- This class contains a few bits of common functionality between the
- 0.7 and 8.x versions of DRBD.
-
- """
- _VERSION_RE = re.compile(r"^version: (\d+)\.(\d+)\.(\d+)"
- r" \(api:(\d+)/proto:(\d+)(?:-(\d+))?\)")
-
- _DRBD_MAJOR = 147
- _ST_UNCONFIGURED = "Unconfigured"
- _ST_WFCONNECTION = "WFConnection"
- _ST_CONNECTED = "Connected"
-
- @staticmethod
- def _GetProcData():
- """Return data from /proc/drbd.
-
- """
- stat = open("/proc/drbd", "r")
- try:
- data = stat.read().splitlines()
- finally:
- stat.close()
- if not data:
- raise errors.BlockDeviceError("Can't read any data from /proc/drbd")
- return data
-
- @staticmethod
- def _MassageProcData(data):
- """Transform the output of _GetProdData into a nicer form.
-
- Returns:
- a dictionary of minor: joined lines from /proc/drbd for that minor
-
- """
- lmatch = re.compile("^ *([0-9]+):.*$")
- results = {}
- old_minor = old_line = None
- for line in data:
- lresult = lmatch.match(line)
- if lresult is not None:
- if old_minor is not None:
- results[old_minor] = old_line
- old_minor = int(lresult.group(1))
- old_line = line
- else:
- if old_minor is not None:
- old_line += " " + line.strip()
- # add last line
- if old_minor is not None:
- results[old_minor] = old_line
- return results
-
- @classmethod
- def _GetVersion(cls):
- """Return the DRBD version.
-
- This will return a dict with keys:
- k_major,
- k_minor,
- k_point,
- api,
- proto,
- proto2 (only on drbd > 8.2.X)
-
- """
- proc_data = cls._GetProcData()
- first_line = proc_data[0].strip()
- version = cls._VERSION_RE.match(first_line)
- if not version:
- raise errors.BlockDeviceError("Can't parse DRBD version from '%s'" %
- first_line)
-
- values = version.groups()
- retval = {'k_major': int(values[0]),
- 'k_minor': int(values[1]),
- 'k_point': int(values[2]),
- 'api': int(values[3]),
- 'proto': int(values[4]),
- }
- if values[5] is not None:
- retval['proto2'] = values[5]
-
- return retval
-
- @staticmethod
- def _DevPath(minor):
- """Return the path to a drbd device for a given minor.
-
- """
- return "/dev/drbd%d" % minor
-
- @classmethod
- def _GetUsedDevs(cls):
- """Compute the list of used DRBD devices.
-
- """
- data = cls._GetProcData()
-
- used_devs = {}
- valid_line = re.compile("^ *([0-9]+): cs:([^ ]+).*$")
- for line in data:
- match = valid_line.match(line)
- if not match:
- continue
- minor = int(match.group(1))
- state = match.group(2)
- if state == cls._ST_UNCONFIGURED:
- continue
- used_devs[minor] = state, line
-
- return used_devs
-
- def _SetFromMinor(self, minor):
- """Set our parameters based on the given minor.
-
- This sets our minor variable and our dev_path.
-
- """
- if minor is None:
- self.minor = self.dev_path = None
- else:
- self.minor = minor
- self.dev_path = self._DevPath(minor)
-
- @staticmethod
- def _CheckMetaSize(meta_device):
- """Check if the given meta device looks like a valid one.
-
- This currently only check the size, which must be around
- 128MiB.
-
- """
- result = utils.RunCmd(["blockdev", "--getsize", meta_device])
- if result.failed:
- logger.Error("Failed to get device size: %s - %s" %
- (result.fail_reason, result.output))
- return False
- try:
- sectors = int(result.stdout)
- except ValueError:
- logger.Error("Invalid output from blockdev: '%s'" % result.stdout)
- return False
- bytes = sectors * 512
- if bytes < 128 * 1024 * 1024: # less than 128MiB
- logger.Error("Meta device too small (%.2fMib)" % (bytes / 1024 / 1024))
- return False
- if bytes > (128 + 32) * 1024 * 1024: # account for an extra (big) PE on LVM
- logger.Error("Meta device too big (%.2fMiB)" % (bytes / 1024 / 1024))
- return False
- return True
-
- def Rename(self, new_id):
- """Rename a device.
-
- This is not supported for drbd devices.
-
- """
- raise errors.ProgrammerError("Can't rename a drbd device")
-
-
-class DRBDev(BaseDRBD):
- """DRBD block device.
