk)
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return
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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'))
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transaction.set_data('/domains/%s/formerhypervisor' % domuuid, ''.encode('ascii'))
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results = transaction.commit()
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print(results)
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pvcf.stopZKConnection(zk)
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define_domain('/var/home/joshua/debian9.xml')
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########################
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########################
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## ##
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## CLICK COMPONENTS ##
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## ##
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########################
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########################
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###############################################################################
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# pvc node
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###############################################################################
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@click.group(name='node', short_help='Manage a PVC hypervisor node', context_settings=CONTEXT_SETTINGS)
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@click.option(
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'-n', '--name', 'node_name', default=this_host, show_default=True,
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help='The PVC node to operate on.'
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)
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def node():
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"""
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Manage the state of a node in the PVC cluster.
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Notes:
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* 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!
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"""
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pass
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###############################################################################
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# pvc node flush
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###############################################################################
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@click.command(name='flush', short_help='Take a node out of service')
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def flush_host():
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"""
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Take a node out of active service and migrate away all VMs.
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"""
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pass
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###############################################################################
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# pvc node ready
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###############################################################################
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@click.command(name='ready', short_help='Restore node to service')
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def ready_host():
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"""
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Restore a host to active service and migrate back all VMs.
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"""
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pass
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###############################################################################
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# pvc vm
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###############################################################################
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@click.group(name='vm', short_help='Manage a PVC virtual machine', context_settings=CONTEXT_SETTINGS)
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def vm():
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"""
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Manage the state of a virtual machine in the PVC cluster.
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Notes:
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* PVC virtual machines are always managed by UUID. To find a name-to-UUID mapping, use the 'search' command.
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"""
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pass
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###############################################################################
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# pvc vm define
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###############################################################################
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@click.command(name='define', short_help='Define a new virtual machine from a Libvirt XML file.')
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@click.option(
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'-x', '--xml', 'xml_config_file',
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help='The XML config file to define the domain from.'
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)
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@click.option(
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'-v', '--hypervisor', 'target_hypervisor', default=this_host, show_default=True,
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help='The home hypervisor for this domain.'
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)
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def define_vm(xml_config_file, target_hypervisor):
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"""
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Define a new virtual machine from a Libvirt XML configuration file.
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Notes:
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* 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!
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"""
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define_domain(xml_config_file, target_hypervisor)
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###############################################################################
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# pvc vm start
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###############################################################################
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@click.command(name='start', short_help='Start up a defined virtual machine.')
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@click.option(
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'-n', '--name', 'dom_name',
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cls=pvcf.MutuallyExclusiveOption,
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mutually_exclusive=["dom_uuid"],
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help='Search for this human-readable name.'
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)
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@click.option(
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'-u', '--uuid', 'dom_uuid',
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cls=pvcf.MutuallyExclusiveOption,
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mutually_exclusive=["dom_name"],
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help='Search for this UUID.'
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)
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def start_vm(dom_name, dom_uuid):
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"""
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Start up a virtual machine on its configured hypervisor.
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"""
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# Ensure at least one search method is set
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if dom_name == None and dom_uuid == None:
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click.echo("You must specify either a '--name' or '--uuid' value.")
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return
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# Open a Zookeeper connection
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zk = pvcf.startZKConnection(zk_host)
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# If the --name value was passed, get the UUID
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if dom_name != None:
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dom_uuid = pvcf.searchClusterByName(zk, dom_name)
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# Set the VM to start
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zk.set('/domains/%s/state' % dom_uuid, 'start'.encode('ascii'))
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# Close the zookeeper connection
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pvcf.stopZKConnection(zk)
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###############################################################################
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# pvc vm shutdown
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###############################################################################
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@click.command(name='shutdown', short_help='Gracefully shut down a running virtual machine.')
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@click.option(
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'-n', '--name', 'dom_name',
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cls=pvcf.MutuallyExclusiveOption,
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mutually_exclusive=["dom_uuid"],
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help='Search for this human-readable name.'
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)
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@click.option(
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'-u', '--uuid', 'dom_uuid',
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cls=pvcf.MutuallyExclusiveOption,
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mutually_exclusive=["dom_name"],
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help='Search for this UUID.'
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)
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def shutdown_vm(dom_name, dom_uuid):
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"""
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Gracefully shut down a running virtual machine.
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"""
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# Ensure at least one search method is set
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if dom_name == None and dom_uuid == None:
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click.echo("You must specify either a '--name' or '--uuid' value.")
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return
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# Open a Zookeeper connection
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zk = pvcf.startZKConnection(zk_host)
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# If the --name value was passed, get the UUID
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if dom_name != None:
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dom_uuid = pvcf.searchClusterByName(zk, dom_name)
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# Set the VM to start
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zk.set('/domains/%s/state' % dom_uuid, 'shutdown'.encode('ascii'))
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# Close the zookeeper connection
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pvcf.stopZKConnection(zk)
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###############################################################################
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# pvc vm stop
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###############################################################################
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@click.command(name='stop', short_help='Forcibly halt a running virtual machine.')
