| __author__ = 'Administrator' | |
| import urllib2 | |
| import logging | |
| from mininet.node import OVSSwitch | |
| import ast | |
| import time | |
| from prometheus_client import start_http_server, Summary, Histogram, Gauge, Counter, REGISTRY, CollectorRegistry, \ | |
| pushadd_to_gateway, push_to_gateway, delete_from_gateway | |
| import threading | |
| from subprocess import Popen, PIPE | |
| import os | |
| import paramiko | |
| import gevent | |
| logging.basicConfig(level=logging.INFO) | |
| """ | |
| class to read openflow stats from the Ryu controller of the DCNetwork | |
| """ | |
| class DCNetworkMonitor(): | |
| def __init__(self, net): | |
| self.net = net | |
| prometheus_ip = '127.0.0.1' | |
| prometheus_port = '9090' | |
| self.prometheus_REST_api = 'http://{0}:{1}'.format(prometheus_ip, prometheus_port) | |
| # helper variables to calculate the metrics | |
| self.pushgateway = 'localhost:9091' | |
| # Start up the server to expose the metrics to Prometheus. | |
| #start_http_server(8000) | |
| # supported Prometheus metrics | |
| self.registry = CollectorRegistry() | |
| self.prom_tx_packet_count = Gauge('sonemu_tx_count_packets', 'Total number of packets sent', | |
| ['vnf_name', 'vnf_interface', 'flow_id'], registry=self.registry) | |
| self.prom_rx_packet_count = Gauge('sonemu_rx_count_packets', 'Total number of packets received', | |
| ['vnf_name', 'vnf_interface', 'flow_id'], registry=self.registry) | |
| self.prom_tx_byte_count = Gauge('sonemu_tx_count_bytes', 'Total number of bytes sent', | |
| ['vnf_name', 'vnf_interface', 'flow_id'], registry=self.registry) | |
| self.prom_rx_byte_count = Gauge('sonemu_rx_count_bytes', 'Total number of bytes received', | |
| ['vnf_name', 'vnf_interface', 'flow_id'], registry=self.registry) | |
| self.prom_metrics={'tx_packets':self.prom_tx_packet_count, 'rx_packets':self.prom_rx_packet_count, | |
| 'tx_bytes':self.prom_tx_byte_count,'rx_bytes':self.prom_rx_byte_count} | |
| # list of installed metrics to monitor | |
| # each entry can contain this data | |
| ''' | |
| { | |
| switch_dpid = 0 | |
| vnf_name = None | |
| vnf_interface = None | |
| previous_measurement = 0 | |
| previous_monitor_time = 0 | |
| metric_key = None | |
| mon_port = None | |
| } | |
| ''' | |
| self.monitor_lock = threading.Lock() | |
| self.monitor_flow_lock = threading.Lock() | |
| self.network_metrics = [] | |
| self.flow_metrics = [] | |
| # start monitoring thread | |
| self.start_monitoring = True | |
| self.monitor_thread = threading.Thread(target=self.get_network_metrics) | |
| self.monitor_thread.start() | |
| self.monitor_flow_thread = threading.Thread(target=self.get_flow_metrics) | |
| self.monitor_flow_thread.start() | |
| # helper tools | |
| #self.pushgateway_process = self.start_PushGateway() | |
| #self.prometheus_process = self.start_Prometheus() | |
| self.cadvisor_process = self.start_cadvisor() | |
| # first set some parameters, before measurement can start | |
| def setup_flow(self, vnf_name, vnf_interface=None, metric='tx_packets', cookie=0): | |
| flow_metric = {} | |
| # check if port is specified (vnf:port) | |
| if vnf_interface is None: | |
| # take first interface by default | |
| connected_sw = self.net.DCNetwork_graph.neighbors(vnf_name)[0] | |
| link_dict = self.net.DCNetwork_graph[vnf_name][connected_sw] | |
| vnf_interface = link_dict[0]['src_port_id'] | |
| flow_metric['vnf_name'] = vnf_name | |
| flow_metric['vnf_interface'] = vnf_interface | |
| vnf_switch = None | |
| for connected_sw in self.net.DCNetwork_graph.neighbors(vnf_name): | |
| link_dict = self.net.DCNetwork_graph[vnf_name][connected_sw] | |
| for link in link_dict: | |
| # logging.info("{0},{1}".format(link_dict[link],vnf_interface)) | |
| if link_dict[link]['src_port_id'] == vnf_interface: | |
