def get_failover_flow(self, role=constants.ROLE_STANDALONE,
load_balancer=None):
"""Creates a flow to failover a stale amphora
:returns: The flow for amphora failover
"""
failover_amphora_flow = linear_flow.Flow(
constants.FAILOVER_AMPHORA_FLOW)
failover_amphora_flow.add(lifecycle_tasks.AmphoraToErrorOnRevertTask(
rebind={constants.AMPHORA: constants.FAILED_AMPHORA},
requires=constants.AMPHORA))
failover_amphora_flow.add(network_tasks.FailoverPreparationForAmphora(
rebind={constants.AMPHORA: constants.FAILED_AMPHORA},
requires=constants.AMPHORA))
# Note: It seems intuitive to boot an amphora prior to deleting
# the old amphora, however this is a complicated issue.
# If the target host (due to anit-affinity) is resource
# constrained, this will fail where a post-delete will
# succeed. Since this is async with the API it would result
# in the LB ending in ERROR though the amps are still alive.
# Consider in the future making this a complicated
# try-on-failure-retry flow, or move upgrade failovers to be
# synchronous with the API. For now spares pool and act/stdby
# will mitigate most of this delay.
# Delete the old amphora
failover_amphora_flow.add(
database_tasks.MarkAmphoraPendingDeleteInDB(
rebind={constants.AMPHORA: constants.FAILED_AMPHORA},
requires=constants.AMPHORA))
failover_amphora_flow.add(
database_tasks.MarkAmphoraHealthBusy(
rebind={constants.AMPHORA: constants.FAILED_AMPHORA},
requires=constants.AMPHORA))
failover_amphora_flow.add(compute_tasks.ComputeDelete(
rebind={constants.AMPHORA: constants.FAILED_AMPHORA},
requires=constants.AMPHORA))
failover_amphora_flow.add(network_tasks.WaitForPortDetach(
rebind={constants.AMPHORA: constants.FAILED_AMPHORA},
requires=constants.AMPHORA))
failover_amphora_flow.add(database_tasks.MarkAmphoraDeletedInDB(
rebind={constants.AMPHORA: constants.FAILED_AMPHORA},
requires=constants.AMPHORA))
# If this is an unallocated amp (spares pool), we're done
if not load_balancer:
failover_amphora_flow.add(
database_tasks.DisableAmphoraHealthMonitoring(
rebind={constants.AMPHORA: constants.FAILED_AMPHORA},
requires=constants.AMPHORA))
return failover_amphora_flow
# Save failed amphora details for later
failover_amphora_flow.add(
database_tasks.GetAmphoraDetails(
rebind={constants.AMPHORA: constants.FAILED_AMPHORA},
requires=constants.AMPHORA,
provides=constants.AMP_DATA))
# Get a new amphora
# Note: Role doesn't matter here. We will update it later.
get_amp_subflow = self.get_amphora_for_lb_subflow(
prefix=constants.FAILOVER_AMPHORA_FLOW)
failover_amphora_flow.add(get_amp_subflow)
# Update the new amphora with the failed amphora details
failover_amphora_flow.add(database_tasks.UpdateAmpFailoverDetails(
requires=(constants.AMPHORA, constants.AMP_DATA)))
# Update the data stored in the flow from the database
failover_amphora_flow.add(database_tasks.ReloadLoadBalancer(
requires=constants.LOADBALANCER_ID,
provides=constants.LOADBALANCER))
failover_amphora_flow.add(database_tasks.ReloadAmphora(
requires=constants.AMPHORA,
provides=constants.AMPHORA))
# Prepare to reconnect the network interface(s)
failover_amphora_flow.add(network_tasks.GetAmphoraeNetworkConfigs(
requires=constants.LOADBALANCER,
provides=constants.AMPHORAE_NETWORK_CONFIG))
failover_amphora_flow.add(database_tasks.GetListenersFromLoadbalancer(
requires=constants.LOADBALANCER, provides=constants.LISTENERS))
failover_amphora_flow.add(database_tasks.GetAmphoraeFromLoadbalancer(
requires=constants.LOADBALANCER, provides=constants.AMPHORAE))
