root / lib / cmdlib / instance_migration.py @ 9f7d5fe4
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#
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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 ExpandInstanceUuidAndName, \ |
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CheckIAllocatorOrNode, ExpandNodeUuidAndName |
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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_uuid, lu.op.target_node) = \ |
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ExpandNodeUuidAndName(lu.cfg, lu.op.target_node_uuid, 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_uuid) |
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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_uuid] |
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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_uuid, self.op.instance_name, |
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False, True, False, 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_uuid = instance.primary_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": self.cfg.GetNodeName(source_node_uuid), |
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"NEW_PRIMARY": self.op.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"] = self.cfg.GetNodeName(instance.secondary_nodes[0]) |
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env["NEW_SECONDARY"] = self.cfg.GetNodeName(source_node_uuid) |
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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_uuid, self.op.instance_name, |
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self.op.cleanup, 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_uuid = instance.primary_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": self.cfg.GetNodeName(source_node_uuid), |
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"NEW_PRIMARY": self.op.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"] = self.cfg.GetNodeName(instance.secondary_nodes[0]) |
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env["NEW_SECONDARY"] = self.cfg.GetNodeName(source_node_uuid) |
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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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snode_uuids = list(instance.secondary_nodes)
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nl = [self.cfg.GetMasterNode(), instance.primary_node] + snode_uuids
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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_uuid: string
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@ivar target_node_uuid: If given, the target node UUID to reallocate the
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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_uuid, instance_name, cleanup, failover, |
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fallback, ignore_consistency, allow_runtime_changes, |
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shutdown_timeout, 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_uuid = instance_uuid
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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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(self.instance_uuid, self.instance_name) = \ |
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ExpandInstanceUuidAndName(self.lu.cfg, self.instance_uuid, |
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self.instance_name)
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self.instance = self.cfg.GetInstanceInfo(self.instance_uuid) |
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assert self.instance is not None |
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cluster = self.cfg.GetClusterInfo()
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if (not self.cleanup and |
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not self.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 self.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" % (self.instance.disk_template, text), |
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errors.ECODE_STATE) |
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if self.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_uuid as it is required by
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# BuildHooksEnv
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self.target_node_uuid = self.lu.op.target_node_uuid |
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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_uuid) |
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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, self.instance, nodeinfo, |
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self.cfg, 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_uuid = self.target_node_uuid
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if self.target_node_uuid == self.instance.primary_node: |
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raise errors.OpPrereqError(
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"Cannot migrate instance %s to its primary (%s)" %
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(self.instance.name,
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self.cfg.GetNodeName(self.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=[self.instance.primary_node, self.target_node_uuid]) |
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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_node_uuids = self.instance.secondary_nodes
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if not secondary_node_uuids: |
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raise errors.ConfigurationError("No secondary node but using" |
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" %s disk template" %
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self.instance.disk_template)
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target_node_uuid = secondary_node_uuids[0]
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if self.lu.op.iallocator or \ |
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(self.lu.op.target_node_uuid and |
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self.lu.op.target_node_uuid != target_node_uuid):
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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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(self.instance.disk_template, text),
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errors.ECODE_INVAL) |
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nodeinfo = self.cfg.GetNodeInfo(target_node_uuid)
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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, self.instance, nodeinfo, |
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self.cfg, ignore=self.ignore_ipolicy) |
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i_be = cluster.FillBE(self.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 |
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self.instance.admin_state == constants.ADMINST_UP)):
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self.tgt_free_mem = CheckNodeFreeMemory(
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self.lu, target_node_uuid,
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"migrating instance %s" % self.instance.name, |
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i_be[constants.BE_MINMEM], self.instance.hypervisor,
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self.cfg.GetClusterInfo().hvparams[self.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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|
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# check bridge existance
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CheckInstanceBridgesExist(self.lu, self.instance, |
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node_uuid=target_node_uuid) |
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|
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if not self.cleanup: |
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CheckNodeNotDrained(self.lu, target_node_uuid)
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if not self.failover: |
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result = self.rpc.call_instance_migratable(self.instance.primary_node, |
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self.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(
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self.instance.primary_node, self.instance.name, |
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self.instance.hypervisor, cluster.hvparams[self.instance.hypervisor]) |
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remote_info.Raise("Error checking instance on node %s" %
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self.cfg.GetNodeName(self.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): |
| 447 |
"""Run the allocator based on input opcode.
