Initial commit
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#!/usr/bin/env python3
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import os, time, uuid, libvirt, kazoo.client
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class VMInstance:
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def __init__(self, domuuid, zk, thishypervisor):
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# Passed-in variables on creation
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self.domuuid = domuuid
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self.zkey = '/domains/%s' % domuuid
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self.zk = zk
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self.thishypervisor = thishypervisor
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# These will all be set later
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self.hypervisor = None
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self.state = None
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self.dom = None
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# Watch for changes to the hypervisor field in Zookeeper
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@zk.DataWatch(self.zkey + '/hypervisor')
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def watch_hypervisor(data, stat):
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self.hypervisor = data.decode('ascii')
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print("Version: %s, data: %s" % (stat.version, data.decode('ascii')))
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self.manage_vm_state()
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# Watch for changes to the state field in Zookeeper
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@zk.DataWatch(self.zkey + '/state')
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def watch_state(data, stat):
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self.state = data.decode('ascii')
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print("Version: %s, data: %s" % (stat.version, self.state))
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self.manage_vm_state()
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# Start up the VM
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def start_vm(self, conn, xmlconfig):
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print("Starting VM %s" % self.domuuid)
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dom = conn.createXML(xmlconfig, 0)
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if dom == None:
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print('Failed to create a domain from an XML definition.')
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exit(1)
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return dom
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# Stop the VM forcibly
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def stop_vm(self):
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print("Forcibly stopping VM %s" % self.domuuid)
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self.dom.destroy()
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# Shutdown the VM gracefully
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def shutdown_vm(self):
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print("Stopping VM %s" % self.domuuid)
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self.dom.shutdown()
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# Migrate the VM to a target host
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def migrate_vm(self):
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self.zk.set(self.zkey + '/status', b'migrate')
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dest_conn = libvirt.open('qemu+ssh://%s/system' % target)
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if dest_conn == None:
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print('Failed to open connection to qemu+ssh://%s/system' % target)
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exit(1)
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target_dom = self.dom.migrate(dest_conn, libvirt.VIR_MIGRATE_LIVE, None, None, 0)
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if target_dom == None:
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print('Could not migrate to the new domain')
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exit(1)
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print('Migrated successfully')
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dest_conn.close()
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# Receive the migration from another host (wait until VM is running)
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def receive_migrate(self):
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while True:
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if self.dom.state() != libvirt.VIR_DOMAIN_RUNNING:
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continue
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else:
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self.zk.set(self.zkey + '/status', b'start')
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break
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#
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# Main function to manage a VM (taking only self)
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#
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def manage_vm_state(self):
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# Start up a new Libvirt connection
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libvirt_name = "qemu:///system"
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conn = libvirt.open(libvirt_name)
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if conn == None:
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print('Failed to open local libvirt connection.')
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exit(1)
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# Check the current state of the VM
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try:
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self.dom = conn.lookupByUUID(uuid.UUID(self.domuuid).bytes)
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running = self.dom.state()
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except:
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running = False
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if running != False and self.state == "stop" and self.hypervisor == self.thishypervisor:
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self.stop_vm()
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if running != False and self.state == "shutdown" and self.hypervisor == self.thishypervisor:
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self.shutdown_vm()
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elif running == False and self.state == "migrate" and self.hypervisr == self.thishypervisor:
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self.receive_migrate()
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elif running != False and self.state == "migrate" and self.hypervisr != self.thishypervisor:
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self.migrate_vm()
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elif running == False and self.state == "start" and self.hypervisor == self.thishypervisor:
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# Grab the domain information from Zookeeper
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domxml, domxmlstat = self.zk.get(self.zkey + '/xml')
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domxml = str(domxml.decode('ascii'))
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self.dom = self.start_vm(conn, domxml)
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# The VM should now be running so return the domain and active connection
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conn.close
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#!/usr/bin/env python3
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def help():
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print("pvc - Parallel Virtual Cluster command-line utility")
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help()
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#!/usr/bin/env python3
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from kazoo.client import KazooClient
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from kazoo.client import KazooState
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import libvirt
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import sys
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import uuid
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import VMInstance
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import time
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def help():
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print("pvcd - Parallel Virtual Cluster management daemon")
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# exit(0)
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help()
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# Connect to zookeeper
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zk = KazooClient(hosts='127.0.0.1:2181')
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try:
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zk.start()
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except:
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print("Failed to connect to local Zookeeper instance")
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exit(1)
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def zk_listener(state):
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if state == KazooState.LOST:
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# Register somewhere that the session was lost
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pass
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elif state == KazooState.SUSPENDED:
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# Handle being disconnected from Zookeeper
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pass
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else:
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# Handle being connected/reconnected to Zookeeper
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pass
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zk.add_listener(zk_listener)
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# Connect to libvirt
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libvirt_name = "qemu:///system"
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conn = libvirt.open(libvirt_name)
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if conn == None:
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print('Failed to open connection to %s' % libvirt_name)
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exit(1)
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# Gather data about hypervisor
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hostname = conn.getHostname()
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nodeinfo = conn.getInfo()
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numnodes = nodeinfo[4]
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memlistNUMA = conn.getCellsFreeMemory(0, numnodes)
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memlistTOTAL = conn.getFreeMemory()
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print("Node hostname: %s" % hostname)
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print("Free memory: %s" % memlistTOTAL)
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cell = 0
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for cellfreemem in memlistNUMA:
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print('NUMA Node '+str(cell)+': '+str(cellfreemem)+' bytes free memory')
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cell += 1
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print('Virtualization type: '+conn.getType())
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uri = conn.getURI()
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print('Canonical URI: '+uri)
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print()
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map = conn.getCPUMap()
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print("CPUs: " + str(map[0]))
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print("Available: " + str(map[1]))
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print()
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def start_vm(vmname):
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print("Starting VM %s" % vmname)
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vm = VMInstance.VMInstance('b1dc4e21-544f-47aa-9bb7-8af0bc443b78', zk, hostname);
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while True:
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# Tick loop
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time.sleep(1)
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pass
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conn.close()
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zk.stop()
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