Joshua M. Boniface
3893666507
1. Remove a number of time.sleep commands which don't really seem necessary any longer and which significantly increased the startup time while parsing the VM list. 2. Handle some variable sets during initialization of the object, rather than waiting for a management command, enabling... 3. Know when a state change, and the corresponding Libvirt lookup, is unnecessary due to the target node not matching the current node. This also removes a number of unremovable errors from Libvirt on the console which were annoying. This reduces the total time taken by the VM startup segment (lines 760-762 of Daemon.py) from 17.117s down to 0.976s for 82 VMs.
475 lines
18 KiB
Python
475 lines
18 KiB
Python
#!/usr/bin/env python3
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# DomainInstance.py - Class implementing a PVC virtual machine in pvcd
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# Part of the Parallel Virtual Cluster (PVC) system
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#
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# Copyright (C) 2018 Joshua M. Boniface <joshua@boniface.me>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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###############################################################################
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import os
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import sys
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import uuid
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import socket
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import time
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import threading
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import libvirt
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import kazoo.client
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import pvcd.log as log
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import pvcd.zkhandler as zkhandler
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import pvcd.DomainConsoleWatcherInstance as DomainConsoleWatcherInstance
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class DomainInstance(object):
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# Initialization function
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def __init__(self, domuuid, zk_conn, config, logger, this_node):
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# Passed-in variables on creation
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self.domuuid = domuuid
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self.zk_conn = zk_conn
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self.config = config
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self.logger = logger
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self.this_node = this_node
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# Get data from zookeeper
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self.domname = zkhandler.readdata(zk_conn, '/domains/{}'.format(domuuid))
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self.state = zkhandler.readdata(self.zk_conn, '/domains/{}/state'.format(self.domuuid))
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self.node = zkhandler.readdata(self.zk_conn, '/domains/{}/node'.format(self.domuuid))
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# These will all be set later
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self.instart = False
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self.inrestart = False
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self.inmigrate = False
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self.inreceive = False
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self.inshutdown = False
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self.instop = False
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# Libvirt domuuid
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self.dom = self.lookupByUUID(self.domuuid)
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# Log watcher instance
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self.console_log_instance = DomainConsoleWatcherInstance.DomainConsoleWatcherInstance(self.domuuid, self.domname, self.zk_conn, self.config, self.logger, self.this_node)
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# Watch for changes to the state field in Zookeeper
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@self.zk_conn.DataWatch('/domains/{}/state'.format(self.domuuid))
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def watch_state(data, stat, event=""):
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if event and event.type == 'DELETED':
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# The key has been deleted after existing before; terminate this watcher
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# because this class instance is about to be reaped in Daemon.py
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return False
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# If we get a delete state, just terminate outselves
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if data == None:
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return
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# Otherwise perform a management command
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else:
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self.manage_vm_state()
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# Get data functions
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def getstate(self):
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return self.state
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def getnode(self):
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return self.node
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def getdom(self):
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return self.dom
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def getmemory(self):
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try:
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memory = int(self.dom.info()[2] / 1024)
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except:
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memory = 0
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return memory
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def getvcpus(self):
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try:
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vcpus = int(self.dom.info()[3])
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except:
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vcpus = 0
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return vcpus
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# Manage local node domain_list
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def addDomainToList(self):
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if not self.domuuid in self.this_node.domain_list:
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try:
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# Add the domain to the domain_list array
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self.this_node.domain_list.append(self.domuuid)
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# Push the change up to Zookeeper
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zkhandler.writedata(self.zk_conn, { '/nodes/{}/runningdomains'.format(self.this_node.name): ' '.join(self.this_node.domain_list) })
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except Exception as e:
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self.logger.out('Error adding domain to list: {}'.format(e), state='c')
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def removeDomainFromList(self):
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if self.domuuid in self.this_node.domain_list:
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try:
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# Remove the domain from the domain_list array
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self.this_node.domain_list.remove(self.domuuid)
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# Push the change up to Zookeeper
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zkhandler.writedata(self.zk_conn, { '/nodes/{}/runningdomains'.format(self.this_node.name): ' '.join(self.this_node.domain_list) })
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except Exception as e:
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self.logger.out('Error removing domain from list: {}'.format(e), state='c')
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# Start up the VM
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def start_vm(self):
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# Start the log watcher
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self.console_log_instance.start()
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self.logger.out('Starting VM', state='i', prefix='Domain {}:'.format(self.domuuid))
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self.instart = True
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# Start up a new Libvirt connection
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libvirt_name = "qemu:///system"
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lv_conn = libvirt.open(libvirt_name)
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if lv_conn == None:
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self.logger.out('Failed to open local libvirt connection', state='e', prefix='Domain {}:'.format(self.domuuid))
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self.instart = False
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return
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# Try to get the current state in case it's already running
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try:
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self.dom = self.lookupByUUID(self.domuuid)
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curstate = self.dom.state()[0]
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except:
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curstate = 'notstart'
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if curstate == libvirt.VIR_DOMAIN_RUNNING:
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# If it is running just update the model
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self.addDomainToList()
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zkhandler.writedata(self.zk_conn, { '/domains/{}/failedreason'.format(self.domuuid): '' })
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else:
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# Or try to create it
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try:
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# Grab the domain information from Zookeeper
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xmlconfig = zkhandler.readdata(self.zk_conn, '/domains/{}/xml'.format(self.domuuid))
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dom = lv_conn.createXML(xmlconfig, 0)