| # found the right link and connected switch | |
| # logging.info("{0},{1}".format(link_dict[link]['src_port_id'], vnf_source_interface)) | |
| vnf_switch = connected_sw | |
| flow_metric['mon_port'] = link_dict[link]['dst_port_nr'] | |
| break | |
| if not vnf_switch: | |
| logging.exception("vnf switch of {0}:{1} not found!".format(vnf_name, vnf_interface)) | |
| return "vnf switch of {0}:{1} not found!".format(vnf_name, vnf_interface) | |
| try: | |
| # default port direction to monitor | |
| if metric is None: | |
| metric = 'tx_packets' | |
| next_node = self.net.getNodeByName(vnf_switch) | |
| if not isinstance(next_node, OVSSwitch): | |
| logging.info("vnf: {0} is not connected to switch".format(vnf_name)) | |
| return | |
| flow_metric['previous_measurement'] = 0 | |
| flow_metric['previous_monitor_time'] = 0 | |
| flow_metric['switch_dpid'] = int(str(next_node.dpid), 16) | |
| flow_metric['metric_key'] = metric | |
| flow_metric['cookie'] = cookie | |
| self.monitor_flow_lock.acquire() | |
| self.flow_metrics.append(flow_metric) | |
| self.monitor_flow_lock.release() | |
| logging.info('Started monitoring flow:{3} {2} on {0}:{1}'.format(vnf_name, vnf_interface, metric, cookie)) | |
| return 'Started monitoring flow:{3} {2} on {0}:{1}'.format(vnf_name, vnf_interface, metric, cookie) | |
| except Exception as ex: | |
| logging.exception("setup_metric error.") | |
| return ex.message | |
| def stop_flow(self, vnf_name, vnf_interface=None, metric=None, cookie=0): | |
| for flow_dict in self.flow_metrics: | |
| if flow_dict['vnf_name'] == vnf_name and flow_dict['vnf_interface'] == vnf_interface \ | |
| and flow_dict['metric_key'] == metric and flow_dict['cookie'] == cookie: | |
| self.monitor_flow_lock.acquire() | |
| self.flow_metrics.remove(flow_dict) | |
| for collector in self.registry._collectors: | |
| if (vnf_name, vnf_interface, cookie) in collector._metrics: | |
| #logging.info('2 name:{0} labels:{1} metrics:{2}'.format(collector._name, collector._labelnames, | |
| # collector._metrics)) | |
| collector.remove(vnf_name, vnf_interface, cookie) | |
| delete_from_gateway(self.pushgateway, job='sonemu-SDNcontroller') | |
| self.monitor_flow_lock.release() | |
| logging.info('Stopped monitoring flow {3}: {2} on {0}:{1}'.format(vnf_name, vnf_interface, metric, cookie)) | |
| return 'Stopped monitoring flow {3}: {2} on {0}:{1}'.format(vnf_name, vnf_interface, metric, cookie) | |
| # first set some parameters, before measurement can start | |
| def setup_metric(self, vnf_name, vnf_interface=None, metric='tx_packets'): | |
| network_metric = {} | |
| # check if port is specified (vnf:port) | |
| if vnf_interface is None: | |
| # take first interface by default | |
| connected_sw = self.net.DCNetwork_graph.neighbors(vnf_name)[0] | |
| link_dict = self.net.DCNetwork_graph[vnf_name][connected_sw] | |
| vnf_interface = link_dict[0]['src_port_id'] | |
| network_metric['vnf_name'] = vnf_name | |
| network_metric['vnf_interface'] = vnf_interface | |
| for connected_sw in self.net.DCNetwork_graph.neighbors(vnf_name): | |
| link_dict = self.net.DCNetwork_graph[vnf_name][connected_sw] | |
| for link in link_dict: | |
| # logging.info("{0},{1}".format(link_dict[link],vnf_interface)) | |
| if link_dict[link]['src_port_id'] == vnf_interface: | |
| # found the right link and connected switch | |
| # logging.info("{0},{1}".format(link_dict[link]['src_port_id'], vnf_source_interface)) | |
| network_metric['mon_port'] = link_dict[link]['dst_port_nr'] | |
| break | |
| if 'mon_port' not in network_metric: | |
| logging.exception("vnf interface {0}:{1} not found!".format(vnf_name,vnf_interface)) | |
| return "vnf interface {0}:{1} not found!".format(vnf_name,vnf_interface) | |
| try: | |
| # default port direction to monitor | |
