3 There are a couple of tricky things going on here. First, the kernel
4 needs disk usage information in order to enforce the quota. However,
5 determining disk usage redundantly strains the disks. Thus, the
6 Sliver_VS.disk_usage_initialized flag is used to determine whether
7 this initialization has been made.
9 Second, it's not currently possible to set the scheduler parameters
10 for a sliver unless that sliver has a running process. /bin/vsh helps
11 us out by reading the configuration file so that it can set the
12 appropriate limits after entering the sliver context. Making the
13 syscall that actually sets the parameters gives a harmless error if no
14 process is running. Thus we keep vm_running on when setting scheduler
15 parameters so that set_sched_params() always makes the syscall, and we
16 don't have to guess if there is a running process or not.
29 from threading import BoundedSemaphore
31 globalsem = BoundedSemaphore()
33 # special constant that tells vserver to keep its existing settings
34 KEEP_LIMIT = vserver.VC_LIM_KEEP
36 # populate the sliver/vserver specific default allocations table,
37 # which is used to look for slice attributes
38 DEFAULT_ALLOCATION = {}
39 for rlimit in vserver.RLIMITS.keys():
41 DEFAULT_ALLOCATION["%s_min"%rlim]=KEEP_LIMIT
42 DEFAULT_ALLOCATION["%s_soft"%rlim]=KEEP_LIMIT
43 DEFAULT_ALLOCATION["%s_hard"%rlim]=KEEP_LIMIT
45 class Sliver_VS(accounts.Account, vserver.VServer):
46 """This class wraps vserver.VServer to make its interface closer to what we need."""
49 TYPE = 'sliver.VServer'
50 _init_disk_info_sem = globalsem
52 def __init__(self, rec):
53 logger.verbose ('initing Sliver_VS with name=%s'%rec['name'])
55 vserver.VServer.__init__(self, rec['name'],logfile='/var/log/nm')
56 except Exception, err:
57 if not isinstance(err, vserver.NoSuchVServer):
58 # Probably a bad vserver or vserver configuration file
59 logger.log_exc(self.name)
60 logger.log('%s: recreating bad vserver' % rec['name'])
61 self.destroy(rec['name'])
62 self.create(rec['name'], rec['vref'])
63 vserver.VServer.__init__(self, rec['name'],logfile='/var/log/nm')
68 self.slice_id = rec['slice_id']
69 self.disk_usage_initialized = False
70 self.initscriptchanged = False
75 def create(name, vref = None):
76 logger.verbose('Sliver_VS:create - name=%s'%name)
80 ### locating the right slicefamily
81 # this is a first draft, and more a proof of concept thing
82 # the idea is to parse vref for dash-separated wishes,
83 # and to project these against the defaults
84 # so e.g. if the default slice family (as found in /etc/planetlab/slicefamily)
85 # is planetlab-f8-i386, then here is what we get
86 # vref=x86_64 -> vuseradd -t planetlab-f8-x86_64
87 # vref=centos5 -> vuseradd -t planetlab-centos5-i386
88 # vref=centos5-onelab -> vuseradd -t onelab-centos5-i386
89 # vref=planetflow -> vuseradd -t planetflow-f8-i386
90 # vref=x86_64-planetflow -> vuseradd -t planetflow-f8-x86_64
93 default=file("/etc/planetlab/slicefamily").read().strip()
94 (pldistro,fcdistro,arch) = default.split("-")
96 known_archs = [ 'i386', 'x86_64' ]
97 known_fcdistros = [ 'centos5', 'f8', 'f9', 'f10', 'f11', 'f12' ]
98 # from the slice attribute: cut dashes and try to figure the meaning
99 slice_wishes = vref.split("-")
100 for wish in slice_wishes:
101 if wish in known_archs:
103 elif wish in known_fcdistros:
109 refname="-".join( (pldistro,fcdistro,arch) )
111 # check the template exists -- there's probably a better way..
