import traceback
import mountimpl
-import linuxcaps
import passfdimpl
import utmp
import vserverimpl, vduimpl
+import cpulimit, bwlimit
+
-from util_vserver_vars import *
-
-CAP_SAFE = (linuxcaps.CAP_CHOWN |
- linuxcaps.CAP_DAC_OVERRIDE |
- linuxcaps.CAP_DAC_READ_SEARCH |
- linuxcaps.CAP_FOWNER |
- linuxcaps.CAP_FSETID |
- linuxcaps.CAP_KILL |
- linuxcaps.CAP_SETGID |
- linuxcaps.CAP_SETUID |
- linuxcaps.CAP_SETPCAP |
- linuxcaps.CAP_SYS_TTY_CONFIG |
- linuxcaps.CAP_LEASE |
- linuxcaps.CAP_SYS_CHROOT |
- linuxcaps.CAP_SYS_PTRACE)
#
# these are the flags taken from the kernel linux/vserver/legacy.h
FLAGS_ULIMIT = 64
FLAGS_NAMESPACE = 128
+# default values for new vserver scheduler
+SCHED_TOKENS_MIN = 50
+SCHED_TOKENS_MAX = 100
+SCHED_TOKENS = 100
+SCHED_INTERVAL = 1000
class VServer:
def __init__(self, name):
self.name = name
+ self.config_file = "/etc/vservers/%s.conf" % name
+ self.dir = "%s/%s" % (vserverimpl.VSERVER_BASEDIR, name)
+ if not (os.path.isdir(self.dir) and
+ os.access(self.dir, os.R_OK | os.W_OK | os.X_OK)):
+ raise Exception, "no such vserver: " + name
self.config = self.__read_config_file("/etc/vservers.conf")
- self.config.update(self.__read_config_file("/etc/vservers/%s.conf" %
- self.name))
+ self.config.update(self.__read_config_file(self.config_file))
self.flags = 0
flags = self.config["S_FLAGS"].split(" ")
if "lock" in flags:
self.flags |= FLAGS_LOCK
if "nproc" in flags:
self.flags |= FLAGS_NPROC
- self.remove_caps = ~CAP_SAFE
+ self.remove_caps = ~vserverimpl.CAP_SAFE;
self.ctx = int(self.config["S_CONTEXT"])
config_var_re = re.compile(r"^ *([A-Z_]+)=(.*)\n?$", re.MULTILINE)
config[key] = val.strip('"')
return config
- def __do_chroot(self):
+ def __update_config_file(self, filename, newvars):
- return os.chroot("%s/%s" % (VROOTDIR, self.name))
+ # read old file, apply changes
+ f = open(filename, "r")
+ data = f.read()
+ f.close()
+ todo = newvars.copy()
+ changed = False
+ for m in self.config_var_re.finditer(data):
+ (key, val) = m.groups()
+ newval = todo.pop(key, None)
+ if newval != None:
+ data = data[:m.start(2)] + str(newval) + data[m.end(2):]
+ changed = True
+ for (newkey, newval) in todo.items():
+ data += "%s=%s\n" % (newkey, newval)
+ changed = True
+
+ if not changed:
+ return
- def set_dlimit(self, blocktotal):
- path = "%s/%s" % (VROOTDIR, self.name)
- inodes, blockcount, size = vduimpl.vdu(path)
- vserverimpl.setdlimit(path, self.ctx, blockcount>>1, blocktotal, inodes, -1, 2)
+ # write new file
+ newfile = filename + ".new"
+ f = open(newfile, "w")
+ f.write(data)
+ f.close()
+
+ # 'copy' original file, rename new to original
+ backup = filename + ".old"
+ try:
+ os.unlink(backup)
+ except OSError, ex:
+ if ex.errno != errno.ENOENT:
+ raise
+ os.link(filename, backup)
+ os.rename(newfile, filename)
+
+ def __do_chroot(self):
+
+ os.chroot(self.dir)
+ os.chdir("/")
+
+ def set_disklimit(self, block_limit):
+
+ # block_limit is in kB, get_disk_usage() must have been called
+ if self.disk_usage_set:
+ block_usage = vserverimpl.DLIMIT_KEEP
+ inode_usage = vserverimpl.DLIMIT_KEEP
+ else:
+ block_usage = self.disk_blocks
+ inode_usage = self.disk_inodes
+ if block_limit < block_usage:
+ raise Exception, ("%s disk usage (%u blocks) > limit (%u)" %
+ (self.name, block_usage, block_limit))
+ self.disk_usage_set = True
+
+ vserverimpl.setdlimit(self.dir,
+ self.ctx,
+ block_usage,
+ block_limit,
+ inode_usage,
+ vserverimpl.DLIMIT_INF, # inode limit
+ 2) # %age reserved for root
+
+ def get_disklimit(self):
- def get_dlimit(self):
- path = "%s/%s" % (VROOTDIR, self.name)
try:
blocksused, blocktotal, inodesused, inodestotal, reserved = \
- vserverimpl.getdlimit(path,self.ctx)
+ vserverimpl.getdlimit(self.dir, self.ctx)
except OSError, ex:
- if ex.errno == 3:
+ if ex.errno == errno.ESRCH:
# get here if no vserver disk limit has been set for xid
# set blockused to -1 to indicate no limit
blocktotal = -1
return blocktotal
+ def set_sched(self, shares = 32, besteffort = True):
+ # for the old CKRM scheduler
+ if cpulimit.checkckrm() is True:
+ cpulimit.cpuinit()
+ cpulimit.vs2ckrm_on(self.name)
+ try:
+ cpulimit.cpulimit(self.name,shares)
+ except OSError, ex:
+ if ex.errno == 22:
+ print "invalid shares argument"
+ # should re-raise exception?!
