X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=python%2Fvserver.py;h=a3524273c80d6c1ec8404b1573003e44b563c9d7;hb=c68cf01c83c1c9fbbc3ba6be36e1871d2aec0f87;hp=aeb05d6b596b28ffdee2b83bd3053856a5161e43;hpb=c8a6d235b30fa22308f7a857ba7aaea3f15ef3cc;p=util-vserver.git diff --git a/python/vserver.py b/python/vserver.py index aeb05d6..a352427 100644 --- a/python/vserver.py +++ b/python/vserver.py @@ -13,7 +13,7 @@ import traceback import mountimpl import runcmd import utmp -import vserverimpl, vduimpl +import vserverimpl import cpulimit, bwlimit from vserverimpl import VS_SCHED_CPU_GUARANTEED as SCHED_CPU_GUARANTEED @@ -63,31 +63,76 @@ RLIMITS = {"CPU": RLIMIT_CPU, 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") + 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(): + 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') + 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 + + 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_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 NoSuchVServer, "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.config = VServerConfig(name, "/etc/vservers/%s" % name) self.remove_caps = ~vserverimpl.CAP_SAFE; if vm_id == None: - vm_id = int(self.config['S_CONTEXT']) + vm_id = int(self.config.get('S_CONTEXT')) self.ctx = vm_id + if vm_running == None: + vm_running = self.is_running() self.vm_running = vm_running def have_limits_changed(self): @@ -147,51 +192,6 @@ class VServer: resources = {'VS_WHITELISTED': whitelisted} self.update_resources(resources) - config_var_re = re.compile(r"^ *([A-Z_]+)=(.*)\n?$", re.MULTILINE) - - def __read_config_file(self, filename): - - f = open(filename, "r") - data = f.read() - f.close() - config = {} - for m in self.config_var_re.finditer(data): - (key, val) = m.groups() - 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 - offset = 0 - for m in self.config_var_re.finditer(data): - (key, val) = m.groups() - newval = todo.pop(key, None) - if newval != None: - data = data[:offset+m.start(2)] + str(newval) + data[offset+m.end(2):] - offset += len(str(newval)) - (m.end(2)-m.start(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() - - # replace old file with new - os.rename(newfile, filename) - def __do_chroot(self): os.chroot(self.dir) @@ -269,8 +269,6 @@ class VServer: 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) @@ -310,8 +308,7 @@ class VServer: def __do_chcontext(self, state_file): if state_file: - print >>state_file, "S_CONTEXT=%u" % self.ctx - print >>state_file, "S_PROFILE=" + print >>state_file, "%u" % self.ctx state_file.close() if vserverimpl.chcontext(self.ctx): @@ -359,10 +356,8 @@ class VServer: raise ex def enter(self): - - state_file = open("/var/run/vservers/%s.ctx" % self.name, "w") self.__do_chroot() - self.__do_chcontext(state_file) + self.__do_chcontext(None) def start(self, wait, runlevel = 3): self.vm_running = True @@ -376,7 +371,7 @@ class VServer: os.setsid() # open state file to record vserver info - state_file = open("/var/run/vservers/%s.ctx" % self.name, "w") + state_file = open("/var/run/vservers/%s" % self.name, "w") # use /dev/null for stdin, /var/log/boot.log for stdout/err os.close(0) @@ -426,14 +421,19 @@ class VServer: 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 + 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() + if not line: + sys.stderr.write(child_stderr.readline()) + (space, inodes) = line.split() + self.disk_inodes = int(inodes) + self.disk_blocks = int(space) + #(self.disk_inodes, self.disk_blocks) = vduimpl.vdu(self.dir) + + return self.disk_blocks * 1024 def stop(self, signal = signal.SIGKILL): vserverimpl.killall(self.ctx, signal)