"""LXC slivers"""
-import accounts
-import logger
import subprocess
-import os
-import libvirt
import sys
+import time
+import os, os.path
+import grp
+from pwd import getpwnam
from string import Template
-import bwlimit
-import sliver_libvirt as lv
+# vsys probably should not be a plugin
+# the thing is, the right way to handle stuff would be that
+# if slivers get created by doing a,b,c
+# then they sohuld be delted by doing c,b,a
+# the current ordering model for vsys plugins completely fails to capture that
+from plugins.vsys import removeSliverFromVsys, startService as vsysStartService
+
+import libvirt
+
+import logger
+import plnode.bwlimit as bwlimit
+from initscript import Initscript
+from account import Account
+from sliver_libvirt import Sliver_Libvirt
+
+BTRFS_TIMEOUT=15*60
-class Sliver_LXC(lv.Sliver_Libvirt):
+class Sliver_LXC(Sliver_Libvirt, Initscript):
"""This class wraps LXC commands"""
-
- SHELL = '/bin/sshsh'
-
+
+ SHELL = '/usr/sbin/vsh'
TYPE = 'sliver.LXC'
# Need to add a tag at myplc to actually use this account
# type = 'sliver.LXC'
REF_IMG_BASE_DIR = '/vservers/.lvref'
CON_BASE_DIR = '/vservers'
+ def __init__ (self, rec):
+ name=rec['name']
+ Sliver_Libvirt.__init__ (self,rec)
+ Initscript.__init__ (self,name)
+
+ def configure (self, rec):
+ Sliver_Libvirt.configure (self,rec)
+
+ # in case we update nodemanager..
+ self.install_and_enable_vinit()
+ # do the configure part from Initscript
+ Initscript.configure(self,rec)
+
+ def start(self, delay=0):
+ if 'enabled' in self.rspec and self.rspec['enabled'] <= 0:
+ logger.log('sliver_lxc: not starting %s, is not enabled'%self.name)
+ return
+ # the generic /etc/init.d/vinit script is permanently refreshed, and enabled
+ self.install_and_enable_vinit()
+ # expose .ssh for omf_friendly slivers
+ if 'tags' in self.rspec and 'omf_control' in self.rspec['tags']:
+ Account.mount_ssh_dir(self.name)
+ Sliver_Libvirt.start (self, delay)
+ # if a change has occured in the slice initscript, reflect this in /etc/init.d/vinit.slice
+ self.refresh_slice_vinit()
+
+ def rerun_slice_vinit (self):
+ """This is called whenever the initscript code changes"""
+ # xxx - todo - not sure exactly how to:
+ # (.) invoke something in the guest
+ # (.) which options of systemctl should be used to trigger a restart
+ # should not prevent the first run from going fine hopefully
+ logger.log("WARNING: sliver_lxc.rerun_slice_vinit not implemented yet")
+
@staticmethod
def create(name, rec=None):
- logger.verbose ('sliver_lxc: %s create'%(name))
- conn = lv.getConnection(Sliver_LXC.TYPE)
-
''' Create dirs, copy fs image, lxc_create '''
+ logger.verbose ('sliver_lxc: %s create'%(name))
+ conn = Sliver_Libvirt.getConnection(Sliver_LXC.TYPE)
+
+ vref = rec['vref']
+ if vref is None:
+ vref = "lxc-f18-x86_64"
+ logger.log("sliver_libvirt: %s: WARNING - no vref attached, using hard-wired default %s" % (name,vref))
+
+ # compute guest arch from vref
+ # essentially we want x86_64 (default) or i686 here for libvirt
+ try:
+ (x,y,arch)=vref.split('-')
+ arch = "x86_64" if arch.find("64")>=0 else "i686"
+ except:
+ arch='x86_64'
+
# Get the type of image from vref myplc tags specified as:
# pldistro = lxc
# fcdistro = squeeze
# arch x86_64
- vref = rec['vref']
- if vref is None:
- logger.log('sliver_libvirt: %s: WARNING - no vref attached defaults to lxc-debian' % (name))
- vref = "lxc-squeeze-x86_64"
+
+ arch = 'x86_64'
+ tags = rec['rspec']['tags']
+ if 'arch' in tags:
+ arch = tags['arch']
+ if arch == 'i386':
+ arch = 'i686'
+
+
+
refImgDir = os.path.join(Sliver_LXC.REF_IMG_BASE_DIR, vref)
containerDir = os.path.join(Sliver_LXC.CON_BASE_DIR, name)
