root / lib / cmdlib / instance_migration.py @ a295eb80
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#
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# Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 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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"""Logical units dealing with instance migration an failover."""
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import logging |
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import time |
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from ganeti import constants |
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from ganeti import errors |
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from ganeti import locking |
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from ganeti.masterd import iallocator |
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from ganeti import utils |
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from ganeti.cmdlib.base import LogicalUnit, Tasklet |
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from ganeti.cmdlib.common import ExpandInstanceName, \ |
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CheckIAllocatorOrNode, ExpandNodeName |
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from ganeti.cmdlib.instance_storage import CheckDiskConsistency, \ |
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ExpandCheckDisks, ShutdownInstanceDisks, AssembleInstanceDisks |
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from ganeti.cmdlib.instance_utils import BuildInstanceHookEnvByObject, \ |
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CheckTargetNodeIPolicy, ReleaseLocks, CheckNodeNotDrained, \ |
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CopyLockList, CheckNodeFreeMemory, CheckInstanceBridgesExist |
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import ganeti.masterd.instance |
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def _ExpandNamesForMigration(lu): |
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"""Expands names for use with L{TLMigrateInstance}.
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@type lu: L{LogicalUnit}
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"""
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if lu.op.target_node is not None: |
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lu.op.target_node = ExpandNodeName(lu.cfg, lu.op.target_node) |
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lu.needed_locks[locking.LEVEL_NODE] = [] |
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lu.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_REPLACE |
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lu.needed_locks[locking.LEVEL_NODE_RES] = [] |
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lu.recalculate_locks[locking.LEVEL_NODE_RES] = constants.LOCKS_REPLACE |
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# The node allocation lock is actually only needed for externally replicated
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# instances (e.g. sharedfile or RBD) and if an iallocator is used.
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lu.needed_locks[locking.LEVEL_NODE_ALLOC] = [] |
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def _DeclareLocksForMigration(lu, level): |
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"""Declares locks for L{TLMigrateInstance}.
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@type lu: L{LogicalUnit}
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@param level: Lock level
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"""
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if level == locking.LEVEL_NODE_ALLOC:
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assert lu.op.instance_name in lu.owned_locks(locking.LEVEL_INSTANCE) |
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instance = lu.cfg.GetInstanceInfo(lu.op.instance_name) |
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# Node locks are already declared here rather than at LEVEL_NODE as we need
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# the instance object anyway to declare the node allocation lock.
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if instance.disk_template in constants.DTS_EXT_MIRROR: |
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if lu.op.target_node is None: |
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lu.needed_locks[locking.LEVEL_NODE] = locking.ALL_SET |
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lu.needed_locks[locking.LEVEL_NODE_ALLOC] = locking.ALL_SET |
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else:
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lu.needed_locks[locking.LEVEL_NODE] = [instance.primary_node, |
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lu.op.target_node] |
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del lu.recalculate_locks[locking.LEVEL_NODE]
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else:
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lu._LockInstancesNodes() # pylint: disable=W0212
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elif level == locking.LEVEL_NODE:
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# Node locks are declared together with the node allocation lock
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assert (lu.needed_locks[locking.LEVEL_NODE] or |
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lu.needed_locks[locking.LEVEL_NODE] is locking.ALL_SET)
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elif level == locking.LEVEL_NODE_RES:
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# Copy node locks
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lu.needed_locks[locking.LEVEL_NODE_RES] = \ |
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CopyLockList(lu.needed_locks[locking.LEVEL_NODE]) |
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class LUInstanceFailover(LogicalUnit): |
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"""Failover an instance.
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"""
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HPATH = "instance-failover"
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HTYPE = constants.HTYPE_INSTANCE |
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REQ_BGL = False
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def CheckArguments(self): |
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"""Check the arguments.
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"""
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self.iallocator = getattr(self.op, "iallocator", None) |
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self.target_node = getattr(self.op, "target_node", None) |
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def ExpandNames(self): |
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self._ExpandAndLockInstance()
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_ExpandNamesForMigration(self)
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self._migrater = \
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TLMigrateInstance(self, self.op.instance_name, False, True, False, |
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self.op.ignore_consistency, True, |
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self.op.shutdown_timeout, self.op.ignore_ipolicy) |
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self.tasklets = [self._migrater] |
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def DeclareLocks(self, level): |
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_DeclareLocksForMigration(self, level)
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def BuildHooksEnv(self): |
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"""Build hooks env.
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This runs on master, primary and secondary nodes of the instance.
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"""
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instance = self._migrater.instance
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source_node = instance.primary_node |
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target_node = self.op.target_node
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env = { |
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"IGNORE_CONSISTENCY": self.op.ignore_consistency, |
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"SHUTDOWN_TIMEOUT": self.op.shutdown_timeout, |
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"OLD_PRIMARY": source_node,
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"NEW_PRIMARY": target_node,
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} |
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if instance.disk_template in constants.DTS_INT_MIRROR: |
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env["OLD_SECONDARY"] = instance.secondary_nodes[0] |
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env["NEW_SECONDARY"] = source_node
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else:
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env["OLD_SECONDARY"] = env["NEW_SECONDARY"] = "" |
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env.update(BuildInstanceHookEnvByObject(self, instance))
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return env
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def BuildHooksNodes(self): |
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"""Build hooks nodes.
