5 There are a couple of tricky things going on here. First, the kernel
6 needs disk usage information in order to enforce the quota. However,
7 determining disk usage redundantly strains the disks. Thus, the
8 Sliver_VS.disk_usage_initialized flag is used to determine whether
9 this initialization has been made.
11 Second, it's not currently possible to set the scheduler parameters
12 for a sliver unless that sliver has a running process. /bin/vsh helps
13 us out by reading the configuration file so that it can set the
14 appropriate limits after entering the sliver context. Making the
15 syscall that actually sets the parameters gives a harmless error if no
16 process is running. Thus we keep vm_running on when setting scheduler
17 parameters so that set_sched_params() always makes the syscall, and we
18 don't have to guess if there is a running process or not.
26 from threading import BoundedSemaphore
29 # the util-vserver-pl module
34 from account import Account
35 from initscript import Initscript
37 # special constant that tells vserver to keep its existing settings
38 KEEP_LIMIT = vserver.VC_LIM_KEEP
40 # populate the sliver/vserver specific default allocations table,
41 # which is used to look for slice attributes
42 DEFAULT_ALLOCATION = {}
43 for rlimit in vserver.RLIMITS.keys():
45 DEFAULT_ALLOCATION["%s_min"%rlim]=KEEP_LIMIT
46 DEFAULT_ALLOCATION["%s_soft"%rlim]=KEEP_LIMIT
47 DEFAULT_ALLOCATION["%s_hard"%rlim]=KEEP_LIMIT
49 class Sliver_VS(vserver.VServer, Account, Initscript):
50 """This class wraps vserver.VServer to make its interface closer to what we need."""
53 TYPE = 'sliver.VServer'
54 _init_disk_info_sem = BoundedSemaphore()
56 def __init__(self, rec):
58 logger.verbose ('sliver_vs: %s init'%name)
60 logger.log("sliver_vs: %s: first chance..."%name)
61 vserver.VServer.__init__(self, name,logfile='/var/log/nodemanager')
62 Account.__init__ (self, name)
63 Initscript.__init__ (self, name)
64 except Exception, err:
65 if not isinstance(err, vserver.NoSuchVServer):
66 # Probably a bad vserver or vserver configuration file
67 logger.log_exc("sliver_vs:__init__ (first chance) %s",name=name)
68 logger.log('sliver_vs: %s: recreating bad vserver' % name)
70 self.create(name, rec)
71 vserver.VServer.__init__(self, name,logfile='/var/log/nodemanager')
72 Account.__init__ (self, name)
73 Initscript.__init__ (self, name)
76 self.slice_id = rec['slice_id']
77 self.disk_usage_initialized = False
79 # xxx this almost certainly is wrong...
83 def create(name, rec = None):
84 logger.verbose('sliver_vs: %s: create'%name)
88 # band-aid for short period as old API doesn't have GetSliceFamily function
89 vref = "planetlab-f8-i386"
90 logger.log("sliver_vs: %s: ERROR - no vref attached, using hard-wired default %s"%(name,vref))
92 # used to look in /etc/planetlab/family,
93 # now relies on the 'GetSliceFamily' extra attribute in GetSlivers()
94 # which for legacy is still exposed here as the 'vref' key
96 # check the template exists -- there's probably a better way..