|
| 448 |
|
| 449 |
"""
|
| 450 |
assert locking.NAL in self.lu.owned_locks(locking.LEVEL_NODE_ALLOC) |
| 451 |
|
| 452 |
# FIXME: add a self.ignore_ipolicy option
|
| 453 |
req = iallocator.IAReqRelocate( |
| 454 |
inst_uuid=self.instance_uuid,
|
| 455 |
relocate_from_node_uuids=[self.instance.primary_node])
|
| 456 |
ial = iallocator.IAllocator(self.cfg, self.rpc, req) |
| 457 |
|
| 458 |
ial.Run(self.lu.op.iallocator)
|
| 459 |
|
| 460 |
if not ial.success: |
| 461 |
raise errors.OpPrereqError("Can't compute nodes using" |
| 462 |
" iallocator '%s': %s" %
|
| 463 |
(self.lu.op.iallocator, ial.info),
|
| 464 |
errors.ECODE_NORES) |
| 465 |
self.target_node_uuid = self.cfg.GetNodeInfoByName(ial.result[0]).uuid |
| 466 |
self.lu.LogInfo("Selected nodes for instance %s via iallocator %s: %s", |
| 467 |
self.instance_name, self.lu.op.iallocator, |
| 468 |
utils.CommaJoin(ial.result)) |
| 469 |
|
| 470 |
def _WaitUntilSync(self): |
| 471 |
"""Poll with custom rpc for disk sync.
|
| 472 |
|
| 473 |
This uses our own step-based rpc call.
|
| 474 |
|
| 475 |
"""
|
| 476 |
self.feedback_fn("* wait until resync is done") |
| 477 |
all_done = False
|
| 478 |
while not all_done: |
| 479 |
all_done = True
|
| 480 |
result = self.rpc.call_drbd_wait_sync(self.all_node_uuids, |
| 481 |
self.nodes_ip,
|
| 482 |
(self.instance.disks,
|
| 483 |
self.instance))
|
| 484 |
min_percent = 100
|
| 485 |
for node_uuid, nres in result.items(): |
| 486 |
nres.Raise("Cannot resync disks on node %s" %
|
| 487 |
self.cfg.GetNodeName(node_uuid))
|
| 488 |
node_done, node_percent = nres.payload |
| 489 |
all_done = all_done and node_done
|
| 490 |
if node_percent is not None: |
| 491 |
min_percent = min(min_percent, node_percent)
|
| 492 |
if not all_done: |
| 493 |
if min_percent < 100: |
| 494 |
self.feedback_fn(" - progress: %.1f%%" % min_percent) |
| 495 |
time.sleep(2)
|
| 496 |
|
| 497 |
def _EnsureSecondary(self, node_uuid): |
| 498 |
"""Demote a node to secondary.
|
| 499 |
|
| 500 |
"""
|
| 501 |
self.feedback_fn("* switching node %s to secondary mode" % |
| 502 |
self.cfg.GetNodeName(node_uuid))
|
| 503 |
|
| 504 |
for dev in self.instance.disks: |
| 505 |
self.cfg.SetDiskID(dev, node_uuid)
|
| 506 |
|
| 507 |
result = self.rpc.call_blockdev_close(node_uuid, self.instance.name, |
| 508 |
self.instance.disks)
|
| 509 |
result.Raise("Cannot change disk to secondary on node %s" %
|
| 510 |
self.cfg.GetNodeName(node_uuid))
|
| 511 |
|
| 512 |
def _GoStandalone(self): |
| 513 |
"""Disconnect from the network.