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"""
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instance = self._migrater.instance
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nl = [self.cfg.GetMasterNode()] + list(instance.secondary_nodes) |
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return (nl, nl + [instance.primary_node])
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class LUInstanceMigrate(LogicalUnit): |
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"""Migrate an instance.
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This is migration without shutting down, compared to the failover,
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which is done with shutdown.
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"""
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HPATH = "instance-migrate"
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HTYPE = constants.HTYPE_INSTANCE |
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REQ_BGL = False
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def ExpandNames(self): |
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self._ExpandAndLockInstance()
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_ExpandNamesForMigration(self)
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self._migrater = \
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TLMigrateInstance(self, self.op.instance_name, self.op.cleanup, |
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False, self.op.allow_failover, False, |
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self.op.allow_runtime_changes,
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constants.DEFAULT_SHUTDOWN_TIMEOUT, |
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self.op.ignore_ipolicy)
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self.tasklets = [self._migrater] |
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def DeclareLocks(self, level): |
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_DeclareLocksForMigration(self, level)
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def BuildHooksEnv(self): |
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"""Build hooks env.
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This runs on master, primary and secondary nodes of the instance.
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"""
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instance = self._migrater.instance
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source_node = instance.primary_node |
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target_node = self.op.target_node
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env = BuildInstanceHookEnvByObject(self, instance)
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env.update({ |
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"MIGRATE_LIVE": self._migrater.live, |
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"MIGRATE_CLEANUP": self.op.cleanup, |
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"OLD_PRIMARY": source_node,
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"NEW_PRIMARY": target_node,
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"ALLOW_RUNTIME_CHANGES": self.op.allow_runtime_changes, |
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}) |
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if instance.disk_template in constants.DTS_INT_MIRROR: |
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env["OLD_SECONDARY"] = target_node
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env["NEW_SECONDARY"] = source_node
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else:
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env["OLD_SECONDARY"] = env["NEW_SECONDARY"] = None |
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return env
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def BuildHooksNodes(self): |
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"""Build hooks nodes.
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"""
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instance = self._migrater.instance
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snodes = list(instance.secondary_nodes)
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nl = [self.cfg.GetMasterNode(), instance.primary_node] + snodes
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return (nl, nl)
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class TLMigrateInstance(Tasklet): |
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"""Tasklet class for instance migration.
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@type live: boolean
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@ivar live: whether the migration will be done live or non-live;
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this variable is initalized only after CheckPrereq has run
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@type cleanup: boolean
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@ivar cleanup: Wheater we cleanup from a failed migration
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@type iallocator: string
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@ivar iallocator: The iallocator used to determine target_node
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@type target_node: string
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@ivar target_node: If given, the target_node to reallocate the instance to
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@type failover: boolean
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@ivar failover: Whether operation results in failover or migration
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@type fallback: boolean
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@ivar fallback: Whether fallback to failover is allowed if migration not
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possible
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@type ignore_consistency: boolean
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@ivar ignore_consistency: Wheter we should ignore consistency between source
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and target node
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@type shutdown_timeout: int
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@ivar shutdown_timeout: In case of failover timeout of the shutdown
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@type ignore_ipolicy: bool
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@ivar ignore_ipolicy: If true, we can ignore instance policy when migrating
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"""
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# Constants
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_MIGRATION_POLL_INTERVAL = 1 # seconds |
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_MIGRATION_FEEDBACK_INTERVAL = 10 # seconds |
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def __init__(self, lu, instance_name, cleanup, failover, fallback, |
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ignore_consistency, allow_runtime_changes, shutdown_timeout, |
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ignore_ipolicy): |
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"""Initializes this class.
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"""
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Tasklet.__init__(self, lu)
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# Parameters
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self.instance_name = instance_name
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self.cleanup = cleanup
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self.live = False # will be overridden later |
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self.failover = failover
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self.fallback = fallback
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self.ignore_consistency = ignore_consistency
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self.shutdown_timeout = shutdown_timeout
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self.ignore_ipolicy = ignore_ipolicy
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self.allow_runtime_changes = allow_runtime_changes
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def CheckPrereq(self): |
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"""Check prerequisites.
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This checks that the instance is in the cluster.
