root / lib / config.py @ 81a49123
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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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import logging |
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from ganeti import errors |
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from ganeti import locking |
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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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from ganeti import serializer |
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_config_lock = locking.SharedLock() |
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def _ValidateConfig(data): |
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"""Verifies that a configuration objects looks valid.
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This only verifies the version of the configuration.
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@raise errors.ConfigurationError: if the version differs from what
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we expect
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"""
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if data.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.version, |
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constants.CONFIG_VERSION)) |
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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._lock = _config_lock
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self._config_data = 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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self._temporary_drbds = {}
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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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self._last_cluster_serial = -1 |
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self._OpenConfig()
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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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@locking.ssynchronized(_config_lock, shared=1) |
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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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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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@locking.ssynchronized(_config_lock, shared=1) |
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def IsMacInUse(self, mac): |
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"""Predicate: check if the specified MAC is in use in the Ganeti cluster.
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This only checks instances managed by this cluster, it does not
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check for potential collisions elsewhere.
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"""
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all_macs = self._AllMACs()
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return mac in all_macs |
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@locking.ssynchronized(_config_lock, shared=1) |
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def GenerateDRBDSecret(self): |
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"""Generate a DRBD secret.
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This checks the current disks for duplicates.
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"""
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all_secrets = self._AllDRBDSecrets()
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retries = 64
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while retries > 0: |
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secret = utils.GenerateSecret() |
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if secret not in all_secrets: |
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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 DRBD secret") |
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return secret
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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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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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@locking.ssynchronized(_config_lock, shared=1) |
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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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@param 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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@rtype: string
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@return: the unique id
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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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@rtype: list
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@return: the list of all MACs
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"""
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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 _AllDRBDSecrets(self): |
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"""Return all DRBD secrets present in the config.
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@rtype: list
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@return: the list of all DRBD secrets
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"""
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def helper(disk, result): |
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"""Recursively gather secrets from this disk."""
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if disk.dev_type == constants.DT_DRBD8:
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result.append(disk.logical_id[5])
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if disk.children:
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for child in disk.children: |
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helper(child, result) |
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result = [] |
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for instance in self._config_data.instances.values(): |
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for disk in instance.disks: |
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helper(disk, result) |
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return result
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def _UnlockedVerifyConfig(self): |
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"""Verify function.
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@rtype: list
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@return: a list of error messages; a non-empty list signifies
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configuration errors
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"""
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result = [] |
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seen_macs = [] |
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ports = {} |
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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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# gather the drbd ports for duplicate checks
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for dsk in instance.disks: |
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if dsk.dev_type in constants.LDS_DRBD: |
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tcp_port = dsk.logical_id[2]
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if tcp_port not in ports: |
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ports[tcp_port] = [] |
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ports[tcp_port].append((instance.name, "drbd disk %s" % dsk.iv_name))
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# gather network port reservation
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net_port = getattr(instance, "network_port", None) |
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if net_port is not None: |
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if net_port not in ports: |
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ports[net_port] = [] |
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ports[net_port].append((instance.name, "network port"))
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# instance disk verify
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for idx, disk in enumerate(instance.disks): |
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result.extend(["instance '%s' disk %d error: %s" %
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(instance.name, idx, msg) for msg in disk.Verify()]) |
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# cluster-wide pool of free ports
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for free_port in data.cluster.tcpudp_port_pool: |
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if free_port not in ports: |
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ports[free_port] = [] |
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ports[free_port].append(("cluster", "port marked as free")) |
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# compute tcp/udp duplicate ports
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keys = ports.keys() |
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keys.sort() |
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for pnum in keys: |
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pdata = ports[pnum] |
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if len(pdata) > 1: |
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txt = ", ".join(["%s/%s" % val for val in pdata]) |
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result.append("tcp/udp port %s has duplicates: %s" % (pnum, txt))
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# highest used tcp port check
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if keys:
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if keys[-1] > data.cluster.highest_used_port: |
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result.append("Highest used port mismatch, saved %s, computed %s" %
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(data.cluster.highest_used_port, keys[-1]))
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if not data.nodes[data.cluster.master_node].master_candidate: |
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result.append("Master node is not a master candidate")
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# master candidate checks
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mc_now, mc_max = self._UnlockedGetMasterCandidateStats()
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if mc_now < mc_max:
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result.append("Not enough master candidates: actual %d, target %d" %
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(mc_now, mc_max)) |
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# drbd minors check
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d_map, duplicates = self._UnlockedComputeDRBDMap()
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for node, minor, instance_a, instance_b in duplicates: |
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result.append("DRBD minor %d on node %s is assigned twice to instances"
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" %s and %s" % (minor, node, instance_a, instance_b))
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return result
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@locking.ssynchronized(_config_lock, shared=1) |
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def VerifyConfig(self): |
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"""Verify function.
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This is just a wrapper over L{_UnlockedVerifyConfig}.
