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sliver_libvirt.py
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sliver_libvirt.py
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"""LibVirt slivers"""
import sys
import os, os.path
import re
import subprocess
import pprint
import random
import libvirt
from account import Account
import logger
import plnode.bwlimit as bwlimit
import cgroups
STATES = {
libvirt.VIR_DOMAIN_NOSTATE: 'no state',
libvirt.VIR_DOMAIN_RUNNING: 'running',
libvirt.VIR_DOMAIN_BLOCKED: 'blocked on resource',
libvirt.VIR_DOMAIN_PAUSED: 'paused by user',
libvirt.VIR_DOMAIN_SHUTDOWN: 'being shut down',
libvirt.VIR_DOMAIN_SHUTOFF: 'shut off',
libvirt.VIR_DOMAIN_CRASHED: 'crashed',
}
# with fedora24 and (broken) libvirt-python-1.3.3-3,
# the following symbols are not available
# kashyap on IRC reported that libvirt-python-1.3.5-1.fc24.x86_64
# did not have the issue though
try:
REASONS = {
# 0
libvirt.VIR_CONNECT_CLOSE_REASON_ERROR: 'Misc I/O error',
# 1
libvirt.VIR_CONNECT_CLOSE_REASON_EOF: 'End-of-file from server',
# 2
libvirt.VIR_CONNECT_CLOSE_REASON_KEEPALIVE: 'Keepalive timer triggered',
# 3
libvirt.VIR_CONNECT_CLOSE_REASON_CLIENT: 'Client requested it',
}
except:
REASONS = {
# libvirt.VIR_CONNECT_CLOSE_REASON_ERROR
0 : 'Misc I/O error',
# libvirt.VIR_CONNECT_CLOSE_REASON_EOF
1 : 'End-of-file from server',
# libvirt.VIR_CONNECT_CLOSE_REASON_KEEPALIVE
2 : 'Keepalive timer triggered',
# libvirt.VIR_CONNECT_CLOSE_REASON_CLIENT
3 : 'Client requested it',
}
logger.log("WARNING : using hard-wired constants instead of symbolic names for CONNECT_CLOSE*")
connections = dict()
# Common Libvirt code
class Sliver_Libvirt(Account):
# Helper methods
@staticmethod
def getConnection(sliver_type):
"""
returns a connection to the underlying libvirt service
a single connection is created and shared among slivers
this call ensures the connection is alive
and will reconnect if it appears to be necessary
"""
# sliver_type comes from rec['type'] and is of the form sliver.{LXC,QEMU}
# so we need to lower case to lxc/qemu
vtype = sliver_type.split('.')[1].lower()
uri = vtype + ':///'
if uri not in connections:
# create connection
conn = libvirt.open(uri)
connections[uri] = conn
return conn
else:
# connection already available : check for health
conn = connections[uri]
# see if a reconnection is needed
try:
numDomains = conn.numOfDomains()
except:
logger.log("libvirt connection to {} looks broken - reconnecting".format(uri))
conn = libvirt.open(uri)
# if this fails then an expection is thrown outside of this function
numDomains = conn.numOfDomains()
return conn
def __init__(self, rec):
self.name = rec['name']
logger.verbose ('sliver_libvirt: {} init'.format(self.name))
# Assume the directory with the image and config files
# are in place
self.keys = ''
self.rspec = {}
self.slice_id = rec['slice_id']
self.enabled = True
self.conn = Sliver_Libvirt.getConnection(rec['type'])
self.xid = bwlimit.get_xid(self.name)
dom = None
try:
dom = self.conn.lookupByName(self.name)
except:
logger.log('sliver_libvirt: Domain {} does not exist. ' \
'Will try to create it again.'.format(self.name))
self.__class__.create(rec['name'], rec)
dom = self.conn.lookupByName(self.name)
self.dom = dom
@staticmethod
def dom_details (dom):
output = ""
output += " id={} - OSType={}".format(dom.ID(), dom.OSType())
# calling state() seems to be working fine
(state, reason) = dom.state()
output += " state={}, reason={}".format(STATES.get(state, state),
REASONS.get(reason, reason))
try:
# try to use info() - this however does not work for some reason on f20
# info cannot get info operation failed: Cannot read cputime for domain
[state, maxmem, mem, ncpu, cputime] = dom.info()
output += " [info: state={}, maxmem = {}, mem = {}, ncpu = {}, cputime = {}]"\
.format(STATES.get(state, state), maxmem, mem, ncpu, cputime)
except:
# too bad but libvirt.py prints out stuff on stdout when this fails, don't know how to get rid of that..
output += " [info: not available]"
return output
def __repr__(self):
''' Helper method to get a "nice" output of the domain struct for debug purposes'''
output = "Domain {}".format(self.name)
dom = self.dom
if dom is None:
output += " [no attached dom ?!?]"
