def stop(self):
logger.verbose('sliver_libvirt: {} stop'.format(self.name))
# Remove the ebtables rule before stopping
bwlimit.ebtables("-D INPUT -i veth{} -j mark --set-mark {}"
.format(self.xid, self.xid))
try:
self.dom.destroy()
except:
logger.log_exc("in sliver_libvirt.stop", name=self.name)
def start(self, delay=0):
'''Just start the sliver'''
logger.verbose('sliver_libvirt: {} start'.format(self.name))
# TD: Added OpenFlow rules to avoid OpenVSwitch-based slivers'
# auto-configuration issues when IPv6 auto-config and/or DHCP are
# available in the node's network. Sliver configuration is static.
if os.path.exists('/usr/bin/ovs-ofctl'):
logger.log('Adding OpenFlow rules to prevent IPv6 auto-config and DHCP in OpenVSwitch slivers')
# IPv6 ICMP Router Solicitation and Advertisement
logger.log_call([ '/usr/bin/ovs-ofctl', 'add-flow', 'public0', 'priority=100,icmp6,icmp_type=133,idle_timeout=0,hard_timeout=0,actions=drop' ])
logger.log_call([ '/usr/bin/ovs-ofctl', 'add-flow', 'public0', 'priority=100,icmp6,icmp_type=134,idle_timeout=0,hard_timeout=0,actions=drop' ])
# IPv4 DHCP
logger.log_call([ '/usr/bin/ovs-ofctl', 'add-flow', 'public0', 'priority=101,udp,nw_src=0.0.0.0,nw_dst=255.255.255.255,tp_src=68,tp_dst=67,idle_timeout=0,hard_timeout=0,actions=drop' ])
logger.log_call([ '/usr/bin/ovs-ofctl', 'add-flow', 'public0', 'priority=101,udp,tp_src=67,tp_dst=68,idle_timeout=0,hard_timeout=0,actions=drop' ])
else:
logger.log('NOTE: /usr/bin/ovs-ofctl not found!')
# Check if it's running to avoid throwing an exception if the
# domain was already running
if not self.is_running():
try:
# create actually means start
self.dom.create()
except Exception as e:
# XXX smbaker: attempt to resolve slivers that are stuck in
# "failed to allocate free veth".
if "ailed to allocate free veth" in str(e):
logger.log("failed to allocate free veth on {}".format(self.name))
self.repair_veth()
logger.log("trying dom.create again")
self.dom.create()
else:
raise
else:
logger.verbose('sliver_libvirt: sliver {} already started'.format(self.name))
# After the VM is started... we can play with the virtual interface
# Create the ebtables rule to mark the packets going out from the virtual
# interface to the actual device so the filter canmatch against the mark
bwlimit.ebtables("-A INPUT -i veth{} -j mark --set-mark {}"
.format(self.xid, self.xid))
# TD: Turn off SCTP checksum offloading. It is currently not working. FIXME: check for a kernel fix!
result = logger.log_call(['/usr/sbin/lxcsu', '-r', self.name, '--', '/usr/sbin/ethtool', '-K', 'eth0', 'tx-checksum-sctp', 'off'])
if not result:
logger.log('unable to apply SCTP checksum bug work-around for %s' % self.name)