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"""
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instance_name = ExpandInstanceName(self.lu.cfg, self.instance_name) |
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instance = self.cfg.GetInstanceInfo(instance_name)
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assert instance is not None |
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self.instance = instance
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cluster = self.cfg.GetClusterInfo()
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if (not self.cleanup and |
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not instance.admin_state == constants.ADMINST_UP and |
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not self.failover and self.fallback): |
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self.lu.LogInfo("Instance is marked down or offline, fallback allowed," |
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" switching to failover")
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self.failover = True |
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if instance.disk_template not in constants.DTS_MIRRORED: |
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if self.failover: |
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text = "failovers"
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else:
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text = "migrations"
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raise errors.OpPrereqError("Instance's disk layout '%s' does not allow" |
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" %s" % (instance.disk_template, text),
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errors.ECODE_STATE) |
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if instance.disk_template in constants.DTS_EXT_MIRROR: |
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CheckIAllocatorOrNode(self.lu, "iallocator", "target_node") |
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if self.lu.op.iallocator: |
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assert locking.NAL in self.lu.owned_locks(locking.LEVEL_NODE_ALLOC) |
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self._RunAllocator()
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else:
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# We set set self.target_node as it is required by
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# BuildHooksEnv
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self.target_node = self.lu.op.target_node |
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# Check that the target node is correct in terms of instance policy
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nodeinfo = self.cfg.GetNodeInfo(self.target_node) |
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group_info = self.cfg.GetNodeGroup(nodeinfo.group)
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ipolicy = ganeti.masterd.instance.CalculateGroupIPolicy(cluster, |
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group_info) |
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CheckTargetNodeIPolicy(self.lu, ipolicy, instance, nodeinfo, self.cfg, |
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ignore=self.ignore_ipolicy)
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# self.target_node is already populated, either directly or by the
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# iallocator run
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target_node = self.target_node
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if self.target_node == instance.primary_node: |
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raise errors.OpPrereqError("Cannot migrate instance %s" |
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" to its primary (%s)" %
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(instance.name, instance.primary_node), |
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errors.ECODE_STATE) |
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if len(self.lu.tasklets) == 1: |
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# It is safe to release locks only when we're the only tasklet
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# in the LU
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ReleaseLocks(self.lu, locking.LEVEL_NODE,
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keep=[instance.primary_node, self.target_node])
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ReleaseLocks(self.lu, locking.LEVEL_NODE_ALLOC)
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else:
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assert not self.lu.glm.is_owned(locking.LEVEL_NODE_ALLOC) |
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secondary_nodes = instance.secondary_nodes |
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if not secondary_nodes: |
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raise errors.ConfigurationError("No secondary node but using" |
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" %s disk template" %
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instance.disk_template) |
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target_node = secondary_nodes[0]
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if self.lu.op.iallocator or (self.lu.op.target_node and |
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self.lu.op.target_node != target_node):
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if self.failover: |
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text = "failed over"
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else:
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text = "migrated"
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raise errors.OpPrereqError("Instances with disk template %s cannot" |
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" be %s to arbitrary nodes"
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" (neither an iallocator nor a target"
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" node can be passed)" %
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(instance.disk_template, text), |
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errors.ECODE_INVAL) |
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nodeinfo = self.cfg.GetNodeInfo(target_node)
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group_info = self.cfg.GetNodeGroup(nodeinfo.group)
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ipolicy = ganeti.masterd.instance.CalculateGroupIPolicy(cluster, |
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group_info) |
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CheckTargetNodeIPolicy(self.lu, ipolicy, instance, nodeinfo, self.cfg, |
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ignore=self.ignore_ipolicy)
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i_be = cluster.FillBE(instance) |
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# check memory requirements on the secondary node
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if (not self.cleanup and |
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(not self.failover or instance.admin_state == constants.ADMINST_UP)): |
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self.tgt_free_mem = CheckNodeFreeMemory(
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self.lu, target_node, "migrating instance %s" % instance.name, |
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i_be[constants.BE_MINMEM], instance.hypervisor, |
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self.cfg.GetClusterInfo().hvparams[instance.hypervisor])
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else:
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self.lu.LogInfo("Not checking memory on the secondary node as" |
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" instance will not be started")
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# check if failover must be forced instead of migration
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if (not self.cleanup and not self.failover and |
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i_be[constants.BE_ALWAYS_FAILOVER]): |
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self.lu.LogInfo("Instance configured to always failover; fallback" |
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" to failover")
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self.failover = True |
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# check bridge existance
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CheckInstanceBridgesExist(self.lu, instance, node=target_node)
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if not self.cleanup: |
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CheckNodeNotDrained(self.lu, target_node)
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if not self.failover: |
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result = self.rpc.call_instance_migratable(instance.primary_node,
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instance) |
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if result.fail_msg and self.fallback: |
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self.lu.LogInfo("Can't migrate, instance offline, fallback to" |
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" failover")
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self.failover = True |
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else:
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result.Raise("Can't migrate, please use failover",
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prereq=True, ecode=errors.ECODE_STATE)
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assert not (self.failover and self.cleanup) |
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if not self.failover: |
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if self.lu.op.live is not None and self.lu.op.mode is not None: |
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raise errors.OpPrereqError("Only one of the 'live' and 'mode'" |
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" parameters are accepted",
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errors.ECODE_INVAL) |
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if self.lu.op.live is not None: |
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if self.lu.op.live: |
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self.lu.op.mode = constants.HT_MIGRATION_LIVE
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else:
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self.lu.op.mode = constants.HT_MIGRATION_NONLIVE
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# reset the 'live' parameter to None so that repeated
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# invocations of CheckPrereq do not raise an exception
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self.lu.op.live = None |
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elif self.lu.op.mode is None: |
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# read the default value from the hypervisor
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i_hv = cluster.FillHV(self.instance, skip_globals=False) |
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self.lu.op.mode = i_hv[constants.HV_MIGRATION_MODE]
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self.live = self.lu.op.mode == constants.HT_MIGRATION_LIVE |
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else:
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# Failover is never live
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self.live = False |
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|
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if not (self.failover or self.cleanup): |
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remote_info = self.rpc.call_instance_info(instance.primary_node,
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instance.name, |
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instance.hypervisor) |
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remote_info.Raise("Error checking instance on node %s" %
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instance.primary_node) |
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instance_running = bool(remote_info.payload)
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if instance_running:
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self.current_mem = int(remote_info.payload["memory"]) |
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|
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def _RunAllocator(self): |
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"""Run the allocator based on input opcode.
