6 There are a couple of tricky things going on here. First, the kernel
7 needs disk usage information in order to enforce the quota. However,
8 determining disk usage redundantly strains the disks. Thus, the
9 Sliver_VS.disk_usage_initialized flag is used to determine whether
10 this initialization has been made.
12 Second, it's not currently possible to set the scheduler parameters
13 for a sliver unless that sliver has a running process. /bin/vsh helps
14 us out by reading the configuration file so that it can set the
15 appropriate limits after entering the sliver context. Making the
16 syscall that actually sets the parameters gives a harmless error if no
17 process is running. Thus we keep vm_running on when setting scheduler
18 parameters so that set_sched_params() always makes the syscall, and we
19 don't have to guess if there is a running process or not.
26 from threading import BoundedSemaphore
28 # the util-vserver-pl module
35 # special constant that tells vserver to keep its existing settings
36 KEEP_LIMIT = vserver.VC_LIM_KEEP
38 # populate the sliver/vserver specific default allocations table,
39 # which is used to look for slice attributes
40 DEFAULT_ALLOCATION = {}
41 for rlimit in vserver.RLIMITS.keys():
43 DEFAULT_ALLOCATION["%s_min"%rlim]=KEEP_LIMIT
44 DEFAULT_ALLOCATION["%s_soft"%rlim]=KEEP_LIMIT
45 DEFAULT_ALLOCATION["%s_hard"%rlim]=KEEP_LIMIT
47 class Sliver_VS(accounts.Account, vserver.VServer):
48 """This class wraps vserver.VServer to make its interface closer to what we need."""
51 TYPE = 'sliver.VServer'
52 _init_disk_info_sem = BoundedSemaphore()
54 def __init__(self, rec):
56 logger.verbose ('sliver_vs: %s init'%name)
58 logger.log("sliver_vs: %s: first chance..."%name)
59 vserver.VServer.__init__(self, name,logfile='/var/log/nodemanager')
60 except Exception, err:
61 if not isinstance(err, vserver.NoSuchVServer):
62 # Probably a bad vserver or vserver configuration file
63 logger.log_exc("sliver_vs:__init__ (first chance) %s",name=name)
64 logger.log('sliver_vs: %s: recreating bad vserver' % name)
66 self.create(name, rec['vref'])
67 logger.log("sliver_vs: %s: second chance..."%name)
68 vserver.VServer.__init__(self, name,logfile='/var/log/nodemanager')
72 self.slice_id = rec['slice_id']
73 self.disk_usage_initialized = False
79 def create(name, vref = None):
80 logger.verbose('sliver_vs: %s: create'%name)
82 logger.log("sliver_vs: %s: ERROR - no vref attached, this is unexpected"%(name))
84 # band-aid for short period as old API doesn't have GetSliceFamily function
86 vref = "planetlab-f8-i386"
88 # used to look in /etc/planetlab/family,
89 # now relies on the 'GetSliceFamily' extra attribute in GetSlivers()
90 # which for legacy is still exposed here as the 'vref' key
92 # check the template exists -- there's probably a better way..