else:
output += Sliver_Libvirt.dom_details (dom)
return output
# Thierry : I am not quite sure if /etc/libvirt/lxc/<>.xml holds a reliably up-to-date
# copy of the sliver XML config; I feel like issuing a virsh dumpxml first might be safer
def repair_veth(self):
# See workaround email, 2-14-2014, "libvirt 1.2.1 rollout"
xmlfilename = "/etc/libvirt/lxc/{}.xml".format(self.name)
with open(xmlfilename) as xmlfile:
xml = xmlfile.read()
veths = re.findall("<target dev='veth[0-9]*'/>", xml)
veths = [x[13:-3] for x in veths]
for veth in veths:
command = ["ip", "link", "delete", veth]
logger.log_call(command)
logger.log("trying to redefine the VM")
command = [ "virsh", "define", xmlfilename ]
logger.log_call(command)
def start(self, delay=0):
'''Just start the sliver'''
logger.verbose('sliver_libvirt: {} start'.format(self.name))
# TD: Added OpenFlow rules to avoid OpenVSwitch-based slivers'
# auto-configuration issues when IPv6 auto-config and/or DHCP are
# available in the node's network. Sliver configuration is static.
if os.path.exists('/usr/bin/ovs-ofctl'):
logger.log('Adding OpenFlow rules to prevent IPv6 auto-config and DHCP in OpenVSwitch slivers')
# IPv6 ICMP Router Solicitation and Advertisement
logger.log_call([ '/usr/bin/ovs-ofctl', 'add-flow', 'public0', 'priority=100,icmp6,icmp_type=133,idle_timeout=0,hard_timeout=0,actions=drop' ])
logger.log_call([ '/usr/bin/ovs-ofctl', 'add-flow', 'public0', 'priority=100,icmp6,icmp_type=134,idle_timeout=0,hard_timeout=0,actions=drop' ])
# IPv4 DHCP
logger.log_call([ '/usr/bin/ovs-ofctl', 'add-flow', 'public0', 'priority=101,udp,nw_src=0.0.0.0,nw_dst=255.255.255.255,tp_src=68,tp_dst=67,idle_timeout=0,hard_timeout=0,actions=drop' ])
logger.log_call([ '/usr/bin/ovs-ofctl', 'add-flow', 'public0', 'priority=101,udp,tp_src=67,tp_dst=68,idle_timeout=0,hard_timeout=0,actions=drop' ])
else:
logger.log('NOTE: /usr/bin/ovs-ofctl not found!')
# Check if it's running to avoid throwing an exception if the
# domain was already running
if not self.is_running():
try:
# create actually means start
self.dom.create()
except Exception as e:
# XXX smbaker: attempt to resolve slivers that are stuck in
# "failed to allocate free veth".
if "ailed to allocate free veth" in str(e):
logger.log("failed to allocate free veth on {}".format(self.name))
self.repair_veth()
logger.log("trying dom.create again")
self.dom.create()
else:
raise
else:
logger.verbose('sliver_libvirt: sliver {} already started'.format(self.name))
# After the VM is started... we can play with the virtual interface
# Create the ebtables rule to mark the packets going out from the virtual
# interface to the actual device so the filter canmatch against the mark
bwlimit.ebtables("-A INPUT -i veth{} -j mark --set-mark {}"
.format(self.xid, self.xid))
# TD: Turn off SCTP checksum offloading. It is currently not working. FIXME: check for a kernel fix!
result = logger.log_call(['/usr/sbin/lxcsu', '-r', self.name, '--', '/usr/sbin/ethtool', '-K', 'eth0', 'tx-checksum-sctp', 'off'])
if not result:
logger.log('unable to apply SCTP checksum bug work-around for %s' % self.name)