# check the template exists -- there's probably a better way..
if not os.path.isdir(refImgDir):
logger.log('sliver_lxc: %s: ERROR Could not create sliver - reference image %s not found' % (name,vref))
+ logger.log('sliver_lxc: %s: ERROR Expected reference image in %s'%(name,refImgDir))
return
+# this hopefully should be fixed now
+# # in fedora20 we have some difficulty in properly cleaning up /vservers/<slicename>
+# # also note that running e.g. btrfs subvolume create /vservers/.lvref/image /vservers/foo
+# # behaves differently, whether /vservers/foo exists or not:
+# # if /vservers/foo does not exist, it creates /vservers/foo
+# # but if it does exist, then it creates /vservers/foo/image !!
+# # so we need to check the expected container rootfs does not exist yet
+# # this hopefully could be removed in a future release
+# if os.path.exists (containerDir):
+# logger.log("sliver_lxc: %s: WARNING cleaning up pre-existing %s"%(name,containerDir))
+# command = ['btrfs', 'subvolume', 'delete', containerDir]
+# logger.log_call(command, BTRFS_TIMEOUT)
+# # re-check
+# if os.path.exists (containerDir):
+# logger.log('sliver_lxc: %s: ERROR Could not create sliver - could not clean up empty %s'%(name,containerDir))
+# return
+
# Snapshot the reference image fs (assume the reference image is in its own
# subvolume)
command = ['btrfs', 'subvolume', 'snapshot', refImgDir, containerDir]
- logger.log_call(command, timeout=15*60)
+ if not logger.log_call(command, timeout=BTRFS_TIMEOUT):
+ logger.log('sliver_lxc: ERROR Could not create BTRFS snapshot at', containerDir)
+ return
+ command = ['chmod', '755', containerDir]
+ logger.log_call(command)
# TODO: set quotas...
# Set hostname. A valid hostname cannot have '_'
- with open(os.path.join(containerDir, 'etc/hostname'), 'w') as f:
- print >>f, name.replace('_', '-')
+ #with open(os.path.join(containerDir, 'etc/hostname'), 'w') as f:
+ # print >>f, name.replace('_', '-')
# Add slices group if not already present
- command = ['/usr/sbin/groupadd', 'slices']
- logger.log_call(command, timeout=15*60)
-
+ try:
+ group = grp.getgrnam('slices')
+ except:
+ command = ['/usr/sbin/groupadd', 'slices']
+ logger.log_call(command)
+
# Add unix account (TYPE is specified in the subclass)
command = ['/usr/sbin/useradd', '-g', 'slices', '-s', Sliver_LXC.SHELL, name, '-p', '*']
- logger.log_call(command, timeout=15*60)
+ logger.log_call(command)
command = ['mkdir', '/home/%s/.ssh'%name]
- logger.log_call(command, timeout=15*60)
+ logger.log_call(command)
# Create PK pair keys to connect from the host to the guest without
# password... maybe remove the need for authentication inside the
# guest?
command = ['su', '-s', '/bin/bash', '-c', 'ssh-keygen -t rsa -N "" -f /home/%s/.ssh/id_rsa'%(name)]
- logger.log_call(command, timeout=15*60)
-
+ logger.log_call(command)
+
command = ['chown', '-R', '%s.slices'%name, '/home/%s/.ssh'%name]
- logger.log_call(command, timeout=15*60)
-
+ logger.log_call(command)
+
command = ['mkdir', '%s/root/.ssh'%containerDir]
- logger.log_call(command, timeout=15*60)
+ logger.log_call(command)
command = ['cp', '/home/%s/.ssh/id_rsa.pub'%name, '%s/root/.ssh/authorized_keys'%containerDir]
- logger.log_call(command, timeout=15*60)
+ logger.log_call(command)
+
+ logger.log("creating /etc/slicename file in %s" % os.path.join(containerDir,'etc/slicename'))
+ try:
+ file(os.path.join(containerDir,'etc/slicename'), 'w').write(name)
+ except:
+ logger.log_exc("exception while creating /etc/slicename")
+
+ try:
+ file(os.path.join(containerDir,'etc/slicefamily'), 'w').write(vref)
+ except:
+ logger.log_exc("exception while creating /etc/slicefamily")
+
+ uid = None
+ try:
+ uid = getpwnam(name).pw_uid
+ except KeyError:
+ # keyerror will happen if user id was not created successfully
+ logger.log_exc("exception while getting user id")
+
+ if uid is not None:
+ logger.log("uid is %d" % uid)
+ command = ['mkdir', '%s/home/%s' % (containerDir, name)]
+ logger.log_call(command)
