def FinalizeClusterDestroy(master_uuid):
"""Execute the last steps of cluster destroy
This function shuts down all the daemons, completing the destroy
begun in cmdlib.LUDestroyOpcode.
"""
livelock = utils.livelock.LiveLock("bootstrap_destroy")
cfg = config.GetConfig(None, livelock)
modify_ssh_setup = cfg.GetClusterInfo().modify_ssh_setup
runner = rpc.BootstrapRunner()
master_name = cfg.GetNodeName(master_uuid)
master_params = cfg.GetMasterNetworkParameters()
master_params.uuid = master_uuid
ems = cfg.GetUseExternalMipScript()
result = runner.call_node_deactivate_master_ip(master_name, master_params,
ems)
msg = result.fail_msg
if msg:
logging.warning("Could not disable the master IP: %s", msg)
result = runner.call_node_stop_master(master_name)
msg = result.fail_msg
if msg:
logging.warning("Could not disable the master role: %s", msg)
result = runner.call_node_leave_cluster(master_name, modify_ssh_setup)
msg = result.fail_msg
if msg:
logging.warning(
"Could not shutdown the node daemon and cleanup"
" the node: %s", msg)
def GatherMasterVotes(node_names):
"""Check the agreement on who is the master.
This function will return a list of (node, number of votes), ordered
by the number of votes. Errors will be denoted by the key 'None'.
Note that the sum of votes is the number of nodes this machine
knows, whereas the number of entries in the list could be different
(if some nodes vote for another master).
We remove ourselves from the list since we know that (bugs aside)
since we use the same source for configuration information for both
backend and boostrap, we'll always vote for ourselves.
@type node_names: list
@param node_names: the list of nodes to query for master info; the current
node will be removed if it is in the list
@rtype: list
@return: list of (node, votes)
"""
myself = netutils.Hostname.GetSysName()
try:
node_names.remove(myself)
except ValueError:
pass
if not node_names:
# no nodes left (eventually after removing myself)
return []
results = rpc.BootstrapRunner().call_master_node_name(node_names)
if not isinstance(results, dict):
# this should not happen (unless internal error in rpc)
logging.critical("Can't complete rpc call, aborting master startup")
return [(None, len(node_names))]
votes = {}
for node_name in results:
nres = results[node_name]
msg = nres.fail_msg
if msg:
logging.warning("Error contacting node %s: %s", node_name, msg)
node = None
else:
node = nres.payload
if node not in votes:
votes[node] = 1
else:
votes[node] += 1
vote_list = [v for v in votes.items()]
# sort first on number of votes then on name, since we want None
# sorted later if we have the half of the nodes not responding, and
# half voting all for the same master
vote_list.sort(key=lambda x: (x[1], x[0]), reverse=True)
return vote_list
def ActivateMasterIP():
# activate ip
cfg = config.ConfigWriter()
master_params = cfg.GetMasterNetworkParameters()
ems = cfg.GetUseExternalMipScript()
runner = rpc.BootstrapRunner()
# we use the node name, as the configuration is only available here yet
result = runner.call_node_activate_master_ip(
cfg.GetNodeName(master_params.uuid), master_params, ems)
msg = result.fail_msg
if msg:
logging.error("Can't activate master IP address: %s", msg)
def ActivateMasterIP():
# activate ip
# Create a livelock file
livelock = utils.livelock.LiveLock("masterd_activate_ip")
cfg = config.GetConfig(None, livelock)
master_params = cfg.GetMasterNetworkParameters()
ems = cfg.GetUseExternalMipScript()
runner = rpc.BootstrapRunner()
# we use the node name, as the configuration is only available here yet
result = runner.call_node_activate_master_ip(
cfg.GetNodeName(master_params.uuid), master_params, ems)
msg = result.fail_msg
if msg:
logging.error("Can't activate master IP address: %s", msg)
def GatherMasterVotes(node_names):
"""Check the agreement on who is the master.
This function will return a list of (node, number of votes), ordered
by the number of votes. Errors will be denoted by the key 'None'.
Note that the sum of votes is the number of nodes this machine
knows, whereas the number of entries in the list could be different
(if some nodes vote for another master).