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@rtype: list
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@return: a list of error messages; a non-empty list signifies
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configuration errors
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"""
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return self._UnlockedVerifyConfig() |
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def _UnlockedSetDiskID(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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This function is for internal use, when the config lock is already held.
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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._UnlockedSetDiskID(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 == constants.LD_DRBD8:
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pnode, snode, port, pminor, sminor, secret = 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._UnlockedGetNodeInfo(pnode)
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snode_info = self._UnlockedGetNodeInfo(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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p_data = (pnode_info.secondary_ip, port) |
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s_data = (snode_info.secondary_ip, port) |
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if pnode == node_name:
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disk.physical_id = p_data + s_data + (pminor, secret) |
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else: # it must be secondary, we tested above |
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disk.physical_id = s_data + p_data + (sminor, secret) |
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else:
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disk.physical_id = disk.logical_id |
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return
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@locking.ssynchronized(_config_lock)
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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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return self._UnlockedSetDiskID(disk, node_name) |
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@locking.ssynchronized(_config_lock)
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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._config_data.cluster.tcpudp_port_pool.add(port)
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self._WriteConfig()
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@locking.ssynchronized(_config_lock, shared=1) |
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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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return self._config_data.cluster.tcpudp_port_pool.copy() |
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@locking.ssynchronized(_config_lock)
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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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# 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 _UnlockedComputeDRBDMap(self): |
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"""Compute the used DRBD minor/nodes.
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@rtype: (dict, list)
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@return: dictionary of node_name: dict of minor: instance_name;
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the returned dict will have all the nodes in it (even if with
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an empty list), and a list of duplicates; if the duplicates
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list is not empty, the configuration is corrupted and its caller
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should raise an exception
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"""
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def _AppendUsedPorts(instance_name, disk, used): |
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duplicates = [] |
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if disk.dev_type == constants.LD_DRBD8 and len(disk.logical_id) >= 5: |
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nodeA, nodeB, dummy, minorA, minorB = disk.logical_id[:5]
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for node, port in ((nodeA, minorA), (nodeB, minorB)): |
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assert node in used, ("Node '%s' of instance '%s' not found" |
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" in node list" % (node, instance_name))
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if port in used[node]: |
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duplicates.append((node, port, instance_name, used[node][port])) |
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else:
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used[node][port] = instance_name |
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if disk.children:
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for child in disk.children: |
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duplicates.extend(_AppendUsedPorts(instance_name, child, used)) |
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return duplicates
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duplicates = [] |
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my_dict = dict((node, {}) for node in self._config_data.nodes) |
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for instance in self._config_data.instances.itervalues(): |
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for disk in instance.disks: |
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duplicates.extend(_AppendUsedPorts(instance.name, disk, my_dict)) |
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for (node, minor), instance in self._temporary_drbds.iteritems(): |
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if minor in my_dict[node] and my_dict[node][minor] != instance: |
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duplicates.append((node, minor, instance, my_dict[node][minor])) |
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else:
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my_dict[node][minor] = instance |
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return my_dict, duplicates
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@locking.ssynchronized(_config_lock)
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def ComputeDRBDMap(self): |
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"""Compute the used DRBD minor/nodes.
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This is just a wrapper over L{_UnlockedComputeDRBDMap}.
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@return: dictionary of node_name: dict of minor: instance_name;
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the returned dict will have all the nodes in it (even if with
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an empty list).
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"""
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d_map, duplicates = self._UnlockedComputeDRBDMap()
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if duplicates:
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raise errors.ConfigurationError("Duplicate DRBD ports detected: %s" % |
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str(duplicates))
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return d_map
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@locking.ssynchronized(_config_lock)
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def AllocateDRBDMinor(self, nodes, instance): |
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"""Allocate a drbd minor.
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The free minor will be automatically computed from the existing
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devices. A node can be given multiple times in order to allocate
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multiple minors. The result is the list of minors, in the same
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order as the passed nodes.
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@type instance: string
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@param instance: the instance for which we allocate minors
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"""
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assert isinstance(instance, basestring), \ |
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"Invalid argument '%s' passed to AllocateDRBDMinor" % instance
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d_map, duplicates = self._UnlockedComputeDRBDMap()
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if duplicates:
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raise errors.ConfigurationError("Duplicate DRBD ports detected: %s" % |
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str(duplicates))
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result = [] |
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for nname in nodes: |
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ndata = d_map[nname] |
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if not ndata: |
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# no minors used, we can start at 0
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result.append(0)
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ndata[0] = instance
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self._temporary_drbds[(nname, 0)] = instance |
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continue
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keys = ndata.keys() |
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keys.sort() |
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ffree = utils.FirstFree(keys) |
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if ffree is None: |
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# return the next minor
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# TODO: implement high-limit check
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minor = keys[-1] + 1 |
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else:
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minor = ffree |
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# double-check minor against current instances
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assert minor not in d_map[nname], \ |
516 |
("Attempt to reuse allocated DRBD minor %d on node %s,"
|
517 |
" already allocated to instance %s" %
|
518 |
(minor, nname, d_map[nname][minor])) |
519 |
ndata[minor] = instance |
520 |
# double-check minor against reservation
|
521 |
r_key = (nname, minor) |
522 |
assert r_key not in self._temporary_drbds, \ |
523 |
("Attempt to reuse reserved DRBD minor %d on node %s,"
|
524 |
" reserved for instance %s" %
|
525 |
(minor, nname, self._temporary_drbds[r_key]))
|
526 |
self._temporary_drbds[r_key] = instance
|
527 |
result.append(minor) |
528 |
logging.debug("Request to allocate drbd minors, input: %s, returning %s",
|
529 |
nodes, result) |
530 |
return result
|
531 |
|
532 |
def _UnlockedReleaseDRBDMinors(self, instance): |
533 |
"""Release temporary drbd minors allocated for a given instance.