+ command = ['chown', name, '%s/home/%s' % (containerDir, name)]
+ logger.log_call(command)
+ etcpasswd = os.path.join(containerDir, 'etc/passwd')
+ etcgroup = os.path.join(containerDir, 'etc/group')
+ if os.path.exists(etcpasswd):
+ # create all accounts with gid=1001 - i.e. 'slices' like it is in the root context
+ slices_gid=1001
+ logger.log("adding user %(name)s id %(uid)d gid %(slices_gid)d to %(etcpasswd)s" % (locals()))
+ try:
+ file(etcpasswd,'a').write("%(name)s:x:%(uid)d:%(slices_gid)d::/home/%(name)s:/bin/bash\n" % locals())
+ except:
+ logger.log_exc("exception while updating %s"%etcpasswd)
+ logger.log("adding group slices with gid %(slices_gid)d to %(etcgroup)s"%locals())
+ try:
+ file(etcgroup,'a').write("slices:x:%(slices_gid)d\n"%locals())
+ except:
+ logger.log_exc("exception while updating %s"%etcgroup)
+ sudoers = os.path.join(containerDir, 'etc/sudoers')
+ if os.path.exists(sudoers):
+ try:
+ file(sudoers,'a').write("%s ALL=(ALL) NOPASSWD: ALL\n" % name)
+ except:
+ logger.log_exc("exception while updating /etc/sudoers")
+
+ # customizations for the user environment - root or slice uid
+ # we save the whole business in /etc/planetlab.profile
+ # and source this file for both root and the slice uid's .profile
+ # prompt for slice owner, + LD_PRELOAD for transparently wrap bind
+ pl_profile=os.path.join(containerDir,"etc/planetlab.profile")
+ ld_preload_text="""# by default, we define this setting so that calls to bind(2),
+# when invoked on 0.0.0.0, get transparently redirected to the public interface of this node
+# see https://svn.planet-lab.org/wiki/LxcPortForwarding"""
+ usrmove_path_text="""# VM's before Features/UsrMove need /bin and /sbin in their PATH"""
+ usrmove_path_code="""
+pathmunge () {
+ if ! echo $PATH | /bin/egrep -q "(^|:)$1($|:)" ; then
+ if [ "$2" = "after" ] ; then
+ PATH=$PATH:$1
+ else
+ PATH=$1:$PATH
+ fi
+ fi
+}
+pathmunge /bin after
+pathmunge /sbin after
+unset pathmunge
+"""
+ with open(pl_profile,'w') as f:
+ f.write("export PS1='%s@\H \$ '\n"%(name))
+ f.write("%s\n"%ld_preload_text)
+ f.write("export LD_PRELOAD=/etc/planetlab/lib/bind_public.so\n")
+ f.write("%s\n"%usrmove_path_text)
+ f.write("%s\n"%usrmove_path_code)
+
+ # make sure this file is sourced from both root's and slice's .profile
+ enforced_line = "[ -f /etc/planetlab.profile ] && source /etc/planetlab.profile\n"
+ for path in [ 'root/.profile', 'home/%s/.profile'%name ]:
+ from_root=os.path.join(containerDir,path)
+ # if dir is not yet existing let's forget it for now
+ if not os.path.isdir(os.path.dirname(from_root)): continue
+ found=False
+ try:
+ contents=file(from_root).readlines()
+ for content in contents:
+ if content==enforced_line: found=True
+ except IOError: pass
+ if not found:
+ with open(from_root,"a") as user_profile:
+ user_profile.write(enforced_line)
+ # in case we create the slice's .profile when writing
+ if from_root.find("/home")>=0:
+ command=['chown','%s:slices'%name,from_root]
+ logger.log_call(command)
# Lookup for xid and create template after the user is created so we
# can get the correct xid based on the name of the slice
xid = bwlimit.get_xid(name)
# Template for libvirt sliver configuration
+ template_filename_sliceimage = os.path.join(Sliver_LXC.REF_IMG_BASE_DIR,'lxc_template.xml')
+ if os.path.isfile (template_filename_sliceimage):
+ logger.log("WARNING: using compat template %s"%template_filename_sliceimage)
+ template_filename=template_filename_sliceimage
+ else:
+ logger.log("Cannot find XML template %s"%template_filename_sliceimage)
+ return
+
+ interfaces = Sliver_Libvirt.get_interfaces_xml(rec)
+
try:
- with open(Sliver_LXC.REF_IMG_BASE_DIR + '/config_template.xml') as f:
+ with open(template_filename) as f:
template = Template(f.read())
- xml = template.substitute(name=name, xid=xid)
+ xml = template.substitute(name=name, xid=xid, interfaces=interfaces, arch=arch)
except IOError:
- logger.log('Cannot find XML template file')
+ logger.log('Failed to parse or use XML template file %s'%template_filename)
