X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=sliver_libvirt.py;h=cad14cba8774fbc0028cdd7f872d42b2fdceb973;hb=23735d93362da4ab1cd84f40d9c6e7fdb005f4ff;hp=ba6067767c4570c44516ce6e2b8da682483c6050;hpb=ffd0695eb1c979e4dcee9eae29dd3578801971f3;p=nodemanager.git
diff --git a/sliver_libvirt.py b/sliver_libvirt.py
index ba60677..cad14cb 100644
--- a/sliver_libvirt.py
+++ b/sliver_libvirt.py
@@ -1,178 +1,225 @@
-#
-
"""LibVirt slivers"""
-import accounts
-import logger
-import subprocess
-import os
-import libvirt
import sys
+import os, os.path
+import subprocess
+import pprint
+import random
-from string import Template
+import libvirt
-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',
+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',
+ libvirt.VIR_DOMAIN_SHUTOFF: 'shut off',
+ libvirt.VIR_DOMAIN_CRASHED: 'crashed',
}
-def randomMAC():
- mac = [ random.randint(0x00, 0xff),
- random.randint(0x00, 0xff),
- random.randint(0x00, 0xff),
- random.randint(0x00, 0xff),
- random.randint(0x00, 0xff),
- random.randint(0x00, 0xff) ]
- return ':'.join(map(lambda x: "%02x" % x, mac))
-
-class Sliver_LV(accounts.Account):
- """This class wraps LibVirt commands"""
-
- SHELL = '/bin/sh'
-
- # Need to add a tag at myplc to actually use this account
- # type = 'sliver.LIBVIRT'
- TYPE = 'sliver.LIBVIRT'
-
+connections = dict()
- @staticmethod
- def create(name, rec = None):
- ''' Create dirs, copy fs image, lxc_create '''
- print "LIBVIRT %s create"%(name)
- logger.verbose ('sliver_libvirt: %s create'%(name))
- dir = '/vservers/%s'%(name)
-
- # Template for sliver configuration
- template = Template(open('/vservers/config_template.xml').read())
- config = template.substitute(name=name)
-
- lxc_log = '%s/log'%(dir)
-
- # TODO: copy the sliver FS to the correct path if sliver does not
- # exist. Update MAC addresses and insert an entry on the libvirt DHCP
- # server to get an actual known IP. Some sort of pool?
- if not (os.path.isdir(dir) and
- os.access(dir, os.R_OK | os.W_OK | os.X_OK)):
- logger.verbose('lxc_create: directory %s does not exist or wrong perms'%(dir))
- return
-
- # TODO: set hostname
- file('/vservers/%s/rootfs/etc/hostname' % name, 'w').write(name)
-
- # Get a connection and lookup for the sliver before actually
- # defining it, just in case it was already defined.
- conn = Sliver_LV.getConnection()
- try:
- dom = conn.lookupByName(name)
- except:
- dom = conn.defineXML(config)
- print Sliver_LV.info(dom)
+# Common Libvirt code
- @staticmethod
- def destroy(name):
- ''' NEVER CALLED... Figure out when and what to do... '''
-
- print "LIBVIRT %s destroy"%(name)
- logger.verbose ('sliver_libvirt: %s destroy'%(name))
-
- dir = '/vservers/%s'%(name)
- lxc_log = '%s/lxc.log'%(dir)
+class Sliver_Libvirt(Account):
- conn = conn.Sliver_LV.getConnection()
+ # Helper methods
- try:
- dom = conn.lookupByName(name)
- conn.destroy(dom)
- conn.undefine(dom)
- print Sliver_LV.info(dom)
- except:
- logger.verbose('sliver_libvirt: %s domain does not exists'%(name))
- print "Unexpected error:", sys.exc_info()[0]
+ @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))
+
+ @staticmethod
+ 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)
def __init__(self, rec):
self.name = rec['name']
- print "LIBVIRT %s __init__"%(self.name)
logger.verbose ('sliver_libvirt: %s init'%(self.name))
-
- self.dir = '/vservers/%s'%(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.disk_usage_initialized = False
- self.initscript = ''
self.enabled = True
- conn = Sliver_LV.getConnection()