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|
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"""
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assert locking.NAL in self.lu.owned_locks(locking.LEVEL_NODE_ALLOC) |
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# FIXME: add a self.ignore_ipolicy option
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req = iallocator.IAReqRelocate(name=self.instance_name,
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relocate_from=[self.instance.primary_node])
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ial = iallocator.IAllocator(self.cfg, self.rpc, req) |
449 |
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ial.Run(self.lu.op.iallocator)
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|
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if not ial.success: |
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raise errors.OpPrereqError("Can't compute nodes using" |
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" iallocator '%s': %s" %
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(self.lu.op.iallocator, ial.info),
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errors.ECODE_NORES) |
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self.target_node = ial.result[0] |
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self.lu.LogInfo("Selected nodes for instance %s via iallocator %s: %s", |
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self.instance_name, self.lu.op.iallocator, |
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utils.CommaJoin(ial.result)) |
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|
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def _WaitUntilSync(self): |
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"""Poll with custom rpc for disk sync.
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|
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This uses our own step-based rpc call.
|
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|
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"""
|
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self.feedback_fn("* wait until resync is done") |
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all_done = False
|
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while not all_done: |
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all_done = True
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result = self.rpc.call_drbd_wait_sync(self.all_nodes, |
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self.nodes_ip,
|
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(self.instance.disks,
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self.instance))
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min_percent = 100
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for node, nres in result.items(): |
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nres.Raise("Cannot resync disks on node %s" % node)
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node_done, node_percent = nres.payload |
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all_done = all_done and node_done
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if node_percent is not None: |
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min_percent = min(min_percent, node_percent)
|
483 |
if not all_done: |
484 |
if min_percent < 100: |
485 |
self.feedback_fn(" - progress: %.1f%%" % min_percent) |
486 |
time.sleep(2)
|
487 |
|
488 |
def _EnsureSecondary(self, node): |
489 |
"""Demote a node to secondary.
|
490 |
|
491 |
"""
|
492 |
self.feedback_fn("* switching node %s to secondary mode" % node) |
493 |
|
494 |
for dev in self.instance.disks: |
495 |
self.cfg.SetDiskID(dev, node)
|
496 |
|
497 |
result = self.rpc.call_blockdev_close(node, self.instance.name, |
498 |
self.instance.disks)
|
499 |
result.Raise("Cannot change disk to secondary on node %s" % node)
|
500 |
|
501 |
def _GoStandalone(self): |
502 |
"""Disconnect from the network.
|
503 |
|
504 |
"""
|
505 |
self.feedback_fn("* changing into standalone mode") |
506 |
result = self.rpc.call_drbd_disconnect_net(self.all_nodes, self.nodes_ip, |
507 |
self.instance.disks)
|
508 |
for node, nres in result.items(): |
509 |
nres.Raise("Cannot disconnect disks node %s" % node)
|
510 |
|
511 |
def _GoReconnect(self, multimaster): |
512 |
"""Reconnect to the network.
|
513 |
|
514 |
"""
|
515 |
if multimaster:
|
516 |
msg = "dual-master"
|
517 |
else:
|
518 |
msg = "single-master"
|
519 |
self.feedback_fn("* changing disks into %s mode" % msg) |
520 |
result = self.rpc.call_drbd_attach_net(self.all_nodes, self.nodes_ip, |
521 |
(self.instance.disks, self.instance), |
522 |
self.instance.name, multimaster)
|
523 |
for node, nres in result.items(): |
524 |
nres.Raise("Cannot change disks config on node %s" % node)
|
525 |
|
526 |
def _ExecCleanup(self): |
527 |
"""Try to cleanup after a failed migration.
