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 Initscript.configure(self,rec)
153 Account.configure(self, rec) # install ssh keys
155 def start(self, delay=0):
156 if self.rspec['enabled'] <= 0:
157 logger.log('sliver_vs: not starting %s, is not enabled'%self.name)
159 logger.log('sliver_vs: %s: starting in %d seconds' % (self.name, delay))
161 # the generic /etc/init.d/vinit script is permanently refreshed, and enabled
162 self.install_and_enable_vinit()
163 # expose .ssh for omf_friendly slivers
164 if 'omf_control' in self.rspec['tags']:
165 Account.mount_ssh_dir(self.name)
166 # if a change has occured in the slice initscript, reflect this in /etc/init.d/vinit.slice
167 self.refresh_slice_vinit()
168 child_pid = os.fork()
170 # VServer.start calls fork() internally,
171 # so just close the nonstandard fds and fork once to avoid creating zombies
172 tools.close_nonstandard_fds()
173 vserver.VServer.start(self)
176 os.waitpid(child_pid, 0)
179 logger.log('sliver_vs: %s: stopping' % self.name)
180 vserver.VServer.stop(self)
182 def is_running(self):
183 return vserver.VServer.is_running(self)
185 # this one seems to belong in Initscript at first sight,
186 # but actually depends on the underlying vm techno
187 # so let's keep it here
188 def rerun_slice_vinit(self):
189 command = "/usr/sbin/vserver %s exec /etc/rc.d/init.d/vinit restart" % (self.name)
190 logger.log("vsliver_vs: %s: Rerunning slice initscript: %s" % (self.name, command))
191 subprocess.call(command + "&", stdin=open('/dev/null', 'r'), stdout=open('/dev/null', 'w'), stderr=subprocess.STDOUT, shell=True)
193 def set_resources(self):
194 disk_max = self.rspec['disk_max']
195 logger.log('sliver_vs: %s: setting max disk usage to %d KiB' % (self.name, disk_max))
196 try: # if the sliver is over quota, .set_disk_limit will throw an exception
197 if not self.disk_usage_initialized:
198 self.vm_running = False
199 Sliver_VS._init_disk_info_sem.acquire()
200 logger.log('sliver_vs: %s: computing disk usage: beginning' % self.name)
201 # init_disk_info is inherited from VServer
202 try: self.init_disk_info()
203 finally: Sliver_VS._init_disk_info_sem.release()
204 logger.log('sliver_vs: %s: computing disk usage: ended' % self.name)
205 self.disk_usage_initialized = True
206 vserver.VServer.set_disklimit(self, max(disk_max, self.disk_blocks))
208 logger.log_exc('sliver_vs: failed to set max disk usage',name=self.name)
210 # get/set the min/soft/hard values for all of the vserver
211 # related RLIMITS. Note that vserver currently only
212 # implements support for hard limits.
213 for limit in vserver.RLIMITS.keys():
215 minimum = self.rspec['%s_min'%type]
216 soft = self.rspec['%s_soft'%type]
217 hard = self.rspec['%s_hard'%type]
218 update = self.set_rlimit(limit, hard, soft, minimum)
220 logger.log('sliver_vs: %s: setting rlimit %s to (%d, %d, %d)'
221 % (self.name, type, hard, soft, minimum))
223 self.set_capabilities_config(self.rspec['capabilities'])
224 if self.rspec['capabilities']:
225 logger.log('sliver_vs: %s: setting capabilities to %s' % (self.name, self.rspec['capabilities']))
227 cpu_pct = self.rspec['cpu_pct']
228 cpu_share = self.rspec['cpu_share']
231 for key in self.rspec.keys():
232 if key.find('sysctl.') == 0:
233 sysctl=key.split('.')
235 # /etc/vservers/<guest>/sysctl/<id>/
236 dirname = "/etc/vservers/%s/sysctl/%s" % (self.name, count)
238 os.makedirs(dirname, 0755)
241 setting = open("%s/setting" % dirname, "w")
242 setting.write("%s\n" % key.lstrip("sysctl."))
244 value = open("%s/value" % dirname, "w")
245 value.write("%s\n" % self.rspec[key])
249 logger.log("sliver_vs: %s: writing %s=%s"%(self.name,key,self.rspec[key]))
251 logger.log("sliver_vs: %s: could not set %s=%s"%(self.name,key,self.rspec[key]))
252 logger.log("sliver_vs: %s: error = %s"%(self.name,e))
255 if self.rspec['enabled'] > 0:
257 logger.log('sliver_vs: %s: setting cpu reservation to %d%%' % (self.name, cpu_pct))
262 logger.log('sliver_vs: %s: setting cpu share to %d' % (self.name, cpu_share))
266 self.set_sched_config(cpu_pct, cpu_share)
267 # if IP address isn't set (even to 0.0.0.0), sliver won't be able to use network
268 if self.rspec['ip_addresses'] != '0.0.0.0':
269 logger.log('sliver_vs: %s: setting IP address(es) to %s' % \
270 (self.name, self.rspec['ip_addresses']))
272 if 'isolate_loopback' in self.rspec['tags']:
273 add_loopback = self.rspec['tags']['isolate_loopback'] != "1"
274 self.set_ipaddresses_config(self.rspec['ip_addresses'], add_loopback)
276 #logger.log("sliver_vs: %s: Setting name to %s" % (self.name, self.slice_id))
277 #self.setname(self.slice_id)
278 #logger.log("sliver_vs: %s: Storing slice id of %s for PlanetFlow" % (self.name, self.slice_id))
280 vserver_config_path = '/etc/vservers/%s'%self.name
281 if not os.path.exists (vserver_config_path):
282 os.makedirs (vserver_config_path)
283 file('%s/slice_id'%vserver_config_path, 'w').write("%d\n"%self.slice_id)
284 logger.log("sliver_vs: Recorded slice id %d for slice %s"%(self.slice_id,self.name))
286 logger.log("sliver_vs: Could not record slice_id for slice %s. Error: %s"%(self.name,str(e)))
288 logger.log_exc("sliver_vs: Error recording slice id: %s"%str(e),name=self.name)
291 if self.enabled == False:
295 if False: # Does not work properly yet.
296 if self.have_limits_changed():
297 logger.log('sliver_vs: %s: limits have changed --- restarting' % self.name)
299 while self.is_running() and stopcount > 0:
303 stopcount = stopcount - 1
306 else: # tell vsh to disable remote login by setting CPULIMIT to 0
307 logger.log('sliver_vs: %s: disabling remote login' % self.name)
308 self.set_sched_config(0, 0)