|
534 |
|
535 |
@type instance: string
|
536 |
@param instance: the instance for which temporary minors should be
|
537 |
released
|
538 |
|
539 |
"""
|
540 |
assert isinstance(instance, basestring), \ |
541 |
"Invalid argument passed to ReleaseDRBDMinors"
|
542 |
for key, name in self._temporary_drbds.items(): |
543 |
if name == instance:
|
544 |
del self._temporary_drbds[key] |
545 |
|
546 |
@locking.ssynchronized(_config_lock)
|
547 |
def ReleaseDRBDMinors(self, instance): |
548 |
"""Release temporary drbd minors allocated for a given instance.
|
549 |
|
550 |
This should be called on the error paths, on the success paths
|
551 |
it's automatically called by the ConfigWriter add and update
|
552 |
functions.
|
553 |
|
554 |
This function is just a wrapper over L{_UnlockedReleaseDRBDMinors}.
|
555 |
|
556 |
@type instance: string
|
557 |
@param instance: the instance for which temporary minors should be
|
558 |
released
|
559 |
|
560 |
"""
|
561 |
self._UnlockedReleaseDRBDMinors(instance)
|
562 |
|
563 |
@locking.ssynchronized(_config_lock, shared=1) |
564 |
def GetConfigVersion(self): |
565 |
"""Get the configuration version.
|
566 |
|
567 |
@return: Config version
|
568 |
|
569 |
"""
|
570 |
return self._config_data.version |
571 |
|
572 |
@locking.ssynchronized(_config_lock, shared=1) |
573 |
def GetClusterName(self): |
574 |
"""Get cluster name.
|
575 |
|
576 |
@return: Cluster name
|
577 |
|
578 |
"""
|
579 |
return self._config_data.cluster.cluster_name |
580 |
|
581 |
@locking.ssynchronized(_config_lock, shared=1) |
582 |
def GetMasterNode(self): |
583 |
"""Get the hostname of the master node for this cluster.
|
584 |
|
585 |
@return: Master hostname
|
586 |
|
587 |
"""
|
588 |
return self._config_data.cluster.master_node |
589 |
|
590 |
@locking.ssynchronized(_config_lock, shared=1) |
591 |
def GetMasterIP(self): |
592 |
"""Get the IP of the master node for this cluster.
|
593 |
|
594 |
@return: Master IP
|
595 |
|
596 |
"""
|
597 |
return self._config_data.cluster.master_ip |
598 |
|
599 |
@locking.ssynchronized(_config_lock, shared=1) |
600 |
def GetMasterNetdev(self): |
601 |
"""Get the master network device for this cluster.
|
602 |
|
603 |
"""
|
604 |
return self._config_data.cluster.master_netdev |
605 |
|
606 |
@locking.ssynchronized(_config_lock, shared=1) |
607 |
def GetFileStorageDir(self): |
608 |
"""Get the file storage dir for this cluster.
|
609 |
|
610 |
"""
|
611 |
return self._config_data.cluster.file_storage_dir |
612 |
|
613 |
@locking.ssynchronized(_config_lock, shared=1) |
614 |
def GetHypervisorType(self): |
615 |
"""Get the hypervisor type for this cluster.
|
616 |
|
617 |
"""
|
618 |
return self._config_data.cluster.default_hypervisor |
619 |
|
620 |
@locking.ssynchronized(_config_lock, shared=1) |
621 |
def GetHostKey(self): |
622 |
"""Return the rsa hostkey from the config.
|
623 |
|
624 |
@rtype: string
|
625 |
@return: the rsa hostkey
|
626 |
|
627 |
"""
|
628 |
return self._config_data.cluster.rsahostkeypub |
629 |
|
630 |
@locking.ssynchronized(_config_lock)
|
631 |
def AddInstance(self, instance): |
632 |
"""Add an instance to the config.
|
633 |
|
634 |
This should be used after creating a new instance.