|
528 |
|
529 |
The cleanup is done by:
|
530 |
- check that the instance is running only on one node
|
531 |
(and update the config if needed)
|
532 |
- change disks on its secondary node to secondary
|
533 |
- wait until disks are fully synchronized
|
534 |
- disconnect from the network
|
535 |
- change disks into single-master mode
|
536 |
- wait again until disks are fully synchronized
|
537 |
|
538 |
"""
|
539 |
instance = self.instance
|
540 |
target_node = self.target_node
|
541 |
source_node = self.source_node
|
542 |
|
543 |
# check running on only one node
|
544 |
self.feedback_fn("* checking where the instance actually runs" |
545 |
" (if this hangs, the hypervisor might be in"
|
546 |
" a bad state)")
|
547 |
cluster_hvparams = self.cfg.GetClusterInfo().hvparams
|
548 |
ins_l = self.rpc.call_instance_list(self.all_nodes, [instance.hypervisor], |
549 |
cluster_hvparams) |
550 |
for node, result in ins_l.items(): |
551 |
result.Raise("Can't contact node %s" % node)
|
552 |
|
553 |
runningon_source = instance.name in ins_l[source_node].payload
|
554 |
runningon_target = instance.name in ins_l[target_node].payload
|
555 |
|
556 |
if runningon_source and runningon_target: |
557 |
raise errors.OpExecError("Instance seems to be running on two nodes," |
558 |
" or the hypervisor is confused; you will have"
|
559 |
" to ensure manually that it runs only on one"
|
560 |
" and restart this operation")
|
561 |
|
562 |
if not (runningon_source or runningon_target): |
563 |
raise errors.OpExecError("Instance does not seem to be running at all;" |
564 |
" in this case it's safer to repair by"
|
565 |
" running 'gnt-instance stop' to ensure disk"
|
566 |
" shutdown, and then restarting it")
|
567 |
|
568 |
if runningon_target:
|
569 |
# the migration has actually succeeded, we need to update the config
|
570 |
self.feedback_fn("* instance running on secondary node (%s)," |
571 |
" updating config" % target_node)
|
572 |
instance.primary_node = target_node |
573 |
self.cfg.Update(instance, self.feedback_fn) |
574 |
demoted_node = source_node |
575 |
else:
|
576 |
self.feedback_fn("* instance confirmed to be running on its" |
577 |
" primary node (%s)" % source_node)
|
578 |
demoted_node = target_node |
579 |
|
580 |
if instance.disk_template in constants.DTS_INT_MIRROR: |
581 |
self._EnsureSecondary(demoted_node)
|
582 |
try:
|
583 |
self._WaitUntilSync()
|
584 |
except errors.OpExecError:
|
585 |
# we ignore here errors, since if the device is standalone, it
|
586 |
# won't be able to sync
|
587 |
pass
|
588 |
self._GoStandalone()
|
589 |
self._GoReconnect(False) |
590 |
self._WaitUntilSync()
|
591 |
|
592 |
self.feedback_fn("* done") |
593 |
|
594 |
def _RevertDiskStatus(self): |
595 |
"""Try to revert the disk status after a failed migration.
|
596 |
|
597 |
"""
|
598 |
target_node = self.target_node
|
599 |
if self.instance.disk_template in constants.DTS_EXT_MIRROR: |
600 |
return
|
601 |
|
602 |
try:
|
603 |
self._EnsureSecondary(target_node)
|
604 |
self._GoStandalone()
|
605 |
self._GoReconnect(False) |
606 |
self._WaitUntilSync()
|
607 |
except errors.OpExecError, err:
|
608 |
self.lu.LogWarning("Migration failed and I can't reconnect the drives," |
609 |
" please try to recover the instance manually;"
|
610 |
" error '%s'" % str(err)) |
611 |
|
612 |
def _AbortMigration(self): |
613 |
"""Call the hypervisor code to abort a started migration.
|
614 |
|
615 |
"""
|
616 |
instance = self.instance
|
617 |
target_node = self.target_node
|
618 |
source_node = self.source_node
|
619 |
migration_info = self.migration_info
|
620 |
|
621 |
abort_result = self.rpc.call_instance_finalize_migration_dst(target_node,
|
622 |
instance, |
623 |
migration_info, |
624 |
False)
|
625 |
abort_msg = abort_result.fail_msg |
626 |
if abort_msg:
|
627 |
logging.error("Aborting migration failed on target node %s: %s",
|
628 |
target_node, abort_msg) |
629 |
# Don't raise an exception here, as we stil have to try to revert the
|
630 |
# disk status, even if this step failed.
|
631 |
|
632 |
abort_result = self.rpc.call_instance_finalize_migration_src(
|
633 |
source_node, instance, False, self.live) |
634 |
abort_msg = abort_result.fail_msg |
635 |
if abort_msg:
|
636 |
logging.error("Aborting migration failed on source node %s: %s",
|
637 |
source_node, abort_msg) |
638 |
|
639 |
def _ExecMigration(self): |
640 |
"""Migrate an instance.