|
| 514 |
|
| 515 |
"""
|
| 516 |
self.feedback_fn("* changing into standalone mode") |
| 517 |
result = self.rpc.call_drbd_disconnect_net(self.all_node_uuids, |
| 518 |
self.nodes_ip,
|
| 519 |
self.instance.disks)
|
| 520 |
for node_uuid, nres in result.items(): |
| 521 |
nres.Raise("Cannot disconnect disks node %s" %
|
| 522 |
self.cfg.GetNodeName(node_uuid))
|
| 523 |
|
| 524 |
def _GoReconnect(self, multimaster): |
| 525 |
"""Reconnect to the network.
|
| 526 |
|
| 527 |
"""
|
| 528 |
if multimaster:
|
| 529 |
msg = "dual-master"
|
| 530 |
else:
|
| 531 |
msg = "single-master"
|
| 532 |
self.feedback_fn("* changing disks into %s mode" % msg) |
| 533 |
result = self.rpc.call_drbd_attach_net(self.all_node_uuids, self.nodes_ip, |
| 534 |
(self.instance.disks, self.instance), |
| 535 |
self.instance.name, multimaster)
|
| 536 |
for node_uuid, nres in result.items(): |
| 537 |
nres.Raise("Cannot change disks config on node %s" %
|
| 538 |
self.cfg.GetNodeName(node_uuid))
|
| 539 |
|
| 540 |
def _ExecCleanup(self): |
| 541 |
"""Try to cleanup after a failed migration.
|
| 542 |
|
| 543 |
The cleanup is done by:
|
| 544 |
- check that the instance is running only on one node
|
| 545 |
(and update the config if needed)
|
| 546 |
- change disks on its secondary node to secondary
|
| 547 |
- wait until disks are fully synchronized
|
| 548 |
- disconnect from the network
|
| 549 |
- change disks into single-master mode
|
| 550 |
- wait again until disks are fully synchronized
|
| 551 |
|
| 552 |
"""
|
| 553 |
# check running on only one node
|
| 554 |
self.feedback_fn("* checking where the instance actually runs" |
| 555 |
" (if this hangs, the hypervisor might be in"
|
| 556 |
" a bad state)")
|
| 557 |
cluster_hvparams = self.cfg.GetClusterInfo().hvparams
|
| 558 |
ins_l = self.rpc.call_instance_list(self.all_node_uuids, |
| 559 |
[self.instance.hypervisor],
|
| 560 |
cluster_hvparams) |
| 561 |
for node_uuid, result in ins_l.items(): |
| 562 |
result.Raise("Can't contact node %s" % node_uuid)
|
| 563 |
|
| 564 |
runningon_source = self.instance.name in \ |
| 565 |
ins_l[self.source_node_uuid].payload
|
| 566 |
runningon_target = self.instance.name in \ |
| 567 |
ins_l[self.target_node_uuid].payload
|
| 568 |
|
| 569 |
if runningon_source and runningon_target: |
| 570 |
raise errors.OpExecError("Instance seems to be running on two nodes," |
| 571 |
" or the hypervisor is confused; you will have"
|
| 572 |
" to ensure manually that it runs only on one"
|
| 573 |
" and restart this operation")
|
| 574 |
|
| 575 |
if not (runningon_source or runningon_target): |
| 576 |
raise errors.OpExecError("Instance does not seem to be running at all;" |
| 577 |
" in this case it's safer to repair by"
|
| 578 |
" running 'gnt-instance stop' to ensure disk"
|
| 579 |
" shutdown, and then restarting it")
|
| 580 |
|
| 581 |
if runningon_target:
|
| 582 |
# the migration has actually succeeded, we need to update the config
|
| 583 |
self.feedback_fn("* instance running on secondary node (%s)," |
| 584 |
" updating config" %
|
| 585 |
self.cfg.GetNodeName(self.target_node_uuid)) |
| 586 |
self.instance.primary_node = self.target_node_uuid |
| 587 |
self.cfg.Update(self.instance, self.feedback_fn) |
| 588 |
demoted_node_uuid = self.source_node_uuid
|
| 589 |
else:
|
| 590 |
self.feedback_fn("* instance confirmed to be running on its" |
| 591 |
" primary node (%s)" %
|
| 592 |
self.cfg.GetNodeName(self.source_node_uuid)) |
| 593 |
demoted_node_uuid = self.target_node_uuid
|
| 594 |
|
| 595 |
if self.instance.disk_template in constants.DTS_INT_MIRROR: |
| 596 |
self._EnsureSecondary(demoted_node_uuid)
|
| 597 |
try:
|
| 598 |
self._WaitUntilSync()
|
| 599 |
except errors.OpExecError:
|
| 600 |
# we ignore here errors, since if the device is standalone, it
|
| 601 |
# won't be able to sync
|
| 602 |
pass
|
| 603 |
self._GoStandalone()
|
| 604 |
self._GoReconnect(False) |
| 605 |
self._WaitUntilSync()
|
| 606 |
|
| 607 |
self.feedback_fn("* done") |
| 608 |
|
| 609 |
def _RevertDiskStatus(self): |
| 610 |
"""Try to revert the disk status after a failed migration.
