def GetUid(user, _getpwnam):
"""Retrieve the uid from the database.
@type user: string
@param user: The username to retrieve
@return: The resolved uid
"""
try:
return _getpwnam(user).pw_uid
except KeyError, err:
raise errors.ConfigurationError("User '%s' not found (%s)" %
(user, err))
def GetGid(group, _getgrnam):
"""Retrieve the gid from the database.
@type group: string
@param group: The group name to retrieve
@return: The resolved gid
"""
try:
return _getgrnam(group).gr_gid
except KeyError as err:
raise errors.ConfigurationError("Group '%s' not found (%s)" %
(group, err))
def _ReadFile(self, key, default=None):
"""Generic routine to read keys.
This will read the file which holds the value requested. Errors
will be changed into ConfigurationErrors.
"""
filename = self.KeyToFilename(key)
try:
return ReadSsconfFile(filename)
except EnvironmentError as err:
if err.errno == errno.ENOENT and default is not None:
return default
raise errors.ConfigurationError("Can't read ssconf file %s: %s" %
(filename, str(err)))
def Generate(self, existing, generate_one_fn, ec_id):
"""Generate a new resource of this type
"""
assert callable(generate_one_fn)
all_elems = self.GetReserved()
all_elems.update(existing)
retries = 64
while retries > 0:
new_resource = generate_one_fn()
if new_resource is not None and new_resource not in all_elems:
break
else:
raise errors.ConfigurationError("Not able generate new resource"
" (last tried: %s)" % new_resource)
self.Reserve(ec_id, new_resource)
return new_resource
def __init__(self):
raise errors.ConfigurationError("No entries")
def CheckPrereq(self):
"""Check prerequisites.
This checks that the instance is in the cluster.
"""
(self.instance_uuid, self.instance_name) = \
ExpandInstanceUuidAndName(self.lu.cfg, self.instance_uuid,
self.instance_name)
self.instance = self.cfg.GetInstanceInfo(self.instance_uuid)
assert self.instance is not None
cluster = self.cfg.GetClusterInfo()
if (not self.cleanup and
not self.instance.admin_state == constants.ADMINST_UP and
not self.failover and self.fallback):
self.lu.LogInfo("Instance is marked down or offline, fallback allowed,"
" switching to failover")
self.failover = True
disks = self.cfg.GetInstanceDisks(self.instance.uuid)
if not utils.AllDiskOfType(disks, constants.DTS_MIRRORED):
if self.failover:
text = "failovers"
else:
text = "migrations"
invalid_disks = set(d.dev_type for d in disks
if d.dev_type not in constants.DTS_MIRRORED)
raise errors.OpPrereqError("Instance's disk layout '%s' does not allow"
" %s" % (utils.CommaJoin(invalid_disks), text),
errors.ECODE_STATE)
# TODO allow heterogeneous disk types if all are mirrored in some way.
if utils.AllDiskOfType(disks, constants.DTS_EXT_MIRROR):
CheckIAllocatorOrNode(self.lu, "iallocator", "target_node")
if self.lu.op.iallocator:
self._RunAllocator()
else:
# We set set self.target_node_uuid as it is required by
# BuildHooksEnv
self.target_node_uuid = self.lu.op.target_node_uuid
# Check that the target node is correct in terms of instance policy
nodeinfo = self.cfg.GetNodeInfo(self.target_node_uuid)
group_info = self.cfg.GetNodeGroup(nodeinfo.group)
ipolicy = ganeti.masterd.instance.CalculateGroupIPolicy(cluster,
group_info)
CheckTargetNodeIPolicy(self.lu, ipolicy, self.instance, nodeinfo,
self.cfg, ignore=self.ignore_ipolicy)
# self.target_node is already populated, either directly or by the
# iallocator run
target_node_uuid = self.target_node_uuid
if self.target_node_uuid == self.instance.primary_node:
raise errors.OpPrereqError(
"Cannot migrate instance %s to its primary (%s)" %
(self.instance.name,
self.cfg.GetNodeName(self.instance.primary_node)),
errors.ECODE_STATE)
if len(self.lu.tasklets) == 1:
# It is safe to release locks only when we're the only tasklet
# in the LU
ReleaseLocks(self.lu, locking.LEVEL_NODE,
