Commit db366d9a authored by Apollon Oikonomopoulos's avatar Apollon Oikonomopoulos Committed by Iustin Pop

Shared storage instance failover

Modify LUFailoverInstance to enable shared storage instances to failover.
Shared storage instance failover requires either a target node or an
iallocator to determine the target node. If none is given, the cluster default
iallocator is used.

The hook environment variables {OLD,NEW}_SECONDARY will be blank for shared
storage instances.

Locking behaviour is the same as for instance migration.
Signed-off-by: default avatarApollon Oikonomopoulos <>
[ revert the DTS_NET_MIRROR specific changes]
Signed-off-by: default avatarIustin Pop <>
Reviewed-by: default avatarIustin Pop <>
parent aac4511a
......@@ -5704,14 +5704,35 @@ class LUInstanceFailover(LogicalUnit):
REQ_BGL = False
def CheckArguments(self):
"""Check the arguments.
self.iallocator = getattr(self.op, "iallocator", None)
self.target_node = getattr(self.op, "target_node", None)
_CheckIAllocatorOrNode(self, "iallocator", "target_node")
def ExpandNames(self):
if self.op.target_node is not None:
self.op.target_node = _ExpandNodeName(self.cfg, self.op.target_node)
self.needed_locks[locking.LEVEL_NODE] = []
self.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_REPLACE
def DeclareLocks(self, level):
if level == locking.LEVEL_NODE:
instance = self.context.cfg.GetInstanceInfo(self.op.instance_name)
if instance.disk_template in constants.DTS_EXT_MIRROR:
if self.op.target_node is None:
self.needed_locks[locking.LEVEL_NODE] = locking.ALL_SET
self.needed_locks[locking.LEVEL_NODE] = [instance.primary_node,
del self.recalculate_locks[locking.LEVEL_NODE]
def BuildHooksEnv(self):
"""Build hooks env.
......@@ -5721,15 +5742,19 @@ class LUInstanceFailover(LogicalUnit):
instance = self.instance
source_node = instance.primary_node
target_node = instance.secondary_nodes[0]
env = {
"IGNORE_CONSISTENCY": self.op.ignore_consistency,
"SHUTDOWN_TIMEOUT": self.op.shutdown_timeout,
"OLD_PRIMARY": source_node,
"OLD_SECONDARY": target_node,
"NEW_PRIMARY": target_node,
"NEW_SECONDARY": source_node,
"NEW_PRIMARY": self.op.target_node,
if instance.disk_template in constants.DTS_NET_MIRROR:
env["OLD_SECONDARY"] = instance.secondary_nodes[0]
env["NEW_SECONDARY"] = source_node
env["OLD_SECONDARY"] = env["NEW_SECONDARY"] = ""
env.update(_BuildInstanceHookEnvByObject(self, instance))
nl = [self.cfg.GetMasterNode()] + list(instance.secondary_nodes)
nl_post = list(nl)
......@@ -5747,19 +5772,39 @@ class LUInstanceFailover(LogicalUnit):
"Cannot retrieve locked instance %s" % self.op.instance_name
bep = self.cfg.GetClusterInfo().FillBE(instance)
if instance.disk_template not in constants.DTS_NET_MIRROR:
if instance.disk_template not in constants.DTS_MIRRORED:
raise errors.OpPrereqError("Instance's disk layout is not"
" network mirrored, cannot failover.",
" mirrored, cannot failover.",
secondary_nodes = instance.secondary_nodes
if not secondary_nodes:
raise errors.ProgrammerError("no secondary node but using "
"a mirrored disk template")
if instance.disk_template in constants.DTS_EXT_MIRROR:
if self.op.iallocator:
# Release all unnecessary node locks
nodes_keep = [instance.primary_node, self.op.target_node]
nodes_rel = [node for node in self.acquired_locks[locking.LEVEL_NODE]
if node not in nodes_keep]
self.context.glm.release(locking.LEVEL_NODE, nodes_rel)
self.acquired_locks[locking.LEVEL_NODE] = nodes_keep
# self.op.target_node is already populated, either directly or by the
# iallocator run
target_node = self.op.target_node
secondary_nodes = instance.secondary_nodes
if not secondary_nodes:
raise errors.ConfigurationError("No secondary node but using"
" %s disk template" %
target_node = secondary_nodes[0]
target_node = secondary_nodes[0]
_CheckNodeOnline(self, target_node)
_CheckNodeNotDrained(self, target_node)
# Save target_node so that we can use it in BuildHooksEnv
self.op.target_node = target_node
if instance.admin_up:
# check memory requirements on the secondary node
_CheckNodeFreeMemory(self, target_node, "failing over instance %s" %
......@@ -5783,7 +5828,7 @@ class LUInstanceFailover(LogicalUnit):
primary_node = self.cfg.GetNodeInfo(instance.primary_node)
source_node = instance.primary_node
target_node = instance.secondary_nodes[0]
target_node = self.op.target_node
if instance.admin_up:
feedback_fn("* checking disk consistency between source and target")
......@@ -5842,6 +5887,35 @@ class LUInstanceFailover(LogicalUnit):
raise errors.OpExecError("Could not start instance %s on node %s: %s" %
(, target_node, msg))
def _RunAllocator(self):
"""Run the allocator based on input opcode.
ial = IAllocator(self.cfg, self.rpc,
# TODO See why hail breaks with a single node below
if not ial.success:
raise errors.OpPrereqError("Can't compute nodes using"
" iallocator '%s': %s" %
if len(ial.result) != ial.required_nodes:
raise errors.OpPrereqError("iallocator '%s' returned invalid number"
" of nodes (%s), required %s" %
(self.op.iallocator, len(ial.result),
ial.required_nodes), errors.ECODE_FAULT)
self.op.target_node = ial.result[0]
self.LogInfo("Selected nodes for instance %s via iallocator %s: %s",, self.op.iallocator,
class LUInstanceMigrate(LogicalUnit):
"""Migrate an instance.
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