#!/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 # # 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 . # ############################################################################### 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', 'node_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(node_name, long_output): """ Search the cluster for a node's information. """ # 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) # Get information about node in a pretty format information = pvcf.getInformationFromNode(zk, node_name, long_output) if information == None: click.echo('ERROR: Could not find a domain matching that name or UUID.') return click.echo(information) if long_output == True: click.echo('') click.echo('{}Virtual machines on node:{}'.format(ansiiprint.bold(), ansiiprint.end())) click.echo('') # List all VMs on this node _vm_list(node_name) # Close the Zookeeper connection pvcf.stopZKConnection(zk) ############################################################################### # pvc node list ############################################################################### @click.command(name='list', short_help='List all Node objects') def node_list(): """ List all hypervisor nodes in the cluster. """ # Open a Zookeeper connection zk = pvcf.startZKConnection(zk_host) node_list = zk.get_children('/nodes') node_list_output = [] node_daemon_state = {} node_daemon_state = {} node_domain_state = {} node_cpu_count = {} node_mem_used = {} node_mem_free = {} node_mem_total = {} node_domains_count = {} node_running_domains = {} node_mem_allocated = {} # Gather information for printing for node_name in node_list: node_daemon_state[node_name] = zk.get('/nodes/{}/daemonstate'.format(node_name))[0].decode('ascii') node_domain_state[node_name] = zk.get('/nodes/{}/domainstate'.format(node_name))[0].decode('ascii') node_cpu_count[node_name] = zk.get('/nodes/{}/staticdata'.format(node_name))[0].decode('ascii').split()[0] node_mem_used[node_name] = zk.get('/nodes/{}/memused'.format(node_name))[0].decode('ascii') node_mem_free[node_name] = zk.get('/nodes/{}/memfree'.format(node_name))[0].decode('ascii') node_mem_total[node_name] = int(node_mem_used[node_name]) + int(node_mem_free[node_name]) node_domains_count[node_name] = zk.get('/nodes/{}/domainscount'.format(node_name))[0].decode('ascii') node_running_domains[node_name] = zk.get('/nodes/{}/runningdomains'.format(node_name))[0].decode('ascii').split() node_mem_allocated[node_name] = 0 for domain in node_running_domains[node_name]: parsed_xml = pvcf.getDomainXML(zk, domain) duuid, dname, dmemory, dvcpu, dvcputopo = pvcf.getDomainMainDetails(parsed_xml) node_mem_allocated[node_name] += int(dmemory) # Determine optimal column widths # Dynamic columns: node_name, hypervisor, migrated node_name_length = 0 for node_name in node_list: # node_name column _node_name_length = len(node_name) + 1 if _node_name_length > node_name_length: node_name_length = _node_name_length # Format the string (header) node_list_output.append( '{bold}{node_name: <{node_name_length}} \ State: {daemon_state_colour}{node_daemon_state: <7}{end_colour} {domain_state_colour}{node_domain_state: <8}{end_colour} \ Resources: {node_domains_count: <4} {node_cpu_count: <5} \ RAM (MiB): {node_mem_total: <6} {node_mem_used: <6} {node_mem_free: <6} {node_mem_allocated: <6}{end_bold}'.format( node_name_length=node_name_length, bold=ansiiprint.bold(), end_bold=ansiiprint.end(), daemon_state_colour='', domain_state_colour='', end_colour='', node_name='Name', node_daemon_state='Daemon', node_domain_state='Domains', node_domains_count='VMs', node_cpu_count='CPUs', node_mem_total='Total', node_mem_used='Used', node_mem_free='Free', node_mem_allocated='VMs' ) ) # Format the string (elements) for node_name in node_list: if node_daemon_state[node_name] == 'run': daemon_state_colour = ansiiprint.green() elif node_daemon_state[node_name] == 'stop': daemon_state_colour = ansiiprint.red() elif node_daemon_state[node_name] == 'init': daemon_state_colour = ansiiprint.yellow() elif node_daemon_state[node_name] == 'dead': daemon_state_colour = ansiiprint.red() + ansiiprint.bold() else: daemon_state_colour = ansiiprint.blue() if node_domain_state[node_name] == 'ready': domain_state_colour = ansiiprint.green() else: domain_state_colour = ansiiprint.blue() node_list_output.append( '{bold}{node_name: <{node_name_length}} \ {daemon_state_colour}{node_daemon_state: <7}{end_colour} {domain_state_colour}{node_domain_state: <8}{end_colour} \ {node_domains_count: <4} {node_cpu_count: <5} \ {node_mem_total: <6} {node_mem_used: <6} {node_mem_free: <6} {node_mem_allocated: <6}{end_bold}'.format( node_name_length=node_name_length, bold='', end_bold='', daemon_state_colour=daemon_state_colour, domain_state_colour=domain_state_colour, end_colour=ansiiprint.end(), node_name=node_name, node_daemon_state=node_daemon_state[node_name], node_domain_state=node_domain_state[node_name], node_domains_count=node_domains_count[node_name], node_cpu_count=node_cpu_count[node_name], node_mem_total=node_mem_total[node_name], node_mem_used=node_mem_used[node_name], node_mem_free=node_mem_free[node_name], node_mem_allocated=node_mem_allocated[node_name] ) ) click.echo('\n'.join(sorted(node_list_output))) # Close the Zookeeper connection pvcf.stopZKConnection(zk) ############################################################################### # 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 restart ############################################################################### @click.command(name='restart', short_help='Restart 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): """ Restart 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('Restarting VM "{}".'.format(dom_uuid)) zk.set('/domains/%s/state' % dom_uuid, 'restart'.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 != 'run' 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): _vm_list(hypervisor) # Wrapped function to allow calling from `node info` def _vm_list(hypervisor): """ List all virtual machines in the cluster. """ # Open a Zookeeper connection zk = pvcf.startZKConnection(zk_host) vm_list_raw = zk.get_children('/domains') vm_list = [] vm_list_output = [] vm_hypervisor = {} vm_state = {} vm_migrated = {} vm_uuid = {} vm_name = {} vm_memory = {} vm_vcpu = {} # If we're limited, remove other nodes' VMs for vm in vm_list_raw: # Check hypervisor to avoid unneeded ZK calls vm_hypervisor[vm] = zk.get('/domains/{}/hypervisor'.format(vm))[0].decode('ascii') if hypervisor != None: if vm_hypervisor[vm] == hypervisor: vm_list.append(vm) else: vm_list.append(vm) # Gather information for printing for vm in vm_list: vm_state[vm] = 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[vm] = 'from {}'.format(vm_lasthypervisor) else: vm_migrated[vm] = 'no' vm_xml = pvcf.getDomainXML(zk, vm) vm_uuid[vm], vm_name[vm], vm_memory[vm], vm_vcpu[vm], vm_vcputopo = pvcf.getDomainMainDetails(vm_xml) # Determine optimal column widths # Dynamic columns: node_name, hypervisor, migrated vm_name_length = 0 vm_hypervisor_length = 0 vm_migrated_length = 0 for vm in vm_list: # vm_name column _vm_name_length = len(vm_name[vm]) + 1 if _vm_name_length > vm_name_length: vm_name_length = _vm_name_length # vm_hypervisor column _vm_hypervisor_length = len(vm_hypervisor[vm]) + 1 if _vm_hypervisor_length > vm_hypervisor_length: vm_hypervisor_length = _vm_hypervisor_length # vm_migrated column _vm_migrated_length = len(vm_migrated[vm]) + 1 if _vm_migrated_length > vm_migrated_length: vm_migrated_length = _vm_migrated_length # Format the string (header) vm_list_header = ansiiprint.bold() + 'Name UUID State RAM [MiB] vCPUs Hypervisor Migrated?' + ansiiprint.end() vm_list_output.append( '{bold}{vm_name: <{vm_name_length}} {vm_uuid: <37} \ {vm_state_colour}{vm_state: <8}{end_colour} \ {vm_memory: <10} {vm_vcpu: <6} \ {vm_hypervisor: <{vm_hypervisor_length}} \ {vm_migrated: <{vm_migrated_length}}{end_bold}'.format( vm_name_length=vm_name_length, vm_hypervisor_length=vm_hypervisor_length, vm_migrated_length=vm_migrated_length, bold=ansiiprint.bold(), end_bold=ansiiprint.end(), vm_state_colour='', end_colour='', vm_name='Name', vm_uuid='UUID', vm_state='State', vm_memory='RAM (MiB)', vm_vcpu='vCPUs', vm_hypervisor='Hypervisor', vm_migrated='Migrated' ) ) # Format the string (elements) for vm in vm_list: if vm_state[vm] == 'start': vm_state_colour = ansiiprint.green() elif vm_state[vm] == 'stop': vm_state_colour = ansiiprint.red() elif vm_state[vm] == 'restart': vm_state_colour = ansiiprint.yellow() else: vm_state_colour = ansiiprint.blue() vm_list_output.append( '{bold}{vm_name: <{vm_name_length}} {vm_uuid: <37} \ {vm_state_colour}{vm_state: <8}{end_colour} \ {vm_memory: <10} {vm_vcpu: <6} \ {vm_hypervisor: <{vm_hypervisor_length}} \ {vm_migrated: <{vm_migrated_length}}{end_bold}'.format( vm_name_length=vm_name_length, vm_hypervisor_length=vm_hypervisor_length, vm_migrated_length=vm_migrated_length, bold='', end_bold='', vm_state_colour=vm_state_colour, end_colour=ansiiprint.end(), vm_name=vm_name[vm], vm_uuid=vm_uuid[vm], vm_state=vm_state[vm], vm_memory=vm_memory[vm], vm_vcpu=vm_vcpu[vm], vm_hypervisor=vm_hypervisor[vm], vm_migrated=vm_migrated[vm] ) ) click.echo('\n'.join(sorted(vm_list_output))) # Close the Zookeeper connection pvcf.stopZKConnection(zk) ############################################################################### # 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(restart_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()