+# $Id$
+# $URL$
+
"""VServer slivers.
There are a couple of tricky things going on here. First, the kernel
"""
import errno
-import os
+import traceback
+import os, os.path
import time
+
import vserver
import accounts
import logger
import tools
+from threading import BoundedSemaphore
+
+globalsem = BoundedSemaphore()
+# special constant that tells vserver to keep its existing settings
+KEEP_LIMIT = vserver.VC_LIM_KEEP
+
+# populate the sliver/vserver specific default allocations table,
+# which is used to look for slice attributes
+DEFAULT_ALLOCATION = {}
+for rlimit in vserver.RLIMITS.keys():
+ rlim = rlimit.lower()
+ DEFAULT_ALLOCATION["%s_min"%rlim]=KEEP_LIMIT
+ DEFAULT_ALLOCATION["%s_soft"%rlim]=KEEP_LIMIT
+ DEFAULT_ALLOCATION["%s_hard"%rlim]=KEEP_LIMIT
class Sliver_VS(accounts.Account, vserver.VServer):
"""This class wraps vserver.VServer to make its interface closer to what we need."""
SHELL = '/bin/vsh'
TYPE = 'sliver.VServer'
+ _init_disk_info_sem = globalsem
def __init__(self, rec):
+ name=rec['name']
+ logger.verbose ('sliver_vs: %s init'%name)
try:
- vserver.VServer.__init__(self, rec['name'])
- except vserver.NoSuchVServer:
- self.create(rec['name'], rec['type'])
- vserver.VServer.__init__(self, rec['name'])
+ logger.log("sliver_vs: %s: first chance..."%name)
+ vserver.VServer.__init__(self, name,logfile='/var/log/nm')
+ except Exception, err:
+ if not isinstance(err, vserver.NoSuchVServer):
+ # Probably a bad vserver or vserver configuration file
+ logger.log_exc("sliver_vs:__init__ (first chance) %s",name=name)
+ logger.log('sliver_vs: %s: recreating bad vserver' % name)
+ self.destroy(name)
+ self.create(name, rec['vref'])
+ logger.log("sliver_vs: %s: second chance..."%name)
+ vserver.VServer.__init__(self, name,logfile='/var/log/nm')
self.keys = ''
self.rspec = {}
self.initscript = ''
+ self.slice_id = rec['slice_id']
self.disk_usage_initialized = False
+ self.initscriptchanged = False
+ self.enabled = True
self.configure(rec)
@staticmethod
def create(name, vref = None):
- if vref is not None:
- logger.log_call('/usr/sbin/vuseradd', '-t', vref, name)
- else:
- logger.log_call('/usr/sbin/vuseradd', name)
+ logger.verbose('sliver_vs: %s: create'%name)
+ if vref is None:
+ logger.log("sliver_vs: %s: ERROR - no vref attached, this is unexpected"%(name))
+ return
+ # used to look in /etc/planetlab/family,
+ # now relies on the 'GetSliceFamily' extra attribute in GetSlivers()
+ # which for legacy is still exposed here as the 'vref' key
+
+ # check the template exists -- there's probably a better way..