# Plug the VIP ports into the new amphora
# The reason for moving these steps here is the udp listeners want to
# do some kernel configuration before Listener update for forbidding
# failure during rebuild amphora.
failover_amphora_flow.add(network_tasks.PlugVIPPort(
requires=(constants.AMPHORA, constants.AMPHORAE_NETWORK_CONFIG)))
failover_amphora_flow.add(amphora_driver_tasks.AmphoraPostVIPPlug(
requires=(constants.AMPHORA, constants.LOADBALANCER,
constants.AMPHORAE_NETWORK_CONFIG)))
# Listeners update needs to be run on all amphora to update
# their peer configurations. So parallelize this with an
# unordered subflow.
update_amps_subflow = unordered_flow.Flow(
constants.UPDATE_AMPS_SUBFLOW)
timeout_dict = {
constants.CONN_MAX_RETRIES:
CONF.haproxy_amphora.active_connection_max_retries,
constants.CONN_RETRY_INTERVAL:
CONF.haproxy_amphora.active_connection_rety_interval}
# Setup parallel flows for each amp. We don't know the new amp
# details at flow creation time, so setup a subflow for each
# amp on the LB, they let the task index into a list of amps
# to find the amphora it should work on.
amp_index = 0
db_lb = self.lb_repo.get(db_apis.get_session(),
id=load_balancer[constants.LOADBALANCER_ID])
for amp in db_lb.amphorae:
if amp.status == constants.DELETED:
continue
update_amps_subflow.add(
amphora_driver_tasks.AmpListenersUpdate(
name=constants.AMP_LISTENER_UPDATE + '-' + str(amp_index),
requires=(constants.LOADBALANCER, constants.AMPHORAE),
inject={constants.AMPHORA_INDEX: amp_index,
constants.TIMEOUT_DICT: timeout_dict}))
amp_index += 1
failover_amphora_flow.add(update_amps_subflow)
# Plug the member networks into the new amphora
failover_amphora_flow.add(network_tasks.CalculateAmphoraDelta(
requires=(constants.LOADBALANCER, constants.AMPHORA),
provides=constants.DELTA))
failover_amphora_flow.add(network_tasks.HandleNetworkDelta(
requires=(constants.AMPHORA, constants.DELTA),
provides=constants.ADDED_PORTS))
failover_amphora_flow.add(amphora_driver_tasks.AmphoraePostNetworkPlug(
requires=(constants.LOADBALANCER, constants.ADDED_PORTS)))
failover_amphora_flow.add(database_tasks.ReloadLoadBalancer(
name='octavia-failover-LB-reload-2',
requires=constants.LOADBALANCER_ID,
provides=constants.LOADBALANCER))
# Handle the amphora role and VRRP if necessary
if role == constants.ROLE_MASTER:
failover_amphora_flow.add(database_tasks.MarkAmphoraMasterInDB(
name=constants.MARK_AMP_MASTER_INDB,
requires=constants.AMPHORA))
vrrp_subflow = self.get_vrrp_subflow(role)
failover_amphora_flow.add(vrrp_subflow)
elif role == constants.ROLE_BACKUP:
failover_amphora_flow.add(database_tasks.MarkAmphoraBackupInDB(
name=constants.MARK_AMP_BACKUP_INDB,
requires=constants.AMPHORA))
vrrp_subflow = self.get_vrrp_subflow(role)
failover_amphora_flow.add(vrrp_subflow)
elif role == constants.ROLE_STANDALONE:
failover_amphora_flow.add(
database_tasks.MarkAmphoraStandAloneInDB(
name=constants.MARK_AMP_STANDALONE_INDB,
requires=constants.AMPHORA))
failover_amphora_flow.add(amphora_driver_tasks.ListenersStart(
requires=(constants.LOADBALANCER, constants.AMPHORA)))
failover_amphora_flow.add(
database_tasks.DisableAmphoraHealthMonitoring(
rebind={constants.AMPHORA: constants.FAILED_AMPHORA},
requires=constants.AMPHORA))
return failover_amphora_flow
def get_amphora_for_lb_failover_subflow(
self, prefix, role=constants.ROLE_STANDALONE,
failed_amp_vrrp_port_id=None, is_vrrp_ipv6=False):
"""Creates a new amphora that will be used in a failover flow.