@type node_names: list
@param node_names: the list of nodes to query for master info
@rtype: list
@return: list of (node, votes)
"""
if not node_names:
# no nodes
return []
results = rpc.BootstrapRunner().call_master_node_name(node_names)
if not isinstance(results, dict):
# this should not happen (unless internal error in rpc)
logging.critical("Can't complete rpc call, aborting master startup")
return [(None, len(node_names))]
votes = {}
for node_name in results:
nres = results[node_name]
msg = nres.fail_msg
if msg:
logging.warning("Error contacting node %s: %s", node_name, msg)
node = None
else:
node = nres.payload
if node not in votes:
votes[node] = 1
else:
votes[node] += 1
vote_list = [v for v in votes.items()]
# sort first on number of votes then on name, since we want None
# sorted later if we have the half of the nodes not responding, and
# half voting all for the same master
vote_list.sort(key=lambda x: (x[1], x[0]), reverse=True)
return vote_list
def _GatherMasterVotes(node_names):
"""Check the agreement on who is the master.
This function will return a list of (node, number of votes), ordered
by the number of votes.
Note that the sum of votes is the number of nodes this machine
knows, whereas the number of entries in the list could be different
(if some nodes vote for another master).
@type node_names: list
@param node_names: the list of nodes to query for master info
@rtype: list
@return: list of (node, votes)
"""
if not node_names:
# no nodes
return []
results = rpc.BootstrapRunner().call_master_node_name(node_names)
if not isinstance(results, dict):
# this should not happen (unless internal error in rpc)
logging.critical("Can't complete rpc call, aborting master startup")
return [(None, len(node_names))]
votes = {}
for (node_name, nres) in results.iteritems():
msg = nres.fail_msg
if msg:
logging.warning("Error contacting node %s: %s", node_name, msg)
continue
node = nres.payload
if not node:
logging.warning(
('Expected a Node, encountered a None. Skipping this'
' voting result.'))
if node not in votes:
votes[node] = 1
else:
votes[node] += 1
vote_list = votes.items()
vote_list.sort(key=lambda x: x[1], reverse=True)
return vote_list
def _CheckNodeDaemon():
# Pylint bug <http://www.logilab.org/ticket/35642>
# pylint: disable=E1101
result = rpc.BootstrapRunner().call_version([node_name])[node_name]
if result.fail_msg:
raise utils.RetryAgain()
def MasterFailover(no_voting=False):
"""Failover the master node.
This checks that we are not already the master, and will cause the
current master to cease being master, and the non-master to become
new master.
@type no_voting: boolean
@param no_voting: force the operation without remote nodes agreement
(dangerous)
@returns: the pair of an exit code and warnings to display
"""
sstore = ssconf.SimpleStore()
old_master, new_master = ssconf.GetMasterAndMyself(sstore)
node_names = sstore.GetNodeList()
mc_list = sstore.GetMasterCandidates()
if old_master == new_master:
raise errors.OpPrereqError(
"This commands must be run on the node"
" where you want the new master to be."
" %s is already the master" % old_master, errors.ECODE_INVAL)
if new_master not in mc_list:
mc_no_master = [name for name in mc_list if name != old_master]
raise errors.OpPrereqError(
"This node is not among the nodes marked"
" as master candidates. Only these nodes"
" can become masters. Current list of"
" master candidates is:\n"
"%s" % ("\n".join(mc_no_master)), errors.ECODE_STATE)
if not no_voting:
vote_list = GatherMasterVotes(node_names)
if vote_list:
voted_master = vote_list[0][0]
if voted_master is None:
raise errors.OpPrereqError(
"Cluster is inconsistent, most nodes did"
" not respond.", errors.ECODE_ENVIRON)
elif voted_master != old_master:
raise errors.OpPrereqError(
"I have a wrong configuration, I believe"
" the master is %s but the other nodes"
" voted %s. Please resync the configuration"
" of this node." % (old_master, voted_master),
errors.ECODE_STATE)
# end checks
rcode = 0
warnings = []
logging.info("Setting master to %s, old master: %s", new_master,
old_master)
try:
# Forcefully start WConfd so that we can access the configuration
result = utils.RunCmd([