| if metric is None: | |
| metric = 'tx_packets' | |
| vnf_switch = self.net.DCNetwork_graph.neighbors(str(vnf_name)) | |
| if len(vnf_switch) > 1: | |
| logging.info("vnf: {0} has multiple ports".format(vnf_name)) | |
| return | |
| elif len(vnf_switch) == 0: | |
| logging.info("vnf: {0} is not connected".format(vnf_name)) | |
| return | |
| else: | |
| vnf_switch = vnf_switch[0] | |
| next_node = self.net.getNodeByName(vnf_switch) | |
| if not isinstance(next_node, OVSSwitch): | |
| logging.info("vnf: {0} is not connected to switch".format(vnf_name)) | |
| return | |
| network_metric['previous_measurement'] = 0 | |
| network_metric['previous_monitor_time'] = 0 | |
| network_metric['switch_dpid'] = int(str(next_node.dpid), 16) | |
| network_metric['metric_key'] = metric | |
| self.monitor_lock.acquire() | |
| self.network_metrics.append(network_metric) | |
| self.monitor_lock.release() | |
| logging.info('Started monitoring: {2} on {0}:{1}'.format(vnf_name, vnf_interface, metric)) | |
| return 'Started monitoring: {2} on {0}:{1}'.format(vnf_name, vnf_interface, metric) | |
| except Exception as ex: | |
| logging.exception("setup_metric error.") | |
| return ex.message | |
| def stop_metric(self, vnf_name, vnf_interface=None, metric=None): | |
| for metric_dict in self.network_metrics: | |
| #logging.info('start Stopped monitoring: {2} on {0}:{1}'.format(vnf_name, vnf_interface, metric_dict)) | |
| if metric_dict['vnf_name'] == vnf_name and metric_dict['vnf_interface'] == vnf_interface \ | |
| and metric_dict['metric_key'] == metric: | |
| self.monitor_lock.acquire() | |
| self.network_metrics.remove(metric_dict) | |
| #this removes the complete metric, all labels... | |
| #REGISTRY.unregister(self.prom_metrics[metric_dict['metric_key']]) | |
| #self.registry.unregister(self.prom_metrics[metric_dict['metric_key']]) | |
| for collector in self.registry._collectors : | |
| #logging.info('name:{0} labels:{1} metrics:{2}'.format(collector._name, collector._labelnames, collector._metrics)) | |
| """ | |
| INFO:root:name:sonemu_rx_count_packets | |
| labels:('vnf_name', 'vnf_interface') | |
| metrics:{(u'tsrc', u'output'): < prometheus_client.core.Gauge | |
| object | |
| at | |
| 0x7f353447fd10 >} | |
| """ | |
| logging.info('{0}'.format(collector._metrics.values())) | |
| #if self.prom_metrics[metric_dict['metric_key']] | |
| if (vnf_name, vnf_interface, 'None') in collector._metrics: | |
| logging.info('2 name:{0} labels:{1} metrics:{2}'.format(collector._name, collector._labelnames, | |
| collector._metrics)) | |
| #collector._metrics = {} | |
| collector.remove(vnf_name, vnf_interface, 'None') | |
| # set values to NaN, prometheus api currently does not support removal of metrics | |
| #self.prom_metrics[metric_dict['metric_key']].labels(vnf_name, vnf_interface).set(float('nan')) | |
| # this removes the complete metric, all labels... | |
| # 1 single monitor job for all metrics of the SDN controller | |
| # we can only remove from the pushgateway grouping keys(labels) which we have defined for the add_to_pushgateway | |
| # we can not specify labels from the metrics to be removed | |
| # if we need to remove the metrics seperatelty, we need to give them a separate grouping key, and probably a diffferent registry also | |
| delete_from_gateway(self.pushgateway, job='sonemu-SDNcontroller') | |
| self.monitor_lock.release() | |
| logging.info('Stopped monitoring: {2} on {0}:{1}'.format(vnf_name, vnf_interface, metric)) | |
| return 'Stopped monitoring: {2} on {0}:{1}'.format(vnf_name, vnf_interface, metric) | |
| # delete everything from this vnf | |
| elif metric_dict['vnf_name'] == vnf_name and vnf_interface is None and metric is None: | |
| self.monitor_lock.acquire() | |
| self.network_metrics.remove(metric_dict) | |