:requires: loadbalancer_id, flavor, vip, vip_sg_id, loadbalancer
:provides: amphora_id, amphora
:param prefix: The flow name prefix to use on the flow and tasks.
:param role: The role this amphora will have in the topology.
:param failed_amp_vrrp_port_id: The base port ID of the failed amp.
:param is_vrrp_ipv6: True if the base port IP is IPv6.
:return: A Taskflow sub-flow that will create the amphora.
"""
sf_name = prefix + '-' + constants.CREATE_AMP_FOR_FAILOVER_SUBFLOW
amp_for_failover_flow = linear_flow.Flow(sf_name)
# Try to allocate or boot an amphora instance (unconfigured)
amp_for_failover_flow.add(self.get_amphora_for_lb_subflow(
prefix=prefix + '-' + constants.FAILOVER_LOADBALANCER_FLOW,
role=role))
# Create the VIP base (aka VRRP) port for the amphora.
amp_for_failover_flow.add(network_tasks.CreateVIPBasePort(
name=prefix + '-' + constants.CREATE_VIP_BASE_PORT,
requires=(constants.VIP, constants.VIP_SG_ID,
constants.AMPHORA_ID),
provides=constants.BASE_PORT))
# Attach the VIP base (aka VRRP) port to the amphora.
amp_for_failover_flow.add(compute_tasks.AttachPort(
name=prefix + '-' + constants.ATTACH_PORT,
requires=(constants.AMPHORA, constants.PORT),
rebind={constants.PORT: constants.BASE_PORT}))
# Update the amphora database record with the VIP base port info.
amp_for_failover_flow.add(database_tasks.UpdateAmpFailoverDetails(
name=prefix + '-' + constants.UPDATE_AMP_FAILOVER_DETAILS,
requires=(constants.AMPHORA, constants.VIP, constants.BASE_PORT)))
# Update the amphora networking for the plugged VIP port
amp_for_failover_flow.add(network_tasks.GetAmphoraNetworkConfigsByID(
name=prefix + '-' + constants.GET_AMPHORA_NETWORK_CONFIGS_BY_ID,
requires=(constants.LOADBALANCER_ID, constants.AMPHORA_ID),
provides=constants.AMPHORAE_NETWORK_CONFIG))
# Disable the base (vrrp) port on the failed amphora
# This prevents a DAD failure when bringing up the new amphora.
# Keepalived will handle this for act/stdby.
if (role == constants.ROLE_STANDALONE and failed_amp_vrrp_port_id and
is_vrrp_ipv6):
amp_for_failover_flow.add(network_tasks.AdminDownPort(
name=prefix + '-' + constants.ADMIN_DOWN_PORT,
inject={constants.PORT_ID: failed_amp_vrrp_port_id}))
amp_for_failover_flow.add(amphora_driver_tasks.AmphoraPostVIPPlug(
name=prefix + '-' + constants.AMPHORA_POST_VIP_PLUG,
requires=(constants.AMPHORA, constants.LOADBALANCER,
constants.AMPHORAE_NETWORK_CONFIG)))
# Plug member ports
amp_for_failover_flow.add(network_tasks.CalculateAmphoraDelta(
name=prefix + '-' + constants.CALCULATE_AMPHORA_DELTA,
requires=(constants.LOADBALANCER, constants.AMPHORA,
constants.AVAILABILITY_ZONE, constants.VRRP_PORT),
rebind={constants.VRRP_PORT: constants.BASE_PORT},
provides=constants.DELTA))
amp_for_failover_flow.add(network_tasks.HandleNetworkDelta(
name=prefix + '-' + constants.HANDLE_NETWORK_DELTA,
requires=(constants.AMPHORA, constants.DELTA),
provides=constants.ADDED_PORTS))
amp_for_failover_flow.add(amphora_driver_tasks.AmphoraePostNetworkPlug(
name=prefix + '-' + constants.AMPHORAE_POST_NETWORK_PLUG,
requires=(constants.LOADBALANCER, constants.ADDED_PORTS)))
return amp_for_failover_flow