return
-
+
# Lookup for the sliver before actually
# defining it, just in case it was already defined.
try:
dom = conn.lookupByName(name)
except:
dom = conn.defineXML(xml)
- logger.verbose('lxc_create: %s -> %s'%(name, lv.debuginfo(dom)))
+ logger.verbose('lxc_create: %s -> %s'%(name, Sliver_Libvirt.dom_details(dom)))
@staticmethod
def destroy(name):
+ # umount .ssh directory - only if mounted
+ Account.umount_ssh_dir(name)
logger.verbose ('sliver_lxc: %s destroy'%(name))
- conn = lv.getConnection(Sliver_LXC.TYPE)
-
+ conn = Sliver_Libvirt.getConnection(Sliver_LXC.TYPE)
+
containerDir = Sliver_LXC.CON_BASE_DIR + '/%s'%(name)
try:
# Destroy libvirt domain
dom = conn.lookupByName(name)
except:
- logger.verbose('sliver_lxc: Domain %s does not exist! UNEXPECTED'%name)
+ logger.verbose('sliver_lxc.destroy: Domain %s does not exist!' % name)
return
- try:
+ # Slivers with vsys running will fail the subvolume delete
+ # removeSliverFromVsys return True if it stops vsys, telling us to start it again later
+ vsys_stopped = removeSliverFromVsys (name)
+
+ try:
+ logger.log("sliver_lxc.destroy: destroying domain %s"%name)
dom.destroy()
except:
- logger.verbose('sliver_lxc: Domain %s not running... continuing.'%name)
-
- dom.undefine()
+ logger.verbose('sliver_lxc.destroy: Domain %s not running... continuing.' % name)
+
+ try:
+ logger.log("sliver_lxc.destroy: undefining domain %s"%name)
+ dom.undefine()
+ except:
+ logger.verbose('sliver_lxc.destroy: Domain %s is not defined... continuing.' % name)
# Remove user after destroy domain to force logout
command = ['/usr/sbin/userdel', '-f', '-r', name]
- logger.log_call(command, timeout=15*60)
-
+ logger.log_call(command)
+
# Remove rootfs of destroyed domain
command = ['btrfs', 'subvolume', 'delete', containerDir]
- logger.log_call(command, timeout=15*60)
+ logger.log_call(command, timeout=BTRFS_TIMEOUT)
+
+ # For some reason I am seeing this :
+ #log_call: running command btrfs subvolume delete /vservers/inri_sl1
+ #log_call: ERROR: cannot delete '/vservers/inri_sl1' - Device or resource busy
+ #log_call: Delete subvolume '/vservers/inri_sl1'
+ #log_call:end command (btrfs subvolume delete /vservers/inri_sl1) returned with code 1
+ #
+ # something must have an open handle to a file in there, but I can't find out what it is
+ # the following code aims at gathering data on what is going on in the system at this point in time
+ # note that some time later (typically when the sliver gets re-created) the same
+ # attempt at deleting the subvolume does work
+ # also lsof never shows anything relevant; this is painful..
- logger.verbose('sliver_libvirt: %s destroyed.'%name)
+ if not os.path.exists(containerDir):
+ logger.log('sliver_lxc.destroy: %s cleanly destroyed.'%name)
+ else:
+ # we're in /
+ #logger.log("-TMP-cwd %s : %s"%(name,os.getcwd()))
+ # also lsof never shows anything relevant; this is painful..
+ #logger.log("-TMP-lsof %s"%name)
+ #command=['lsof']
+ #logger.log_call(command)
+ logger.log("-TMP-ls-l %s"%name)
+ command = ['ls', '-l', containerDir]
+ logger.log_call(command)
+ if os.path.exists(containerDir):
+ logger.log('sliver_lxc.destroy: ERROR could not cleanly destroy %s - giving up'%name)
+ if vsys_stopped: vsysStartService()
git://git.onelab.eu / nodemanager.git / blobdiff