"""LibVirt slivers"""
-import account
-import logger
-import subprocess
-import os
-import os.path
-import libvirt
import sys
-import shutil
-import bwlimit
-import cgroups
+import os, os.path
+import re
+import subprocess
import pprint
+import random
+
+import libvirt
-from string import Template
+from account import Account
+import logger
+import plnode.bwlimit as bwlimit
+import cgroups
STATES = {
libvirt.VIR_DOMAIN_NOSTATE: 'no state',
libvirt.VIR_DOMAIN_CRASHED: 'crashed',
}
-connections = dict()
+REASONS = {
+ libvirt.VIR_CONNECT_CLOSE_REASON_ERROR: 'Misc I/O error',
+ libvirt.VIR_CONNECT_CLOSE_REASON_EOF: 'End-of-file from server',
+ libvirt.VIR_CONNECT_CLOSE_REASON_KEEPALIVE: 'Keepalive timer triggered',
+ libvirt.VIR_CONNECT_CLOSE_REASON_CLIENT: 'Client requested it',
+}
-# Helper methods
+connections = dict()
-def getConnection(sliver_type):
- # TODO: error checking
- # vtype is of the form sliver.[LXC/QEMU] we need to lower case to lxc/qemu
- vtype = sliver_type.split('.')[1].lower()
- uri = vtype + '://'
- return connections.setdefault(uri, libvirt.open(uri))
+# Common Libvirt code
-def debuginfo(dom):
- ''' Helper method to get a "nice" output of the info struct for debug'''
- [state, maxmem, mem, ncpu, cputime] = dom.info()
- return '%s is %s, maxmem = %s, mem = %s, ncpu = %s, cputime = %s' % (dom.name(), STATES.get(state, state), maxmem, mem, ncpu, cputime)
+class Sliver_Libvirt(Account):
-# Common Libvirt code
+ # Helper methods
-class Sliver_Libvirt(account.Account):
+ @staticmethod
+ def getConnection(sliver_type):
+ # TODO: error checking
+ # vtype is of the form sliver.[LXC/QEMU] we need to lower case to lxc/qemu
+ vtype = sliver_type.split('.')[1].lower()
+ uri = vtype + '://'
+ return connections.setdefault(uri, libvirt.open(uri))
def __init__(self, rec):
self.name = rec['name']
self.rspec = {}
self.slice_id = rec['slice_id']
self.enabled = True
- self.conn = getConnection(rec['type'])
+ 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 %s does not exist. ' \
+ 'Will try to create it again.' % (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=%s - OSType=%s"%(dom.ID(),dom.OSType())
+ # calling state() seems to be working fine
+ (state,reason)=dom.state()
+ output += " state=%s, reason=%s"%(STATES.get(state,state),REASONS.get(reason,reason))
try:
- self.dom = self.conn.lookupByName(self.name)
+ # 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: maxmem = %s, mem = %s, ncpu = %s, cputime = %s]" % (STATES.get(state, state), maxmem, mem, ncpu, cputime)
except:
- logger.log('sliver_libvirt: Domain %s does not exist ' \
- 'UNEXPECTED: %s'%(self.name, sys.exc_info()[1]))
+ # 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 %s"%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"
+ xml = open("/etc/libvirt/lxc/%s.xml" % self.name).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", "/etc/libvirt/lxc/%s.xml" % self.name]
+ logger.log_call(command)
def start(self, delay=0):
''' Just start the sliver '''
# Check if it's running to avoid throwing an exception if the
# domain was already running, create actually means start
if not self.is_running():
- self.dom.create()
+ try:
+ self.dom.create()
+ except Exception, 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 %s" % self.name)
+ self.repair_veth()
+ logger.log("trying dom.create again")
+ self.dom.create()
+ else:
+ raise
else:
logger.verbose('sliver_libvirt: sliver %s already started'%(self.name))
try:
self.dom.destroy()
except:
- logger.verbose('sliver_libvirt: Domain %s not running ' \
- 'UNEXPECTED: %s'%(self.name, sys.exc_info()[1]))
- print 'sliver_libvirt: Domain %s not running ' \
