root / lib / config.py @ 7e3dbb94
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# Copyright (C) 2006, 2007 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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"""Configuration management for Ganeti
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This module provides the interface to the Ganeti cluster configuration.
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The configuration data is stored on every node but is updated on the master
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only. After each update, the master distributes the data to the other nodes.
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Currently, the data storage format is JSON. YAML was slow and consuming too
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much memory.
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"""
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import os |
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import tempfile |
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import random |
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from ganeti import errors |
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from ganeti import logger |
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from ganeti import utils |
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from ganeti import constants |
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from ganeti import rpc |
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from ganeti import objects |
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class ConfigWriter: |
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"""The interface to the cluster configuration.
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"""
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def __init__(self, cfg_file=None, offline=False): |
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self.write_count = 0 |
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self._config_data = None |
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self._config_time = None |
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self._config_size = None |
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self._config_inode = None |
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self._offline = offline
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if cfg_file is None: |
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self._cfg_file = constants.CLUSTER_CONF_FILE
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else:
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self._cfg_file = cfg_file
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self._temporary_ids = set() |
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# Note: in order to prevent errors when resolving our name in
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# _DistributeConfig, we compute it here once and reuse it; it's
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# better to raise an error before starting to modify the config
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# file than after it was modified
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self._my_hostname = utils.HostInfo().name
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# this method needs to be static, so that we can call it on the class
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@staticmethod
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def IsCluster(): |
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"""Check if the cluster is configured.
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"""
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return os.path.exists(constants.CLUSTER_CONF_FILE)
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def GenerateMAC(self): |
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"""Generate a MAC for an instance.
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This should check the current instances for duplicates.
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"""
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self._OpenConfig()
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self._ReleaseLock()
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prefix = self._config_data.cluster.mac_prefix
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all_macs = self._AllMACs()
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retries = 64
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while retries > 0: |
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byte1 = random.randrange(0, 256) |
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byte2 = random.randrange(0, 256) |
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byte3 = random.randrange(0, 256) |
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mac = "%s:%02x:%02x:%02x" % (prefix, byte1, byte2, byte3)
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if mac not in all_macs: |
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break
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retries -= 1
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else:
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raise errors.ConfigurationError("Can't generate unique MAC") |
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return mac
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def _ComputeAllLVs(self): |
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"""Compute the list of all LVs.
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"""
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self._OpenConfig()
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self._ReleaseLock()
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lvnames = set()
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for instance in self._config_data.instances.values(): |
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node_data = instance.MapLVsByNode() |
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for lv_list in node_data.values(): |
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lvnames.update(lv_list) |
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return lvnames
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def GenerateUniqueID(self, exceptions=None): |
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"""Generate an unique disk name.
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This checks the current node, instances and disk names for
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duplicates.
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Args:
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- exceptions: a list with some other names which should be checked
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for uniqueness (used for example when you want to get
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more than one id at one time without adding each one in
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turn to the config file
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Returns: the unique id as a string
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"""
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existing = set()
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existing.update(self._temporary_ids)
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existing.update(self._ComputeAllLVs())
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existing.update(self._config_data.instances.keys())
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existing.update(self._config_data.nodes.keys())
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if exceptions is not None: |
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existing.update(exceptions) |
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retries = 64
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while retries > 0: |
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unique_id = utils.NewUUID() |
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if unique_id not in existing and unique_id is not None: |
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break
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else:
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raise errors.ConfigurationError("Not able generate an unique ID" |
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" (last tried ID: %s" % unique_id)
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self._temporary_ids.add(unique_id)
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return unique_id
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def _AllMACs(self): |
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"""Return all MACs present in the config.
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"""
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self._OpenConfig()
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self._ReleaseLock()
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result = [] |
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for instance in self._config_data.instances.values(): |
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for nic in instance.nics: |
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result.append(nic.mac) |
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return result
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def VerifyConfig(self): |
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"""Stub verify function.