|
635 |
|
636 |
@type instance: L{objects.Instance}
|
637 |
@param instance: the instance object
|
638 |
|
639 |
"""
|
640 |
if not isinstance(instance, objects.Instance): |
641 |
raise errors.ProgrammerError("Invalid type passed to AddInstance") |
642 |
|
643 |
if instance.disk_template != constants.DT_DISKLESS:
|
644 |
all_lvs = instance.MapLVsByNode() |
645 |
logging.info("Instance '%s' DISK_LAYOUT: %s", instance.name, all_lvs)
|
646 |
|
647 |
instance.serial_no = 1
|
648 |
self._config_data.instances[instance.name] = instance
|
649 |
self._config_data.cluster.serial_no += 1 |
650 |
self._UnlockedReleaseDRBDMinors(instance.name)
|
651 |
self._WriteConfig()
|
652 |
|
653 |
def _SetInstanceStatus(self, instance_name, status): |
654 |
"""Set the instance's status to a given value.
|
655 |
|
656 |
"""
|
657 |
assert isinstance(status, bool), \ |
658 |
"Invalid status '%s' passed to SetInstanceStatus" % (status,)
|
659 |
|
660 |
if instance_name not in self._config_data.instances: |
661 |
raise errors.ConfigurationError("Unknown instance '%s'" % |
662 |
instance_name) |
663 |
instance = self._config_data.instances[instance_name]
|
664 |
if instance.admin_up != status:
|
665 |
instance.admin_up = status |
666 |
instance.serial_no += 1
|
667 |
self._WriteConfig()
|
668 |
|
669 |
@locking.ssynchronized(_config_lock)
|
670 |
def MarkInstanceUp(self, instance_name): |
671 |
"""Mark the instance status to up in the config.
|
672 |
|
673 |
"""
|
674 |
self._SetInstanceStatus(instance_name, True) |
675 |
|
676 |
@locking.ssynchronized(_config_lock)
|
677 |
def RemoveInstance(self, instance_name): |
678 |
"""Remove the instance from the configuration.
|
679 |
|
680 |
"""
|
681 |
if instance_name not in self._config_data.instances: |
682 |
raise errors.ConfigurationError("Unknown instance '%s'" % instance_name) |
683 |
del self._config_data.instances[instance_name] |
684 |
self._config_data.cluster.serial_no += 1 |
685 |
self._WriteConfig()
|
686 |
|
687 |
@locking.ssynchronized(_config_lock)
|
688 |
def RenameInstance(self, old_name, new_name): |
689 |
"""Rename an instance.
|
690 |
|
691 |
This needs to be done in ConfigWriter and not by RemoveInstance
|
692 |
combined with AddInstance as only we can guarantee an atomic
|
693 |
rename.
|
694 |
|
695 |
"""
|
696 |
if old_name not in self._config_data.instances: |
697 |
raise errors.ConfigurationError("Unknown instance '%s'" % old_name) |
698 |
inst = self._config_data.instances[old_name]
|
699 |
del self._config_data.instances[old_name] |
700 |
inst.name = new_name |
701 |
|
702 |
for disk in inst.disks: |
703 |
if disk.dev_type == constants.LD_FILE:
|
704 |
# rename the file paths in logical and physical id
|
705 |
file_storage_dir = os.path.dirname(os.path.dirname(disk.logical_id[1]))
|
706 |
disk.physical_id = disk.logical_id = (disk.logical_id[0],
|
707 |
os.path.join(file_storage_dir, |
708 |
inst.name, |
709 |
disk.iv_name)) |
710 |
|
711 |
self._config_data.instances[inst.name] = inst
|
712 |
self._WriteConfig()
|
713 |
|
714 |
@locking.ssynchronized(_config_lock)
|
715 |
def MarkInstanceDown(self, instance_name): |
716 |
"""Mark the status of an instance to down in the configuration.
|
717 |
|
718 |
"""
|
719 |
self._SetInstanceStatus(instance_name, False) |
720 |
|
721 |
def _UnlockedGetInstanceList(self): |
722 |
"""Get the list of instances.
|
723 |
|
724 |
This function is for internal use, when the config lock is already held.
|
725 |
|
726 |
"""
|
727 |
return self._config_data.instances.keys() |
728 |
|
729 |
@locking.ssynchronized(_config_lock, shared=1) |
730 |
def GetInstanceList(self): |
731 |
"""Get the list of instances.
|
732 |
|
733 |
@return: array of instances, ex. ['instance2.example.com',
|
734 |
'instance1.example.com']
|
735 |
|
736 |
"""
|
737 |
return self._UnlockedGetInstanceList() |
738 |
|
739 |
@locking.ssynchronized(_config_lock, shared=1) |
740 |
def ExpandInstanceName(self, short_name): |
741 |
"""Attempt to expand an incomplete instance name.
|
742 |
|
743 |
"""
|
744 |
return utils.MatchNameComponent(short_name,
|
745 |
self._config_data.instances.keys())
|
746 |
|
747 |
def _UnlockedGetInstanceInfo(self, instance_name): |
748 |
"""Returns informations about an instance.
|
749 |
|
750 |
This function is for internal use, when the config lock is already held.
