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create_lxc.py
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create_lxc.py
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import subprocess
import sys
import time
import os, os.path
import grp, pwd
from pwd import getpwnam
from string import Template
import libvirt
import logger
import tools
import plnode.bwlimit as bwlimit
STATES = {
libvirt.VIR_DOMAIN_NOSTATE: 'no state',
libvirt.VIR_DOMAIN_RUNNING: 'running',
libvirt.VIR_DOMAIN_BLOCKED: 'blocked on resource',
libvirt.VIR_DOMAIN_PAUSED: 'paused by user',
libvirt.VIR_DOMAIN_SHUTDOWN: 'being shut down',
libvirt.VIR_DOMAIN_SHUTOFF: 'shut off',
libvirt.VIR_DOMAIN_CRASHED: 'crashed',
}
def get_interfaces_xml(rec):
xml = """
<interface type='network'>
<source network='default'/>
</interface>
"""
logger.log('create_lxc.py: interface XML is: %s' % xml)
return xml
def configure(name, rec):
"""Write <rec['keys']> to my authorized_keys file."""
logger.verbose('create_lxc: configuring %s'%name)
#new_keys = rec['keys']
# get the unix account info
gid = grp.getgrnam("slices")[2]
pw_info = pwd.getpwnam(name)
uid = pw_info[2]
pw_dir = pw_info[5]
# write out authorized_keys file and conditionally create
# the .ssh subdir if need be.
dot_ssh = os.path.join(pw_dir,'.ssh')
if not os.path.isdir(dot_ssh):
if not os.path.isdir(pw_dir):
logger.verbose('create_lxc: WARNING: homedir %s does not exist for %s!'%(pw_dir,name))
os.mkdir(pw_dir)
os.chown(pw_dir, uid, gid)
os.mkdir(dot_ssh)
auth_keys = os.path.join(dot_ssh,'authorized_keys')
for new_keys in rec['keys']:
tools.write_file(auth_keys, lambda f: f.write(new_keys['key']))
# set access permissions and ownership properly
os.chmod(dot_ssh, 0700)
os.chown(dot_ssh, uid, gid)
os.chmod(auth_keys, 0600)
os.chown(auth_keys, uid, gid)
logger.log('create_lxc: %s: installed ssh keys' % name)
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))