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self.addDomainToList()
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self.logger.out('Successfully started VM', state='o', prefix='Domain {}:'.format(self.domuuid))
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self.dom = dom
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zkhandler.writedata(self.zk_conn, { '/domains/{}/failedreason'.format(self.domuuid): '' })
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except libvirt.libvirtError as e:
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self.logger.out('Failed to create VM', state='e', prefix='Domain {}:'.format(self.domuuid))
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zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'failed' })
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zkhandler.writedata(self.zk_conn, { '/domains/{}/failedreason'.format(self.domuuid): str(e) })
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self.dom = None
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lv_conn.close()
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self.instart = False
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# Restart the VM
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def restart_vm(self):
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self.logger.out('Restarting VM', state='i', prefix='Domain {}:'.format(self.domuuid))
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self.inrestart = True
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# Start up a new Libvirt connection
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libvirt_name = "qemu:///system"
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lv_conn = libvirt.open(libvirt_name)
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if lv_conn == None:
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self.logger.out('Failed to open local libvirt connection', state='e', prefix='Domain {}:'.format(self.domuuid))
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self.inrestart = False
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return
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self.shutdown_vm()
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time.sleep(0.2)
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self.start_vm()
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self.addDomainToList()
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zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'start' })
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lv_conn.close()
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self.inrestart = False
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# Stop the VM forcibly without updating state
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def terminate_vm(self):
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self.logger.out('Terminating VM', state='i', prefix='Domain {}:'.format(self.domuuid))
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self.instop = True
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try:
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self.dom.destroy()
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except AttributeError:
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self.logger.out('Failed to terminate VM', state='e', prefix='Domain {}:'.format(self.domuuid))
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self.removeDomainFromList()
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self.logger.out('Successfully terminated VM', state='o', prefix='Domain {}:'.format(self.domuuid))
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self.dom = None
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self.instop = False
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# Stop the log watcher
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self.console_log_instance.stop()
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# Stop the VM forcibly
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def stop_vm(self):
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self.logger.out('Forcibly stopping VM', state='i', prefix='Domain {}:'.format(self.domuuid))
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self.instop = True
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try:
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self.dom.destroy()
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except AttributeError:
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self.logger.out('Failed to stop VM', state='e', prefix='Domain {}:'.format(self.domuuid))
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self.removeDomainFromList()
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if self.inrestart == False:
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zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'stop' })
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self.logger.out('Successfully stopped VM', state='o', prefix='Domain {}:'.format(self.domuuid))
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self.dom = None
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self.instop = False
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# Stop the log watcher
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self.console_log_instance.stop()
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# Shutdown the VM gracefully
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def shutdown_vm(self):
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self.logger.out('Gracefully stopping VM', state='i', prefix='Domain {}:'.format(self.domuuid))
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self.inshutdown = True
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self.dom.shutdown()
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try:
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tick = 0
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while self.dom.state()[0] == libvirt.VIR_DOMAIN_RUNNING and tick < 60:
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tick += 1
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time.sleep(0.5)
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if tick >= 60:
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self.logger.out('Shutdown timeout expired', state='e', prefix='Domain {}:'.format(self.domuuid))
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self.stop_vm()
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self.inshutdown = False
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return
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except:
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pass
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self.removeDomainFromList()
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if self.inrestart == False:
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zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'stop' })
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self.logger.out('Successfully shutdown VM', state='o', prefix='Domain {}:'.format(self.domuuid))
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self.dom = None
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self.inshutdown = False
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# Stop the log watcher
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self.console_log_instance.stop()
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def live_migrate_vm(self, dest_node):
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try:
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dest_lv_conn = libvirt.open('qemu+tcp://{}/system'.format(self.node))
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if dest_lv_conn == None:
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raise
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except:
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self.logger.out('Failed to open connection to qemu+tcp://{}/system; aborting migration.'.format(self.node), state='e', prefix='Domain {}:'.format(self.domuuid))
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return False
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try:
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target_dom = self.dom.migrate(dest_lv_conn, libvirt.VIR_MIGRATE_LIVE, None, None, 0)
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if target_dom == None:
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raise
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self.logger.out('Successfully migrated VM', state='o', prefix='Domain {}:'.format(self.domuuid))
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except:
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dest_lv_conn.close()
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return False
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dest_lv_conn.close()
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return True
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# Migrate the VM to a target host
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def migrate_vm(self):
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self.inmigrate = True
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self.logger.out('Migrating VM to node "{}"'.format(self.node), state='i', prefix='Domain {}:'.format(self.domuuid))
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migrate_ret = self.live_migrate_vm(self.node)
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if not migrate_ret:
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self.logger.out('Could not live migrate VM; shutting down to migrate instead', state='e', prefix='Domain {}:'.format(self.domuuid))
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self.shutdown_vm()
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else:
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self.removeDomainFromList()
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zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'start' })
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self.inmigrate = False
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# Stop the log watcher
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self.console_log_instance.stop()
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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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# Start the log watcher
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self.console_log_instance.start()
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self.inreceive = True
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self.logger.out('Receiving migration', state='i', prefix='Domain {}:'.format(self.domuuid))
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while True:
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time.sleep(1)
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self.state = zkhandler.readdata(self.zk_conn, '/domains/{}/state'.format(self.domuuid))
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self.dom = self.lookupByUUID(self.domuuid)