pathutils.DAEMON_UTIL, "start", constants.WCONFD, "--force-node",
"--no-voting", "--yes-do-it"
])
if result.failed:
raise errors.OpPrereqError(
"Could not start the configuration daemon,"
" command %s had exitcode %s and error %s" %
(result.cmd, result.exit_code, result.output),
errors.ECODE_NOENT)
# instantiate a real config writer, as we now know we have the
# configuration data
livelock = utils.livelock.LiveLock("bootstrap_failover")
cfg = config.GetConfig(None, livelock, accept_foreign=True)
old_master_node = cfg.GetNodeInfoByName(old_master)
if old_master_node is None:
raise errors.OpPrereqError(
"Could not find old master node '%s' in"
" cluster configuration." % old_master, errors.ECODE_NOENT)
cluster_info = cfg.GetClusterInfo()
new_master_node = cfg.GetNodeInfoByName(new_master)
if new_master_node is None:
raise errors.OpPrereqError(
"Could not find new master node '%s' in"
" cluster configuration." % new_master, errors.ECODE_NOENT)
cluster_info.master_node = new_master_node.uuid
# this will also regenerate the ssconf files, since we updated the
# cluster info
cfg.Update(cluster_info, logging.error)
# if cfg.Update worked, then it means the old master daemon won't be
# able now to write its own config file (we rely on locking in both
# backend.UploadFile() and ConfigWriter._Write(); hence the next
# step is to kill the old master
logging.info("Stopping the master daemon on node %s", old_master)
runner = rpc.BootstrapRunner()
master_params = cfg.GetMasterNetworkParameters()
master_params.uuid = old_master_node.uuid
ems = cfg.GetUseExternalMipScript()
result = runner.call_node_deactivate_master_ip(old_master,
master_params, ems)
msg = result.fail_msg
if msg:
warning = "Could not disable the master IP: %s" % (msg, )
logging.warning("%s", warning)
warnings.append(warning)
result = runner.call_node_stop_master(old_master)
msg = result.fail_msg
if msg:
warning = ("Could not disable the master role on the old master"
" %s, please disable manually: %s" % (old_master, msg))
logging.error("%s", warning)
warnings.append(warning)
except errors.ConfigurationError, err:
logging.error("Error while trying to set the new master: %s", str(err))
return 1, warnings
utils.Retry(_check_ip, (1, 1.5, 5), total_timeout, args=[False])
except utils.RetryTimeout:
warning = ("The master IP is still reachable after %s seconds,"
" continuing but activating the master IP on the current"
" node will probably fail" % total_timeout)
logging.warning("%s", warning)
warnings.append(warning)
rcode = 1
if jstore.CheckDrainFlag():
logging.info("Undraining job queue")
jstore.SetDrainFlag(False)
logging.info("Starting the master daemons on the new master")
result = rpc.BootstrapRunner().call_node_start_master_daemons(
new_master, no_voting)
msg = result.fail_msg
if msg:
logging.error(
"Could not start the master role on the new master"
" %s, please check: %s", new_master, msg)
rcode = 1
# Finally verify that the new master managed to set up the master IP
# and warn if it didn't.
try:
utils.Retry(_check_ip, (1, 1.5, 5), total_timeout, args=[True])
except utils.RetryTimeout:
warning = ("The master IP did not come up within %s seconds; the"
" cluster should still be working and reachable via %s,"
" but not via the master IP address" %
def MasterFailover(no_voting=False):
"""Failover the master node.
This checks that we are not already the master, and will cause the
current master to cease being master, and the non-master to become
new master.
Note: The call to MasterFailover from lib/client/gnt_cluster.py checks that
a majority of nodes are healthy and responding before calling this. If this
function is called from somewhere else, the caller should also verify that a
majority of nodes are healthy.
@type no_voting: boolean
@param no_voting: force the operation without remote nodes agreement
(dangerous)
@returns: the pair of an exit code and warnings to display
"""
sstore = ssconf.SimpleStore()
old_master, new_master = ssconf.GetMasterAndMyself(sstore)
node_names = sstore.GetNodeList()
mc_list = sstore.GetMasterCandidates()
if old_master == new_master:
raise errors.OpPrereqError(
"This commands must be run on the node"
" where you want the new master to be."