| for collector in self.registry._collectors: | |
| collector_dict = collector._metrics.copy() | |
| for name, interface, id in collector_dict: | |
| if name == vnf_name: | |
| logging.info('3 name:{0} labels:{1} metrics:{2}'.format(collector._name, collector._labelnames, | |
| collector._metrics)) | |
| collector.remove(name, interface, 'None') | |
| delete_from_gateway(self.pushgateway, job='sonemu-SDNcontroller') | |
| self.monitor_lock.release() | |
| logging.info('Stopped monitoring vnf: {0}'.format(vnf_name)) | |
| return 'Stopped monitoring: {0}'.format(vnf_name) | |
| # get all metrics defined in the list and export it to Prometheus | |
| def get_flow_metrics(self): | |
| while self.start_monitoring: | |
| self.monitor_flow_lock.acquire() | |
| for flow_dict in self.flow_metrics: | |
| data = {} | |
| data['cookie'] = flow_dict['cookie'] | |
| if 'tx' in flow_dict['metric_key']: | |
| data['match'] = {'in_port':flow_dict['mon_port']} | |
| elif 'rx' in flow_dict['metric_key']: | |
| data['out_port'] = flow_dict['mon_port'] | |
| # query Ryu | |
| ret = self.net.ryu_REST('stats/flow', dpid=flow_dict['switch_dpid'], data=data) | |
| flow_stat_dict = ast.literal_eval(ret) | |
| #logging.info('received flow stat:{0} '.format(flow_stat_dict)) | |
| self.set_flow_metric(flow_dict, flow_stat_dict) | |
| self.monitor_flow_lock.release() | |
| time.sleep(1) | |
| def get_network_metrics(self): | |
| while self.start_monitoring: | |
| self.monitor_lock.acquire() | |
| # group metrics by dpid to optimize the rest api calls | |
| dpid_list = [metric_dict['switch_dpid'] for metric_dict in self.network_metrics] | |
| dpid_set = set(dpid_list) | |
| for dpid in dpid_set: | |
| # query Ryu | |
| ret = self.net.ryu_REST('stats/port', dpid=dpid) | |
| port_stat_dict = ast.literal_eval(ret) | |
| metric_list = [metric_dict for metric_dict in self.network_metrics | |
| if int(metric_dict['switch_dpid'])==int(dpid)] | |
| #logging.info('1set prom packets:{0} '.format(self.network_metrics)) | |
| for metric_dict in metric_list: | |
| self.set_network_metric(metric_dict, port_stat_dict) | |
| self.monitor_lock.release() | |
| time.sleep(1) | |
| # add metric to the list to export to Prometheus, parse the Ryu port-stats reply | |
| def set_network_metric(self, metric_dict, port_stat_dict): | |
| # vnf tx is the datacenter switch rx and vice-versa | |
| metric_key = self.switch_tx_rx(metric_dict['metric_key']) | |
| switch_dpid = metric_dict['switch_dpid'] | |
| vnf_name = metric_dict['vnf_name'] | |
| vnf_interface = metric_dict['vnf_interface'] | |
| previous_measurement = metric_dict['previous_measurement'] | |
| previous_monitor_time = metric_dict['previous_monitor_time'] | |
| mon_port = metric_dict['mon_port'] | |
| for port_stat in port_stat_dict[str(switch_dpid)]: | |
| if int(port_stat['port_no']) == int(mon_port): | |
| port_uptime = port_stat['duration_sec'] + port_stat['duration_nsec'] * 10 ** (-9) | |
| this_measurement = int(port_stat[metric_key]) | |
| #logging.info('set prom packets:{0} {1}:{2}'.format(this_measurement, vnf_name, vnf_interface)) | |
| # set prometheus metric | |
| self.prom_metrics[metric_dict['metric_key']].\ | |
| labels({'vnf_name': vnf_name, 'vnf_interface': vnf_interface, 'flow_id': None}).\ | |
| set(this_measurement) | |
| #push_to_gateway(self.pushgateway, job='SDNcontroller', | |
| # grouping_key={'metric':metric_dict['metric_key']}, registry=self.registry) | |
| # 1 single monitor job for all metrics of the SDN controller | |
| pushadd_to_gateway(self.pushgateway, job='sonemu-SDNcontroller', registry=self.registry) | |
| if previous_monitor_time <= 0 or previous_monitor_time >= port_uptime: | |
| metric_dict['previous_measurement'] = int(port_stat[metric_key]) | |
