def get_create_all_listeners_flow(self): """Create a flow to create all listeners :returns: The flow for creating all listeners """ create_all_listeners_flow = linear_flow.Flow( constants.CREATE_LISTENERS_FLOW) create_all_listeners_flow.add( database_tasks.GetListenersFromLoadbalancer( requires=constants.LOADBALANCER, provides=constants.LISTENERS)) create_all_listeners_flow.add(database_tasks.ReloadLoadBalancer( requires=constants.LOADBALANCER_ID, provides=constants.LOADBALANCER)) create_all_listeners_flow.add(amphora_driver_tasks.ListenersUpdate( requires=[constants.LOADBALANCER, constants.LISTENERS])) create_all_listeners_flow.add(network_tasks.UpdateVIP( requires=constants.LOADBALANCER)) return create_all_listeners_flow
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