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"""
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self._OpenConfig()
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self._ReleaseLock()
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result = [] |
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seen_macs = [] |
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data = self._config_data
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for instance_name in data.instances: |
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instance = data.instances[instance_name] |
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if instance.primary_node not in data.nodes: |
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result.append("Instance '%s' has invalid primary node '%s'" %
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(instance_name, instance.primary_node)) |
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for snode in instance.secondary_nodes: |
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if snode not in data.nodes: |
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result.append("Instance '%s' has invalid secondary node '%s'" %
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(instance_name, snode)) |
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for idx, nic in enumerate(instance.nics): |
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if nic.mac in seen_macs: |
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result.append("Instance '%s' has NIC %d mac %s duplicate" %
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(instance_name, idx, nic.mac)) |
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else:
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seen_macs.append(nic.mac) |
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return result
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def SetDiskID(self, disk, node_name): |
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"""Convert the unique ID to the ID needed on the target nodes.
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This is used only for drbd, which needs ip/port configuration.
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The routine descends down and updates its children also, because
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this helps when the only the top device is passed to the remote
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node.
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"""
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if disk.children:
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for child in disk.children: |
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self.SetDiskID(child, node_name)
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if disk.logical_id is None and disk.physical_id is not None: |
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return
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if disk.dev_type in constants.LDS_DRBD: |
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pnode, snode, port = disk.logical_id |
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if node_name not in (pnode, snode): |
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raise errors.ConfigurationError("DRBD device not knowing node %s" % |
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node_name) |
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pnode_info = self.GetNodeInfo(pnode)
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snode_info = self.GetNodeInfo(snode)
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if pnode_info is None or snode_info is None: |
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raise errors.ConfigurationError("Can't find primary or secondary node" |
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" for %s" % str(disk)) |
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if pnode == node_name:
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disk.physical_id = (pnode_info.secondary_ip, port, |
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snode_info.secondary_ip, port) |
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else: # it must be secondary, we tested above |
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disk.physical_id = (snode_info.secondary_ip, port, |
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pnode_info.secondary_ip, port) |
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else:
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disk.physical_id = disk.logical_id |
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return
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def AddTcpUdpPort(self, port): |
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"""Adds a new port to the available port pool.
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"""
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if not isinstance(port, int): |
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raise errors.ProgrammerError("Invalid type passed for port") |
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self._OpenConfig()
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self._config_data.cluster.tcpudp_port_pool.add(port)
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self._WriteConfig()
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def GetPortList(self): |
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"""Returns a copy of the current port list.
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"""
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self._OpenConfig()
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self._ReleaseLock()
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return self._config_data.cluster.tcpudp_port_pool.copy() |
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def AllocatePort(self): |
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"""Allocate a port.
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The port will be taken from the available port pool or from the
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default port range (and in this case we increase
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highest_used_port).
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"""
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self._OpenConfig()
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# If there are TCP/IP ports configured, we use them first.
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if self._config_data.cluster.tcpudp_port_pool: |
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port = self._config_data.cluster.tcpudp_port_pool.pop()
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else:
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port = self._config_data.cluster.highest_used_port + 1 |
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if port >= constants.LAST_DRBD_PORT:
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raise errors.ConfigurationError("The highest used port is greater" |
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" than %s. Aborting." %
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constants.LAST_DRBD_PORT) |
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self._config_data.cluster.highest_used_port = port
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self._WriteConfig()
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return port
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def GetHostKey(self): |
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"""Return the rsa hostkey from the config.
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Args: None
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Returns: rsa hostkey
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"""
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self._OpenConfig()
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self._ReleaseLock()
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return self._config_data.cluster.rsahostkeypub |
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def AddInstance(self, instance): |
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"""Add an instance to the config.
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This should be used after creating a new instance.