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@click.option(
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'-n', '--name', 'dom_name',
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cls=pvcf.MutuallyExclusiveOption,
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mutually_exclusive=["dom_uuid"],
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help='Search for this human-readable name.'
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)
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@click.option(
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'-u', '--uuid', 'dom_uuid',
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cls=pvcf.MutuallyExclusiveOption,
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mutually_exclusive=["dom_name"],
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help='Search for this UUID.'
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)
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def stop_vm(dom_name, dom_uuid):
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"""
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Forcibly halt (destroy) a running virtual machine.
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"""
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# Ensure at least one search method is set
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if dom_name == None and dom_uuid == None:
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click.echo("You must specify either a '--name' or '--uuid' value.")
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return
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# Open a Zookeeper connection
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zk = pvcf.startZKConnection(zk_host)
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# If the --name value was passed, get the UUID
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if dom_name != None:
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dom_uuid = pvcf.searchClusterByName(zk, dom_name)
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# Set the VM to start
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zk.set('/domains/%s/state' % dom_uuid, 'stop'.encode('ascii'))
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# Close the zookeeper connection
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pvcf.stopZKConnection(zk)
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@click.command(name='migrate', short_help='Migrate a virtual machine to another node.')
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def migrate_vm():
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"""
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Migrate a running virtual machine, via live migration if possible, to another hypervisor node.
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"""
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pass
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@click.command(name='unmigrate', short_help='Restore a migrated virtual machine to its original node.')
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def unmigrate_vm():
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"""
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Restore a previously migrated virtual machine, via live migration if possible, to its original hypervisor node.
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"""
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pass
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#
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# Search-level commands
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#
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@click.command(name='search', short_help='Search for a VM object')
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@click.option(
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'-n', '--name', 'dom_name',
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cls=pvcf.MutuallyExclusiveOption,
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mutually_exclusive=["dom_uuid"],
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help='Search for this human-readable name.'
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)
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@click.option(
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'-u', '--uuid', 'dom_uuid',
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cls=pvcf.MutuallyExclusiveOption,
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mutually_exclusive=["dom_name"],
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help='Search for this UUID.'
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)
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def search(dom_name, dom_uuid):
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"""
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Search the cluster for a virtual machine's information.
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"""
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zk = pvcf.startZKConnection(zk_host)
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if dom_name != None:
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dom_uuid = pvcf.searchClusterByName(zk, dom_name)
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if dom_uuid != None:
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dom_name = pvcf.searchClusterByUUID(zk, dom_uuid)
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information = pvcf.getInformationFromXML(zk, dom_uuid)
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pvcf.stopZKConnection(zk)
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#define_domain('/var/home/joshua/debian9.xml')
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#start_domain('b1dc4e21-544f-47aa-9bb7-8af0bc443b78')
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#stop_domain('b1dc4e21-544f-47aa-9bb7-8af0bc443b78')
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#migrate_domain('b1dc4e21-544f-47aa-9bb7-8af0bc443b78', 'test1.i.bonilan.net')
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#migrate_domain('b1dc4e21-544f-47aa-9bb7-8af0bc443b78', 'test2.i.bonilan.net')
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#unmigrate_domain('b1dc4e21-544f-47aa-9bb7-8af0bc443b78')
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@click.command()
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def help():
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print('pvc - Parallel Virtual Cluster command-line utility')
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@click.group(context_settings=CONTEXT_SETTINGS)
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def cli():
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"""Parallel Virtual Cluster CLI management tool"""
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pass
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#
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# Click command tree
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#
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node.add_command(flush_host)
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node.add_command(ready_host)
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#node.add_command(get_details)
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vm.add_command(define_vm)
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vm.add_command(start_vm)
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vm.add_command(shutdown_vm)
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vm.add_command(stop_vm)
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vm.add_command(migrate_vm)
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vm.add_command(unmigrate_vm)
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#vm.add_command(get_details)
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cli.add_command(node)
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cli.add_command(vm)
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cli.add_command(search)
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#
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# Main entry point
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#
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def main():
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return cli(obj={})
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if __name__ == '__main__':
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main()
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119
pvcf.py
119
pvcf.py
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@ -1,6 +1,10 @@
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#!/usr/bin/env python3
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import os, sys, libvirt, uuid
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import kazoo.client
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import lxml
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import click
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#from click import command, option, Option, UsageError
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#
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# Generic function helpers for PVC
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@ -42,3 +46,118 @@ def lookupByUUID(tuuid):
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# Return the dom object (or None)
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return dom
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#
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# Connect and disconnect from Zookeeper
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#
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def startZKConnection(zk_host):
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zk = kazoo.client.KazooClient(hosts=zk_host)
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zk.start()
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return zk
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def stopZKConnection(zk):
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zk.stop()
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zk.close()
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return 0
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#
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# XML information parsing functions
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#
|
||||
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
|
||||
)
|
||||
|
|
Loading…
Reference in New Issue