-
- This implements the local host part of the DRBD device, i.e. it
- doesn't do anything to the supposed peer. If you need a fully
- connected DRBD pair, you need to use this class on both hosts.
-
- The unique_id for the drbd device is the (local_ip, local_port,
- remote_ip, remote_port) tuple, and it must have two children: the
- data device and the meta_device. The meta device is checked for
- valid size and is zeroed on create.
-
- """
- def __init__(self, unique_id, children):
- super(DRBDev, self).__init__(unique_id, children)
- self.major = self._DRBD_MAJOR
- version = self._GetVersion()
- if version['k_major'] != 0 and version['k_minor'] != 7:
- raise errors.BlockDeviceError("Mismatch in DRBD kernel version and"
- " requested ganeti usage: kernel is"
- " %s.%s, ganeti wants 0.7" %
- (version['k_major'], version['k_minor']))
- if len(children) != 2:
- raise ValueError("Invalid configuration data %s" % str(children))
- if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 4:
- raise ValueError("Invalid configuration data %s" % str(unique_id))
- self._lhost, self._lport, self._rhost, self._rport = unique_id
- self.Attach()
-
- @classmethod
- def _FindUnusedMinor(cls):
- """Find an unused DRBD device.
-
- """
- data = cls._GetProcData()
-
- valid_line = re.compile("^ *([0-9]+): cs:Unconfigured$")
- for line in data:
- match = valid_line.match(line)
- if match:
- return int(match.group(1))
- logger.Error("Error: no free drbd minors!")
- raise errors.BlockDeviceError("Can't find a free DRBD minor")
-
- @classmethod
- def _GetDevInfo(cls, minor):
- """Get details about a given DRBD minor.
-
- This return, if available, the local backing device in (major,
- minor) formant and the local and remote (ip, port) information.
-
- """
- data = {}
- result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "show"])
- if result.failed:
- logger.Error("Can't display the drbd config: %s - %s" %
- (result.fail_reason, result.output))
- return data
- out = result.stdout
- if out == "Not configured\n":
- return data
- for line in out.splitlines():
- if "local_dev" not in data:
- match = re.match("^Lower device: ([0-9]+):([0-9]+) .*$", line)
- if match:
- data["local_dev"] = (int(match.group(1)), int(match.group(2)))
- continue
- if "meta_dev" not in data:
- match = re.match("^Meta device: (([0-9]+):([0-9]+)|internal).*$", line)
- if match:
- if match.group(2) is not None and match.group(3) is not None:
- # matched on the major/minor
- data["meta_dev"] = (int(match.group(2)), int(match.group(3)))
- else:
- # matched on the "internal" string
- data["meta_dev"] = match.group(1)
- # in this case, no meta_index is in the output
- data["meta_index"] = -1
- continue
- if "meta_index" not in data:
- match = re.match("^Meta index: ([0-9]+).*$", line)
- if match:
- data["meta_index"] = int(match.group(1))
- continue
- if "local_addr" not in data:
- match = re.match("^Local address: ([0-9.]+):([0-9]+)$", line)
- if match:
- data["local_addr"] = (match.group(1), int(match.group(2)))
- continue
- if "remote_addr" not in data:
- match = re.match("^Remote address: ([0-9.]+):([0-9]+)$", line)
- if match:
- data["remote_addr"] = (match.group(1), int(match.group(2)))
- continue
- return data
-
- def _MatchesLocal(self, info):
- """Test if our local config matches with an existing device.
-
- The parameter should be as returned from `_GetDevInfo()`. This
- method tests if our local backing device is the same as the one in
- the info parameter, in effect testing if we look like the given
- device.
-
- """
- if not ("local_dev" in info and "meta_dev" in info and
- "meta_index" in info):
- return False
-
- backend = self._children[0]
- if backend is not None:
- retval = (info["local_dev"] == (backend.major, backend.minor))
- else:
- retval = (info["local_dev"] == (0, 0))
- meta = self._children[1]
- if meta is not None:
- retval = retval and (info["meta_dev"] == (meta.major, meta.minor))
- retval = retval and (info["meta_index"] == 0)
- else:
- retval = retval and (info["meta_dev"] == "internal" and
- info["meta_index"] == -1)
- return retval
-
- def _MatchesNet(self, info):
- """Test if our network config matches with an existing device.
-
- The parameter should be as returned from `_GetDevInfo()`. This
- method tests if our network configuration is the same as the one
- in the info parameter, in effect testing if we look like the given
- device.