# TD: Work-around for missing interface configuration: ensure that networking service is running.
result = logger.log_call(['/usr/sbin/lxcsu', '-r', self.name, '/sbin/service', 'network', 'restart'])
if not result:
logger.log('unable to restart networking service for %s' % self.name)
def stop(self):
logger.verbose('sliver_libvirt: %s stop'%(self.name))
# Remove the ebtables rule before stopping
bwlimit.ebtables("-D INPUT -i veth%d -j mark --set-mark %d" % \
(self.xid, self.xid))
try:
self.dom.destroy()
except:
logger.verbose('sliver_libvirt: Domain %s not running ' \
'UNEXPECTED: %s'%(self.name, sys.exc_info()[1]))
print 'sliver_libvirt: Domain %s not running ' \
'UNEXPECTED: %s'%(self.name, sys.exc_info()[1])
def start(self, delay=0):
''' Just start the sliver '''
logger.verbose('sliver_libvirt: %s start'%(self.name))
# Check if it's running to avoid throwing an exception if the
# domain was already running, create actually means start
if not self.is_running():
self.dom.create()
else:
logger.verbose('sliver_libvirt: sliver %s already started'%(self.name))
# After the VM is started... we can play with the virtual interface
# Create the ebtables rule to mark the packets going out from the virtual
# interface to the actual device so the filter canmatch against the mark
bwlimit.ebtables("-A INPUT -i veth%d -j mark --set-mark %d" % \
(self.xid, self.xid))
def create_lxc(name, rec=None):
''' Create dirs, copy fs image, creat_lxc '''
logger.verbose ('sliver_lxc: %s create'%(name))
conn = libvirt.open("lxc://")
try:
p = conn.lookupByName(name)
logger.log("create_lxc: there is already a running vm %s!"%(name))
return
except:
logger.log("create a new sliver %s"%(name))
#return
# Get the type of image from vref myplc tags specified as:
# pldistro = lxc
# fcdistro = squeeze
# arch x86_64
arch = 'x86_64'
#tags = rec['rspec']['tags']
#if 'arch' in tags:
# arch = tags['arch']
# if arch == 'i386':
# arch = 'i686'
vref = "lxc-f18-x86_64"
#vref = rec['vref']
#if vref is None:
# vref = "lxc-f14-x86_64"
# logger.log("sliver_libvirt: %s: WARNING - no vref attached, using hard-wired default %s" % (name,vref))
refImgDir = os.path.join('/vservers/.lvref', vref)
containerDir = os.path.join('/vservers', name)
# check the template exists -- there's probably a better way..
if not os.path.isdir(refImgDir):
logger.log('creat_lxc: %s: ERROR Could not create sliver - reference image %s not found' % (name,vref))
logger.log('creat_lxc: %s: ERROR Expected reference image in %s'%(name,refImgDir))
return
# Snapshot the reference image fs (assume the reference image is in its own
# subvolume)
command = ['btrfs', 'subvolume', 'snapshot', refImgDir, containerDir]
if not logger.log_call(command, timeout=15*60):
logger.log('creat_lxc: ERROR Could not create BTRFS snapshot at', containerDir)
return
command = ['chmod', '755', containerDir]
logger.log_call(command, timeout=15*60)
# 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('_', '-')
# Add slices group if not already present
try:
group = grp.getgrnam('slices')
except:
command = ['/usr/sbin/groupadd', 'slices']
logger.log_call(command, timeout=15*60)
# Add unix account (TYPE is specified in the subclass)
command = ['/usr/sbin/useradd', '-g', 'slices', '-s', '/usr/sbin/vsh', name, '-p', '*']
logger.log_call(command, timeout=15*60)
command = ['mkdir', '/home/%s/.ssh'%name]
logger.log_call(command, timeout=15*60)
# 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=60)
command = ['chown', '-R', '%s.slices'%name, '/home/%s/.ssh'%name]
logger.log_call(command, timeout=30)
command = ['mkdir', '%s/root/.ssh'%containerDir]
logger.log_call(command, timeout=10)
command = ['cp', '/home/%s/.ssh/id_rsa.pub'%name, '%s/root/.ssh/authorized_keys'%containerDir]
logger.log_call(command, timeout=30)
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, timeout=10)
command = ['chown', name, '%s/home/%s' % (containerDir, name)]
logger.log_call(command, timeout=10)
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,timeout=5)
# 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('/vservers/.lvref','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 = 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 %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)
def debuginfo(dom):
''' Helper method to get a "nice" output of the info struct for debug'''
[state, maxmem, mem, ncpu, cputime] = dom.info()