+ if not os.path.isdir ("/vservers/.vref/%s"%vref):
+ logger.log ("sliver_vs: %s: ERROR Could not create sliver - vreference image %s not found"%(name,vref))
+ return
+
+ # guess arch
+ try:
+ (x,y,arch)=vref.split('-')
+ # mh, this of course applies when 'vref' is e.g. 'netflow'
+ # and that's not quite right
+ except:
+ arch='i386'
+
+ def personality (arch):
+ personality="linux32"
+ if arch.find("64")>=0:
+ personality="linux64"
+ return personality
+
+ logger.log_call('/usr/sbin/vuseradd', '-t', vref, name)
+ # export slicename to the slice in /etc/slicename
+ file('/vservers/%s/etc/slicename' % name, 'w').write(name)
+ file('/vservers/%s/etc/slicefamily' % name, 'w').write(vref)
+ # set personality: only if needed (if arch's differ)
+ if tools.root_context_arch() != arch:
+ file('/etc/vservers/%s/personality' % name, 'w').write(personality(arch))
+ logger.log('sliver_vs: %s: set personality to %s'%(name,personality(arch)))
@staticmethod
def destroy(name): logger.log_call('/usr/sbin/vuserdel', name)
new_initscript = rec['initscript']
if new_initscript != self.initscript:
self.initscript = new_initscript
- logger.log('%s: installing initscript' % self.name)
- def install_initscript():
- flags = os.O_WRONLY | os.O_CREAT | os.O_TRUNC
- fd = os.open('/etc/rc.vinit', flags, 0755)
- os.write(fd, new_initscript)
- os.close(fd)
- try: self.chroot_call(install_initscript)
- except: logger.log_exc()
+ self.initscriptchanged = True
accounts.Account.configure(self, rec) # install ssh keys
def start(self, delay=0):
- if self.rspec['enabled']:
- logger.log('%s: starting in %d seconds' % (self.name, delay))
+ if self.rspec['enabled'] > 0:
+ logger.log('sliver_vs: %s: starting in %d seconds' % (self.name, delay))
+ time.sleep(delay)
+ # VServer.start calls fork() internally,
+ # so just close the nonstandard fds and fork once to avoid creating zombies
child_pid = os.fork()
if child_pid == 0:
- # VServer.start calls fork() internally, so just close the nonstandard fds and fork once to avoid creating zombies
+ if self.initscriptchanged:
+ logger.log('sliver_vs: %s: installing initscript' % self.name)
+ def install_initscript():
+ flags = os.O_WRONLY | os.O_CREAT | os.O_TRUNC
+ fd = os.open('/etc/rc.vinit', flags, 0755)
+ os.write(fd, self.initscript)
+ os.close(fd)
+ try:
+ self.chroot_call(install_initscript)
+ except: logger.log_exc("sliver_vs: start",name=self.name)
tools.close_nonstandard_fds()
- time.sleep(delay)
- vserver.VServer.start(self, True)
+ vserver.VServer.start(self)
os._exit(0)
- else: os.waitpid(child_pid, 0)
- else: logger.log('%s: not starting, is not enabled' % self.name)
+ else:
+ os.waitpid(child_pid, 0)
+ self.initscriptchanged = False
+ else: logger.log('sliver_vs: not starting, is not enabled', name=self.name)
def stop(self):
- logger.log('%s: stopping' % self.name)
+ logger.log('sliver_vs: %s: stopping' % self.name)
vserver.VServer.stop(self)
- def set_resources(self):
+ def is_running(self):
+ return vserver.VServer.is_running(self)
+
+ def set_resources(self,setup=False):
disk_max = self.rspec['disk_max']
- logger.log('%s: setting max disk usage to %d KiB' % (self.name, disk_max))
+ logger.log('sliver_vs: %s: setting max disk usage to %d KiB' % (self.name, disk_max))
try: # if the sliver is over quota, .set_disk_limit will throw an exception
if not self.disk_usage_initialized:
self.vm_running = False
- logger.log('%s: computing disk usage' % self.name)
- self.init_disk_info()
+ Sliver_VS._init_disk_info_sem.acquire()
+ logger.log('sliver_vs: %s: computing disk usage: beginning' % self.name)
+ try: self.init_disk_info()
+ finally: Sliver_VS._init_disk_info_sem.release()
+ logger.log('sliver_vs: %s: computing disk usage: ended' % self.name)
self.disk_usage_initialized = True
- vserver.VServer.set_disklimit(self, disk_max)
- except OSError:
- logger.log('%s: failed to set max disk usage' % self.name)
- logger.log_exc()
+ vserver.VServer.set_disklimit(self, max(disk_max, self.disk_blocks))
+ except:
+ logger.log_exc('sliver_vs: failed to set max disk usage',name=self.name)
+
+ # get/set the min/soft/hard values for all of the vserver
+ # related RLIMITS. Note that vserver currently only
+ # implements support for hard limits.