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Args:
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instance: the instance object
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"""
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if not isinstance(instance, objects.Instance): |
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raise errors.ProgrammerError("Invalid type passed to AddInstance") |
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if instance.disk_template != constants.DT_DISKLESS:
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all_lvs = instance.MapLVsByNode() |
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logger.Info("Instance '%s' DISK_LAYOUT: %s" % (instance.name, all_lvs))
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self._OpenConfig()
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self._config_data.instances[instance.name] = instance
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self._WriteConfig()
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def MarkInstanceUp(self, instance_name): |
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"""Mark the instance status to up in the config.
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"""
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self._OpenConfig()
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if instance_name not in self._config_data.instances: |
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raise errors.ConfigurationError("Unknown instance '%s'" % |
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instance_name) |
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instance = self._config_data.instances[instance_name]
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instance.status = "up"
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self._WriteConfig()
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def RemoveInstance(self, instance_name): |
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"""Remove the instance from the configuration.
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"""
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self._OpenConfig()
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if instance_name not in self._config_data.instances: |
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raise errors.ConfigurationError("Unknown instance '%s'" % instance_name) |
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del self._config_data.instances[instance_name] |
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self._WriteConfig()
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def RenameInstance(self, old_name, new_name): |
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"""Rename an instance.
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This needs to be done in ConfigWriter and not by RemoveInstance
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combined with AddInstance as only we can guarantee an atomic
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rename.
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"""
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self._OpenConfig()
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if old_name not in self._config_data.instances: |
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raise errors.ConfigurationError("Unknown instance '%s'" % old_name) |
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inst = self._config_data.instances[old_name]
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del self._config_data.instances[old_name] |
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inst.name = new_name |
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self._config_data.instances[inst.name] = inst
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self._WriteConfig()
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def MarkInstanceDown(self, instance_name): |
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"""Mark the status of an instance to down in the configuration.
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"""
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self._OpenConfig()
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if instance_name not in self._config_data.instances: |
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raise errors.ConfigurationError("Unknown instance '%s'" % instance_name) |
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instance = self._config_data.instances[instance_name]
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instance.status = "down"
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self._WriteConfig()
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def GetInstanceList(self): |
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"""Get the list of instances.
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Returns:
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array of instances, ex. ['instance2.example.com','instance1.example.com']
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these contains all the instances, also the ones in Admin_down state
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"""
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self._OpenConfig()
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self._ReleaseLock()
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return self._config_data.instances.keys() |
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def ExpandInstanceName(self, short_name): |
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"""Attempt to expand an incomplete instance name.
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"""
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self._OpenConfig()
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self._ReleaseLock()
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return utils.MatchNameComponent(short_name,
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self._config_data.instances.keys())
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def GetInstanceInfo(self, instance_name): |
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"""Returns informations about an instance.
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It takes the information from the configuration file. Other informations of
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an instance are taken from the live systems.
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Args:
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instance: name of the instance, ex instance1.example.com
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Returns:
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the instance object
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"""
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self._OpenConfig()
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self._ReleaseLock()
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if instance_name not in self._config_data.instances: |
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return None |
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return self._config_data.instances[instance_name] |
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def AddNode(self, node): |
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"""Add a node to the configuration.
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Args:
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node: an object.Node instance
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"""
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self._OpenConfig()
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self._config_data.nodes[node.name] = node
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self._WriteConfig()
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def RemoveNode(self, node_name): |
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"""Remove a node from the configuration.
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"""
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self._OpenConfig()
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if node_name not in self._config_data.nodes: |
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raise errors.ConfigurationError("Unknown node '%s'" % node_name) |
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del self._config_data.nodes[node_name] |
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self._WriteConfig()
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def ExpandNodeName(self, short_name): |
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"""Attempt to expand an incomplete instance name.
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"""
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self._OpenConfig()
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self._ReleaseLock()
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return utils.MatchNameComponent(short_name,
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self._config_data.nodes.keys())
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def GetNodeInfo(self, node_name): |
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"""Get the configuration of a node, as stored in the config.
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Args: node: nodename (tuple) of the node
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Returns: the node object
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"""
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self._OpenConfig()
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self._ReleaseLock()
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if node_name not in self._config_data.nodes: |
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return None |
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return self._config_data.nodes[node_name] |
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def GetNodeList(self): |
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"""Return the list of nodes which are in the configuration.
