"""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 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 should be deleted 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
-class Sliver_LXC(lv.Sliver_Libvirt):
+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(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):
+ logger.log('========== sliver_lxc.configure {}'.format(self.name))
+ 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)
+
+ # remember configure() always gets called *before* start()
+ # in particular the slice initscript
+ # is expected to be in place already at this point
+ def start(self, delay=0):
+ logger.log('==================== sliver_lxc.start {}'.format(self.name))
+ if 'enabled' in self.rspec and self.rspec['enabled'] <= 0:
+ logger.log('sliver_lxc: not starting {}, is not enabled'.format(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)
+# logger.log("NM is exiting for debug - just about to start {}".format(self.name))
+# exit(0)
+ Sliver_Libvirt.start(self, delay)
+
+ def rerun_slice_vinit(self):
+ """This is called at startup, and whenever the initscript code changes"""
+ logger.log("sliver_lxc.rerun_slice_vinit {}".format(self.name))
+ plain = "virsh -c lxc:/// lxc-enter-namespace --noseclabel -- {} /usr/bin/systemctl --system daemon-reload"\
+ .format(self.name)
+ command = plain.split()
+ logger.log_call(command, timeout=3)
+ plain = "virsh -c lxc:/// lxc-enter-namespace --noseclabel -- {} /usr/bin/systemctl restart vinit.service"\
+ .format(self.name)
+ command = plain.split()
+ logger.log_call(command, timeout=3)
+
+
@staticmethod
def create(name, rec=None):
- logger.verbose ('sliver_lxc: %s create'%(name))
- conn = lv.getConnection(Sliver_LXC.TYPE)
-
- # Template for libvirt sliver configuration
+ '''
+ Create dirs, copy fs image, lxc_create
+ '''
+ logger.verbose('sliver_lxc: {} create'.format(name))
+ conn = Sliver_Libvirt.getConnection(Sliver_LXC.TYPE)
+
+ vref = rec['vref']
+ if vref is None:
+ vref = "lxc-f24-x86_64"
+ logger.log("sliver_libvirt: {}: WARNING - no vref attached, using hard-wired default {}"
+ .format(name, vref))
+
+ # compute guest arch from vref
+ # essentially we want x86_64 (default) or i686 here for libvirt
try:
- with open(Sliver_LXC.REF_IMG_BASE_DIR + '/config_template.xml') as f:
- template = Template(f.read())
- xml = template.substitute(name=name)
- except IOError:
- logger.log('Cannot find XML template file')
- return
-
- ''' Create dirs, copy fs image, lxc_create '''
+ (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: {}: ERROR Could not create sliver - reference image {} not found'
+ .format(name, vref))
+ logger.log('sliver_lxc: {}: ERROR Expected reference image in {}'.format(name, refImgDir))
return
- # Snapshot the reference image fs (assume the reference image is in its own
- # subvolume)
+# during some time this fragment had been commented out
+# but we're seeing cases where this code might actually be useful, so..
+# 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: {}: WARNING cleaning up pre-existing {}".format(name, containerDir))
+ command = ['btrfs', 'subvolume', 'delete', containerDir]
+ logger.log_call(command, BTRFS_TIMEOUT)
+ # re-check
+ if os.path.exists (containerDir):
+ logger.log('sliver_lxc: {}: ERROR Could not create sliver - could not clean up empty {}'
+ .format(name, containerDir))
+ return
+
+ # Snapshot the reference image fs
+ # this assumes 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 {}'
+ .format(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)
- command = ['mkdir', '/home/%s/.ssh'%name]
- logger.log_call(command, timeout=15*60)
+ logger.log_call(command)
+ command = ['mkdir', '/home/{}/.ssh'.format(name)]
+ 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)
-
- command = ['chown', '-R', '%s.slices'%name, '/home/%s/.ssh'%name]
- logger.log_call(command, timeout=15*60)
-
- command = ['mkdir', '%s/root/.ssh'%containerDir]
- logger.log_call(command, timeout=15*60)
-
- command = ['cp', '/home/%s/.ssh/id_rsa.pub'%name, '%s/root/.ssh/authorized_keys'%containerDir]
- logger.log_call(command, timeout=15*60)
+ command = ['su', '-s', '/bin/bash', '-c',
+ 'ssh-keygen -t rsa -N "" -f /home/{}/.ssh/id_rsa'.format(name)]
+ logger.log_call(command)
+
+ command = ['chown', '-R', '{}:slices'.format(name), '/home/{}/.ssh'.format(name)]
+ logger.log_call(command)
+
+ command = ['mkdir', '{}/root/.ssh'.format(containerDir)]
+ logger.log_call(command)
+
+ command = ['cp', '/home/{}/.ssh/id_rsa.pub'.format(name),
+ '{}/root/.ssh/authorized_keys'.format(containerDir)]
+ logger.log_call(command)
+
+ logger.log("creating /etc/slicename file in {}".format(os.path.join(containerDir, 'etc/slicename')))
+ try:
+ with open(os.path.join(containerDir, 'etc/slicename'), 'w') as f:
+ f.write(name)
+ except:
+ logger.log_exc("exception while creating /etc/slicename")
+
+ try:
+ with open(os.path.join(containerDir, 'etc/slicefamily'), 'w') as f:
+ f.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 {}".format(uid))
+ command = ['mkdir', '{}/home/{}'.format(containerDir, name)]
+ logger.log_call(command)
+ command = ['chown', name, '{}/home/{}'.format(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} id {uid} gid {slices_gid} to {etcpasswd}"
+ .format(**(locals())))
+ try:
+ with open(etcpasswd, 'a') as passwdfile:
+ passwdfile.write("{name}:x:{uid}:{slices_gid}::/home/{name}:/bin/bash\n"
+ .format(**locals()))
+ except:
+ logger.log_exc("exception while updating {}".format(etcpasswd))
+ logger.log("adding group slices with gid {slices_gid} to {etcgroup}"
+ .format(**locals()))
+ try:
+ with open(etcgroup, 'a') as groupfile:
+ groupfile.write("slices:x:{slices_gid}\n"
+ .format(**locals()))
+ except:
+ logger.log_exc("exception while updating {}".format(etcgroup))
+ sudoers = os.path.join(containerDir, 'etc/sudoers')
+ if os.path.exists(sudoers):
+ try:
+ with open(sudoers, 'a') as f:
+ f.write("{} ALL=(ALL) NOPASSWD: ALL\n".format(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='{}@\H \$ '\n".format(name))
+ f.write("{}\n".format(ld_preload_text))
+ f.write("export LD_PRELOAD=/etc/planetlab/lib/bind_public.so\n")
+ f.write("{}\n".format(usrmove_path_text))
+ f.write("{}\n".format(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/{}/.profile'.format(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:
+ with open(from_root) as f:
+ contents = f.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', '{}:slices'.format(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.verbose("Using XML template {}".format(template_filename_sliceimage))
+ template_filename = template_filename_sliceimage
+ else:
+ logger.log("Cannot find XML template {}".format(template_filename_sliceimage))
+ return
+
+ interfaces = Sliver_Libvirt.get_interfaces_xml(rec)
+
+ try:
+ with open(template_filename) as f:
+ template = Template(f.read())
+ xml = template.substitute(name=name, xid=xid, interfaces=interfaces, arch=arch)
+ except IOError:
+ logger.log('Failed to parse or use XML template file {}'.format(template_filename))
+ return
# Lookup for the sliver before actually
# defining it, just in case it was already defined.
dom = conn.lookupByName(name)
except:
dom = conn.defineXML(xml)
- logger.verbose('lxc_create: %s -> %s'%(name, lv.debuginfo(dom)))
+ logger.verbose('lxc_create: {} -> {}'.format(name, Sliver_Libvirt.dom_details(dom)))
@staticmethod
def destroy(name):
- logger.verbose ('sliver_lxc: %s destroy'%(name))
- conn = lv.getConnection(Sliver_LXC.TYPE)
-
- containerDir = Sliver_LXC.CON_BASE_DIR + '/%s'%(name)
+ # umount .ssh directory - only if mounted
+ Account.umount_ssh_dir(name)
+ logger.verbose ('sliver_lxc: {} destroy'.format(name))
+ conn = Sliver_Libvirt.getConnection(Sliver_LXC.TYPE)
+
+ containerDir = os.path.join(Sliver_LXC.CON_BASE_DIR, 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 {} does not exist!'.format(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 {}".format(name))
dom.destroy()
except:
- logger.verbose('sliver_lxc: Domain %s not running... continuing.'%name)
-
- dom.undefine()
+ logger.verbose("sliver_lxc.destroy: Domain {} not running... continuing.".format(name))
+
+ try:
+ logger.log("sliver_lxc.destroy: undefining domain {}".format(name))
+ dom.undefine()
+ except:
+ logger.verbose('sliver_lxc.destroy: Domain {} is not defined... continuing.'.format(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 = ['/usr/bin/rm', '-rf', containerDir]
+ logger.log_call(command, timeout=BTRFS_TIMEOUT)
+
+ # ???
+ logger.log("-TMP-ls-l {}".format(name))
+ command = ['ls', '-lR', containerDir]
+ logger.log_call(command)
+ logger.log("-TMP-vsys-status")
+ command = ['/usr/bin/systemctl', 'status', 'vsys']
+ 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: {} cleanly destroyed.'.format(name))
+ else:
+ # we're in /
+ #logger.log("-TMP-cwd {} : {}".format(name, os.getcwd()))
+ # also lsof never shows anything relevant; this is painful..
+ #logger.log("-TMP-lsof {}".format(name))
+ #command = ['lsof']
+ #logger.log_call(command)
+ logger.log("-TMP-ls-l {}".format(name))
+ command = ['ls', '-lR', containerDir]
+ logger.log_call(command)
+ logger.log("-TMP-lsof")
+ command = ['lsof']
+ logger.log_call(command)
+ if os.path.exists(containerDir):
+ logger.log('sliver_lxc.destroy: ERROR could not cleanly destroy {} - giving up'.format(name))
+ if vsys_stopped:
+ vsysStartService()
git://git.onelab.eu / nodemanager.git / blobdiff