# Copyright 2005 Princeton University
+#$Id: vserver.py,v 1.61 2007/07/18 14:50:49 dhozac Exp $
+
import errno
import fcntl
import os
import sys
import time
import traceback
+import subprocess
+import resource
import mountimpl
import runcmd
from vserverimpl import VS_SCHED_CPU_GUARANTEED as SCHED_CPU_GUARANTEED
from vserverimpl import DLIMIT_INF
from vserverimpl import VC_LIM_KEEP
-
-from vserverimpl import RLIMIT_CPU
-from vserverimpl import RLIMIT_RSS
-from vserverimpl import RLIMIT_NPROC
-from vserverimpl import RLIMIT_NOFILE
-from vserverimpl import RLIMIT_MEMLOCK
-from vserverimpl import RLIMIT_AS
-from vserverimpl import RLIMIT_LOCKS
-from vserverimpl import RLIMIT_SIGPENDING
-from vserverimpl import RLIMIT_MSGQUEUE
from vserverimpl import VLIMIT_NSOCK
from vserverimpl import VLIMIT_OPENFD
from vserverimpl import VLIMIT_ANON
FLAGS_ULIMIT = 64
FLAGS_NAMESPACE = 128
-RLIMITS = {"CPU": RLIMIT_CPU,
- "RSS": RLIMIT_RSS,
- "NPROC": RLIMIT_NPROC,
- "NOFILE": RLIMIT_NOFILE,
- "MEMLOCK": RLIMIT_MEMLOCK,
- "AS": RLIMIT_AS,
- "LOCKS": RLIMIT_LOCKS,
- "SIGPENDING": RLIMIT_SIGPENDING,
- "MSGQUEUE": RLIMIT_MSGQUEUE,
- "NSOCK": VLIMIT_NSOCK,
- "OPENFD": VLIMIT_OPENFD,
- "ANON": VLIMIT_ANON,
- "SHMEM": VLIMIT_SHMEM}
+RLIMITS = { "NSOCK": VLIMIT_NSOCK,
+ "OPENFD": VLIMIT_OPENFD,
+ "ANON": VLIMIT_ANON,
+ "SHMEM": VLIMIT_SHMEM}
+
+# add in the platform supported rlimits
+for entry in resource.__dict__.keys():
+ if entry.find("RLIMIT_")==0:
+ k = entry[len("RLIMIT_"):]
+ if not RLIMITS.has_key(k):
+ RLIMITS[k]=resource.__dict__[entry]
+ else:
+ print "WARNING: duplicate RLIMITS key %s" % k
class NoSuchVServer(Exception): pass
class VServerConfig:
- mapping = {
- 'S_CONTEXT': 'context',
- 'VS_WHITELISTED': 'whitelisted',
- 'CPULIMIT': 'sched/fill-rate2',
- 'CPUGUARANTEED': 'sched/fill-rate',
- 'VS_DISK_MAX': 'dlimits/0/space_total',
- }
-
def __init__(self, name, directory):
- global RLIMITS
- for i in RLIMITS.keys():
- for j in ('HARD', 'SOFT', 'MINIMUM'):
- self.mapping['VS_%s_%s' % (i, j)] = 'rlimits/%s.%s' % (i.lower(), j.replace('MINIMUM', 'min').lower())
self.name = name
self.dir = directory
def get(self, option, default = None):
try:
- filename = self.mapping[option]
- f = open(os.path.join(self.dir, filename), "r")
+ f = open(os.path.join(self.dir, option), "r")
buf = f.readline().rstrip()
f.close()
return buf
- except KeyError, e:
- # No mapping exists for this option
- raise e
except IOError, e:
if default is not None:
return default
else:
raise KeyError, "Key %s is not set for %s" % (option, self.name)
- def update(self, vars):
- for (option, value) in vars.iteritems():
+ def update(self, option, value):
+ try:
+ old_umask = os.umask(0022)
+ filename = os.path.join(self.dir, option)
try:
- old_umask = os.umask(0022)
- filename = os.path.join(self.dir, self.mapping[option])
- try:
- os.makedirs(os.path.dirname(filename), 0755)
- except:
- pass
- f = open(filename, 'w')
+ os.makedirs(os.path.dirname(filename), 0755)
+ except:
+ pass
+ f = open(filename, 'w')
+ if isinstance(value, list):
+ f.write("%s\n" % "\n".join(value))
+ else:
f.write("%s\n" % value)
- f.close()
- os.umask(old_umask)
- except KeyError, e:
- raise KeyError, "Don't know how to handle %s, sorry" % option
+ f.close()
+ os.umask(old_umask)
+ except KeyError, e:
+ raise KeyError, "Don't know how to handle %s, sorry" % option
class VServer:
INITSCRIPTS = [('/etc/rc.vinit', 'start'),
('/etc/rc.d/rc', '%(runlevel)d')]
- def __init__(self, name, vm_id = None, vm_running = False):
+ def __init__(self, name, vm_id = None, vm_running = None):
self.name = name
self.rlimits_changed = False
self.config = VServerConfig(name, "/etc/vservers/%s" % name)
self.remove_caps = ~vserverimpl.CAP_SAFE;
if vm_id == None:
- vm_id = int(self.config.get('S_CONTEXT'))
+ vm_id = int(self.config.get('context'))
self.ctx = vm_id
+ if vm_running == None:
+ vm_running = self.is_running()
self.vm_running = vm_running
def have_limits_changed(self):
def set_rlimit_config(self,type,hard,soft,minimum):
"""Generic set resource limit function for vserver"""
- resources = {}
if hard <> VC_LIM_KEEP:
- resources["VS_%s_HARD"%type] = hard
+ self.config.update('rlimits/%s.hard' % type.lower(), hard)
if soft <> VC_LIM_KEEP:
- resources["VS_%s_SOFT"%type] = soft
+ self.config.update('rlimits/%s.soft' % type.lower(), soft)
if minimum <> VC_LIM_KEEP:
- resources["VS_%s_MINIMUM"%type] = minimum
- if len(resources)>0:
- self.update_resources(resources)
+ self.config.update('rlimits/%s.min' % type.lower(), minimum)
self.set_rlimit_limit(type,hard,soft,minimum)
def get_rlimit_limit(self,type):
def get_rlimit_config(self,type):
"""Generic get resource configuration function for vserver"""
- hard = int(self.config.get("VS_%s_HARD"%type,VC_LIM_KEEP))
- soft = int(self.config.get("VS_%s_SOFT"%type,VC_LIM_KEEP))
- minimum = int(self.config.get("VS_%s_MINIMUM"%type,VC_LIM_KEEP))
+ hard = int(self.config.get("rlimits/%s.hard"%type.lower(),VC_LIM_KEEP))
+ soft = int(self.config.get("rlimits/%s.soft"%type.lower(),VC_LIM_KEEP))
+ minimum = int(self.config.get("rlimits/%s.min"%type.lower(),VC_LIM_KEEP))
return (hard,soft,minimum)
def set_WHITELISTED_config(self,whitelisted):
- resources = {'VS_WHITELISTED': whitelisted}
- self.update_resources(resources)
+ self.config.update('whitelisted', whitelisted)
+
+ def set_capabilities(self, capabilities):
+ return vserverimpl.setbcaps(self.ctx, vserverimpl.text2bcaps(capabilities))
+
+ def set_capabilities_config(self, capabilities):
+ self.config.update('bcapabilities', capabilities)
+ self.set_capabilities(capabilities)
+
+ def get_capabilities(self):
+ return vserverimpl.bcaps2text(vserverimpl.getbcaps(self.ctx))
+
+ def get_capabilities_config(self):
+ return self.config.get('bcapabilities', '')
def __do_chroot(self):
print "Unexpected error with setdlimit for context %d" % self.ctx
- resources = {'VS_DISK_MAX': block_limit}
- self.update_resources(resources)
+ self.config.update('dlimits/0/space_total', block_limit)
def is_running(self):
return vserverimpl.isrunning(self.ctx)
configuration file. This method does not modify the kernel CPU
scheduling parameters for this context. """
- if cpu_share == int(self.config.get("CPULIMIT", -1)):
- return
- cpu_guaranteed = sched_flags & SCHED_CPU_GUARANTEED
- cpu_config = { "CPULIMIT": cpu_share, "CPUGUARANTEED": cpu_guaranteed }
- self.update_resources(cpu_config)
+ if sched_flags & SCHED_CPU_GUARANTEED:
+ cpu_guaranteed = cpu_share
+ else:
+ cpu_guaranteed = 0
+ self.config.update('sched/fill-rate2', cpu_share)
+ self.config.update('sched/fill-rate', cpu_guaranteed)
+
if self.vm_running:
self.set_sched(cpu_share, sched_flags)
print >>state_file, "%u" % self.ctx
state_file.close()
- if vserverimpl.chcontext(self.ctx):
+ if vserverimpl.chcontext(self.ctx, vserverimpl.text2bcaps(self.get_capabilities_config())):
self.set_resources()
vserverimpl.setup_done(self.ctx)
# execute each init script in turn
# XXX - we don't support all scripts that vserver script does
self.__do_chcontext(state_file)
- for cmd in self.INITSCRIPTS + [None]:
- try:
- # enter vserver context
- arg_subst = { 'runlevel': runlevel }
- cmd_args = [cmd[0]] + map(lambda x: x % arg_subst,
- cmd[1:])
- print >>log, "executing '%s'" % " ".join(cmd_args)
- os.spawnvp(os.P_WAIT,cmd[0],*cmd_args)
- except:
- traceback.print_exc()
- os._exit(1)
+ for cmd in self.INITSCRIPTS + [None]:
+ try:
+ # enter vserver context
+ arg_subst = { 'runlevel': runlevel }
+ cmd_args = [cmd[0]] + map(lambda x: x % arg_subst,
+ cmd[1:])
+ print >>log, "executing '%s'" % " ".join(cmd_args)
+ os.spawnvp(os.P_WAIT,cmd[0],*cmd_args)
+ except:
+ traceback.print_exc()
+ os._exit(1)
# we get here due to an exception in the top-level child process
except Exception, ex:
pass
- def update_resources(self, resources):
-
- self.config.update(resources)
-
def init_disk_info(self):
cmd = "/usr/sbin/vdu --script --space --inodes --blocksize 1024 --xid %d %s" % (self.ctx, self.dir)
- (child_stdin, child_stdout, child_stderr) = os.popen3(cmd)
- child_stdin.close()
- line = child_stdout.readline()
+ p = subprocess.Popen(cmd, shell=True, stdin=subprocess.PIPE,
+ stdout=subprocess.PIPE, stderr=subprocess.PIPE,
+ close_fds=True)
+ p.stdin.close()
+ line = p.stdout.readline()
if not line:
- sys.stderr.write(child_stderr.readline())
+ sys.stderr.write(p.stderr.read())
+ p.stdout.close()
+ p.stderr.close()
+ ret = p.wait()
+
(space, inodes) = line.split()
self.disk_inodes = int(inodes)
self.disk_blocks = int(space)