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"""
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self._OpenConfig()
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self._ReleaseLock()
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return self._config_data.nodes.keys() |
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def DumpConfig(self): |
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"""Return the entire configuration of the cluster.
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"""
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self._OpenConfig()
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self._ReleaseLock()
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return self._config_data |
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def _BumpSerialNo(self): |
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"""Bump up the serial number of the config.
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"""
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self._config_data.cluster.serial_no += 1 |
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def _OpenConfig(self): |
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"""Read the config data from disk.
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In case we already have configuration data and the config file has
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the same mtime as when we read it, we skip the parsing of the
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file, since de-serialisation could be slow.
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"""
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try:
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st = os.stat(self._cfg_file)
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except OSError, err: |
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raise errors.ConfigurationError("Can't stat config file: %s" % err) |
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if (self._config_data is not None and |
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self._config_time is not None and |
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self._config_time == st.st_mtime and |
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self._config_size == st.st_size and |
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self._config_inode == st.st_ino):
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# data is current, so skip loading of config file
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return
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f = open(self._cfg_file, 'r') |
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try:
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try:
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data = objects.ConfigData.Load(f) |
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except Exception, err: |
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raise errors.ConfigurationError(err)
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finally:
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f.close() |
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if (not hasattr(data, 'cluster') or |
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not hasattr(data.cluster, 'config_version')): |
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raise errors.ConfigurationError("Incomplete configuration" |
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" (missing cluster.config_version)")
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if data.cluster.config_version != constants.CONFIG_VERSION:
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raise errors.ConfigurationError("Cluster configuration version" |
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" mismatch, got %s instead of %s" %
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(data.cluster.config_version, |
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constants.CONFIG_VERSION)) |
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self._config_data = data
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self._config_time = st.st_mtime
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self._config_size = st.st_size
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self._config_inode = st.st_ino
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def _ReleaseLock(self): |
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"""xxxx
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"""
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def _DistributeConfig(self): |
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"""Distribute the configuration to the other nodes.
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Currently, this only copies the configuration file. In the future,
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it could be used to encapsulate the 2/3-phase update mechanism.
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"""
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if self._offline: |
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return True |
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bad = False
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nodelist = self.GetNodeList()
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myhostname = self._my_hostname
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tgt_list = [] |
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for node in nodelist: |
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nodeinfo = self.GetNodeInfo(node)
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if nodeinfo.name == myhostname:
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continue
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tgt_list.append(node) |
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result = rpc.call_upload_file(tgt_list, self._cfg_file)
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for node in tgt_list: |
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if not result[node]: |
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logger.Error("copy of file %s to node %s failed" %
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(self._cfg_file, node))
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bad = True
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return not bad |
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|
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def _WriteConfig(self, destination=None): |
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"""Write the configuration data to persistent storage.
|
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|
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"""
|
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if destination is None: |
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destination = self._cfg_file
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self._BumpSerialNo()
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dir_name, file_name = os.path.split(destination) |
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fd, name = tempfile.mkstemp('.newconfig', file_name, dir_name)
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f = os.fdopen(fd, 'w')
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try:
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self._config_data.Dump(f)
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os.fsync(f.fileno()) |
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finally:
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f.close() |
548 |
# we don't need to do os.close(fd) as f.close() did it
|
549 |
os.rename(name, destination) |
550 |
self.write_count += 1 |
551 |
# re-set our cache as not to re-read the config file
|
552 |
try:
|
553 |
st = os.stat(destination) |
554 |
except OSError, err: |
555 |
raise errors.ConfigurationError("Can't stat config file: %s" % err) |
556 |
self._config_time = st.st_mtime
|
557 |
self._config_size = st.st_size
|
558 |
self._config_inode = st.st_ino
|
559 |
# and redistribute the config file
|
560 |
self._DistributeConfig()
|
561 |
|
562 |
def InitConfig(self, node, primary_ip, secondary_ip, |
563 |
hostkeypub, mac_prefix, vg_name, def_bridge): |
564 |
"""Create the initial cluster configuration.