|
| 611 |
|
| 612 |
"""
|
| 613 |
if self.instance.disk_template in constants.DTS_EXT_MIRROR: |
| 614 |
return
|
| 615 |
|
| 616 |
try:
|
| 617 |
self._EnsureSecondary(self.target_node_uuid) |
| 618 |
self._GoStandalone()
|
| 619 |
self._GoReconnect(False) |
| 620 |
self._WaitUntilSync()
|
| 621 |
except errors.OpExecError, err:
|
| 622 |
self.lu.LogWarning("Migration failed and I can't reconnect the drives," |
| 623 |
" please try to recover the instance manually;"
|
| 624 |
" error '%s'" % str(err)) |
| 625 |
|
| 626 |
def _AbortMigration(self): |
| 627 |
"""Call the hypervisor code to abort a started migration.
|
| 628 |
|
| 629 |
"""
|
| 630 |
abort_result = self.rpc.call_instance_finalize_migration_dst(
|
| 631 |
self.target_node_uuid, self.instance, self.migration_info, |
| 632 |
False)
|
| 633 |
abort_msg = abort_result.fail_msg |
| 634 |
if abort_msg:
|
| 635 |
logging.error("Aborting migration failed on target node %s: %s",
|
| 636 |
self.cfg.GetNodeName(self.target_node_uuid), abort_msg) |
| 637 |
# Don't raise an exception here, as we stil have to try to revert the
|
| 638 |
# disk status, even if this step failed.
|
| 639 |
|
| 640 |
abort_result = self.rpc.call_instance_finalize_migration_src(
|
| 641 |
self.source_node_uuid, self.instance, False, self.live) |
| 642 |
abort_msg = abort_result.fail_msg |
| 643 |
if abort_msg:
|
| 644 |
logging.error("Aborting migration failed on source node %s: %s",
|
| 645 |
self.cfg.GetNodeName(self.source_node_uuid), abort_msg) |
| 646 |
|
| 647 |
def _ExecMigration(self): |
| 648 |
"""Migrate an instance.
|
| 649 |
|
| 650 |
The migrate is done by:
|
| 651 |
- change the disks into dual-master mode
|
| 652 |
- wait until disks are fully synchronized again
|
| 653 |
- migrate the instance
|
| 654 |
- change disks on the new secondary node (the old primary) to secondary
|
| 655 |
- wait until disks are fully synchronized
|
| 656 |
- change disks into single-master mode
|
| 657 |
|
| 658 |
"""
