X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=python%2Fvserver.py;h=ee061bbf693936c7e15de3e1c1448560ba20cd23;hb=f061f5d3ea230ebc5132315131c00852ffb58269;hp=9d015b3af154fb8af92e39da23ca27e1da152521;hpb=9ebc9753588a9b7a27ac6f0d296569ad2d141dec;p=util-vserver.git diff --git a/python/vserver.py b/python/vserver.py index 9d015b3..ee061bb 100644 --- a/python/vserver.py +++ b/python/vserver.py @@ -4,32 +4,18 @@ import errno import fcntl import os import re +import signal import sys import time 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 @@ -43,9 +29,6 @@ FLAGS_HIDEINFO = 32 FLAGS_ULIMIT = 64 FLAGS_NAMESPACE = 128 -# default values for new vserver scheduler -SCHED_TOKENS_MIN = 50 -SCHED_TOKENS_MAX = 100 class VServer: @@ -53,20 +36,25 @@ class VServer: INITSCRIPTS = [('/etc/rc.vinit', 'start'), ('/etc/rc.d/rc', '%(runlevel)d')] - def __init__(self, name): + def __init__(self, name, vm_id, vm_running = False, resources = {}): self.name = name - self.config = self.__read_config_file("/etc/vservers.conf") - self.config.update(self.__read_config_file("/etc/vservers/%s.conf" % - self.name)) - 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.ctx = int(self.config["S_CONTEXT"]) + 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 = {} + for config_file in ["/etc/vservers.conf", self.config_file]: + try: + self.config.update(self.__read_config_file(config_file)) + except IOError, ex: + if ex.errno != errno.ENOENT: + raise + self.remove_caps = ~vserverimpl.CAP_SAFE; + self.ctx = vm_id + self.vm_running = vm_running + self.resources = resources config_var_re = re.compile(r"^ *([A-Z_]+)=(.*)\n?$", re.MULTILINE) @@ -81,68 +69,96 @@ class VServer: config[key] = val.strip('"') return config + def __update_config_file(self, filename, newvars): + + # 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 + + # 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): - return os.chroot("%s/%s" % (DEFAULT_VSERVERDIR, self.name)) + os.chroot(self.dir) + os.chdir("/") - def set_disklimit(self, blocktotal): - path = "%s/%s" % (DEFAULT_VSERVERDIR, self.name) - inodes, blockcount, size = vduimpl.vdu(path) - blockcount = blockcount >> 1 + def set_disklimit(self, block_limit): - if blocktotal > blockcount: - vserverimpl.setdlimit(path, self.ctx, blockcount>>1, \ - blocktotal, inodes, -1, 2) + # block_limit is in kB + if block_limit == 0: + vserverimpl.unsetdlimit(self.dir, self.ctx) + return + + if self.vm_running: + block_usage = vserverimpl.DLIMIT_KEEP + inode_usage = vserverimpl.DLIMIT_KEEP else: - # should raise some error value - print "block limit (%d) ignored for vserver %s" %(blocktotal,self.name) + # init_disk_info() must have been called to get usage values + block_usage = self.disk_blocks + inode_usage = self.disk_inodes + + 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): - path = "%s/%s" % (DEFAULT_VSERVERDIR, self.name) + try: - blocksused, blocktotal, inodesused, inodestotal, reserved = \ - vserverimpl.getdlimit(path,self.ctx) + (self.disk_blocks, block_limit, self.disk_inodes, inode_limit, + reserved) = vserverimpl.getdlimit(self.dir, self.ctx) except OSError, ex: - if ex.errno == 3: - # 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, 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?! + if ex.errno != errno.ESRCH: + raise + # get here if no vserver disk limit has been set for xid + block_limit = -1 - # for the new vserver scheduler - else: - global SCHED_TOKENS_MIN, SCHED_TOKENS_MAX - tokensmin = SCHED_TOKENS_MIN - tokensmax = SCHED_TOKENS_MAX - - if besteffort is True: - # magic "interval" value for Andy's scheduler to denote besteffort - interval = 1000 - fillrate = shares - else: - interval = 1001 - fillrate = shares + return block_limit - try: - vserverimpl.setsched(self.ctx,fillrate,interval,tokensmin,tokensmax) - except OSError, ex: - if ex.errno == 22: - print "kernel does not support vserver scheduler" - else: - raise ex + def set_sched(self, cpu_share): + + if cpu_share == int(self.config.get("CPULIMIT", -1)): + return + # XXX - don't want to have to deal with nm_ flags here + cpu_guaranteed = int(self.resources.get("nm_sched_flags", + None) == "guaranteed") + cpu_config = { "CPULIMIT": cpu_share, "CPUGUARANTEED": cpu_guaranteed } + self.__update_config_file(self.config_file, cpu_config) + if self.vm_running: + # caller must ensure cpu_share is consistent with self.resources + vserverimpl.setsched(self.ctx, self.resources) def get_sched(self): # have no way of querying scheduler right now on a per vserver basis @@ -164,11 +180,12 @@ class VServer: 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) + def set_bwlimit(self, share, minrate = 1, maxrate = None, dev = "eth0"): + + if share: + bwlimit.on(self.ctx, dev, share, minrate, maxrate) else: - bwlimit.on(self.ctx, eth, limit, cap, minrate, maxrate) + bwlimit.off(self.ctx, dev) def get_bwlimit(self, eth): # not implemented yet @@ -235,14 +252,14 @@ class VServer: return os.fdopen(fd, mode, bufsize) - def __do_chcontext(self, state_file = None): + def __do_chcontext(self, state_file): - vserverimpl.chcontext(self.ctx, self.remove_caps) - if not state_file: - return - print >>state_file, "S_CONTEXT=%d" % self.ctx - print >>state_file, "S_PROFILE=%s" % self.config.get("S_PROFILE", "") - state_file.close() + if state_file: + print >>state_file, "S_CONTEXT=%u" % self.ctx + print >>state_file, "S_PROFILE=" + state_file.close() + + vserverimpl.chcontext(self.ctx, self.resources) def __prep(self, runlevel, log): @@ -292,6 +309,8 @@ class VServer: def start(self, wait, runlevel = 3): + self.vm_running = True + child_pid = os.fork() if child_pid == 0: # child process @@ -319,6 +338,7 @@ class VServer: # 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 @@ -358,3 +378,21 @@ class VServer: # 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) + + def init_disk_info(self): + + (self.disk_inodes, self.disk_blocks, size) = vduimpl.vdu(self.dir) + + return size + + def stop(self, signal = signal.SIGKILL): + + vserverimpl.killall(self.ctx, signal) + self.vm_running = False