93 if not os.path.isdir ("/vservers/.vref/%s"%vref):
94 logger.log ("sliver_vs: %s: ERROR Could not create sliver - vreference image %s not found"%(name,vref))
99 (x,y,arch)=vref.split('-')
100 # mh, this of course applies when 'vref' is e.g. 'netflow'
101 # and that's not quite right
105 def personality (arch):
106 personality="linux32"
107 if arch.find("64")>=0:
108 personality="linux64"
111 # logger.log_call(['/usr/sbin/vuseradd', '-t', vref, name, ], timeout=15*60)
112 logger.log_call(['/bin/bash','-x','/usr/sbin/vuseradd', '-t', vref, name, ], timeout=15*60)
113 # export slicename to the slice in /etc/slicename
114 file('/vservers/%s/etc/slicename' % name, 'w').write(name)
115 file('/vservers/%s/etc/slicefamily' % name, 'w').write(vref)
116 # set personality: only if needed (if arch's differ)
117 if tools.root_context_arch() != arch:
118 file('/etc/vservers/%s/personality' % name, 'w').write(personality(arch)+"\n")
119 logger.log('sliver_vs: %s: set personality to %s'%(name,personality(arch)))
123 # logger.log_call(['/usr/sbin/vuserdel', name, ])
124 logger.log_call(['/bin/bash','-x','/usr/sbin/vuserdel', name, ])
126 def configure(self, rec):
127 new_rspec = rec['_rspec']
128 if new_rspec != self.rspec:
129 self.rspec = new_rspec
132 new_initscript = rec['initscript']
133 if new_initscript != self.initscript:
134 self.initscript = new_initscript
135 # not used anymore, we always check against the installed script
136 #self.initscriptchanged = True
137 self.refresh_slice_vinit()
139 accounts.Account.configure(self, rec) # install ssh keys
141 # unconditionnally install and enable the generic vinit script
142 # mimicking chkconfig for enabling the generic vinit script
143 # this is hardwired for runlevel 3
144 def install_and_enable_vinit (self):
145 vinit_source="/usr/share/NodeManager/sliver-initscripts/vinit"
146 vinit_script="/vservers/%s/etc/rc.d/init.d/vinit"%self.name
147 rc3_link="/vservers/%s/etc/rc.d/rc3.d/S99vinit"%self.name
148 rc3_target="../init.d/vinit"
150 body=file(vinit_source).read()
151 if tools.replace_file_with_string(vinit_script,body,chmod=0755):
152 logger.log("vsliver_vs: %s: installed generic vinit rc script"%self.name)
153 # create symlink for runlevel 3
154 if not os.path.islink(rc3_link):
156 logger.log("vsliver_vs: %s: creating runlevel3 symlink %s"%(self.name,rc3_link))
157 os.symlink(rc3_target,rc3_link)
159 logger.log_exc("vsliver_vs: %s: failed to create runlevel3 symlink %s"%rc3_link)
161 # this one checks for the existence of the slice initscript
162 # install or remove the slice inistscript, as instructed by the initscript tag
163 def refresh_slice_vinit(self):
165 sliver_initscript="/vservers/%s/etc/rc.d/init.d/vinit.slice"%self.name
166 if tools.replace_file_with_string(sliver_initscript,body,remove_if_empty=True,chmod=0755):
168 logger.log("vsliver_vs: %s: Installed new initscript in %s"%(self.name,sliver_initscript))
170 logger.log("vsliver_vs: %s: Removed obsolete initscript %s"%(self.name,sliver_initscript))
172 def start(self, delay=0):
173 if self.rspec['enabled'] <= 0:
174 logger.log('sliver_vs: not starting %s, is not enabled'%self.name)
176 logger.log('sliver_vs: %s: starting in %d seconds' % (self.name, delay))
178 # the generic /etc/init.d/vinit script is permanently refreshed, and enabled
179 self.install_and_enable_vinit()
180 # if a change has occured in the slice initscript, reflect this in /etc/init.d/vinit.slice
181 self.refresh_slice_vinit()
182 child_pid = os.fork()
184 # VServer.start calls fork() internally,
185 # so just close the nonstandard fds and fork once to avoid creating zombies
186 tools.close_nonstandard_fds()
187 vserver.VServer.start(self)
190 os.waitpid(child_pid, 0)
193 logger.log('sliver_vs: %s: stopping' % self.name)
194 vserver.VServer.stop(self)
196 def is_running(self):
197 return vserver.VServer.is_running(self)
199 def set_resources(self,setup=False):
200 disk_max = self.rspec['disk_max']
201 logger.log('sliver_vs: %s: setting max disk usage to %d KiB' % (self.name, disk_max))
202 try: # if the sliver is over quota, .set_disk_limit will throw an exception
203 if not self.disk_usage_initialized:
204 self.vm_running = False
205 Sliver_VS._init_disk_info_sem.acquire()
206 logger.log('sliver_vs: %s: computing disk usage: beginning' % self.name)
207 # init_disk_info is inherited from VServer
208 try: self.init_disk_info()
209 finally: Sliver_VS._init_disk_info_sem.release()
210 logger.log('sliver_vs: %s: computing disk usage: ended' % self.name)
211 self.disk_usage_initialized = True
212 vserver.VServer.set_disklimit(self, max(disk_max, self.disk_blocks))
214 logger.log_exc('sliver_vs: failed to set max disk usage',name=self.name)
216 # get/set the min/soft/hard values for all of the vserver
217 # related RLIMITS. Note that vserver currently only
218 # implements support for hard limits.