112 if not os.path.isdir ("/vservers/.vref/%s"%refname):
113 logger.log("%s (%s) : vref %s not found, using default %s"%(
114 name,vref,refname,default))
116 # reset so arch is right
117 (pldistro,fcdistro,arch) = default.split("-")
118 # could check again, but as we have /etc/slicefamily
119 # there's probably no /vservers/.vref/default
122 # have not found slicefamily
123 logger.log("%s (%s): legacy node - using fallback vrefname 'default'"%(name,vref))
128 logger.log("%s (%s) : unexpected error follows - using 'default'"%(name,vref))
129 logger.log(traceback.format_exc())
133 def personality (arch):
134 personality="linux32"
135 if arch.find("64")>=0:
136 personality="linux64"
139 logger.log_call('/usr/sbin/vuseradd', '-t', refname, name)
140 # export slicename to the slice in /etc/slicename
141 file('/vservers/%s/etc/slicename' % name, 'w').write(name)
142 # set personality: only if needed (if arch's differ)
143 if tools.root_context_arch() != arch:
144 file('/etc/vservers/%s/personality' % name, 'w').write(personality(arch))
145 logger.log('%s: set personality to %s'%(name,personality(arch)))
148 def destroy(name): logger.log_call('/usr/sbin/vuserdel', name)
150 def configure(self, rec):
151 new_rspec = rec['_rspec']
152 if new_rspec != self.rspec:
153 self.rspec = new_rspec
156 new_initscript = rec['initscript']
157 if new_initscript != self.initscript:
158 self.initscript = new_initscript
159 self.initscriptchanged = True
161 accounts.Account.configure(self, rec) # install ssh keys
163 def start(self, delay=0):
164 if self.rspec['enabled'] > 0:
165 logger.log('%s: starting in %d seconds' % (self.name, delay))
167 # VServer.start calls fork() internally,
168 # so just close the nonstandard fds and fork once to avoid creating zombies
169 child_pid = os.fork()
171 if self.initscriptchanged:
172 logger.log('%s: installing initscript' % self.name)
173 def install_initscript():
174 flags = os.O_WRONLY | os.O_CREAT | os.O_TRUNC
175 fd = os.open('/etc/rc.vinit', flags, 0755)
176 os.write(fd, self.initscript)
179 self.chroot_call(install_initscript)
180 except: logger.log_exc(self.name)
181 tools.close_nonstandard_fds()
182 vserver.VServer.start(self)
185 os.waitpid(child_pid, 0)
186 self.initscriptchanged = False
187 else: logger.log('%s: not starting, is not enabled' % self.name)
190 logger.log('%s: stopping' % self.name)
191 vserver.VServer.stop(self)
193 def is_running(self):
194 return vserver.VServer.is_running(self)
196 def set_resources(self,setup=False):
197 disk_max = self.rspec['disk_max']
198 logger.log('%s: setting max disk usage to %d KiB' % (self.name, disk_max))
199 try: # if the sliver is over quota, .set_disk_limit will throw an exception
200 if not self.disk_usage_initialized:
201 self.vm_running = False
202 Sliver_VS._init_disk_info_sem.acquire()
203 logger.log('%s: computing disk usage: beginning' % self.name)
204 try: self.init_disk_info()
205 finally: Sliver_VS._init_disk_info_sem.release()
206 logger.log('%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('%s: failed to set max disk usage' % self.name)
211 logger.log_exc(self.name)
213 # get/set the min/soft/hard values for all of the vserver
214 # related RLIMITS. Note that vserver currently only
215 # implements support for hard limits.
216 for limit in vserver.RLIMITS.keys():
218 minimum = self.rspec['%s_min'%type]
219 soft = self.rspec['%s_soft'%type]
220 hard = self.rspec['%s_hard'%type]
221 update = self.set_rlimit(limit, hard, soft, minimum)
223 logger.log('%s: setting rlimit %s to (%d, %d, %d)'
224 % (self.name, type, hard, soft, minimum))
226 self.set_capabilities_config(self.rspec['capabilities'])
227 if self.rspec['capabilities']:
228 logger.log('%s: setting capabilities to %s' % (self.name, self.rspec['capabilities']))
230 cpu_pct = self.rspec['cpu_pct']
231 cpu_share = self.rspec['cpu_share']
234 for key in self.rspec.keys():
235 if key.find('sysctl.') == 0:
236 sysctl=key.split('.')
238 path="/proc/sys/%s" % ("/".join(sysctl[1:]))
239 logger.log("%s: opening %s"%(self.name,path))
241 fd = os.open(path, flags)
242 logger.log("%s: writing %s=%s"%(self.name,key,self.rspec[key]))
243 os.write(fd,self.rspec[key])
246 logger.log("%s: could not set %s=%s"%(self.name,key,self.rspec[key]))
247 logger.log("%s: error = %s"%(self.name,e))
250 if self.rspec['enabled'] > 0:
252 logger.log('%s: setting cpu reservation to %d%%' % (self.name, cpu_pct))
257 logger.log('%s: setting cpu share to %d' % (self.name, cpu_share))
261 self.set_sched_config(cpu_pct, cpu_share)
262 # if IP address isn't set (even to 0.0.0.0), sliver won't be able to use network
263 if self.rspec['ip_addresses'] != '0.0.0.0':
264 logger.log('%s: setting IP address(es) to %s' % \
265 (self.name, self.rspec['ip_addresses']))
266 self.set_ipaddresses_config(self.rspec['ip_addresses'])
268 if self.is_running():
269 logger.log("%s: Setting name to %s" % (self.name, self.slice_id),2)
270 self.setname(self.slice_id)
272 if self.enabled == False:
276 if False: # Does not work properly yet.
277 if self.have_limits_changed():
278 logger.log('%s: limits have changed --- restarting' % self.name)
280 while self.is_running() and stopcount > 0:
284 stopcount = stopcount - 1
287 else: # tell vsh to disable remote login by setting CPULIMIT to 0
288 logger.log('%s: disabling remote login' % self.name)
289 self.set_sched_config(0, 0)