|
751 |
|
752 |
"""
|
753 |
if instance_name not in self._config_data.instances: |
754 |
return None |
755 |
|
756 |
return self._config_data.instances[instance_name] |
757 |
|
758 |
@locking.ssynchronized(_config_lock, shared=1) |
759 |
def GetInstanceInfo(self, instance_name): |
760 |
"""Returns informations about an instance.
|
761 |
|
762 |
It takes the information from the configuration file. Other informations of
|
763 |
an instance are taken from the live systems.
|
764 |
|
765 |
@param instance_name: name of the instance, e.g.
|
766 |
I{instance1.example.com}
|
767 |
|
768 |
@rtype: L{objects.Instance}
|
769 |
@return: the instance object
|
770 |
|
771 |
"""
|
772 |
return self._UnlockedGetInstanceInfo(instance_name) |
773 |
|
774 |
@locking.ssynchronized(_config_lock, shared=1) |
775 |
def GetAllInstancesInfo(self): |
776 |
"""Get the configuration of all instances.
|
777 |
|
778 |
@rtype: dict
|
779 |
@returns: dict of (instance, instance_info), where instance_info is what
|
780 |
would GetInstanceInfo return for the node
|
781 |
|
782 |
"""
|
783 |
my_dict = dict([(instance, self._UnlockedGetInstanceInfo(instance)) |
784 |
for instance in self._UnlockedGetInstanceList()]) |
785 |
return my_dict
|
786 |
|
787 |
@locking.ssynchronized(_config_lock)
|
788 |
def AddNode(self, node): |
789 |
"""Add a node to the configuration.
|
790 |
|
791 |
@type node: L{objects.Node}
|
792 |
@param node: a Node instance
|
793 |
|
794 |
"""
|
795 |
logging.info("Adding node %s to configuration" % node.name)
|
796 |
|
797 |
node.serial_no = 1
|
798 |
self._config_data.nodes[node.name] = node
|
799 |
self._config_data.cluster.serial_no += 1 |
800 |
self._WriteConfig()
|
801 |
|
802 |
@locking.ssynchronized(_config_lock)
|
803 |
def RemoveNode(self, node_name): |
804 |
"""Remove a node from the configuration.
|
805 |
|
806 |
"""
|
807 |
logging.info("Removing node %s from configuration" % node_name)
|
808 |
|
809 |
if node_name not in self._config_data.nodes: |
810 |
raise errors.ConfigurationError("Unknown node '%s'" % node_name) |
811 |
|
812 |
del self._config_data.nodes[node_name] |
813 |
self._config_data.cluster.serial_no += 1 |
814 |
self._WriteConfig()
|
815 |
|
816 |
@locking.ssynchronized(_config_lock, shared=1) |
817 |
def ExpandNodeName(self, short_name): |
818 |
"""Attempt to expand an incomplete instance name.
|
819 |
|
820 |
"""
|
821 |
return utils.MatchNameComponent(short_name,
|
822 |
self._config_data.nodes.keys())
|
823 |
|
824 |
def _UnlockedGetNodeInfo(self, node_name): |
825 |
"""Get the configuration of a node, as stored in the config.
|
826 |
|
827 |
This function is for internal use, when the config lock is already
|
828 |
held.
|
829 |
|
830 |
@param node_name: the node name, e.g. I{node1.example.com}
|
831 |
|
832 |
@rtype: L{objects.Node}
|
833 |
@return: the node object
|
834 |
|
835 |
"""
|
836 |
if node_name not in self._config_data.nodes: |
837 |
return None |
838 |
|
839 |
return self._config_data.nodes[node_name] |
840 |
|
841 |
|
842 |
@locking.ssynchronized(_config_lock, shared=1) |
843 |
def GetNodeInfo(self, node_name): |
844 |
"""Get the configuration of a node, as stored in the config.
|
845 |
|
846 |
This is just a locked wrapper over L{_UnlockedGetNodeInfo}.
|
847 |
|
848 |
@param node_name: the node name, e.g. I{node1.example.com}
|
849 |
|
850 |
@rtype: L{objects.Node}
|
851 |
@return: the node object
|
852 |
|
853 |
"""
|
854 |
return self._UnlockedGetNodeInfo(node_name) |
855 |
|
856 |
def _UnlockedGetNodeList(self): |
857 |
"""Return the list of nodes which are in the configuration.
|
858 |
|
859 |
This function is for internal use, when the config lock is already
|
860 |
held.
|
861 |
|
862 |
@rtype: list
|
863 |
|
864 |
"""
|
865 |
return self._config_data.nodes.keys() |
866 |
|
867 |
|
868 |
@locking.ssynchronized(_config_lock, shared=1) |
869 |
def GetNodeList(self): |
870 |
"""Return the list of nodes which are in the configuration.
|
871 |
|
872 |
"""
|
873 |
return self._UnlockedGetNodeList() |
874 |
|
875 |
@locking.ssynchronized(_config_lock, shared=1) |
876 |
def GetOnlineNodeList(self): |
877 |
"""Return the list of nodes which are online.
