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))
83 # band-aid for short period as old API doesn't have GetSliceFamily function
84 vref = "planetlab-f8-i386"
87 # used to look in /etc/planetlab/family,
88 # now relies on the 'GetSliceFamily' extra attribute in GetSlivers()
89 # which for legacy is still exposed here as the 'vref' key
91 # check the template exists -- there's probably a better way..
92 if not os.path.isdir ("/vservers/.vref/%s"%vref):
93 logger.log ("sliver_vs: %s: ERROR Could not create sliver - vreference image %s not found"%(name,vref))
98 (x,y,arch)=vref.split('-')
99 # mh, this of course applies when 'vref' is e.g. 'netflow'
100 # and that's not quite right
104 def personality (arch):
105 personality="linux32"
106 if arch.find("64")>=0:
107 personality="linux64"
110 # logger.log_call(['/usr/sbin/vuseradd', '-t', vref, name, ], timeout=15*60)
111 logger.log_call(['/bin/bash','-x','/usr/sbin/vuseradd', '-t', vref, name, ], timeout=15*60)
112 # export slicename to the slice in /etc/slicename
113 file('/vservers/%s/etc/slicename' % name, 'w').write(name)
114 file('/vservers/%s/etc/slicefamily' % name, 'w').write(vref)
115 # set personality: only if needed (if arch's differ)
116 if tools.root_context_arch() != arch:
117 file('/etc/vservers/%s/personality' % name, 'w').write(personality(arch)+"\n")
118 logger.log('sliver_vs: %s: set personality to %s'%(name,personality(arch)))
122 # logger.log_call(['/usr/sbin/vuserdel', name, ])
123 logger.log_call(['/bin/bash','-x','/usr/sbin/vuserdel', name, ])
125 def configure(self, rec):
126 new_rspec = rec['_rspec']
127 if new_rspec != self.rspec:
128 self.rspec = new_rspec
131 new_initscript = rec['initscript']
132 if new_initscript != self.initscript:
133 self.initscript = new_initscript
134 # not used anymore, we always check against the installed script
135 #self.initscriptchanged = True
136 self.refresh_slice_vinit()
138 accounts.Account.configure(self, rec) # install ssh keys
140 # unconditionnally install and enable the generic vinit script
141 # mimicking chkconfig for enabling the generic vinit script
142 # this is hardwired for runlevel 3
143 def install_and_enable_vinit (self):
144 vinit_source="/usr/share/NodeManager/sliver-initscripts/vinit"
145 vinit_script="/vservers/%s/etc/rc.d/init.d/vinit"%self.name
146 rc3_link="/vservers/%s/etc/rc.d/rc3.d/S99vinit"%self.name
147 rc3_target="../init.d/vinit"
149 body=file(vinit_source).read()
150 if tools.replace_file_with_string(vinit_script,body,chmod=0755):
151 logger.log("vsliver_vs: %s: installed generic vinit rc script"%self.name)
152 # create symlink for runlevel 3
153 if not os.path.islink(rc3_link):
155 logger.log("vsliver_vs: %s: creating runlevel3 symlink %s"%(self.name,rc3_link))
156 os.symlink(rc3_target,rc3_link)
158 logger.log_exc("vsliver_vs: %s: failed to create runlevel3 symlink %s"%rc3_link)
160 # this one checks for the existence of the slice initscript
161 # install or remove the slice inistscript, as instructed by the initscript tag
162 def refresh_slice_vinit(self):
164 sliver_initscript="/vservers/%s/etc/rc.d/init.d/vinit.slice"%self.name
165 if tools.replace_file_with_string(sliver_initscript,body,remove_if_empty=True,chmod=0755):
167 logger.log("vsliver_vs: %s: Installed new initscript in %s"%(self.name,sliver_initscript))
169 logger.log("vsliver_vs: %s: Removed obsolete initscript %s"%(self.name,sliver_initscript))
171 def start(self, delay=0):
172 if self.rspec['enabled'] <= 0:
173 logger.log('sliver_vs: not starting %s, is not enabled'%self.name)
175 logger.log('sliver_vs: %s: starting in %d seconds' % (self.name, delay))
177 # the generic /etc/init.d/vinit script is permanently refreshed, and enabled
178 self.install_and_enable_vinit()
179 # if a change has occured in the slice initscript, reflect this in /etc/init.d/vinit.slice
180 self.refresh_slice_vinit()
181 child_pid = os.fork()
183 # VServer.start calls fork() internally,
184 # so just close the nonstandard fds and fork once to avoid creating zombies
185 tools.close_nonstandard_fds()
186 vserver.VServer.start(self)
189 os.waitpid(child_pid, 0)
192 logger.log('sliver_vs: %s: stopping' % self.name)
193 vserver.VServer.stop(self)
195 def is_running(self):
196 return vserver.VServer.is_running(self)
198 def set_resources(self,setup=False):
199 disk_max = self.rspec['disk_max']
200 logger.log('sliver_vs: %s: setting max disk usage to %d KiB' % (self.name, disk_max))
201 try: # if the sliver is over quota, .set_disk_limit will throw an exception
202 if not self.disk_usage_initialized:
203 self.vm_running = False
204 Sliver_VS._init_disk_info_sem.acquire()
205 logger.log('sliver_vs: %s: computing disk usage: beginning' % self.name)
206 # init_disk_info is inherited from VServer
207 try: self.init_disk_info()
208 finally: Sliver_VS._init_disk_info_sem.release()
209 logger.log('sliver_vs: %s: computing disk usage: ended' % self.name)
210 self.disk_usage_initialized = True
211 vserver.VServer.set_disklimit(self, max(disk_max, self.disk_blocks))
213 logger.log_exc('sliver_vs: failed to set max disk usage',name=self.name)
215 # get/set the min/soft/hard values for all of the vserver
216 # related RLIMITS. Note that vserver currently only
217 # implements support for hard limits.