|
| 659 |
# Check for hypervisor version mismatch and warn the user.
|
| 660 |
hvspecs = [(self.instance.hypervisor,
|
| 661 |
self.cfg.GetClusterInfo().hvparams[self.instance.hypervisor])] |
| 662 |
nodeinfo = self.rpc.call_node_info(
|
| 663 |
[self.source_node_uuid, self.target_node_uuid], None, hvspecs) |
| 664 |
for ninfo in nodeinfo.values(): |
| 665 |
ninfo.Raise("Unable to retrieve node information from node '%s'" %
|
| 666 |
ninfo.node) |
| 667 |
(_, _, (src_info, )) = nodeinfo[self.source_node_uuid].payload
|
| 668 |
(_, _, (dst_info, )) = nodeinfo[self.target_node_uuid].payload
|
| 669 |
|
| 670 |
if ((constants.HV_NODEINFO_KEY_VERSION in src_info) and |
| 671 |
(constants.HV_NODEINFO_KEY_VERSION in dst_info)):
|
| 672 |
src_version = src_info[constants.HV_NODEINFO_KEY_VERSION] |
| 673 |
dst_version = dst_info[constants.HV_NODEINFO_KEY_VERSION] |
| 674 |
if src_version != dst_version:
|
| 675 |
self.feedback_fn("* warning: hypervisor version mismatch between" |
| 676 |
" source (%s) and target (%s) node" %
|
| 677 |
(src_version, dst_version)) |
| 678 |
|
| 679 |
self.feedback_fn("* checking disk consistency between source and target") |
| 680 |
for (idx, dev) in enumerate(self.instance.disks): |
| 681 |
if not CheckDiskConsistency(self.lu, self.instance, dev, |
| 682 |
self.target_node_uuid,
|
| 683 |
False):
|
| 684 |
raise errors.OpExecError("Disk %s is degraded or not fully" |
| 685 |
" synchronized on target node,"
|
| 686 |
" aborting migration" % idx)
|
| 687 |
|
| 688 |
if self.current_mem > self.tgt_free_mem: |
| 689 |
if not self.allow_runtime_changes: |
| 690 |
raise errors.OpExecError("Memory ballooning not allowed and not enough" |
| 691 |
" free memory to fit instance %s on target"
|
| 692 |
" node %s (have %dMB, need %dMB)" %
|
| 693 |
(self.instance.name,
|
| 694 |
self.cfg.GetNodeName(self.target_node_uuid), |
| 695 |
self.tgt_free_mem, self.current_mem)) |
| 696 |
self.feedback_fn("* setting instance memory to %s" % self.tgt_free_mem) |
| 697 |
rpcres = self.rpc.call_instance_balloon_memory(self.instance.primary_node, |
| 698 |
self.instance,
|
| 699 |
self.tgt_free_mem)
|
| 700 |
rpcres.Raise("Cannot modify instance runtime memory")
|
| 701 |
|
| 702 |
# First get the migration information from the remote node
|
| 703 |
result = self.rpc.call_migration_info(self.source_node_uuid, self.instance) |
| 704 |
msg = result.fail_msg |
| 705 |
if msg:
|
| 706 |
log_err = ("Failed fetching source migration information from %s: %s" %
|
| 707 |
(self.cfg.GetNodeName(self.source_node_uuid), msg)) |
| 708 |
logging.error(log_err) |
| 709 |
raise errors.OpExecError(log_err)
|
| 710 |
|
| 711 |
self.migration_info = migration_info = result.payload
|
| 712 |
|
| 713 |
if self.instance.disk_template not in constants.DTS_EXT_MIRROR: |
| 714 |
# Then switch the disks to master/master mode
|
| 715 |
self._EnsureSecondary(self.target_node_uuid) |
| 716 |
self._GoStandalone()
|
| 717 |
self._GoReconnect(True) |
| 718 |
self._WaitUntilSync()
|
| 719 |
|
| 720 |
self.feedback_fn("* preparing %s to accept the instance" % |
| 721 |
self.cfg.GetNodeName(self.target_node_uuid)) |
| 722 |
result = self.rpc.call_accept_instance(self.target_node_uuid, |
| 723 |
self.instance,
|
| 724 |
migration_info, |
| 725 |
self.nodes_ip[self.target_node_uuid]) |
| 726 |
|
| 727 |
msg = result.fail_msg |
| 728 |
if msg:
|
| 729 |
logging.error("Instance pre-migration failed, trying to revert"
|
| 730 |
" disk status: %s", msg)
|
| 731 |
self.feedback_fn("Pre-migration failed, aborting") |
| 732 |
self._AbortMigration()