|
641 |
|
642 |
The migrate is done by:
|
643 |
- change the disks into dual-master mode
|
644 |
- wait until disks are fully synchronized again
|
645 |
- migrate the instance
|
646 |
- change disks on the new secondary node (the old primary) to secondary
|
647 |
- wait until disks are fully synchronized
|
648 |
- change disks into single-master mode
|
649 |
|
650 |
"""
|
651 |
instance = self.instance
|
652 |
target_node = self.target_node
|
653 |
source_node = self.source_node
|
654 |
|
655 |
# Check for hypervisor version mismatch and warn the user.
|
656 |
hvspecs = [(instance.hypervisor, |
657 |
self.cfg.GetClusterInfo().hvparams[instance.hypervisor])]
|
658 |
nodeinfo = self.rpc.call_node_info([source_node, target_node],
|
659 |
None, hvspecs, False) |
660 |
for ninfo in nodeinfo.values(): |
661 |
ninfo.Raise("Unable to retrieve node information from node '%s'" %
|
662 |
ninfo.node) |
663 |
(_, _, (src_info, )) = nodeinfo[source_node].payload |
664 |
(_, _, (dst_info, )) = nodeinfo[target_node].payload |
665 |
|
666 |
if ((constants.HV_NODEINFO_KEY_VERSION in src_info) and |
667 |
(constants.HV_NODEINFO_KEY_VERSION in dst_info)):
|
668 |
src_version = src_info[constants.HV_NODEINFO_KEY_VERSION] |
669 |
dst_version = dst_info[constants.HV_NODEINFO_KEY_VERSION] |
670 |
if src_version != dst_version:
|
671 |
self.feedback_fn("* warning: hypervisor version mismatch between" |
672 |
" source (%s) and target (%s) node" %
|
673 |
(src_version, dst_version)) |
674 |
|
675 |
self.feedback_fn("* checking disk consistency between source and target") |
676 |
for (idx, dev) in enumerate(instance.disks): |
677 |
if not CheckDiskConsistency(self.lu, instance, dev, target_node, False): |
678 |
raise errors.OpExecError("Disk %s is degraded or not fully" |
679 |
" synchronized on target node,"
|
680 |
" aborting migration" % idx)
|
681 |
|
682 |
if self.current_mem > self.tgt_free_mem: |
683 |
if not self.allow_runtime_changes: |
684 |
raise errors.OpExecError("Memory ballooning not allowed and not enough" |
685 |
" free memory to fit instance %s on target"
|
686 |
" node %s (have %dMB, need %dMB)" %
|
687 |
(instance.name, target_node, |
688 |
self.tgt_free_mem, self.current_mem)) |
689 |
self.feedback_fn("* setting instance memory to %s" % self.tgt_free_mem) |
690 |
rpcres = self.rpc.call_instance_balloon_memory(instance.primary_node,
|
691 |
instance, |
692 |
self.tgt_free_mem)
|
693 |
rpcres.Raise("Cannot modify instance runtime memory")
|
694 |
|
695 |
# First get the migration information from the remote node
|
696 |
result = self.rpc.call_migration_info(source_node, instance)
|
697 |
msg = result.fail_msg |
698 |
if msg:
|
699 |
log_err = ("Failed fetching source migration information from %s: %s" %
|
700 |
(source_node, msg)) |
701 |
logging.error(log_err) |
702 |
raise errors.OpExecError(log_err)
|
703 |
|
704 |
self.migration_info = migration_info = result.payload
|
705 |
|
706 |
if self.instance.disk_template not in constants.DTS_EXT_MIRROR: |
707 |
# Then switch the disks to master/master mode
|
708 |
self._EnsureSecondary(target_node)
|
709 |
self._GoStandalone()
|
710 |
self._GoReconnect(True) |
711 |
self._WaitUntilSync()
|
712 |
|
713 |
self.feedback_fn("* preparing %s to accept the instance" % target_node) |
714 |
result = self.rpc.call_accept_instance(target_node,
|
715 |
instance, |
716 |
migration_info, |
717 |
self.nodes_ip[target_node])
|
718 |
|
719 |
msg = result.fail_msg |
720 |
if msg:
|
721 |
logging.error("Instance pre-migration failed, trying to revert"
|
722 |
" disk status: %s", msg)
|
723 |
self.feedback_fn("Pre-migration failed, aborting") |
724 |
self._AbortMigration()
|
725 |
self._RevertDiskStatus()
|
726 |
raise errors.OpExecError("Could not pre-migrate instance %s: %s" % |
727 |
(instance.name, msg)) |
728 |
|
729 |
self.feedback_fn("* migrating instance to %s" % target_node) |
730 |
result = self.rpc.call_instance_migrate(source_node, instance,
|