97 if not os.path.isdir ("/vservers/.vref/%s"%vref):
98 logger.log ("sliver_vs: %s: ERROR Could not create sliver - vreference image %s not found"%(name,vref))
101 # compute guest personality
103 (x,y,arch)=vref.split('-')
104 # mh, this of course applies when 'vref' is e.g. 'netflow'
105 # and that's not quite right
109 def personality (arch): return "linux64" if arch.find("64") >=0 else "linux32"
113 command += ['/bin/bash','-x',]
114 command += ['/usr/sbin/vuseradd', ]
115 if 'attributes' in rec and 'isolate_loopback' in rec['attributes'] and rec['attributes']['isolate_loopback'] == '1':
117 # the vsliver imge to use
118 command += [ '-t', vref, ]
121 logger.log_call(command, timeout=15*60)
122 # export slicename to the slice in /etc/slicename
123 file('/vservers/%s/etc/slicename' % name, 'w').write(name)
124 file('/vservers/%s/etc/slicefamily' % name, 'w').write(vref)
125 # set personality: only if needed (if arch's differ)
126 if tools.root_context_arch() != arch:
127 file('/etc/vservers/%s/personality' % name, 'w').write(personality(arch)+"\n")
128 logger.log('sliver_vs: %s: set personality to %s'%(name,personality(arch)))
132 # need to umount before we trash, otherwise we end up with sequels in
133 # /vservers/slicename/ (namely in home/ )
134 # also because this is a static method we cannot check for 'omf_control'
135 # but it is no big deal as umount_ssh_dir checks before it umounts..
136 Account.umount_ssh_dir(name)
137 logger.log("sliver_vs: destroying %s"%name)
138 logger.log_call(['/bin/bash','-x','/usr/sbin/vuserdel', name, ])
141 def configure(self, rec):
142 # in case we update nodemanager..
143 self.install_and_enable_vinit()
145 new_rspec = rec['_rspec']
146 if new_rspec != self.rspec:
147 self.rspec = new_rspec
150 # do the configure part from Initscript
151 # i.e. install slice initscript if defined
152 Initscript.configure(self, rec)
154 Account.configure(self, rec)
156 # remember configure() always gets called *before* start()
157 # in particular the slice initscript
158 # is expected to be in place already at this point
159 def start(self, delay=0):
160 if self.rspec['enabled'] <= 0:
161 logger.log('sliver_vs: not starting %s, is not enabled'%self.name)
163 logger.log('sliver_vs: %s: starting in %d seconds' % (self.name, delay))
165 # the generic /etc/init.d/vinit script is permanently refreshed, and enabled
166 self.install_and_enable_vinit()
167 # expose .ssh for omf_friendly slivers
168 if 'omf_control' in self.rspec['tags']:
169 Account.mount_ssh_dir(self.name)
170 child_pid = os.fork()
172 # VServer.start calls fork() internally,
173 # so just close the nonstandard fds and fork once to avoid creating zombies
174 tools.close_nonstandard_fds()
175 vserver.VServer.start(self)
178 os.waitpid(child_pid, 0)
181 logger.log('sliver_vs: %s: stopping' % self.name)
182 vserver.VServer.stop(self)
184 def is_running(self):
185 return vserver.VServer.is_running(self)
187 # this one seems to belong in Initscript at first sight,
188 # but actually depends on the underlying vm techno
189 # so let's keep it here
190 def rerun_slice_vinit(self):
191 command = "/usr/sbin/vserver %s exec /etc/rc.d/init.d/vinit restart" % (self.name)
192 logger.log("vsliver_vs: %s: Rerunning slice initscript: %s" % (self.name, command))
193 subprocess.call(command + "&", stdin=open('/dev/null', 'r'), stdout=open('/dev/null', 'w'), stderr=subprocess.STDOUT, shell=True)
195 def set_resources(self):
196 disk_max = self.rspec['disk_max']
197 logger.log('sliver_vs: %s: setting max disk usage to %d KiB' % (self.name, disk_max))
198 try: # if the sliver is over quota, .set_disk_limit will throw an exception
199 if not self.disk_usage_initialized:
200 self.vm_running = False
201 Sliver_VS._init_disk_info_sem.acquire()
202 logger.log('sliver_vs: %s: computing disk usage: beginning' % self.name)
203 # init_disk_info is inherited from VServer
204 try: self.init_disk_info()
205 finally: Sliver_VS._init_disk_info_sem.release()
206 logger.log('sliver_vs: %s: computing disk usage: ended' % self.name)
207 self.disk_usage_initialized = True
208 vserver.VServer.set_disklimit(self, max(disk_max, self.disk_blocks))
210 logger.log_exc('sliver_vs: failed to set max disk usage',name=self.name)
212 # get/set the min/soft/hard values for all of the vserver
213 # related RLIMITS. Note that vserver currently only
214 # implements support for hard limits.
