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vm.py
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vm.py
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# Copyright (C) 2011-2012 Kostiantyn Danylov aka koder <koder.mail@gmail.com>
#
# This file is part of tiny_cloud library.
#
# tiny_cloud is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; either version 2.1 of the License, or (at your option)
# any later version.
#
# tiny_cloud is distrubuted 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 Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with tiny_cloud; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
import re
import time
import stat
import os.path
import subprocess
from xml.etree.ElementTree import fromstring, tostring, Element
import libvirt
import xmlbuilder
from network import login_ssh, get_vm_ips, get_vm_ssh_ip, ifconfig, get_network_bridge
from utils import ip2int, int2ip, netsz2netmask, netmask2netsz, logger
from common import CloudError
from disk_image import prepare_guest
#suppress libvirt error messages to console
libvirt.registerErrorHandler(lambda x, y: 1, None)
class VM(object):
eth_re = re.compile(r"eth\d+")
class NetParams(object):
mac_re = re.compile(':'.join([r"[\da-fA-F][\da-fA-F]"] * 6))
ip_re = re.compile(r"\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}")
network_re = re.compile(r"[a-zA-Z_][-\w_]*")
def __init__(self, name, **keys):
self.name = name
self.mem = int(keys.pop('mem', 1024))
self.htype = keys.pop('htype', 'kvm')
self.vcpu = int(keys.pop('vcpu', 1))
credentials = keys.pop('credentials', 'root:root')
self.user, self.passwd = credentials.split(':')
if 'image' in keys:
self.images = [keys.pop('image')]
else:
self.images = keys.pop('images')
self.opts = [i.strip() for i in keys.pop('opts', "").split()]
self.__dict__.update(keys)
def eths(self):
for k, v in self.__dict__.items():
if self.eth_re.match(k):
params = v.split(',')
res = {'name': k,
'network': 'default'}
for param in params:
param = param.strip()
ok = False
for k, v in self.NetParams.__dict__.items():
if k.endswith('_re'):
if v.match(param):
res[k[:-len('_re')]] = param
ok = True
break
if not ok:
raise ValueError("Can't categorize network parameter {0!r}".format(param))
yield res
def __str__(self):
return "VM({0!r})".format(self.name)
def __repr__(self):
return str(self)
class Network(object):
def __init__(self, name, **data):
ip_range = data['range']
self.ip1, ip2_sz = ip_range.split('-')
self.ip2, self.sz = ip2_sz.split('/')
self.ip1 = self.ip1.strip()
self.ip2 = self.ip2.strip()
self.sz = int(self.sz)
self.url = data.get('url', 'qemu:///system')
self.name = name
self.ip = int2ip(ip2int(self.ip1) + 1)
self.bridge = data['bridge'].strip()
self.netmask = netsz2netmask(self.sz)
class TinyCloud(object):
def_connection = 'qemu:///system'
def __init__(self, vms, templates, networks,
urls, root, **defaults):
self.urls = urls
self.vms = {}
self.templates = templates
self.add_vms(vms)
self.root = root
self.networks = [Network(name, **data)
for name, data in networks.items()]
msg = "Cloud with {0} vm templates created".format(self.vms.keys())
logger.debug(msg)
self.defaults = defaults
DOM_SEPARATOR = '.'
def add_vm(self, name, **params):
self.vms[name] = VM(name, **params)
def add_vms(self, vms, prefix=""):
for k, v in vms.items():
if not isinstance(v, dict):
continue
if v.get('type', 'vm') == 'network':
self.add_vms(v, prefix=prefix + k + self.DOM_SEPARATOR)
else:
self.vms[prefix + k] = VM(prefix + k, **v)
def __iter__(self):
return iter(self.vms)
def get_vm_conn(self, vmname):
return libvirt.open(self.urls[self.vms[vmname].htype])
def get_vm_ssh_ip(self, vmname):
return get_vm_ssh_ip(self.get_vm_conn(vmname), vmname)
def get_vm_ips(self, vmname):
return get_vm_ips(self.get_vm_conn(vmname), vmname)
def start_net(self, name):
logger.info("Start network " + name)
if name in self.networks:
conn = libvirt.open(self.urls[self.networks[name].htype])
else:
conn = libvirt.open(self.def_connection)
try:
net = conn.networkLookupByName(name)
if not net.isActive():
logger.debug("Network registered in libvirt - start it")
net.create()
else:
logger.debug("Network already active")
except libvirt.libvirtError:
try:
logger.debug("No such network in libvirt")
net = self.networks[name]
except KeyError:
msg = "Can't found network {0!r}".format(name)
logger.error(msg)
raise CloudError(msg)
xml = xmlbuilder.XMLBuilder('network')
xml.name(name)
xml.bridge(name=net.bridge)
with xml.ip(address=net.ip, netmask=net.netmask):
xml.dhcp.range(start=net.ip1, end=net.ip2)
logger.debug("Create network")
conn.networkCreateXML(str(xml))
def start_vm(self, vmname, users, prepare_image=False):