|
| 733 |
self._RevertDiskStatus()
|
| 734 |
raise errors.OpExecError("Could not pre-migrate instance %s: %s" % |
| 735 |
(self.instance.name, msg))
|
| 736 |
|
| 737 |
self.feedback_fn("* migrating instance to %s" % |
| 738 |
self.cfg.GetNodeName(self.target_node_uuid)) |
| 739 |
cluster = self.cfg.GetClusterInfo()
|
| 740 |
result = self.rpc.call_instance_migrate(
|
| 741 |
self.source_node_uuid, cluster.cluster_name, self.instance, |
| 742 |
self.nodes_ip[self.target_node_uuid], self.live) |
| 743 |
msg = result.fail_msg |
| 744 |
if msg:
|
| 745 |
logging.error("Instance migration failed, trying to revert"
|
| 746 |
" disk status: %s", msg)
|
| 747 |
self.feedback_fn("Migration failed, aborting") |
| 748 |
self._AbortMigration()
|
| 749 |
self._RevertDiskStatus()
|
| 750 |
raise errors.OpExecError("Could not migrate instance %s: %s" % |
| 751 |
(self.instance.name, msg))
|
| 752 |
|
| 753 |
self.feedback_fn("* starting memory transfer") |
| 754 |
last_feedback = time.time() |
| 755 |
while True: |
| 756 |
result = self.rpc.call_instance_get_migration_status(
|
| 757 |
self.source_node_uuid, self.instance) |
| 758 |
msg = result.fail_msg |
| 759 |
ms = result.payload # MigrationStatus instance
|
| 760 |
if msg or (ms.status in constants.HV_MIGRATION_FAILED_STATUSES): |
| 761 |
logging.error("Instance migration failed, trying to revert"
|
| 762 |
" disk status: %s", msg)
|
| 763 |
self.feedback_fn("Migration failed, aborting") |
| 764 |
self._AbortMigration()
|
| 765 |
self._RevertDiskStatus()
|
| 766 |
if not msg: |
| 767 |
msg = "hypervisor returned failure"
|
| 768 |
raise errors.OpExecError("Could not migrate instance %s: %s" % |
| 769 |
(self.instance.name, msg))
|
| 770 |
|
| 771 |
if result.payload.status != constants.HV_MIGRATION_ACTIVE:
|
| 772 |
self.feedback_fn("* memory transfer complete") |
| 773 |
break
|
| 774 |
|
| 775 |
if (utils.TimeoutExpired(last_feedback,
|
| 776 |
self._MIGRATION_FEEDBACK_INTERVAL) and |
| 777 |
ms.transferred_ram is not None): |
| 778 |
mem_progress = 100 * float(ms.transferred_ram) / float(ms.total_ram) |
| 779 |
self.feedback_fn("* memory transfer progress: %.2f %%" % mem_progress) |
| 780 |
last_feedback = time.time() |
| 781 |
|
| 782 |
time.sleep(self._MIGRATION_POLL_INTERVAL)
|
| 783 |
|
| 784 |
result = self.rpc.call_instance_finalize_migration_src(
|
| 785 |
self.source_node_uuid, self.instance, True, self.live) |
| 786 |
msg = result.fail_msg |
| 787 |
if msg:
|
| 788 |
logging.error("Instance migration succeeded, but finalization failed"
|
| 789 |
" on the source node: %s", msg)
|
| 790 |
raise errors.OpExecError("Could not finalize instance migration: %s" % |
| 791 |
msg) |
| 792 |
|
| 793 |
self.instance.primary_node = self.target_node_uuid |
| 794 |
|
| 795 |
# distribute new instance config to the other nodes
|
| 796 |
self.cfg.Update(self.instance, self.feedback_fn) |
| 797 |
|
| 798 |
result = self.rpc.call_instance_finalize_migration_dst(
|
| 799 |
self.target_node_uuid, self.instance, migration_info, True) |
| 800 |
msg = result.fail_msg |
| 801 |
if msg:
|
| 802 |
logging.error("Instance migration succeeded, but finalization failed"
|
| 803 |
" on the target node: %s", msg)
|
| 804 |
raise errors.OpExecError("Could not finalize instance migration: %s" % |
| 805 |
msg) |
| 806 |
|
| 807 |
if self.instance.disk_template not in constants.DTS_EXT_MIRROR: |
| 808 |
self._EnsureSecondary(self.source_node_uuid) |
| 809 |
self._WaitUntilSync()
|
| 810 |
self._GoStandalone()
|
| 811 |
self._GoReconnect(False) |
| 812 |
self._WaitUntilSync()