731 |
self.nodes_ip[target_node],
|
732 |
self.live)
|
733 |
msg = result.fail_msg |
734 |
if msg:
|
735 |
logging.error("Instance migration failed, trying to revert"
|
736 |
" disk status: %s", msg)
|
737 |
self.feedback_fn("Migration failed, aborting") |
738 |
self._AbortMigration()
|
739 |
self._RevertDiskStatus()
|
740 |
raise errors.OpExecError("Could not migrate instance %s: %s" % |
741 |
(instance.name, msg)) |
742 |
|
743 |
self.feedback_fn("* starting memory transfer") |
744 |
last_feedback = time.time() |
745 |
while True: |
746 |
result = self.rpc.call_instance_get_migration_status(source_node,
|
747 |
instance) |
748 |
msg = result.fail_msg |
749 |
ms = result.payload # MigrationStatus instance
|
750 |
if msg or (ms.status in constants.HV_MIGRATION_FAILED_STATUSES): |
751 |
logging.error("Instance migration failed, trying to revert"
|
752 |
" disk status: %s", msg)
|
753 |
self.feedback_fn("Migration failed, aborting") |
754 |
self._AbortMigration()
|
755 |
self._RevertDiskStatus()
|
756 |
if not msg: |
757 |
msg = "hypervisor returned failure"
|
758 |
raise errors.OpExecError("Could not migrate instance %s: %s" % |
759 |
(instance.name, msg)) |
760 |
|
761 |
if result.payload.status != constants.HV_MIGRATION_ACTIVE:
|
762 |
self.feedback_fn("* memory transfer complete") |
763 |
break
|
764 |
|
765 |
if (utils.TimeoutExpired(last_feedback,
|
766 |
self._MIGRATION_FEEDBACK_INTERVAL) and |
767 |
ms.transferred_ram is not None): |
768 |
mem_progress = 100 * float(ms.transferred_ram) / float(ms.total_ram) |
769 |
self.feedback_fn("* memory transfer progress: %.2f %%" % mem_progress) |
770 |
last_feedback = time.time() |
771 |
|
772 |
time.sleep(self._MIGRATION_POLL_INTERVAL)
|
773 |
|
774 |
result = self.rpc.call_instance_finalize_migration_src(source_node,
|
775 |
instance, |
776 |
True,
|
777 |
self.live)
|
778 |
msg = result.fail_msg |
779 |
if msg:
|
780 |
logging.error("Instance migration succeeded, but finalization failed"
|
781 |
" on the source node: %s", msg)
|
782 |
raise errors.OpExecError("Could not finalize instance migration: %s" % |
783 |
msg) |
784 |
|
785 |
instance.primary_node = target_node |
786 |
|
787 |
# distribute new instance config to the other nodes
|
788 |
self.cfg.Update(instance, self.feedback_fn) |
789 |
|
790 |
result = self.rpc.call_instance_finalize_migration_dst(target_node,
|
791 |
instance, |
792 |
migration_info, |
793 |
True)
|
794 |
msg = result.fail_msg |
795 |
if msg:
|
796 |
logging.error("Instance migration succeeded, but finalization failed"
|
797 |
" on the target node: %s", msg)
|
798 |
raise errors.OpExecError("Could not finalize instance migration: %s" % |
799 |
msg) |
800 |
|
801 |
if self.instance.disk_template not in constants.DTS_EXT_MIRROR: |
802 |
self._EnsureSecondary(source_node)
|
803 |
self._WaitUntilSync()
|
804 |
self._GoStandalone()
|
805 |
self._GoReconnect(False) |
806 |
self._WaitUntilSync()
|
807 |
|
808 |
# If the instance's disk template is `rbd' or `ext' and there was a
|
809 |
# successful migration, unmap the device from the source node.
|
810 |
if self.instance.disk_template in (constants.DT_RBD, constants.DT_EXT): |
811 |
disks = ExpandCheckDisks(instance, instance.disks) |
812 |
self.feedback_fn("* unmapping instance's disks from %s" % source_node) |
813 |
for disk in disks: |
814 |
result = self.rpc.call_blockdev_shutdown(source_node, (disk, instance))
|
815 |
msg = result.fail_msg |
816 |
if msg:
|
817 |
logging.error("Migration was successful, but couldn't unmap the"
|
818 |
" block device %s on source node %s: %s",
|
819 |
disk.iv_name, source_node, msg) |
820 |
logging.error("You need to unmap the device %s manually on %s",
|
821 |
disk.iv_name, source_node) |
822 |
|
823 |
self.feedback_fn("* done") |
824 |
|
825 |
def _ExecFailover(self): |
826 |
"""Failover an instance.
|
827 |
|
828 |
The failover is done by shutting it down on its present node and
|
829 |
starting it on the secondary.