# TD: Work-around for missing interface configuration: ensure that networking service is running.
result = logger.log_call(['/usr/sbin/lxcsu', '-r', self.name, '/sbin/service', 'network', 'restart'])
if not result:
logger.log('unable to restart networking service for %s' % self.name)
### this is confusing, because it seems it is not used in fact
def stop(self):
logger.verbose('sliver_libvirt: {} stop'.format(self.name))
# Remove the ebtables rule before stopping
bwlimit.ebtables("-D INPUT -i veth{} -j mark --set-mark {}"
.format(self.xid, self.xid))
try:
self.dom.destroy()
except:
logger.log_exc("in sliver_libvirt.stop", name=self.name)
def is_running(self):
''' Return True if the domain is running '''
(state, _) = self.dom.state()
result = (state == libvirt.VIR_DOMAIN_RUNNING)
logger.verbose('sliver_libvirt.is_running: {} => {}'
.format(self, result))
return result
def configure(self, rec):
#sliver.[LXC/QEMU] tolower case
#sliver_type = rec['type'].split('.')[1].lower()
#BASE_DIR = '/cgroup/libvirt/{}/{}/'.format(sliver_type, self.name)
# Disk allocation
# No way through cgroups... figure out how to do that with user/dir quotas.
# There is no way to do quota per directory. Chown-ing would create
# problems as username namespaces are not yet implemented (and thus, host
# and containers share the same name ids
# Btrfs support quota per volumes
if "rspec" in rec and "tags" in rec["rspec"]:
if cgroups.get_cgroup_path(self.name) == None:
# If configure is called before start, then the cgroups won't exist
# yet. NM will eventually re-run configure on the next iteration.
# TODO: Add a post-start configure, and move this stuff there
logger.log("Configure: postponing tag check on {} as cgroups are not yet populated"
.format(self.name))
else:
tags = rec["rspec"]["tags"]
# It will depend on the FS selection
if 'disk_max' in tags:
disk_max = tags['disk_max']
if disk_max == 0:
# unlimited
pass
else:
# limit to certain number
pass
# Memory allocation
if 'memlock_hard' in tags:
mem = str(int(tags['memlock_hard']) * 1024) # hard limit in bytes
cgroups.write(self.name, 'memory.limit_in_bytes', mem, subsystem="memory")
if 'memlock_soft' in tags:
mem = str(int(tags['memlock_soft']) * 1024) # soft limit in bytes
cgroups.write(self.name, 'memory.soft_limit_in_bytes', mem, subsystem="memory")
# CPU allocation
# Only cpu_shares until figure out how to provide limits and guarantees
# (RT_SCHED?)
if 'cpu_share' in tags:
cpu_share = tags['cpu_share']
cgroups.write(self.name, 'cpu.shares', cpu_share)
# Call the upper configure method (ssh keys...)
Account.configure(self, rec)
@staticmethod
def get_unique_vif():
return 'veth{}'.format(random.getrandbits(32))
# A placeholder until we get true VirtualInterface objects
@staticmethod
def get_interfaces_xml(rec):
xml = """
<interface type='network'>
<source network='default'/>
<target dev='{}'/>
</interface>
""".format(Sliver_Libvirt.get_unique_vif())
try:
tags = rec['rspec']['tags']
if 'interface' in tags:
interfaces = eval(tags['interface'])
if not isinstance(interfaces, (list, tuple)):
# if interface is not a list, then make it into a singleton list
interfaces = [interfaces]
tag_xml = ""
for interface in interfaces:
if 'vlan' in interface:
vlanxml = "<vlan><tag id='{}'/></vlan>".format(interface['vlan'])
else:
vlanxml = ""
if 'bridge' in interface:
tag_xml = tag_xml + """
<interface type='bridge'>
<source bridge='{}'/>
{}
<virtualport type='openvswitch'/>
<target dev='{}'/>
</interface>
""".format(interface['bridge'], vlanxml, Sliver_Libvirt.get_unique_vif())
else:
tag_xml = tag_xml + """
<interface type='network'>
<source network='default'/>
<target dev='{}'/>
</interface>
""".format(Sliver_Libvirt.get_unique_vif())
xml = tag_xml
logger.log('sliver_libvirty.py: interface XML is: {}'.format(xml))
except:
logger.log('sliver_libvirt.py: ERROR parsing "interface" tag for slice {}'.format(rec['name']))
logger.log('sliver_libvirt.py: tag value: {}'.format(tags['interface']))
return xml