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if self.dom == None and self.state == 'migrate':
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continue
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if self.state != 'migrate':
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break
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try:
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if self.dom.state()[0] == libvirt.VIR_DOMAIN_RUNNING:
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break
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except:
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continue
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try:
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dom_state = self.dom.state()[0]
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except AttributeError:
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dom_state = None
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if dom_state == libvirt.VIR_DOMAIN_RUNNING:
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self.addDomainToList()
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self.logger.out('Successfully received migrated VM', state='o', prefix='Domain {}:'.format(self.domuuid))
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else:
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self.logger.out('Failed to receive migrated VM', state='e', prefix='Domain {}:'.format(self.domuuid))
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self.inreceive = False
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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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# Update the current values from zookeeper
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self.state = zkhandler.readdata(self.zk_conn, '/domains/{}/state'.format(self.domuuid))
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self.node = zkhandler.readdata(self.zk_conn, '/domains/{}/node'.format(self.domuuid))
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# Check the current state of the VM
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try:
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if self.dom != None:
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running, reason = self.dom.state()
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else:
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raise
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except:
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running = libvirt.VIR_DOMAIN_NOSTATE
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self.logger.out('VM state change for "{}": {} {}'.format(self.domuuid, self.state, self.node), state='i')
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#######################
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# Handle state changes
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#######################
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# Valid states are:
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# start
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# migrate
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# restart
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# shutdown
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# stop
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# Conditional pass one - Are we already performing an action
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if self.instart == False \
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and self.inrestart == False \
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and self.inmigrate == False \
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and self.inreceive == False \
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and self.inshutdown == False \
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and self.instop == False:
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# Conditional pass two - Is this VM configured to run on this node
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if self.node == self.this_node.name:
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# Conditional pass three - Is this VM currently running on this node
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if running == libvirt.VIR_DOMAIN_RUNNING:
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# VM is already running and should be
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if self.state == "start":
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# Start the log watcher
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self.console_log_instance.start()
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# Add domain to running list
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self.addDomainToList()
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# VM is already running and should be but stuck in migrate state
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elif self.state == "migrate":
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# Start the log watcher
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self.console_log_instance.start()
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zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'start' })
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# Add domain to running list
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self.addDomainToList()
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# VM should be restarted
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elif self.state == "restart":
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self.restart_vm()
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# VM should be shut down
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elif self.state == "shutdown":
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self.shutdown_vm()
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# VM should be stopped
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elif self.state == "stop":
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self.stop_vm()
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else:
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# VM should be started
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if self.state == "start":
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# Start the domain
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self.start_vm()
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# VM should be migrated to this node
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elif self.state == "migrate":
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# Receive the migration
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self.receive_migrate()
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# VM should be restarted (i.e. started since it isn't running)
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if self.state == "restart":
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zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'start' })
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# VM should be shut down; ensure it's gone from this node's domain_list
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elif self.state == "shutdown":
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self.removeDomainFromList()
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# Stop the log watcher
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self.console_log_instance.stop()
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# VM should be stoped; ensure it's gone from this node's domain_list
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elif self.state == "stop":
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self.removeDomainFromList()
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# Stop the log watcher
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self.console_log_instance.stop()
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else:
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# Conditional pass three - Is this VM currently running on this node
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if running == libvirt.VIR_DOMAIN_RUNNING:
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# VM should be migrated away from this node
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if self.state == "migrate":
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self.migrate_vm()
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# VM should be terminated
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else:
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self.terminate_vm()
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# This function is a wrapper for libvirt.lookupByUUID which fixes some problems
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# 1. Takes a text UUID and handles converting it to bytes
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# 2. Try's it and returns a sensible value if not
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def lookupByUUID(self, tuuid):
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# Don't do anything if the VM shouldn't live on this node
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if self.node != self.this_node.name:
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return None
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lv_conn = None
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libvirt_name = "qemu:///system"
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# Convert the text UUID to bytes
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buuid = uuid.UUID(tuuid).bytes
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# Try
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try:
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# Open a libvirt connection
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lv_conn = libvirt.open(libvirt_name)
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if lv_conn == None:
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self.logger.out('Failed to open local libvirt connection', state='e', prefix='Domain {}:'.format(self.domuuid))
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return None
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# Lookup the UUID
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dom = lv_conn.lookupByUUID(buuid)
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# Fail
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except:
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dom = None
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# After everything
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finally:
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# Close the libvirt connection
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if lv_conn != None:
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lv_conn.close()
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# Return the dom object (or None)
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return dom
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