+
+ # for the new vserver scheduler
+ else:
+ global SCHED_TOKENS_MIN, SCHED_TOKENS_MAX, SCHED_TOKENS, SCHED_INTERVAL
+ tokensmin = SCHED_TOKENS_MIN
+ tokensmax = SCHED_TOKENS_MAX
+ tokens = SCHED_TOKENS
+ interval = SCHED_INTERVAL
+ fillrate = shares
+
+ if besteffort is True:
+ cpuguaranteed = 0
+ else:
+ cpuguaranteed = 1
+
+ try:
+ vserverimpl.setsched(self.ctx,fillrate,interval,tokens,tokensmin,tokensmax,cpuguaranteed)
+ except OSError, ex:
+ if ex.errno == 22:
+ print "kernel does not support vserver scheduler"
+ else:
+ raise ex
+
+ def get_sched(self):
+ # have no way of querying scheduler right now on a per vserver basis
+ return (-1, False)
+
+ def set_memlimit(self, limit):
+ ret = vserverimpl.setrlimit(self.ctx,5,limit)
+ return ret
+
+ def get_memlimit(self):
+ ret = vserverimpl.getrlimit(self.ctx,5)
+ return ret
+
+ def set_tasklimit(self, limit):
+ ret = vserverimpl.setrlimit(self.ctx,6,limit)
+ return ret
+
+ def get_tasklimit(self):
+ ret = vserverimpl.getrlimit(self.ctx,6)
+ return ret
+
+ def set_bwlimit(self, eth, limit, cap, minrate, maxrate):
+ if cap == "-1":
+ bwlimit.off(self.ctx,eth)
+ else:
+ bwlimit.on(self.ctx, eth, limit, cap, minrate, maxrate)
+
+ def get_bwlimit(self, eth):
+ # not implemented yet
+ bwlimit = -1
+ cap = "unknown"
+ minrate = "unknown"
+ maxrate = "unknown"
+ return (bwlimit, cap, minrate, maxrate)
+
def open(self, filename, mode = "r", bufsize = -1):
(sendsock, recvsock) = passfdimpl.socketpair()
def __do_chcontext(self, state_file = None):
- vserverimpl.chcontext(self.ctx, self.remove_caps)
+ vserverimpl.chcontext(self.ctx)
+
if not state_file:
return
print >>state_file, "S_CONTEXT=%d" % self.ctx
def start(self, wait, runlevel = 3):
+ # XXX - temporary hack
+ self.set_disklimit(int(self.config.get("DISKLIMIT", 5000000)))
+
child_pid = os.fork()
if child_pid == 0:
# child process
self.__do_chroot()
log = open("/var/log/boot.log", "w", 0)
os.dup2(1, 2)
+ # XXX - close all other fds
print >>log, ("%s: starting the virtual server %s" %
(time.asctime(time.gmtime()), self.name))
# execute each init script in turn
# XXX - we don't support all scripts that vserver script does
cmd_pid = 0
+ first_child = True
for cmd in self.INITSCRIPTS + [None]:
# wait for previous command to terminate, unless it
# is the last one and the caller has specified to wait
# parent process
return child_pid
+
+ def update_resources(self, resources):
+
+ self.config.update(resources)
+
+ # write new values to configuration file
+ self.__update_config_file(self.config_file, resources)
+
+ # disklimit can be applied without a process in context
+ disklimit = resources.get("DISKLIMIT", 0)
+ if disklimit:
+ self.set_disklimit(disklimit)
+
+ #
+ # Figure out if any processes are active in context, apply new
+ # values if there are.
+ #
+
+ def init_disk_info(self):
+
+ (self.disk_inodes, self.disk_blocks, size) = vduimpl.vdu(self.dir)
+ self.disk_usage_set = False
+
+ return size
git://git.onelab.eu / util-vserver.git / blobdiff