|
878 |
|
879 |
"""
|
880 |
all_nodes = [self._UnlockedGetNodeInfo(node)
|
881 |
for node in self._UnlockedGetNodeList()] |
882 |
return [node.name for node in all_nodes if not node.offline] |
883 |
|
884 |
@locking.ssynchronized(_config_lock, shared=1) |
885 |
def GetAllNodesInfo(self): |
886 |
"""Get the configuration of all nodes.
|
887 |
|
888 |
@rtype: dict
|
889 |
@return: dict of (node, node_info), where node_info is what
|
890 |
would GetNodeInfo return for the node
|
891 |
|
892 |
"""
|
893 |
my_dict = dict([(node, self._UnlockedGetNodeInfo(node)) |
894 |
for node in self._UnlockedGetNodeList()]) |
895 |
return my_dict
|
896 |
|
897 |
def _UnlockedGetMasterCandidateStats(self): |
898 |
"""Get the number of current and maximum desired and possible candidates.
|
899 |
|
900 |
@rtype: tuple
|
901 |
@return: tuple of (current, desired and possible)
|
902 |
|
903 |
"""
|
904 |
mc_now = mc_max = 0
|
905 |
for node in self._config_data.nodes.itervalues(): |
906 |
if not node.offline: |
907 |
mc_max += 1
|
908 |
if node.master_candidate:
|
909 |
mc_now += 1
|
910 |
mc_max = min(mc_max, self._config_data.cluster.candidate_pool_size) |
911 |
return (mc_now, mc_max)
|
912 |
|
913 |
@locking.ssynchronized(_config_lock, shared=1) |
914 |
def GetMasterCandidateStats(self): |
915 |
"""Get the number of current and maximum possible candidates.
|
916 |
|
917 |
This is just a wrapper over L{_UnlockedGetMasterCandidateStats}.
|
918 |
|
919 |
@rtype: tuple
|
920 |
@return: tuple of (current, max)
|
921 |
|
922 |
"""
|
923 |
return self._UnlockedGetMasterCandidateStats() |
924 |
|
925 |
@locking.ssynchronized(_config_lock)
|
926 |
def MaintainCandidatePool(self): |
927 |
"""Try to grow the candidate pool to the desired size.
|
928 |
|
929 |
@rtype: list
|
930 |
@return: list with the adjusted nodes (L{objects.Node} instances)
|
931 |
|
932 |
"""
|
933 |
mc_now, mc_max = self._UnlockedGetMasterCandidateStats()
|
934 |
mod_list = [] |
935 |
if mc_now < mc_max:
|
936 |
node_list = self._config_data.nodes.keys()
|
937 |
random.shuffle(node_list) |
938 |
for name in node_list: |
939 |
if mc_now >= mc_max:
|
940 |
break
|
941 |
node = self._config_data.nodes[name]
|
942 |
if node.master_candidate or node.offline: |
943 |
continue
|
944 |
mod_list.append(node) |
945 |
node.master_candidate = True
|
946 |
node.serial_no += 1
|
947 |
mc_now += 1
|
948 |
if mc_now != mc_max:
|
949 |
# this should not happen
|
950 |
logging.warning("Warning: MaintainCandidatePool didn't manage to"
|
951 |
" fill the candidate pool (%d/%d)", mc_now, mc_max)
|
952 |
if mod_list:
|
953 |
self._config_data.cluster.serial_no += 1 |
954 |
self._WriteConfig()
|
955 |
|
956 |
return mod_list
|
957 |
|
958 |
def _BumpSerialNo(self): |
959 |
"""Bump up the serial number of the config.
|
960 |
|
961 |
"""
|
962 |
self._config_data.serial_no += 1 |
963 |
|
964 |
def _OpenConfig(self): |
965 |
"""Read the config data from disk.
|
966 |
|
967 |
"""
|
968 |
f = open(self._cfg_file, 'r') |
969 |
try:
|
970 |
try:
|
971 |
data = objects.ConfigData.FromDict(serializer.Load(f.read())) |
972 |
except Exception, err: |
973 |
raise errors.ConfigurationError(err)
|
974 |
finally:
|
975 |
f.close() |
976 |
|
977 |
# Make sure the configuration has the right version
|
978 |
_ValidateConfig(data) |
979 |
|
980 |
if (not hasattr(data, 'cluster') or |
981 |
not hasattr(data.cluster, 'rsahostkeypub')): |
982 |
raise errors.ConfigurationError("Incomplete configuration" |
983 |
" (missing cluster.rsahostkeypub)")
|
984 |
self._config_data = data
|
985 |
# reset the last serial as -1 so that the next write will cause
|
986 |
# ssconf update
|
987 |
self._last_cluster_serial = -1 |
988 |
|
989 |
def _DistributeConfig(self): |
990 |
"""Distribute the configuration to the other nodes.