return '%s is %s, maxmem = %s, mem = %s, ncpu = %s, cputime = %s' % (dom.name(), STATES.get(state, state), maxmem, mem, ncpu, cputime)
logger.verbose('create_lxc: %s -> %s'%(name, debuginfo(dom)))
# the sliver has been created
# then configure the sliver, write keys to authorized_keys file
configure(name, rec)
# finally, start the sliver
dom.create()
logger.verbose('create_lxc:%s start'%(name))
# After the VM is started... we can play with the virtual interface
# Create the ebtables rule to mark the packets going out from the virtual
# interface to the actual device so the filter canmatch against the mark
bwlimit.ebtables("-A INPUT -i veth%d -j mark --set-mark %d" % \
(xid, xid))
def create_lxc(name, rec=None):
''' Create dirs, copy fs image, creat_lxc '''
logger.verbose('sliver_lxc: %s create' % (name))
conn = libvirt.open("lxc://")
try:
p = conn.lookupByName(name)
logger.log("create_lxc: there is already a running vm %s!" % (name))
return
except:
logger.log("create a new sliver %s" % (name))
#return
# Get the type of image from vref myplc tags specified as:
# pldistro = lxc
# fcdistro = squeeze
# arch x86_64
arch = 'x86_64'
#tags = rec['rspec']['tags']
#if 'arch' in tags:
# arch = tags['arch']
# if arch == 'i386':
# arch = 'i686'
vref = "lxc-f18-x86_64"
#vref = rec['vref']
#if vref is None:
# vref = "lxc-f14-x86_64"
# logger.log("sliver_libvirt: %s: WARNING - no vref attached, using hard-wired default %s" % (name,vref))
refImgDir = os.path.join('/vservers/.lvref', vref)
containerDir = os.path.join('/vservers', name)
# check the template exists -- there's probably a better way..
if not os.path.isdir(refImgDir):
logger.log(
'creat_lxc: %s: ERROR Could not create sliver - reference image %s not found'
% (name, vref))
logger.log('creat_lxc: %s: ERROR Expected reference image in %s' %
(name, refImgDir))
return
# Snapshot the reference image fs (assume the reference image is in its own
# subvolume)
command = ['btrfs', 'subvolume', 'snapshot', refImgDir, containerDir]
if not logger.log_call(command, timeout=15 * 60):
logger.log('creat_lxc: ERROR Could not create BTRFS snapshot at',
containerDir)
return
command = ['chmod', '755', containerDir]
logger.log_call(command, timeout=15 * 60)
# 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('_', '-')
# Add slices group if not already present
try:
group = grp.getgrnam('slices')
except:
command = ['/usr/sbin/groupadd', 'slices']
logger.log_call(command, timeout=15 * 60)
# Add unix account (TYPE is specified in the subclass)
command = [
'/usr/sbin/useradd', '-g', 'slices', '-s', '/usr/sbin/vsh', name, '-p',
'*'
]
logger.log_call(command, timeout=15 * 60)
command = ['mkdir', '/home/%s/.ssh' % name]
logger.log_call(command, timeout=15 * 60)
# 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=60)
command = ['chown', '-R', '%s.slices' % name, '/home/%s/.ssh' % name]
logger.log_call(command, timeout=30)
command = ['mkdir', '%s/root/.ssh' % containerDir]
logger.log_call(command, timeout=10)
command = [
'cp',
'/home/%s/.ssh/id_rsa.pub' % name,
'%s/root/.ssh/authorized_keys' % containerDir
]
logger.log_call(command, timeout=30)
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, timeout=10)
command = ['chown', name, '%s/home/%s' % (containerDir, name)]
logger.log_call(command, timeout=10)
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, timeout=5)
# 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('/vservers/.lvref',
'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 = 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 %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)
def debuginfo(dom):
''' Helper method to get a "nice" output of the info struct for debug'''
[state, maxmem, mem, ncpu, cputime] = dom.info()
return '%s is %s, maxmem = %s, mem = %s, ncpu = %s, cputime = %s' % (
dom.name(), STATES.get(state, state), maxmem, mem, ncpu, cputime)
logger.verbose('create_lxc: %s -> %s' % (name, debuginfo(dom)))
# the sliver has been created
# then configure the sliver, write keys to authorized_keys file
configure(name, rec)
# finally, start the sliver
dom.create()
logger.verbose('create_lxc:%s start' % (name))
# After the VM is started... we can play with the virtual interface
# Create the ebtables rule to mark the packets going out from the virtual
# interface to the actual device so the filter canmatch against the mark
bwlimit.ebtables("-A INPUT -i veth%d -j mark --set-mark %d" % \
(xid, xid))