+ self.conn = Sliver_Libvirt.getConnection(rec['type'])
+ self.xid = bwlimit.get_xid(self.name)
+
+ dom = None
try:
- self.container = conn.lookupByName(self.name)
+ dom = self.conn.lookupByName(self.name)
except:
- print "Unexpected error:", sys.exc_info()[0]
-
- def configure(self, rec):
- ''' Allocate resources and fancy configuration stuff '''
- print "LIBVIRT %s configure"%(self.name)
- logger.verbose('sliver_libvirt: %s configure'%(self.name))
+ 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
def start(self, delay=0):
''' Just start the sliver '''
- print "LIBVIRT %s start"%(self.name)
+ logger.verbose('sliver_libvirt: %s start'%(self.name))
# 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.container.create()
+ self.dom.create()
else:
logger.verbose('sliver_libvirt: sliver %s already started'%(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%d -j mark --set-mark %d" % \
+ (self.xid, self.xid))
+
def stop(self):
- ''' NEVER CALLED... Figure out when and what to do... '''
-
- print "LIBVIRT %s stop"%(self.name)
logger.verbose('sliver_libvirt: %s stop'%(self.name))
-
+
+ # Remove the ebtables rule before stopping
+ bwlimit.ebtables("-D INPUT -i veth%d -j mark --set-mark %d" % \
+ (self.xid, self.xid))
+
try:
- self.container.destroy()
+ self.dom.destroy()
except:
- print "Unexpected error:", sys.exc_info()[0]
-
+ 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])
+
def is_running(self):
''' Return True if the domain is running '''
- print "LIBVIRT %s is_running"%(self.name)
- logger.verbose('sliver_libvirt: %s is_running'%(self.name))
+ logger.verbose('sliver_libvirt: %s is_running'%self.name)
try:
- [state, _, _, _, _] = self.container.info()
+ [state, _, _, _, _] = self.dom.info()
if state == libvirt.VIR_DOMAIN_RUNNING:
- logger.verbose('sliver_libvirt: %s is RUNNING'%(self.name))
+ logger.verbose('sliver_libvirt: %s is RUNNING'%self.name)
return True
else:
- info = Sliver_LV.info(self.container)
- logger.verbose('sliver_libvirt: %s is NOT RUNNING...\n%s'%(self.name, info))
+ info = debuginfo(self.dom)
+ logger.verbose('sliver_libvirt: %s is ' \
+ 'NOT RUNNING...\n%s'%(self.name, info))
return False
except:
- print "Unexpected error:", sys.exc_info()
+ 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
+
+ def configure(self, rec):
+
+ #sliver.[LXC/QEMU] tolower case
+ #sliver_type = rec['type'].split('.')[1].lower()
+
+ #BASE_DIR = '/cgroup/libvirt/%s/%s/'%(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 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:
+ 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.configure(self, rec)
- ''' PRIVATE/HELPER/STATIC METHODS '''
@staticmethod
- def getConnection():
- ''' Helper method to get a connection to the LXC driver of Libvirt '''
- conn = libvirt.open('lxc:///')
- if conn == None:
- print 'Failed to open connection to LXC hypervisor'
- sys.exit(1)
- else: return conn
+ def get_unique_vif():
+ return 'veth%s' % random.getrandbits(32)
+ # A placeholder until we get true VirtualInterface objects
@staticmethod
- def info(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)
+ def get_interfaces_xml(rec):
+ xml = """
+
+
+
+
+""" % (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 = "" % interface['vlan']
+ else:
+ vlanxml = ""
+ if 'bridge' in interface:
+ tag_xml = tag_xml + """
+
+
+ %s
+
+
+
+ """ % (interface['bridge'], vlanxml, Sliver_Libvirt.get_unique_vif())
+ else:
+ tag_xml = tag_xml + """
+
+
+
+
+ """ % (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