218 for limit in vserver.RLIMITS.keys():
220 minimum = self.rspec['%s_min'%type]
221 soft = self.rspec['%s_soft'%type]
222 hard = self.rspec['%s_hard'%type]
223 update = self.set_rlimit(limit, hard, soft, minimum)
225 logger.log('sliver_vs: %s: setting rlimit %s to (%d, %d, %d)'
226 % (self.name, type, hard, soft, minimum))
228 self.set_capabilities_config(self.rspec['capabilities'])
229 if self.rspec['capabilities']:
230 logger.log('sliver_vs: %s: setting capabilities to %s' % (self.name, self.rspec['capabilities']))
232 cpu_pct = self.rspec['cpu_pct']
233 cpu_share = self.rspec['cpu_share']
236 for key in self.rspec.keys():
237 if key.find('sysctl.') == 0:
238 sysctl=key.split('.')
240 path="/proc/sys/%s" % ("/".join(sysctl[1:]))
241 logger.log("sliver_vs: %s: opening %s"%(self.name,path))
243 fd = os.open(path, flags)
244 logger.log("sliver_vs: %s: writing %s=%s"%(self.name,key,self.rspec[key]))
245 os.write(fd,self.rspec[key])
248 logger.log("sliver_vs: %s: could not set %s=%s"%(self.name,key,self.rspec[key]))
249 logger.log("sliver_vs: %s: error = %s"%(self.name,e))
252 if self.rspec['enabled'] > 0:
254 logger.log('sliver_vs: %s: setting cpu reservation to %d%%' % (self.name, cpu_pct))
259 logger.log('sliver_vs: %s: setting cpu share to %d' % (self.name, cpu_share))
263 self.set_sched_config(cpu_pct, cpu_share)
264 # if IP address isn't set (even to 0.0.0.0), sliver won't be able to use network
265 if self.rspec['ip_addresses'] != '0.0.0.0':
266 logger.log('sliver_vs: %s: setting IP address(es) to %s' % \
267 (self.name, self.rspec['ip_addresses']))
268 self.set_ipaddresses_config(self.rspec['ip_addresses'])
270 #logger.log("sliver_vs: %s: Setting name to %s" % (self.name, self.slice_id))
271 #self.setname(self.slice_id)
272 #logger.log("sliver_vs: %s: Storing slice id of %s for PlanetFlow" % (self.name, self.slice_id))
274 vserver_config_path = '/etc/vservers/%s'%self.name
275 if not os.path.exists (vserver_config_path):
276 os.makedirs (vserver_config_path)
277 file('%s/slice_id'%vserver_config_path, 'w').write("%d\n"%self.slice_id)
278 logger.log("sliver_vs: Recorded slice id %d for slice %s"%(self.slice_id,self.name))
280 logger.log("sliver_vs: Could not record slice_id for slice %s. Error: %s"%(self.name,str(e)))
282 logger.log_exc("sliver_vs: Error recording slice id: %s"%str(e),name=self.name)
285 if self.enabled == False:
289 if False: # Does not work properly yet.
290 if self.have_limits_changed():
291 logger.log('sliver_vs: %s: limits have changed --- restarting' % self.name)
293 while self.is_running() and stopcount > 0:
297 stopcount = stopcount - 1
300 else: # tell vsh to disable remote login by setting CPULIMIT to 0
301 logger.log('sliver_vs: %s: disabling remote login' % self.name)
302 self.set_sched_config(0, 0)