+ for limit in vserver.RLIMITS.keys():
+ type = limit.lower()
+ minimum = self.rspec['%s_min'%type]
+ soft = self.rspec['%s_soft'%type]
+ hard = self.rspec['%s_hard'%type]
+ update = self.set_rlimit(limit, hard, soft, minimum)
+ if update:
+ logger.log('sliver_vs: %s: setting rlimit %s to (%d, %d, %d)'
+ % (self.name, type, hard, soft, minimum))
- net_limits = (self.rspec['net_min'], self.rspec['net_max'], self.rspec['net2_min'], self.rspec['net2_max'], self.rspec['net_share'])
- logger.log('%s: setting net limits to %s bps' % (self.name, net_limits[:-1]))
- logger.log('%s: setting net share to %d' % (self.name, net_limits[-1]))
- self.set_bwlimit(*net_limits)
+ self.set_capabilities_config(self.rspec['capabilities'])
+ if self.rspec['capabilities']:
+ logger.log('sliver_vs: %s: setting capabilities to %s' % (self.name, self.rspec['capabilities']))
- cpu_min = self.rspec['cpu_min']
+ cpu_pct = self.rspec['cpu_pct']
cpu_share = self.rspec['cpu_share']
+
+ if setup:
+ for key in self.rspec.keys():
+ if key.find('sysctl.') == 0:
+ sysctl=key.split('.')
+ try:
+ path="/proc/sys/%s" % ("/".join(sysctl[1:]))
+ logger.log("sliver_vs: %s: opening %s"%(self.name,path))
+ flags = os.O_WRONLY
+ fd = os.open(path, flags)
+ logger.log("sliver_vs: %s: writing %s=%s"%(self.name,key,self.rspec[key]))
+ os.write(fd,self.rspec[key])
+ os.close(fd)
+ except IOError, e:
+ logger.log("sliver_vs: %s: could not set %s=%s"%(self.name,key,self.rspec[key]))
+ logger.log("sliver_vs: %s: error = %s"%(self.name,e))
+
+
if self.rspec['enabled'] > 0:
- if cpu_min >= 50: # at least 5%: keep people from shooting themselves in the foot
- logger.log('%s: setting cpu share to %d%% guaranteed' % (self.name, cpu_min/10.0))
- self.set_sched_config(cpu_min, vserver.SCHED_CPU_GUARANTEED)
+ if cpu_pct > 0:
+ logger.log('sliver_vs: %s: setting cpu reservation to %d%%' % (self.name, cpu_pct))
+ else:
+ cpu_pct = 0
+
+ if cpu_share > 0:
+ logger.log('sliver_vs: %s: setting cpu share to %d' % (self.name, cpu_share))
else:
- logger.log('%s: setting cpu share to %d' % (self.name, cpu_share))
- self.set_sched_config(cpu_share, 0)
+ cpu_share = 0
+
+ self.set_sched_config(cpu_pct, cpu_share)
+ # if IP address isn't set (even to 0.0.0.0), sliver won't be able to use network
+ if self.rspec['ip_addresses'] != '0.0.0.0':
+ logger.log('sliver_vs: %s: setting IP address(es) to %s' % \
+ (self.name, self.rspec['ip_addresses']))
+ self.set_ipaddresses_config(self.rspec['ip_addresses'])
+
+ if self.is_running():
+ logger.log("sliver_vs: %s: Setting name to %s" % (self.name, self.slice_id))
+ self.setname(self.slice_id)
+ ### Sapan's change needs more work
+ # raise IOException, file does not get created
+ # might be that /etc/vservers is not available here, are we in the chroot ?
+ #logger.log("sliver_vs: %s: Storing slice id of %s for PlanetFlow" % (self.name, self.slice_id))
+ #file('/etc/vservers/%s/slice_id' % self.name, 'w').write(self.slice_id)
+
+ if self.enabled == False:
+ self.enabled = True
+ self.start()
+
+ if False: # Does not work properly yet.
+ if self.have_limits_changed():
+ logger.log('sliver_vs: %s: limits have changed --- restarting' % self.name)
+ stopcount = 10
+ while self.is_running() and stopcount > 0:
+ self.stop()
+ delay = 1
+ time.sleep(delay)
+ stopcount = stopcount - 1
+ self.start()
+
else: # tell vsh to disable remote login by setting CPULIMIT to 0
- logger.log('%s: disabling remote login' % self.name)
+ logger.log('sliver_vs: %s: disabling remote login' % self.name)
self.set_sched_config(0, 0)
+ self.enabled = False
self.stop()
git://git.onelab.eu / nodemanager.git / blobdiff