|
565 |
|
566 |
It will contain the current node, which will also be the master
|
567 |
node, and no instances or operating systmes.
|
568 |
|
569 |
Args:
|
570 |
node: the nodename of the initial node
|
571 |
primary_ip: the IP address of the current host
|
572 |
secondary_ip: the secondary IP of the current host or None
|
573 |
hostkeypub: the public hostkey of this host
|
574 |
|
575 |
"""
|
576 |
hu_port = constants.FIRST_DRBD_PORT - 1
|
577 |
globalconfig = objects.Cluster(config_version=constants.CONFIG_VERSION, |
578 |
serial_no=1,
|
579 |
rsahostkeypub=hostkeypub, |
580 |
highest_used_port=hu_port, |
581 |
mac_prefix=mac_prefix, |
582 |
volume_group_name=vg_name, |
583 |
default_bridge=def_bridge, |
584 |
tcpudp_port_pool=set())
|
585 |
if secondary_ip is None: |
586 |
secondary_ip = primary_ip |
587 |
nodeconfig = objects.Node(name=node, primary_ip=primary_ip, |
588 |
secondary_ip=secondary_ip) |
589 |
|
590 |
self._config_data = objects.ConfigData(nodes={node: nodeconfig},
|
591 |
instances={}, |
592 |
cluster=globalconfig) |
593 |
self._WriteConfig()
|
594 |
|
595 |
def GetVGName(self): |
596 |
"""Return the volume group name.
|
597 |
|
598 |
"""
|
599 |
self._OpenConfig()
|
600 |
self._ReleaseLock()
|
601 |
return self._config_data.cluster.volume_group_name |
602 |
|
603 |
def GetDefBridge(self): |
604 |
"""Return the default bridge.
|
605 |
|
606 |
"""
|
607 |
self._OpenConfig()
|
608 |
self._ReleaseLock()
|
609 |
return self._config_data.cluster.default_bridge |
610 |
|
611 |
def GetMACPrefix(self): |
612 |
"""Return the mac prefix.
|
613 |
|
614 |
"""
|
615 |
self._OpenConfig()
|
616 |
self._ReleaseLock()
|
617 |
return self._config_data.cluster.mac_prefix |
618 |
|
619 |
def GetClusterInfo(self): |
620 |
"""Returns informations about the cluster
|
621 |
|
622 |
Returns:
|
623 |
the cluster object
|
624 |
|
625 |
"""
|
626 |
self._OpenConfig()
|
627 |
self._ReleaseLock()
|
628 |
|
629 |
return self._config_data.cluster |
630 |
|
631 |
def Update(self, target): |
632 |
"""Notify function to be called after updates.
|
633 |
|
634 |
This function must be called when an object (as returned by
|
635 |
GetInstanceInfo, GetNodeInfo, GetCluster) has been updated and the
|
636 |
caller wants the modifications saved to the backing store. Note
|
637 |
that all modified objects will be saved, but the target argument
|
638 |
is the one the caller wants to ensure that it's saved.
|
639 |
|
640 |
"""
|
641 |
if self._config_data is None: |
642 |
raise errors.ProgrammerError("Configuration file not read," |
643 |
" cannot save.")
|
644 |
if isinstance(target, objects.Cluster): |
645 |
test = target == self._config_data.cluster
|
646 |
elif isinstance(target, objects.Node): |
647 |
test = target in self._config_data.nodes.values() |
648 |
elif isinstance(target, objects.Instance): |
649 |
test = target in self._config_data.instances.values() |
650 |
else:
|
651 |
raise errors.ProgrammerError("Invalid object type (%s) passed to" |
652 |
" ConfigWriter.Update" % type(target)) |
653 |
if not test: |
654 |
raise errors.ConfigurationError("Configuration updated since object" |
655 |
" has been read or unknown object")
|
656 |
self._WriteConfig()
|