219 for limit in vserver.RLIMITS.keys():
221 minimum = self.rspec['%s_min'%type]
222 soft = self.rspec['%s_soft'%type]
223 hard = self.rspec['%s_hard'%type]
224 update = self.set_rlimit(limit, hard, soft, minimum)
226 logger.log('sliver_vs: %s: setting rlimit %s to (%d, %d, %d)'
227 % (self.name, type, hard, soft, minimum))
229 self.set_capabilities_config(self.rspec['capabilities'])
230 if self.rspec['capabilities']:
231 logger.log('sliver_vs: %s: setting capabilities to %s' % (self.name, self.rspec['capabilities']))
233 cpu_pct = self.rspec['cpu_pct']
234 cpu_share = self.rspec['cpu_share']
238 for key in self.rspec.keys():
239 if key.find('sysctl.') == 0:
240 sysctl=key.split('.')
242 # /etc/vservers/<guest>/sysctl/<id>/
243 dirname = "/etc/vservers/%s/sysctl/%s" % (self.name, count)
245 os.makedirs(dirname, 0755)
248 setting = open("%s/setting" % dirname, "w")
249 setting.write("%s\n" % key.lstrip("sysctl."))
251 value = open("%s/value" % dirname, "w")
252 value.write("%s\n" % self.rspec[key])
256 logger.log("sliver_vs: %s: writing %s=%s"%(self.name,key,self.rspec[key]))
258 logger.log("sliver_vs: %s: could not set %s=%s"%(self.name,key,self.rspec[key]))
259 logger.log("sliver_vs: %s: error = %s"%(self.name,e))
262 if self.rspec['enabled'] > 0:
264 logger.log('sliver_vs: %s: setting cpu reservation to %d%%' % (self.name, cpu_pct))
269 logger.log('sliver_vs: %s: setting cpu share to %d' % (self.name, cpu_share))
273 self.set_sched_config(cpu_pct, cpu_share)
274 # if IP address isn't set (even to 0.0.0.0), sliver won't be able to use network
275 if self.rspec['ip_addresses'] != '0.0.0.0':
276 logger.log('sliver_vs: %s: setting IP address(es) to %s' % \
277 (self.name, self.rspec['ip_addresses']))
278 self.set_ipaddresses_config(self.rspec['ip_addresses'])
280 #logger.log("sliver_vs: %s: Setting name to %s" % (self.name, self.slice_id))
281 #self.setname(self.slice_id)
282 #logger.log("sliver_vs: %s: Storing slice id of %s for PlanetFlow" % (self.name, self.slice_id))
284 vserver_config_path = '/etc/vservers/%s'%self.name
285 if not os.path.exists (vserver_config_path):
286 os.makedirs (vserver_config_path)
287 file('%s/slice_id'%vserver_config_path, 'w').write("%d\n"%self.slice_id)
288 logger.log("sliver_vs: Recorded slice id %d for slice %s"%(self.slice_id,self.name))
290 logger.log("sliver_vs: Could not record slice_id for slice %s. Error: %s"%(self.name,str(e)))
292 logger.log_exc("sliver_vs: Error recording slice id: %s"%str(e),name=self.name)
295 if self.enabled == False:
299 if False: # Does not work properly yet.
300 if self.have_limits_changed():
301 logger.log('sliver_vs: %s: limits have changed --- restarting' % self.name)
303 while self.is_running() and stopcount > 0:
307 stopcount = stopcount - 1
310 else: # tell vsh to disable remote login by setting CPULIMIT to 0
311 logger.log('sliver_vs: %s: disabling remote login' % self.name)
312 self.set_sched_config(0, 0)