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# Copyright (C) 2006, 2007, 2008, 2009 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Chroot manager hypervisor
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"""
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import os
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import os.path
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import time
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import logging
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from cStringIO import StringIO
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from ganeti import constants
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from ganeti import errors
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from ganeti import utils
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from ganeti.hypervisor import hv_base
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from ganeti.errors import HypervisorError
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class ChrootManager(hv_base.BaseHypervisor):
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"""Chroot manager.
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This not-really hypervisor allows ganeti to manage chroots. It has
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special behaviour and requirements on the OS definition and the node
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environemnt:
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- the start and stop of the chroot environment are done via a
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script called ganeti-chroot located in the root directory of the
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first drive, which should be created by the OS definition
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- this script must accept the start and stop argument and, on
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shutdown, it should cleanly shutdown the daemons/processes
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using the chroot
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- the daemons run in chroot should only bind to the instance IP
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(to which the OS create script has access via the instance name)
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- since some daemons in the node could be listening on the wildcard
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address, some ports might be unavailable
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- the instance listing will show no memory usage
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- on shutdown, the chroot manager will try to find all mountpoints
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under the root dir of the instance and unmount them
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- instance alive check is based on whether any process is using the chroot
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"""
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_ROOT_DIR = constants.RUN_GANETI_DIR + "/chroot-hypervisor"
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PARAMETERS = [
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constants.HV_INIT_SCRIPT,
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]
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def __init__(self):
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hv_base.BaseHypervisor.__init__(self)
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if not os.path.exists(self._ROOT_DIR):
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os.mkdir(self._ROOT_DIR)
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if not os.path.isdir(self._ROOT_DIR):
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raise HypervisorError("Needed path %s is not a directory" %
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self._ROOT_DIR)
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@staticmethod
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def _IsDirLive(path):
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"""Check if a directory looks like a live chroot.
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"""
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if not os.path.ismount(path):
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return False
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result = utils.RunCmd(["fuser", "-m", path])
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return not result.failed
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@staticmethod
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def _GetMountSubdirs(path):
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"""Return the list of mountpoints under a given path.
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This function is Linux-specific.
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"""
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#TODO(iustin): investigate and document non-linux options
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#(e.g. via mount output)
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data = []
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fh = open("/proc/mounts", "r")
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try:
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for line in fh:
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fstype, mountpoint, rest = line.split(" ", 2)
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if (mountpoint.startswith(path) and
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mountpoint != path):
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data.append(mountpoint)
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finally:
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fh.close()
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data.sort(key=lambda x: x.count("/"), reverse=True)
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return data
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def ListInstances(self):
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"""Get the list of running instances.
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"""
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return [name for name in os.listdir(self._ROOT_DIR)
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if self._IsDirLive(os.path.join(self._ROOT_DIR, name))]
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def GetInstanceInfo(self, instance_name):
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"""Get instance properties.
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Args:
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instance_name: the instance name
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Returns:
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(name, id, memory, vcpus, stat, times)
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"""
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dir_name = "%s/%s" % (self._ROOT_DIR, instance_name)
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if not self._IsDirLive(dir_name):
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raise HypervisorError("Instance %s is not running" % instance_name)
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return (instance_name, 0, 0, 0, 0, 0)
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def GetAllInstancesInfo(self):
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"""Get properties of all instances.
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Returns:
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[(name, id, memory, vcpus, stat, times),...]
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"""
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data = []
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for file_name in os.listdir(self._ROOT_DIR):
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path = os.path.join(self._ROOT_DIR, file_name)
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if self._IsDirLive(path):
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data.append((file_name, 0, 0, 0, 0, 0))
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return data
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def StartInstance(self, instance, block_devices):
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"""Start an instance.
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For the chroot manager, we try to mount the block device and
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execute '/ganeti-chroot start'.
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"""
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root_dir = "%s/%s" % (self._ROOT_DIR, instance.name)
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if not os.path.exists(root_dir):
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try:
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os.mkdir(root_dir)
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except IOError, err:
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raise HypervisorError("Failed to start instance %s: %s" %
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(instance.name, err))
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if not os.path.isdir(root_dir):
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raise HypervisorError("Needed path %s is not a directory" % root_dir)
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if not os.path.ismount(root_dir):
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if not block_devices:
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raise HypervisorError("The chroot manager needs at least one disk")
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sda_dev_path = block_devices[0][1]
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result = utils.RunCmd(["mount", sda_dev_path, root_dir])
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if result.failed:
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raise HypervisorError("Can't mount the chroot dir: %s" % result.output)
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init_script = instance.hvparams[constants.HV_INIT_SCRIPT]
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result = utils.RunCmd(["chroot", root_dir, init_script, "start"])
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if result.failed:
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raise HypervisorError("Can't run the chroot start script: %s" %
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result.output)
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def StopInstance(self, instance, force=False):
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"""Stop an instance.
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This method has complicated cleanup tests, as we must:
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- try to kill all leftover processes
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- try to unmount any additional sub-mountpoints
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- finally unmount the instance dir
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"""
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root_dir = "%s/%s" % (self._ROOT_DIR, instance.name)
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if not os.path.exists(root_dir):
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return
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if self._IsDirLive(root_dir):
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result = utils.RunCmd(["chroot", root_dir, "/ganeti-chroot", "stop"])
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if result.failed:
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raise HypervisorError("Can't run the chroot stop script: %s" %
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result.output)
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retry = 20
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while not force and self._IsDirLive(root_dir) and retry > 0:
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time.sleep(1)
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retry -= 1
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if retry < 10:
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result = utils.RunCmd(["fuser", "-k", "-TERM", "-m", root_dir])
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retry = 5
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while force and self._IsDirLive(root_dir) and retry > 0:
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time.sleep(1)
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retry -= 1
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utils.RunCmd(["fuser", "-k", "-KILL", "-m", root_dir])
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if self._IsDirLive(root_dir):
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raise HypervisorError("Can't stop the processes using the chroot")
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for mpath in self._GetMountSubdirs(root_dir):
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utils.RunCmd(["umount", mpath])
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retry = 10
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while retry > 0:
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result = utils.RunCmd(["umount", root_dir])
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if not result.failed:
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break
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retry -= 1
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time.sleep(1)
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if result.failed:
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logging.error("Processes still alive in the chroot: %s",
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utils.RunCmd("fuser -vm %s" % root_dir).output)
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raise HypervisorError("Can't umount the chroot dir: %s" % result.output)
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def RebootInstance(self, instance):
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"""Reboot an instance.
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This is not (yet) implemented for the chroot manager.
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"""
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raise HypervisorError("The chroot manager doesn't implement the"
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" reboot functionality")
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def GetNodeInfo(self):
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"""Return information about the node.
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This is just a wrapper over the base GetLinuxNodeInfo method.
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@return: a dict with the following keys (values in MiB):
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- memory_total: the total memory size on the node
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- memory_free: the available memory on the node for instances
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- memory_dom0: the memory used by the node itself, if available
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"""
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return self.GetLinuxNodeInfo()
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@classmethod
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def GetShellCommandForConsole(cls, instance, hvparams, beparams):
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"""Return a command for connecting to the console of an instance.
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"""
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root_dir = "%s/%s" % (cls._ROOT_DIR, instance.name)
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if not os.path.ismount(root_dir):
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raise HypervisorError("Instance %s is not running" % instance.name)
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return "chroot %s" % root_dir
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def Verify(self):
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"""Verify the hypervisor.
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For the chroot manager, it just checks the existence of the base
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dir.
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"""
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if not os.path.exists(self._ROOT_DIR):
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return "The required directory '%s' does not exist." % self._ROOT_DIR
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