|
991 |
|
992 |
Currently, this only copies the configuration file. In the future,
|
993 |
it could be used to encapsulate the 2/3-phase update mechanism.
|
994 |
|
995 |
"""
|
996 |
if self._offline: |
997 |
return True |
998 |
bad = False
|
999 |
|
1000 |
node_list = [] |
1001 |
addr_list = [] |
1002 |
myhostname = self._my_hostname
|
1003 |
# we can skip checking whether _UnlockedGetNodeInfo returns None
|
1004 |
# since the node list comes from _UnlocketGetNodeList, and we are
|
1005 |
# called with the lock held, so no modifications should take place
|
1006 |
# in between
|
1007 |
for node_name in self._UnlockedGetNodeList(): |
1008 |
if node_name == myhostname:
|
1009 |
continue
|
1010 |
node_info = self._UnlockedGetNodeInfo(node_name)
|
1011 |
if not node_info.master_candidate: |
1012 |
continue
|
1013 |
node_list.append(node_info.name) |
1014 |
addr_list.append(node_info.primary_ip) |
1015 |
|
1016 |
result = rpc.RpcRunner.call_upload_file(node_list, self._cfg_file,
|
1017 |
address_list=addr_list) |
1018 |
for node in node_list: |
1019 |
if not result[node]: |
1020 |
logging.error("copy of file %s to node %s failed",
|
1021 |
self._cfg_file, node)
|
1022 |
bad = True
|
1023 |
return not bad |
1024 |
|
1025 |
def _WriteConfig(self, destination=None): |
1026 |
"""Write the configuration data to persistent storage.
|
1027 |
|
1028 |
"""
|
1029 |
config_errors = self._UnlockedVerifyConfig()
|
1030 |
if config_errors:
|
1031 |
raise errors.ConfigurationError("Configuration data is not" |
1032 |
" consistent: %s" %
|
1033 |
(", ".join(config_errors)))
|
1034 |
if destination is None: |
1035 |
destination = self._cfg_file
|
1036 |
self._BumpSerialNo()
|
1037 |
txt = serializer.Dump(self._config_data.ToDict())
|
1038 |
dir_name, file_name = os.path.split(destination) |
1039 |
fd, name = tempfile.mkstemp('.newconfig', file_name, dir_name)
|
1040 |
f = os.fdopen(fd, 'w')
|
1041 |
try:
|
1042 |
f.write(txt) |
1043 |
os.fsync(f.fileno()) |
1044 |
finally:
|
1045 |
f.close() |
1046 |
# we don't need to do os.close(fd) as f.close() did it
|
1047 |
os.rename(name, destination) |
1048 |
self.write_count += 1 |
1049 |
|
1050 |
# and redistribute the config file to master candidates
|
1051 |
self._DistributeConfig()
|
1052 |
|
1053 |
# Write ssconf files on all nodes (including locally)
|
1054 |
if self._last_cluster_serial < self._config_data.cluster.serial_no: |
1055 |
if not self._offline: |
1056 |
rpc.RpcRunner.call_write_ssconf_files(self._UnlockedGetNodeList(),
|
1057 |
self._UnlockedGetSsconfValues())
|
1058 |
self._last_cluster_serial = self._config_data.cluster.serial_no |
1059 |
|
1060 |
def _UnlockedGetSsconfValues(self): |
1061 |
"""Return the values needed by ssconf.
|
1062 |
|
1063 |
@rtype: dict
|
1064 |
@return: a dictionary with keys the ssconf names and values their
|
1065 |
associated value
|
1066 |
|
1067 |
"""
|
1068 |
fn = "\n".join
|
1069 |
instance_names = utils.NiceSort(self._UnlockedGetInstanceList())
|
1070 |
node_names = utils.NiceSort(self._UnlockedGetNodeList())
|
1071 |
node_info = [self._UnlockedGetNodeInfo(name) for name in node_names] |
1072 |
|
1073 |
instance_data = fn(instance_names) |
1074 |
off_data = fn(node.name for node in node_info if node.offline) |
1075 |
on_data = fn(node.name for node in node_info if not node.offline) |
1076 |
mc_data = fn(node.name for node in node_info if node.master_candidate) |
1077 |
node_data = fn(node_names) |
1078 |
|
1079 |
cluster = self._config_data.cluster
|
1080 |
return {
|
1081 |
constants.SS_CLUSTER_NAME: cluster.cluster_name, |
1082 |
constants.SS_FILE_STORAGE_DIR: cluster.file_storage_dir, |
1083 |
constants.SS_MASTER_CANDIDATES: mc_data, |
1084 |
constants.SS_MASTER_IP: cluster.master_ip, |
1085 |
constants.SS_MASTER_NETDEV: cluster.master_netdev, |
1086 |
constants.SS_MASTER_NODE: cluster.master_node, |
1087 |
constants.SS_NODE_LIST: node_data, |
1088 |
constants.SS_OFFLINE_NODES: off_data, |
1089 |
constants.SS_ONLINE_NODES: on_data, |
1090 |
constants.SS_INSTANCE_LIST: instance_data, |
1091 |
constants.SS_RELEASE_VERSION: constants.RELEASE_VERSION, |
1092 |
} |
1093 |
|
1094 |
@locking.ssynchronized(_config_lock)
|
1095 |
def InitConfig(self, version, cluster_config, master_node_config): |
1096 |
"""Create the initial cluster configuration.
