X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=sliver_lxc.py;h=96b757fe126349e49295ccb40ade0ee7f1185861;hb=4cb098f214296cbb28161fe8282e4040b5d07781;hp=4b7c956e46d1d030e0f6141c2502764d656a39d1;hpb=f2daae238f488de9e4f5acd5d946d17811fcca30;p=nodemanager.git diff --git a/sliver_lxc.py b/sliver_lxc.py index 4b7c956..96b757f 100644 --- a/sliver_lxc.py +++ b/sliver_lxc.py @@ -2,101 +2,252 @@ """LXC slivers""" -import accounts -import logger import subprocess -import os +import sys +import time +import os, os.path +import grp +from pwd import getpwnam +from string import Template + +import libvirt + +import logger +import plnode.bwlimit as bwlimit +from initscript import Initscript +from sliver_libvirt import Sliver_Libvirt -class Sliver_LXC(accounts.Account): +class Sliver_LXC(Sliver_Libvirt, Initscript): """This class wraps LXC commands""" - SHELL = '/bin/sh' - # Using /bin/bash triggers destroy root/site_admin destr + SHELL = '/usr/sbin/vsh' TYPE = 'sliver.LXC' # Need to add a tag at myplc to actually use this account # type = 'sliver.LXC' - def __init__(self, rec): - self.name = rec['name'] - print "LXC __init__ %s"%(self.name) - logger.verbose ('sliver_lxc: %s init'%self.name) - - self.dir = '/vservers/lxc_%s'%(self.name) - if not (os.path.isdir(self.dir) and - os.access(self.dir, os.R_OK | os.W_OK | os.X_OK)): - raise NoSuchVServer, "no such vserver: " + self.name - self.config = '/%s/config'%(self.dir) - self.fstab = '/%s/fstab'%(self.dir) - self.lxc_log = '/%s/lxc.log'%(self.dir) - self.keys = '' - self.rspec = {} - self.slice_id = rec['slice_id'] - self.disk_usage_initialized = False - self.initscript = '' - self.enabled = True - self.configure(rec) + 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() + 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): + def create(name, rec=None): ''' Create dirs, copy fs image, lxc_create ''' - print "LXC create %s"%(name) - logger.verbose ('sliver_lxc: %s create'%name) - dir = '/vservers/%s'%(name) - config = '%s/config'%(dir) - lxc_log = '%s/lxc.log'%(dir) - - if not (os.path.isdir(dir) and - os.access(dir, os.R_OK | os.W_OK | os.X_OK)): - print 'lxc_create: directory %s does not exist or wrong perms'%(dir) + logger.verbose ('sliver_lxc: %s create'%(name)) + conn = Sliver_Libvirt.getConnection(Sliver_LXC.TYPE) + + # 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-f14' % (name)) + vref = "lxc-f14-x86_64" + + 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 + + # 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('sliver_lxc: ERROR Could not create BTRFS snapshot at', containerDir) + return + command = ['chmod', '755', containerDir] + logger.log_call(command, timeout=15*60) + + # customize prompt for slice owner, + LD_PRELOAD for transparently wrap bind + dot_profile=os.path.join(containerDir,"root/.profile") + ld_preload_msg="""# 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""" + with open(dot_profile,'w') as f: + f.write("export PS1='%s@\H \$ '\n"%(name)) + f.write("%s\n"%ld_preload_msg) + f.write("export LD_PRELOAD=/etc/planetlab/lib/bind_public.so\n") + + # 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', 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) + + # 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') + if os.path.exists(etcpasswd): + logger.log("adding user %s id %d to %s" % (name, uid, etcpasswd)) + try: + file(etcpasswd,'a').write("%s:x:%d:%d::/home/%s:/bin/bash\n" % (name, uid, uid, name)) + except: + logger.log_exc("exception while updating etc/passwd") + 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") + + # 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(template_filename) as f: + template = Template(f.read()) + xml = template.substitute(name=name, interfaces=interfaces) + except IOError: + logger.log('Failed to parse or use XML template file %s'%template_filename) return - # Assume for now that the directory is there and with a FS - command=[] - # be verbose - command += ['/bin/bash','-x',] - command += ['/usr/bin/lxc-create', '-n', name, '-f', config, '&'] - print command - print subprocess.call(command, stdin=open('/dev/null', 'r'), stdout=open(lxc_log, 'a+'), stderr=subprocess.STDOUT, shell=False) - + + # 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, Sliver_Libvirt.debuginfo(dom))) + + @staticmethod def destroy(name): - ''' lxc_destroy ''' - print "LXC destroy %s"%(name) - dir = '/vservers/lxc_%s'%(name) - lxc_log = '%s/lxc.log'%(dir) - command=[] - # be verbose - command += ['/bin/bash','-x',] - command += ['/usr/bin/lxc-destroy', '-n', name] + logger.verbose ('sliver_lxc: %s destroy'%(name)) + conn = Sliver_Libvirt.getConnection(Sliver_LXC.TYPE) - subprocess.call(command, stdin=open('/dev/null', 'r'), stdout=open(lxc_log, 'a+'), stderr=subprocess.STDOUT, shell=False) - print "LXC destroy DONE" + containerDir = Sliver_LXC.CON_BASE_DIR + '/%s'%(name) - def configure(self, rec): - print "LXC configure %s"%(self.name) + try: + # Destroy libvirt domain + dom = conn.lookupByName(name) + except: + logger.verbose('sliver_lxc: Domain %s does not exist!' % name) + + try: + dom.destroy() + except: + logger.verbose('sliver_lxc: Domain %s not running... continuing.' % name) + + try: + dom.undefine() + except: + logger.verbose('sliver_lxc: 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) + + if os.path.exists(os.path.join(containerDir,"vsys")): + # Slivers with vsys running will fail the subvolume delete. + # A more permanent solution may be to ensure that the vsys module + # is called before the sliver is destroyed. + logger.log("destroying vsys directory and restarting vsys") + logger.log_call(["rm", "-fR", os.path.join(containerDir, "vsys")]) + logger.log_call(["/etc/init.d/vsys", "restart", ]) + + # Remove rootfs of destroyed domain + command = ['btrfs', 'subvolume', 'delete', containerDir] + logger.log_call(command, timeout=60) + + if os.path.exists(containerDir): + # oh no, it's still here... + logger.log("WARNING: failed to destroy container %s" % containerDir) + + logger.verbose('sliver_libvirt: %s destroyed.'%name) - def start(self, delay=0): - ''' Check existence? lxc_start ''' - print "LXC start %s"%(self.name) - command=[] - # be verbose - command += ['/bin/bash','-x',] - command += ['/usr/bin/lxc-start', '-n', self.name, '-d'] - print command - subprocess.call(command, stdin=open('/dev/null', 'r'), stdout=open(self.lxc_log, 'w+'), stderr=subprocess.STDOUT, shell=False) - - def stop(self): - ''' lxc_stop ''' - print "LXC stop %s"%(self.name) - - def is_running(self): - print "LXC is_running %s"%(self.name) - command = [] - command += ['/usr/bin/lxc-info -n %s'%(self.name)] - print command - p = subprocess.Popen(command, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True) - state = p.communicate()[0].split(' ')[2] - print state - if state == 'RUNNING': return True - else: return False - -