-
- """
- if (((self._lhost is None and not ("local_addr" in info)) and
- (self._rhost is None and not ("remote_addr" in info)))):
- return True
-
- if self._lhost is None:
- return False
-
- if not ("local_addr" in info and
- "remote_addr" in info):
- return False
-
- retval = (info["local_addr"] == (self._lhost, self._lport))
- retval = (retval and
- info["remote_addr"] == (self._rhost, self._rport))
- return retval
-
- @classmethod
- def _AssembleLocal(cls, minor, backend, meta):
- """Configure the local part of a DRBD device.
-
- This is the first thing that must be done on an unconfigured DRBD
- device. And it must be done only once.
-
- """
- if not cls._CheckMetaSize(meta):
- return False
- result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "disk",
- backend, meta, "0", "-e", "detach"])
- if result.failed:
- logger.Error("Can't attach local disk: %s" % result.output)
- return not result.failed
-
- @classmethod
- def _ShutdownLocal(cls, minor):
- """Detach from the local device.
-
- I/Os will continue to be served from the remote device. If we
- don't have a remote device, this operation will fail.
-
- """
- result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "detach"])
- if result.failed:
- logger.Error("Can't detach local device: %s" % result.output)
- return not result.failed
-
- @staticmethod
- def _ShutdownAll(minor):
- """Deactivate the device.
-
- This will, of course, fail if the device is in use.
-
- """
- result = utils.RunCmd(["drbdsetup", DRBDev._DevPath(minor), "down"])
- if result.failed:
- logger.Error("Can't shutdown drbd device: %s" % result.output)
- return not result.failed
-
- @classmethod
- def _AssembleNet(cls, minor, net_info, protocol):
- """Configure the network part of the device.
-
- This operation can be, in theory, done multiple times, but there
- have been cases (in lab testing) in which the network part of the
- device had become stuck and couldn't be shut down because activity
- from the new peer (also stuck) triggered a timer re-init and
- needed remote peer interface shutdown in order to clear. So please
- don't change online the net config.
-
- """
- lhost, lport, rhost, rport = net_info
- result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "net",
- "%s:%s" % (lhost, lport), "%s:%s" % (rhost, rport),
- protocol])
- if result.failed:
- logger.Error("Can't setup network for dbrd device: %s - %s" %
- (result.fail_reason, result.output))
- return False
-
- timeout = time.time() + 10
- ok = False
- while time.time() < timeout:
- info = cls._GetDevInfo(minor)
- if not "local_addr" in info or not "remote_addr" in info:
- time.sleep(1)
- continue
- if (info["local_addr"] != (lhost, lport) or
- info["remote_addr"] != (rhost, rport)):
- time.sleep(1)
- continue
- ok = True
- break
- if not ok:
- logger.Error("Timeout while configuring network")
- return False
- return True
-
- @classmethod
- def _ShutdownNet(cls, minor):
- """Disconnect from the remote peer.
-
- This fails if we don't have a local device.
-
- """
- result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "disconnect"])
- if result.failed:
- logger.Error("Can't shutdown network: %s" % result.output)
- return not result.failed
-
- def Assemble(self):
- """Assemble the drbd.
-
- Method:
- - if we have a local backing device, we bind to it by:
- - checking the list of used drbd devices
- - check if the local minor use of any of them is our own device
- - if yes, abort?
- - if not, bind
- - if we have a local/remote net info:
- - redo the local backing device step for the remote device
- - check if any drbd device is using the local port,
- if yes abort
- - check if any remote drbd device is using the remote
- port, if yes abort (for now)
- - bind our net port
- - bind the remote net port
-
- """
- self.Attach()
- if self.minor is not None:
- logger.Info("Already assembled")
- return True
-
- result = super(DRBDev, self).Assemble()
- if not result:
- return result
-
- minor = self._FindUnusedMinor()
- need_localdev_teardown = False
- if self._children[0]:
- result = self._AssembleLocal(minor, self._children[0].dev_path,
- self._children[1].dev_path)
- if not result:
- return False
- need_localdev_teardown = True
- if self._lhost and self._lport and self._rhost and self._rport:
- result = self._AssembleNet(minor,
- (self._lhost, self._lport,
- self._rhost, self._rport),
- "C")
- if not result:
- if need_localdev_teardown:
- # we will ignore failures from this
- logger.Error("net setup failed, tearing down local device")
- self._ShutdownAll(minor)
- return False
- self._SetFromMinor(minor)
- return True
-
- def Shutdown(self):
- """Shutdown the DRBD device.
projects / ganeti-local / blobdiff