|
1097 |
|
1098 |
It will contain the current node, which will also be the master
|
1099 |
node, and no instances.
|
1100 |
|
1101 |
@type version: int
|
1102 |
@param version: Configuration version
|
1103 |
@type cluster_config: objects.Cluster
|
1104 |
@param cluster_config: Cluster configuration
|
1105 |
@type master_node_config: objects.Node
|
1106 |
@param master_node_config: Master node configuration
|
1107 |
|
1108 |
"""
|
1109 |
nodes = { |
1110 |
master_node_config.name: master_node_config, |
1111 |
} |
1112 |
|
1113 |
self._config_data = objects.ConfigData(version=version,
|
1114 |
cluster=cluster_config, |
1115 |
nodes=nodes, |
1116 |
instances={}, |
1117 |
serial_no=1)
|
1118 |
self._WriteConfig()
|
1119 |
|
1120 |
@locking.ssynchronized(_config_lock, shared=1) |
1121 |
def GetVGName(self): |
1122 |
"""Return the volume group name.
|
1123 |
|
1124 |
"""
|
1125 |
return self._config_data.cluster.volume_group_name |
1126 |
|
1127 |
@locking.ssynchronized(_config_lock)
|
1128 |
def SetVGName(self, vg_name): |
1129 |
"""Set the volume group name.
|
1130 |
|
1131 |
"""
|
1132 |
self._config_data.cluster.volume_group_name = vg_name
|
1133 |
self._config_data.cluster.serial_no += 1 |
1134 |
self._WriteConfig()
|
1135 |
|
1136 |
@locking.ssynchronized(_config_lock, shared=1) |
1137 |
def GetDefBridge(self): |
1138 |
"""Return the default bridge.
|
1139 |
|
1140 |
"""
|
1141 |
return self._config_data.cluster.default_bridge |
1142 |
|
1143 |
@locking.ssynchronized(_config_lock, shared=1) |
1144 |
def GetMACPrefix(self): |
1145 |
"""Return the mac prefix.
|
1146 |
|
1147 |
"""
|
1148 |
return self._config_data.cluster.mac_prefix |
1149 |
|
1150 |
@locking.ssynchronized(_config_lock, shared=1) |
1151 |
def GetClusterInfo(self): |
1152 |
"""Returns informations about the cluster
|
1153 |
|
1154 |
@rtype: L{objects.Cluster}
|
1155 |
@return: the cluster object
|
1156 |
|
1157 |
"""
|
1158 |
return self._config_data.cluster |
1159 |
|
1160 |
@locking.ssynchronized(_config_lock)
|
1161 |
def Update(self, target): |
1162 |
"""Notify function to be called after updates.
|
1163 |
|
1164 |
This function must be called when an object (as returned by
|
1165 |
GetInstanceInfo, GetNodeInfo, GetCluster) has been updated and the
|
1166 |
caller wants the modifications saved to the backing store. Note
|
1167 |
that all modified objects will be saved, but the target argument
|
1168 |
is the one the caller wants to ensure that it's saved.
|
1169 |
|
1170 |
@param target: an instance of either L{objects.Cluster},
|
1171 |
L{objects.Node} or L{objects.Instance} which is existing in
|
1172 |
the cluster
|
1173 |
|
1174 |
"""
|
1175 |
if self._config_data is None: |
1176 |
raise errors.ProgrammerError("Configuration file not read," |
1177 |
" cannot save.")
|
1178 |
update_serial = False
|
1179 |
if isinstance(target, objects.Cluster): |
1180 |
test = target == self._config_data.cluster
|
1181 |
elif isinstance(target, objects.Node): |
1182 |
test = target in self._config_data.nodes.values() |
1183 |
update_serial = True
|
1184 |
elif isinstance(target, objects.Instance): |
1185 |
test = target in self._config_data.instances.values() |
1186 |
else:
|
1187 |
raise errors.ProgrammerError("Invalid object type (%s) passed to" |
1188 |
" ConfigWriter.Update" % type(target)) |
1189 |
if not test: |
1190 |
raise errors.ConfigurationError("Configuration updated since object" |
1191 |
" has been read or unknown object")
|
1192 |
target.serial_no += 1
|
1193 |
|
1194 |
if update_serial:
|
1195 |
# for node updates, we need to increase the cluster serial too
|
1196 |
self._config_data.cluster.serial_no += 1 |
1197 |
|
1198 |
if isinstance(target, objects.Instance): |
1199 |
self._UnlockedReleaseDRBDMinors(target.name)
|
1200 |
|
1201 |
self._WriteConfig()
|