- 'UNEXPECTED: %s'%(self.name, sys.exc_info()[1])
+ logger.log_exc("in sliver_libvirt.stop",name=self.name)
def is_running(self):
''' Return True if the domain is running '''
- logger.verbose('sliver_libvirt: %s is_running'%self.name)
- try:
- [state, _, _, _, _] = self.dom.info()
- if state == libvirt.VIR_DOMAIN_RUNNING:
- logger.verbose('sliver_libvirt: %s is RUNNING'%self.name)
- return True
- else:
- info = debuginfo(self.dom)
- logger.verbose('sliver_libvirt: %s is ' \
- 'NOT RUNNING...\n%s'%(self.name, info))
- return False
- except:
- logger.verbose('sliver_libvirt: UNEXPECTED ERROR in ' \
- '%s: %s'%(self.name, sys.exc_info()[1]))
- print 'sliver_libvirt: UNEXPECTED ERROR in ' \
- '%s: %s'%(self.name, sys.exc_info()[1])
- return False
+ (state,_) = self.dom.state()
+ result = (state == libvirt.VIR_DOMAIN_RUNNING)
+ logger.verbose('sliver_libvirt.is_running: %s => %s'%(self,result))
+ return result
def configure(self, rec):
# Btrfs support quota per volumes
- # It will depend on the FS selection
- if rec.has_key('disk_max'):
- disk_max = rec['disk_max']
- if disk_max == 0:
- # unlimited
- pass
+ if rec.has_key("rspec") and rec["rspec"].has_key("tags"):
+ 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 %s as cgroups are not yet populated" % self.name)
else:
- # limit to certain number
- pass
-
- # Memory allocation
- if rec.has_key('memlock_hard'):
- mem = rec['memlock_hard'] * 1024 # hard limit in bytes
- cgroups.write(self.name, 'memory.limit_in_bytes', mem)
- if rec.has_key('memlock_soft'):
- mem = rec['memlock_soft'] * 1024 # soft limit in bytes
- cgroups.write(self.name, 'memory.soft_limit_in_bytes', mem)
-
- # CPU allocation
- # Only cpu_shares until figure out how to provide limits and guarantees
- # (RT_SCHED?)
- if rec.has_key('cpu_share'):
- cpu_share = rec['cpu_share']
- cgroups.write(self.name, 'cpu.shares', cpu_share)
+ tags = rec["rspec"]["tags"]
+ # It will depend on the FS selection
+ if tags.has_key('disk_max'):
+ disk_max = tags['disk_max']
+ if disk_max == 0:
+ # unlimited
+ pass
+ else:
+ # limit to certain number
+ pass
+
+ # Memory allocation
+ if tags.has_key('memlock_hard'):
+ mem = str(int(tags['memlock_hard']) * 1024) # hard limit in bytes
+ cgroups.write(self.name, 'memory.limit_in_bytes', mem, subsystem="memory")
+ if tags.has_key('memlock_soft'):
+ 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 tags.has_key('cpu_share'):
+ cpu_share = tags['cpu_share']
+ cgroups.write(self.name, 'cpu.shares', cpu_share)
# Call the upper configure method (ssh keys...)
- account.Account.configure(self, rec)
+ Account.configure(self, rec)
+
+ @staticmethod
+ def get_unique_vif():
+ return 'veth%s' % 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='%s'/>
+ </interface>
+""" % (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='%s'/></vlan>" % interface['vlan']
+ else:
+ vlanxml = ""
+ if 'bridge' in interface:
+ tag_xml = tag_xml + """
+ <interface type='bridge'>
+ <source bridge='%s'/>
+ %s
+ <virtualport type='openvswitch'/>
+ <target dev='%s'/>
+ </interface>
+ """ % (interface['bridge'], vlanxml, Sliver_Libvirt.get_unique_vif())
+ else:
+ tag_xml = tag_xml + """
+ <interface type='network'>
+ <source network='default'/>
+ <target dev='%s'/>
+ </interface>
+ """ % (Sliver_Libvirt.get_unique_vif())
+
+ xml = tag_xml
+ logger.log('sliver_libvirty.py: interface XML is: %s' % xml)
+
+ except:
+ logger.log('sliver_libvirt.py: ERROR parsing "interface" tag for slice %s' % rec['name'])
+ logger.log('sliver_libvirt.py: tag value: %s' % tags['interface'])
+ return xml
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