|
| 813 |
|
| 814 |
# If the instance's disk template is `rbd' or `ext' and there was a
|
| 815 |
# successful migration, unmap the device from the source node.
|
| 816 |
if self.instance.disk_template in (constants.DT_RBD, constants.DT_EXT): |
| 817 |
disks = ExpandCheckDisks(self.instance, self.instance.disks) |
| 818 |
self.feedback_fn("* unmapping instance's disks from %s" % |
| 819 |
self.cfg.GetNodeName(self.source_node_uuid)) |
| 820 |
for disk in disks: |
| 821 |
result = self.rpc.call_blockdev_shutdown(self.source_node_uuid, |
| 822 |
(disk, self.instance))
|
| 823 |
msg = result.fail_msg |
| 824 |
if msg:
|
| 825 |
logging.error("Migration was successful, but couldn't unmap the"
|
| 826 |
" block device %s on source node %s: %s",
|
| 827 |
disk.iv_name, |
| 828 |
self.cfg.GetNodeName(self.source_node_uuid), msg) |
| 829 |
logging.error("You need to unmap the device %s manually on %s",
|
| 830 |
disk.iv_name, |
| 831 |
self.cfg.GetNodeName(self.source_node_uuid)) |
| 832 |
|
| 833 |
self.feedback_fn("* done") |
| 834 |
|
| 835 |
def _ExecFailover(self): |
| 836 |
"""Failover an instance.
|
| 837 |
|
| 838 |
The failover is done by shutting it down on its present node and
|
| 839 |
starting it on the secondary.
|
| 840 |
|
| 841 |
"""
|
| 842 |
primary_node = self.cfg.GetNodeInfo(self.instance.primary_node) |
| 843 |
|
| 844 |
source_node_uuid = self.instance.primary_node
|
| 845 |
|
| 846 |
if self.instance.disks_active: |
| 847 |
self.feedback_fn("* checking disk consistency between source and target") |
| 848 |
for (idx, dev) in enumerate(self.instance.disks): |
| 849 |
# for drbd, these are drbd over lvm
|
| 850 |
if not CheckDiskConsistency(self.lu, self.instance, dev, |
| 851 |
self.target_node_uuid, False): |
| 852 |
if primary_node.offline:
|
| 853 |
self.feedback_fn("Node %s is offline, ignoring degraded disk %s on" |
| 854 |
" target node %s" %
|
| 855 |
(primary_node.name, idx, |
| 856 |
self.cfg.GetNodeName(self.target_node_uuid))) |
| 857 |
elif not self.ignore_consistency: |
| 858 |
raise errors.OpExecError("Disk %s is degraded on target node," |
| 859 |
" aborting failover" % idx)
|
| 860 |
else:
|
| 861 |
self.feedback_fn("* not checking disk consistency as instance is not" |
| 862 |
" running")
|
| 863 |
|
| 864 |
self.feedback_fn("* shutting down instance on source node") |
| 865 |
logging.info("Shutting down instance %s on node %s",
|
| 866 |
self.instance.name, self.cfg.GetNodeName(source_node_uuid)) |
| 867 |
|
| 868 |
result = self.rpc.call_instance_shutdown(source_node_uuid, self.instance, |
| 869 |
self.shutdown_timeout,
|
| 870 |
self.lu.op.reason)
|
| 871 |
msg = result.fail_msg |
| 872 |
if msg:
|
| 873 |
if self.ignore_consistency or primary_node.offline: |
| 874 |
self.lu.LogWarning("Could not shutdown instance %s on node %s," |
| 875 |
" proceeding anyway; please make sure node"
|
| 876 |
" %s is down; error details: %s",
|
| 877 |
self.instance.name,
|
| 878 |
self.cfg.GetNodeName(source_node_uuid),
|
| 879 |
self.cfg.GetNodeName(source_node_uuid), msg)