logger.info("Start vm/network {0} with credentials {1}".format(vmname, users))
vms = [vm for vm in self.vms.values()
if vm.name == vmname or
vm.name.startswith(vmname +
self.DOM_SEPARATOR)]
vm_names = " ".join(vm.name for vm in vms)
logger.debug("Found next vm's, which match name glob {0}".format(vm_names))
for vm in vms:
logger.debug("Prepare vm {0}".format(vm.name))
path = os.path.join(self.root, self.templates[vm.htype])
vm_xml_templ = open(path).read()
logger.info("Use template '{0}'".format(path))
vm_xm = fromstring(vm_xml_templ)
el = Element('vcpu')
el.text = str(vm.vcpu)
vm_xm.append(el)
el = Element('name')
el.text = vm.name
vm_xm.append(el)
el = Element('memory')
el.text = str(vm.mem * 1024)
vm_xm.append(el)
devs = vm_xm.find('devices')
disk_emulator = self.defaults.get('disk_emulator', 'qemu')
if 'virtio' in vm.opts:
bus = 'virtio'
else:
bus = 'ide'
if 'ide' == bus:
dev_name_templ = 'hd'
elif 'scsi' == bus:
dev_name_templ = 'sd'
elif 'virtio' == bus:
dev_name_templ = 'vd'
letters = [chr(ord('a') + pos) for pos in range(ord('z') - ord('a'))]
for hdd_pos, image in enumerate(vm.images):
if hdd_pos > len(letters):
raise CloudError("To many HHD devices {0}".format(len(vm.images)))
rimage = image
dev_st = os.stat(rimage)
while stat.S_ISLNK(dev_st.st_mode):
rimage = os.readlink(rimage)
dev_st = os.stat(rimage)
dev = dev_name_templ + letters[hdd_pos]
if stat.S_ISDIR(dev_st.st_mode):
hdd = xmlbuilder.XMLBuilder('filesystem', type='mount')
hdd.source(dir=image)
hdd.target(dir='/')
else:
res = subprocess.check_output(['qemu-img', 'info', image])
hdr = "file format: "
tp = None
for line in res.split('\n'):
if line.startswith(hdr):
tp = line[len(hdr):].strip()
assert tp is not None
if stat.S_ISBLK(dev_st.st_mode):
hdd = xmlbuilder.XMLBuilder('disk', device='disk', type='block')
hdd.driver(name=disk_emulator, type=tp)
hdd.source(dev=image)
hdd.target(bus=bus, dev=dev)
elif stat.S_ISREG(dev_st.st_mode):
hdd = xmlbuilder.XMLBuilder('disk', device='disk', type='file')
hdd.driver(name=disk_emulator, type=tp)
hdd.source(file=image)
hdd.target(bus=bus, dev=dev)
else:
raise CloudError("Can't connect hdd device {0!r}".format(image))
devs.append(~hdd)
eths = {}
conn = self.get_vm_conn(vm.name)
for eth in vm.eths():
edev = xmlbuilder.XMLBuilder('interface', type='network')
edev.source(network=eth['network'])
edev.mac(address=eth['mac'])
devs.append(~edev)
if 'ip' not in eth:
eths[eth['name']] = (eth['mac'], 'dhcp', None, None)
else:
brdev = get_network_bridge(conn, eth['network'])
addr = ifconfig.getAddr(brdev)
mask = ifconfig.getMask(brdev)
eths[eth['name']] = (eth['mac'], eth['ip'], netmask2netsz(mask), addr)
if users is None:
users = {vm.user: vm.passwd}
try:
if vm.htype == 'lxc':
prepare_guest(vm.images[0], vm.name, users, eths, format='lxc')
elif prepare_image:
prepare_guest(vm.images[0], vm.name, users, eths)
except CloudError as x:
print "Can't update vm image -", x
logger.debug("Image ready - start vm {0}".format(vm.name))
conn.createXML(tostring(vm_xm), 0)
logger.debug("VM {0} started ok".format(vm.name))
conn.close()
def stop_vm(self, vmname, timeout1=10, timeout2=2):
logger.info("Stop vm/network {0}".format(vmname))
vms = [vm for vm in self.vms.values()
if vm.name == vmname or
vm.name.startswith(vmname + self.DOM_SEPARATOR)]
vm_names = " ".join(vm.name for vm in vms)
logger.debug("Found next vm's, which match name glob {0}".format(vm_names))
for xvm in vms:
conn = self.get_vm_conn(xvm.name)
logger.debug("Stop vm {0}".format(xvm.name))
try:
vm = conn.lookupByName(xvm.name)
except libvirt.libvirtError:
logger.debug("vm {0} don't exists - skip it".format(xvm.name))
else:
logger.debug("Shutdown vm {0}".format(xvm.name))
try:
vm.shutdown()
except libvirt.libvirtError:
pass
else:
for i in range(timeout1):
time.sleep(1)
try:
vm = conn.lookupByName(xvm.name)
except libvirt.libvirtError:
return
logger.warning("VM {0} don't shoutdowned - destroy it".format(xvm.name))
vm.destroy()
for i in range(timeout2):
time.sleep(1)
try:
vm = conn.lookupByName(xvm.name)
except libvirt.libvirtError:
return
logger.error("Can't stop vm {0}".format(xvm.name))
raise CloudError("Can't stop vm {0}".format(xvm.name))
conn.close()
def list_vms(self):
for url in self.urls.values():
conn = libvirt.open(url)
for domain_id in conn.listDomainsID():
yield conn.lookupByID(domain_id)
conn.close()
def login_to_vm(self, vmname, users=None):
vm = self.vms[vmname]
ipaddr = get_vm_ssh_ip(self.get_vm_conn(vmname), vmname)
if ipaddr is None:
raise CloudError("No one interface of {0} accepts ssh connection".format(vmname))
else:
if users is not None:
login_ssh(ipaddr, users.keys()[0], users.values()[0])
else:
login_ssh(ipaddr, vm.user, vm.passwd)