" %s is already the master" % old_master, errors.ECODE_INVAL)
if new_master not in mc_list:
mc_no_master = [name for name in mc_list if name != old_master]
raise errors.OpPrereqError(
"This node is not among the nodes marked"
" as master candidates. Only these nodes"
" can become masters. Current list of"
" master candidates is:\n"
"%s" % ("\n".join(mc_no_master)), errors.ECODE_STATE)
if not no_voting:
vote_list = _GatherMasterVotes(node_names)
if vote_list:
voted_master = vote_list[0][0]
if voted_master != old_master:
raise errors.OpPrereqError(
"I have a wrong configuration, I believe"
" the master is %s but the other nodes"
" voted %s. Please resync the configuration"
" of this node." % (old_master, voted_master),
errors.ECODE_STATE)
# end checks
rcode = 0
warnings = []
logging.info("Setting master to %s, old master: %s", new_master,
old_master)
try:
# Forcefully start WConfd so that we can access the configuration
result = utils.RunCmd([
pathutils.DAEMON_UTIL, "start", constants.WCONFD, "--force-node",
"--no-voting", "--yes-do-it"
])
if result.failed:
raise errors.OpPrereqError(
"Could not start the configuration daemon,"
" command %s had exitcode %s and error %s" %
(result.cmd, result.exit_code, result.output),
errors.ECODE_NOENT)
# instantiate a real config writer, as we now know we have the
# configuration data
livelock = utils.livelock.LiveLock("bootstrap_failover")
cfg = config.GetConfig(None, livelock, accept_foreign=True)
old_master_node = cfg.GetNodeInfoByName(old_master)
if old_master_node is None:
raise errors.OpPrereqError(
"Could not find old master node '%s' in"
" cluster configuration." % old_master, errors.ECODE_NOENT)
cluster_info = cfg.GetClusterInfo()
new_master_node = cfg.GetNodeInfoByName(new_master)
if new_master_node is None:
raise errors.OpPrereqError(
"Could not find new master node '%s' in"
" cluster configuration." % new_master, errors.ECODE_NOENT)
cluster_info.master_node = new_master_node.uuid
# this will also regenerate the ssconf files, since we updated the
# cluster info
cfg.Update(cluster_info, logging.error)
# if cfg.Update worked, then it means the old master daemon won't be
# able now to write its own config file (we rely on locking in both
# backend.UploadFile() and ConfigWriter._Write(); hence the next
# step is to kill the old master
logging.info("Stopping the master daemon on node %s", old_master)
runner = rpc.BootstrapRunner()
master_params = cfg.GetMasterNetworkParameters()
master_params.uuid = old_master_node.uuid
ems = cfg.GetUseExternalMipScript()
result = runner.call_node_deactivate_master_ip(old_master,
master_params, ems)
msg = result.fail_msg
if msg:
warning = "Could not disable the master IP: %s" % (msg, )
logging.warning("%s", warning)
warnings.append(warning)
result = runner.call_node_stop_master(old_master)
msg = result.fail_msg
if msg:
warning = ("Could not disable the master role on the old master"
" %s, please disable manually: %s" % (old_master, msg))
logging.error("%s", warning)
warnings.append(warning)
except errors.ConfigurationError as err:
logging.error("Error while trying to set the new master: %s", str(err))
return 1, warnings
finally:
# stop WConfd again:
result = utils.RunCmd(
[pathutils.DAEMON_UTIL, "stop", constants.WCONFD])
if result.failed:
warning = ("Could not stop the configuration daemon,"
" command %s had exitcode %s and error %s" %
(result.cmd, result.exit_code, result.output))
logging.error("%s", warning)
rcode = 1
logging.info("Checking master IP non-reachability...")
master_ip = sstore.GetMasterIP()
total_timeout = 30
# Here we have a phase where no master should be running
def _check_ip(expected):
if netutils.TcpPing(master_ip,
constants.DEFAULT_NODED_PORT) != expected:
raise utils.RetryAgain()
try:
utils.Retry(_check_ip, (1, 1.5, 5), total_timeout, args=[False])
except utils.RetryTimeout:
warning = ("The master IP is still reachable after %s seconds,"
" continuing but activating the master IP on the current"
" node will probably fail" % total_timeout)
logging.warning("%s", warning)
warnings.append(warning)
rcode = 1
if jstore.CheckDrainFlag():
logging.info("Undraining job queue")
jstore.SetDrainFlag(False)
logging.info("Starting the master daemons on the new master")
result = rpc.BootstrapRunner().call_node_start_master_daemons(
new_master, no_voting)
msg = result.fail_msg
if msg:
logging.error(
"Could not start the master role on the new master"
" %s, please check: %s", new_master, msg)
rcode = 1
# Finally verify that the new master managed to set up the master IP
# and warn if it didn't.
try:
utils.Retry(_check_ip, (1, 1.5, 5), total_timeout, args=[True])
except utils.RetryTimeout:
warning = ("The master IP did not come up within %s seconds; the"
" cluster should still be working and reachable via %s,"
" but not via the master IP address" %
(total_timeout, new_master))
logging.warning("%s", warning)
warnings.append(warning)
rcode = 1
logging.info("Master failed over from %s to %s", old_master, new_master)
return rcode, warnings
