10 from pwd import getpwnam
11 from string import Template
16 import plnode.bwlimit as bwlimit
17 from initscript import Initscript
18 from sliver_libvirt import Sliver_Libvirt
20 class Sliver_LXC(Sliver_Libvirt, Initscript):
21 """This class wraps LXC commands"""
23 SHELL = '/usr/sbin/vsh'
25 # Need to add a tag at myplc to actually use this account
28 REF_IMG_BASE_DIR = '/vservers/.lvref'
29 CON_BASE_DIR = '/vservers'
31 def __init__ (self, rec):
33 Sliver_Libvirt.__init__ (self,rec)
34 Initscript.__init__ (self,name)
36 def configure (self, rec):
37 Sliver_Libvirt.configure (self,rec)
39 # in case we update nodemanager..
40 self.install_and_enable_vinit()
41 # do the configure part from Initscript
42 Initscript.configure(self,rec)
44 def start(self, delay=0):
45 if 'enabled' in self.rspec and self.rspec['enabled'] <= 0:
46 logger.log('sliver_lxc: not starting %s, is not enabled'%self.name)
48 # the generic /etc/init.d/vinit script is permanently refreshed, and enabled
49 self.install_and_enable_vinit()
50 Sliver_Libvirt.start (self, delay)
51 # if a change has occured in the slice initscript, reflect this in /etc/init.d/vinit.slice
52 self.refresh_slice_vinit()
54 def rerun_slice_vinit (self):
55 """This is called whenever the initscript code changes"""
56 # xxx - todo - not sure exactly how to:
57 # (.) invoke something in the guest
58 # (.) which options of systemctl should be used to trigger a restart
59 # should not prevent the first run from going fine hopefully
60 logger.log("WARNING: sliver_lxc.rerun_slice_vinit not implemented yet")
63 def create(name, rec=None):
64 ''' Create dirs, copy fs image, lxc_create '''
65 logger.verbose ('sliver_lxc: %s create'%(name))
66 conn = Sliver_Libvirt.getConnection(Sliver_LXC.TYPE)
68 # Get the type of image from vref myplc tags specified as:
74 tags = rec['rspec']['tags']
82 logger.log('sliver_libvirt: %s: WARNING - no vref attached defaults to lxc-f14' % (name))
83 vref = "lxc-f14-x86_64"
85 refImgDir = os.path.join(Sliver_LXC.REF_IMG_BASE_DIR, vref)
86 containerDir = os.path.join(Sliver_LXC.CON_BASE_DIR, name)
88 # check the template exists -- there's probably a better way..
89 if not os.path.isdir(refImgDir):
90 logger.log('sliver_lxc: %s: ERROR Could not create sliver - reference image %s not found' % (name,vref))
91 logger.log('sliver_lxc: %s: ERROR Expected reference image in %s'%(name,refImgDir))
94 # Snapshot the reference image fs (assume the reference image is in its own
96 command = ['btrfs', 'subvolume', 'snapshot', refImgDir, containerDir]
97 if not logger.log_call(command, timeout=15*60):
98 logger.log('sliver_lxc: ERROR Could not create BTRFS snapshot at', containerDir)
100 command = ['chmod', '755', containerDir]
101 logger.log_call(command, timeout=15*60)
103 # customize prompt for slice owner, + LD_PRELOAD for transparently wrap bind
104 dot_profile=os.path.join(containerDir,"root/.profile")
105 ld_preload_msg="""# by default, we define this setting so that calls to bind(2),
106 # when invoked on 0.0.0.0, get transparently redirected to the public interface of this node
107 # see https://svn.planet-lab.org/wiki/LxcPortForwarding"""
108 usrmove_path_msg="""# VM's before Features/UsrMove need /bin and /sbin in their PATH"""
109 usrmove_path_code="""
111 if ! echo $PATH | /bin/egrep -q "(^|:)$1($|:)" ; then
112 if [ "$2" = "after" ] ; then
120 pathmunge /sbin after
123 with open(dot_profile,'w') as f:
124 f.write("export PS1='%s@\H \$ '\n"%(name))
125 f.write("%s\n"%ld_preload_msg)
126 f.write("export LD_PRELOAD=/etc/planetlab/lib/bind_public.so\n")
127 f.write("%s\n"%usrmove_path_msg)
128 f.write("%s\n"%usrmove_path_code)
130 # TODO: set quotas...