keep=[self.instance.primary_node, self.target_node_uuid])
elif utils.AllDiskOfType(disks, constants.DTS_INT_MIRROR):
templates = [d.dev_type for d in disks]
secondary_node_uuids = \
self.cfg.GetInstanceSecondaryNodes(self.instance.uuid)
if not secondary_node_uuids:
raise errors.ConfigurationError("No secondary node but using"
" %s disk types" %
utils.CommaJoin(set(templates)))
self.target_node_uuid = target_node_uuid = secondary_node_uuids[0]
if self.lu.op.iallocator or \
(self.lu.op.target_node_uuid and
self.lu.op.target_node_uuid != target_node_uuid):
if self.failover:
text = "failed over"
else:
text = "migrated"
raise errors.OpPrereqError("Instances with disk types %s cannot"
" be %s to arbitrary nodes"
" (neither an iallocator nor a target"
" node can be passed)" %
(utils.CommaJoin(set(templates)), text),
errors.ECODE_INVAL)
nodeinfo = self.cfg.GetNodeInfo(target_node_uuid)
group_info = self.cfg.GetNodeGroup(nodeinfo.group)
ipolicy = ganeti.masterd.instance.CalculateGroupIPolicy(cluster,
group_info)
CheckTargetNodeIPolicy(self.lu, ipolicy, self.instance, nodeinfo,
self.cfg, ignore=self.ignore_ipolicy)
else:
raise errors.OpPrereqError("Instance mixes internal and external "
"mirroring. This is not currently supported.")
i_be = cluster.FillBE(self.instance)
# check memory requirements on the secondary node
if (not self.cleanup and
(not self.failover or
self.instance.admin_state == constants.ADMINST_UP)):
self.tgt_free_mem = CheckNodeFreeMemory(
self.lu, target_node_uuid,
"migrating instance %s" % self.instance.name,
i_be[constants.BE_MINMEM], self.instance.hypervisor,
self.cfg.GetClusterInfo().hvparams[self.instance.hypervisor])
else:
self.lu.LogInfo("Not checking memory on the secondary node as"
" instance will not be started")
# check if failover must be forced instead of migration
if (not self.cleanup and not self.failover and
i_be[constants.BE_ALWAYS_FAILOVER]):
self.lu.LogInfo("Instance configured to always failover; fallback"
" to failover")
self.failover = True
# check bridge existance
CheckInstanceBridgesExist(self.lu, self.instance,
node_uuid=target_node_uuid)
if not self.cleanup:
CheckNodeNotDrained(self.lu, target_node_uuid)
if not self.failover:
result = self.rpc.call_instance_migratable(self.instance.primary_node,
self.instance)
if result.fail_msg and self.fallback:
self.lu.LogInfo("Can't migrate, instance offline, fallback to"
" failover")
self.failover = True
else:
result.Raise("Can't migrate, please use failover",
prereq=True, ecode=errors.ECODE_STATE)
assert not (self.failover and self.cleanup)
if not self.failover:
if self.lu.op.live is not None and self.lu.op.mode is not None:
raise errors.OpPrereqError("Only one of the 'live' and 'mode'"
" parameters are accepted",
errors.ECODE_INVAL)
if self.lu.op.live is not None:
if self.lu.op.live:
self.lu.op.mode = constants.HT_MIGRATION_LIVE
else:
self.lu.op.mode = constants.HT_MIGRATION_NONLIVE
# reset the 'live' parameter to None so that repeated
# invocations of CheckPrereq do not raise an exception
self.lu.op.live = None
elif self.lu.op.mode is None:
# read the default value from the hypervisor
i_hv = cluster.FillHV(self.instance, skip_globals=False)
self.lu.op.mode = i_hv[constants.HV_MIGRATION_MODE]
self.live = self.lu.op.mode == constants.HT_MIGRATION_LIVE
else:
# Failover is never live
self.live = False
if not (self.failover or self.cleanup):
remote_info = self.rpc.call_instance_info(
self.instance.primary_node, self.instance.name,
self.instance.hypervisor, cluster.hvparams[self.instance.hypervisor])
remote_info.Raise("Error checking instance on node %s" %
self.cfg.GetNodeName(self.instance.primary_node),
prereq=True)
instance_running = bool(remote_info.payload)
if instance_running:
self.current_mem = int(remote_info.payload["memory"])