215 for limit in vserver.RLIMITS.keys():
217 minimum = self.rspec['%s_min'%type]
218 soft = self.rspec['%s_soft'%type]
219 hard = self.rspec['%s_hard'%type]
220 update = self.set_rlimit(limit, hard, soft, minimum)
222 logger.log('sliver_vs: %s: setting rlimit %s to (%d, %d, %d)'
223 % (self.name, type, hard, soft, minimum))
225 self.set_capabilities_config(self.rspec['capabilities'])
226 if self.rspec['capabilities']:
227 logger.log('sliver_vs: %s: setting capabilities to %s' % (self.name, self.rspec['capabilities']))
229 cpu_pct = self.rspec['cpu_pct']
230 cpu_share = self.rspec['cpu_share']
233 for key in self.rspec.keys():
234 if key.find('sysctl.') == 0:
235 sysctl=key.split('.')
237 # /etc/vservers/<guest>/sysctl/<id>/
238 dirname = "/etc/vservers/%s/sysctl/%s" % (self.name, count)
240 os.makedirs(dirname, 0755)
243 setting = open("%s/setting" % dirname, "w")
244 setting.write("%s\n" % key.lstrip("sysctl."))
246 value = open("%s/value" % dirname, "w")
247 value.write("%s\n" % self.rspec[key])
251 logger.log("sliver_vs: %s: writing %s=%s"%(self.name,key,self.rspec[key]))
253 logger.log("sliver_vs: %s: could not set %s=%s"%(self.name,key,self.rspec[key]))
254 logger.log("sliver_vs: %s: error = %s"%(self.name,e))
257 if self.rspec['enabled'] > 0:
259 logger.log('sliver_vs: %s: setting cpu reservation to %d%%' % (self.name, cpu_pct))
264 logger.log('sliver_vs: %s: setting cpu share to %d' % (self.name, cpu_share))
268 self.set_sched_config(cpu_pct, cpu_share)
269 # if IP address isn't set (even to 0.0.0.0), sliver won't be able to use network
270 if self.rspec['ip_addresses'] != '0.0.0.0':
271 logger.log('sliver_vs: %s: setting IP address(es) to %s' % \
272 (self.name, self.rspec['ip_addresses']))
274 if 'isolate_loopback' in self.rspec['tags']:
275 add_loopback = self.rspec['tags']['isolate_loopback'] != "1"
276 self.set_ipaddresses_config(self.rspec['ip_addresses'], add_loopback)
278 #logger.log("sliver_vs: %s: Setting name to %s" % (self.name, self.slice_id))
279 #self.setname(self.slice_id)
280 #logger.log("sliver_vs: %s: Storing slice id of %s for PlanetFlow" % (self.name, self.slice_id))
282 vserver_config_path = '/etc/vservers/%s'%self.name
283 if not os.path.exists (vserver_config_path):
284 os.makedirs (vserver_config_path)
285 file('%s/slice_id'%vserver_config_path, 'w').write("%d\n"%self.slice_id)
286 logger.log("sliver_vs: Recorded slice id %d for slice %s"%(self.slice_id,self.name))
288 logger.log("sliver_vs: Could not record slice_id for slice %s. Error: %s"%(self.name,str(e)))
290 logger.log_exc("sliver_vs: Error recording slice id: %s"%str(e),name=self.name)
293 if self.enabled == False:
297 if False: # Does not work properly yet.
298 if self.have_limits_changed():
299 logger.log('sliver_vs: %s: limits have changed --- restarting' % self.name)
301 while self.is_running() and stopcount > 0:
305 stopcount = stopcount - 1
308 else: # tell vsh to disable remote login by setting CPULIMIT to 0
309 logger.log('sliver_vs: %s: disabling remote login' % self.name)
310 self.set_sched_config(0, 0)