132 # Set hostname. A valid hostname cannot have '_'
133 #with open(os.path.join(containerDir, 'etc/hostname'), 'w') as f:
134 # print >>f, name.replace('_', '-')
136 # Add slices group if not already present
138 group = grp.getgrnam('slices')
140 command = ['/usr/sbin/groupadd', 'slices']
141 logger.log_call(command, timeout=15*60)
143 # Add unix account (TYPE is specified in the subclass)
144 command = ['/usr/sbin/useradd', '-g', 'slices', '-s', Sliver_LXC.SHELL, name, '-p', '*']
145 logger.log_call(command, timeout=15*60)
146 command = ['mkdir', '/home/%s/.ssh'%name]
147 logger.log_call(command, timeout=15*60)
149 # Create PK pair keys to connect from the host to the guest without
150 # password... maybe remove the need for authentication inside the
152 command = ['su', '-s', '/bin/bash', '-c', 'ssh-keygen -t rsa -N "" -f /home/%s/.ssh/id_rsa'%(name)]
153 logger.log_call(command, timeout=60)
155 command = ['chown', '-R', '%s.slices'%name, '/home/%s/.ssh'%name]
156 logger.log_call(command, timeout=30)
158 command = ['mkdir', '%s/root/.ssh'%containerDir]
159 logger.log_call(command, timeout=10)
161 command = ['cp', '/home/%s/.ssh/id_rsa.pub'%name, '%s/root/.ssh/authorized_keys'%containerDir]
162 logger.log_call(command, timeout=30)
164 logger.log("creating /etc/slicename file in %s" % os.path.join(containerDir,'etc/slicename'))
166 file(os.path.join(containerDir,'etc/slicename'), 'w').write(name)
168 logger.log_exc("exception while creating /etc/slicename")
171 file(os.path.join(containerDir,'etc/slicefamily'), 'w').write(vref)
173 logger.log_exc("exception while creating /etc/slicefamily")
177 uid = getpwnam(name).pw_uid
179 # keyerror will happen if user id was not created successfully
180 logger.log_exc("exception while getting user id")
183 logger.log("uid is %d" % uid)
184 command = ['mkdir', '%s/home/%s' % (containerDir, name)]
185 logger.log_call(command, timeout=10)
186 command = ['chown', name, '%s/home/%s' % (containerDir, name)]
187 logger.log_call(command, timeout=10)
188 etcpasswd = os.path.join(containerDir, 'etc/passwd')
189 if os.path.exists(etcpasswd):
190 logger.log("adding user %s id %d to %s" % (name, uid, etcpasswd))
192 file(etcpasswd,'a').write("%s:x:%d:%d::/home/%s:/bin/bash\n" % (name, uid, uid, name))
194 logger.log_exc("exception while updating etc/passwd")
195 sudoers = os.path.join(containerDir, 'etc/sudoers')
196 if os.path.exists(sudoers):
198 file(sudoers,'a').write("%s ALL=(ALL) NOPASSWD: ALL\n" % name)
200 logger.log_exc("exception while updating /etc/sudoers")
202 # Lookup for xid and create template after the user is created so we
203 # can get the correct xid based on the name of the slice
204 xid = bwlimit.get_xid(name)
206 # Template for libvirt sliver configuration
207 template_filename_sliceimage = os.path.join(Sliver_LXC.REF_IMG_BASE_DIR,'lxc_template.xml')
208 if os.path.isfile (template_filename_sliceimage):
209 logger.log("WARNING: using compat template %s"%template_filename_sliceimage)
210 template_filename=template_filename_sliceimage
212 logger.log("Cannot find XML template %s"%template_filename_sliceimage)
215 interfaces = Sliver_Libvirt.get_interfaces_xml(rec)
218 with open(template_filename) as f:
219 template = Template(f.read())
220 xml = template.substitute(name=name, interfaces=interfaces, arch=arch)
222 logger.log('Failed to parse or use XML template file %s'%template_filename)
225 # Lookup for the sliver before actually
226 # defining it, just in case it was already defined.
228 dom = conn.lookupByName(name)
230 dom = conn.defineXML(xml)
231 logger.verbose('lxc_create: %s -> %s'%(name, Sliver_Libvirt.debuginfo(dom)))
236 logger.verbose ('sliver_lxc: %s destroy'%(name))
237 conn = Sliver_Libvirt.getConnection(Sliver_LXC.TYPE)
239 containerDir = Sliver_LXC.CON_BASE_DIR + '/%s'%(name)
242 # Destroy libvirt domain
243 dom = conn.lookupByName(name)
245 logger.verbose('sliver_lxc: Domain %s does not exist!' % name)
250 logger.verbose('sliver_lxc: Domain %s not running... continuing.' % name)
255 logger.verbose('sliver_lxc: Domain %s is not defined... continuing.' % name)
257 # Remove user after destroy domain to force logout
258 command = ['/usr/sbin/userdel', '-f', '-r', name]
259 logger.log_call(command, timeout=15*60)
261 if os.path.exists(os.path.join(containerDir,"vsys")):
262 # Slivers with vsys running will fail the subvolume delete.
263 # A more permanent solution may be to ensure that the vsys module
264 # is called before the sliver is destroyed.
265 logger.log("destroying vsys directory and restarting vsys")
266 logger.log_call(["rm", "-fR", os.path.join(containerDir, "vsys")])
267 logger.log_call(["/etc/init.d/vsys", "restart", ])
269 # Remove rootfs of destroyed domain
270 command = ['btrfs', 'subvolume', 'delete', containerDir]
271 logger.log_call(command, timeout=60)
273 if os.path.exists(containerDir):
274 # oh no, it's still here...
275 logger.log("WARNING: failed to destroy container %s" % containerDir)
277 logger.verbose('sliver_libvirt: %s destroyed.'%name)