|
| 880 |
else:
|
| 881 |
raise errors.OpExecError("Could not shutdown instance %s on" |
| 882 |
" node %s: %s" %
|
| 883 |
(self.instance.name,
|
| 884 |
self.cfg.GetNodeName(source_node_uuid), msg))
|
| 885 |
|
| 886 |
self.feedback_fn("* deactivating the instance's disks on source node") |
| 887 |
if not ShutdownInstanceDisks(self.lu, self.instance, ignore_primary=True): |
| 888 |
raise errors.OpExecError("Can't shut down the instance's disks") |
| 889 |
|
| 890 |
self.instance.primary_node = self.target_node_uuid |
| 891 |
# distribute new instance config to the other nodes
|
| 892 |
self.cfg.Update(self.instance, self.feedback_fn) |
| 893 |
|
| 894 |
# Only start the instance if it's marked as up
|
| 895 |
if self.instance.admin_state == constants.ADMINST_UP: |
| 896 |
self.feedback_fn("* activating the instance's disks on target node %s" % |
| 897 |
self.cfg.GetNodeName(self.target_node_uuid)) |
| 898 |
logging.info("Starting instance %s on node %s", self.instance.name, |
| 899 |
self.cfg.GetNodeName(self.target_node_uuid)) |
| 900 |
|
| 901 |
disks_ok, _ = AssembleInstanceDisks(self.lu, self.instance, |
| 902 |
ignore_secondaries=True)
|
| 903 |
if not disks_ok: |
| 904 |
ShutdownInstanceDisks(self.lu, self.instance) |
| 905 |
raise errors.OpExecError("Can't activate the instance's disks") |
| 906 |
|
| 907 |
self.feedback_fn("* starting the instance on the target node %s" % |
| 908 |
self.cfg.GetNodeName(self.target_node_uuid)) |
| 909 |
result = self.rpc.call_instance_start(self.target_node_uuid, |
| 910 |
(self.instance, None, None), False, |
| 911 |
self.lu.op.reason)
|
| 912 |
msg = result.fail_msg |
| 913 |
if msg:
|
| 914 |
ShutdownInstanceDisks(self.lu, self.instance) |
| 915 |
raise errors.OpExecError("Could not start instance %s on node %s: %s" % |
| 916 |
(self.instance.name,
|
| 917 |
self.cfg.GetNodeName(self.target_node_uuid), |
| 918 |
msg)) |
| 919 |
|
| 920 |
def Exec(self, feedback_fn): |
| 921 |
"""Perform the migration.
|
| 922 |
|
| 923 |
"""
|
| 924 |
self.feedback_fn = feedback_fn
|
| 925 |
self.source_node_uuid = self.instance.primary_node |
| 926 |
|
| 927 |
# FIXME: if we implement migrate-to-any in DRBD, this needs fixing
|
| 928 |
if self.instance.disk_template in constants.DTS_INT_MIRROR: |
| 929 |
self.target_node_uuid = self.instance.secondary_nodes[0] |
| 930 |
# Otherwise self.target_node has been populated either
|
| 931 |
# directly, or through an iallocator.
|
| 932 |
|
| 933 |
self.all_node_uuids = [self.source_node_uuid, self.target_node_uuid] |
| 934 |
self.nodes_ip = dict((uuid, node.secondary_ip) for (uuid, node) |
| 935 |
in self.cfg.GetMultiNodeInfo(self.all_node_uuids)) |
| 936 |
|
| 937 |
if self.failover: |
| 938 |
feedback_fn("Failover instance %s" % self.instance.name) |
| 939 |
self._ExecFailover()
|
| 940 |
else:
|
| 941 |
feedback_fn("Migrating instance %s" % self.instance.name) |
| 942 |
|
| 943 |
if self.cleanup: |
| 944 |
return self._ExecCleanup() |
| 945 |
else:
|
| 946 |
return self._ExecMigration() |