|
830 |
|
831 |
"""
|
832 |
instance = self.instance
|
833 |
primary_node = self.cfg.GetNodeInfo(instance.primary_node)
|
834 |
|
835 |
source_node = instance.primary_node |
836 |
target_node = self.target_node
|
837 |
|
838 |
if instance.disks_active:
|
839 |
self.feedback_fn("* checking disk consistency between source and target") |
840 |
for (idx, dev) in enumerate(instance.disks): |
841 |
# for drbd, these are drbd over lvm
|
842 |
if not CheckDiskConsistency(self.lu, instance, dev, target_node, |
843 |
False):
|
844 |
if primary_node.offline:
|
845 |
self.feedback_fn("Node %s is offline, ignoring degraded disk %s on" |
846 |
" target node %s" %
|
847 |
(primary_node.name, idx, target_node)) |
848 |
elif not self.ignore_consistency: |
849 |
raise errors.OpExecError("Disk %s is degraded on target node," |
850 |
" aborting failover" % idx)
|
851 |
else:
|
852 |
self.feedback_fn("* not checking disk consistency as instance is not" |
853 |
" running")
|
854 |
|
855 |
self.feedback_fn("* shutting down instance on source node") |
856 |
logging.info("Shutting down instance %s on node %s",
|
857 |
instance.name, source_node) |
858 |
|
859 |
result = self.rpc.call_instance_shutdown(source_node, instance,
|
860 |
self.shutdown_timeout,
|
861 |
self.lu.op.reason)
|
862 |
msg = result.fail_msg |
863 |
if msg:
|
864 |
if self.ignore_consistency or primary_node.offline: |
865 |
self.lu.LogWarning("Could not shutdown instance %s on node %s," |
866 |
" proceeding anyway; please make sure node"
|
867 |
" %s is down; error details: %s",
|
868 |
instance.name, source_node, source_node, msg) |
869 |
else:
|
870 |
raise errors.OpExecError("Could not shutdown instance %s on" |
871 |
" node %s: %s" %
|
872 |
(instance.name, source_node, msg)) |
873 |
|
874 |
self.feedback_fn("* deactivating the instance's disks on source node") |
875 |
if not ShutdownInstanceDisks(self.lu, instance, ignore_primary=True): |
876 |
raise errors.OpExecError("Can't shut down the instance's disks") |
877 |
|
878 |
instance.primary_node = target_node |
879 |
# distribute new instance config to the other nodes
|
880 |
self.cfg.Update(instance, self.feedback_fn) |
881 |
|
882 |
# Only start the instance if it's marked as up
|
883 |
if instance.admin_state == constants.ADMINST_UP:
|
884 |
self.feedback_fn("* activating the instance's disks on target node %s" % |
885 |
target_node) |
886 |
logging.info("Starting instance %s on node %s",
|
887 |
instance.name, target_node) |
888 |
|
889 |
disks_ok, _ = AssembleInstanceDisks(self.lu, instance,
|
890 |
ignore_secondaries=True)
|
891 |
if not disks_ok: |
892 |
ShutdownInstanceDisks(self.lu, instance)
|
893 |
raise errors.OpExecError("Can't activate the instance's disks") |
894 |
|
895 |
self.feedback_fn("* starting the instance on the target node %s" % |
896 |
target_node) |
897 |
result = self.rpc.call_instance_start(target_node, (instance, None, None), |
898 |
False, self.lu.op.reason) |
899 |
msg = result.fail_msg |
900 |
if msg:
|
901 |
ShutdownInstanceDisks(self.lu, instance)
|
902 |
raise errors.OpExecError("Could not start instance %s on node %s: %s" % |
903 |
(instance.name, target_node, msg)) |
904 |
|
905 |
def Exec(self, feedback_fn): |
906 |
"""Perform the migration.
|
907 |
|
908 |
"""
|
909 |
self.feedback_fn = feedback_fn
|
910 |
self.source_node = self.instance.primary_node |
911 |
|
912 |
# FIXME: if we implement migrate-to-any in DRBD, this needs fixing
|
913 |
if self.instance.disk_template in constants.DTS_INT_MIRROR: |
914 |
self.target_node = self.instance.secondary_nodes[0] |
915 |
# Otherwise self.target_node has been populated either
|
916 |
# directly, or through an iallocator.
|
917 |
|
918 |
self.all_nodes = [self.source_node, self.target_node] |
919 |
self.nodes_ip = dict((name, node.secondary_ip) for (name, node) |
920 |
in self.cfg.GetMultiNodeInfo(self.all_nodes)) |
921 |
|
922 |
if self.failover: |
923 |
feedback_fn("Failover instance %s" % self.instance.name) |
924 |
self._ExecFailover()
|
925 |
else:
|
926 |
feedback_fn("Migrating instance %s" % self.instance.name) |
927 |
|
928 |
if self.cleanup: |
929 |
return self._ExecCleanup() |
930 |
else:
|
931 |
return self._ExecMigration() |