| metric_dict['previous_monitor_time'] = port_uptime | |
| # do first measurement | |
| #logging.info('first measurement') | |
| time.sleep(1) | |
| self.monitor_lock.release() | |
| metric_rate = self.get_network_metrics() | |
| return metric_rate | |
| else: | |
| time_delta = (port_uptime - metric_dict['previous_monitor_time']) | |
| metric_rate = (this_measurement - metric_dict['previous_measurement']) / float(time_delta) | |
| #logging.info('metric: {0} rate:{1}'.format(metric_dict['metric_key'], metric_rate)) | |
| metric_dict['previous_measurement'] = this_measurement | |
| metric_dict['previous_monitor_time'] = port_uptime | |
| return metric_rate | |
| logging.exception('metric {0} not found on {1}:{2}'.format(metric_key, vnf_name, vnf_interface)) | |
| return 'metric {0} not found on {1}:{2}'.format(metric_key, vnf_name, vnf_interface) | |
| def set_flow_metric(self, metric_dict, flow_stat_dict): | |
| # vnf tx is the datacenter switch rx and vice-versa | |
| #metric_key = self.switch_tx_rx(metric_dict['metric_key']) | |
| metric_key = metric_dict['metric_key'] | |
| switch_dpid = metric_dict['switch_dpid'] | |
| vnf_name = metric_dict['vnf_name'] | |
| vnf_interface = metric_dict['vnf_interface'] | |
| previous_measurement = metric_dict['previous_measurement'] | |
| previous_monitor_time = metric_dict['previous_monitor_time'] | |
| cookie = metric_dict['cookie'] | |
| # TODO aggregate all found flow stats | |
| flow_stat = flow_stat_dict[str(switch_dpid)][0] | |
| if 'bytes' in metric_key: | |
| counter = flow_stat['byte_count'] | |
| elif 'packet' in metric_key: | |
| counter = flow_stat['packet_count'] | |
| flow_uptime = flow_stat['duration_sec'] + flow_stat['duration_nsec'] * 10 ** (-9) | |
| self.prom_metrics[metric_dict['metric_key']]. \ | |
| labels({'vnf_name': vnf_name, 'vnf_interface': vnf_interface, 'flow_id': cookie}). \ | |
| set(counter) | |
| pushadd_to_gateway(self.pushgateway, job='sonemu-SDNcontroller', registry=self.registry) | |
| #logging.exception('metric {0} not found on {1}:{2}'.format(metric_key, vnf_name, vnf_interface)) | |
| #return 'metric {0} not found on {1}:{2}'.format(metric_key, vnf_name, vnf_interface) | |
| def query_Prometheus(self, query): | |
| ''' | |
| escaped_chars='{}[]' | |
| for old in escaped_chars: | |
| new = '\{0}'.format(old) | |
| query = query.replace(old, new) | |
| ''' | |
| url = self.prometheus_REST_api + '/' + 'api/v1/query?query=' + query | |
| #logging.info('query:{0}'.format(url)) | |
| req = urllib2.Request(url) | |
| ret = urllib2.urlopen(req).read() | |
| ret = ast.literal_eval(ret) | |
| if ret['status'] == 'success': | |
| #logging.info('return:{0}'.format(ret)) | |
| try: | |
| ret = ret['data']['result'][0]['value'] | |
| except: | |
| ret = None | |
| else: | |
| ret = None | |
| return ret | |
| def start_Prometheus(self, port=9090): | |
| # prometheus.yml configuration file is located in the same directory as this file | |
| cmd = ["docker", | |
| "run", | |
| "--rm", | |
| "-p", "{0}:9090".format(port), | |
| "-v", "{0}/prometheus.yml:/etc/prometheus/prometheus.yml".format(os.path.dirname(os.path.abspath(__file__))), | |
| "-v", "{0}/profile.rules:/etc/prometheus/profile.rules".format(os.path.dirname(os.path.abspath(__file__))), | |
| "--name", "prometheus", | |
| "prom/prometheus" | |
| ] | |
| logging.info('Start Prometheus container {0}'.format(cmd)) | |
| return Popen(cmd) | |
| def start_PushGateway(self, port=9091): | |
| cmd = ["docker", | |
| "run", | |
| "-d", | |
| "-p", "{0}:9091".format(port), | |
| "--name", "pushgateway", | |
| "prom/pushgateway" | |
| ] | |
| logging.info('Start Prometheus Push Gateway container {0}'.format(cmd)) | |
| return Popen(cmd) | |
| def start_cadvisor(self, port=8090): | |
| cmd = ["docker", | |
| "run", | |
| "--rm", | |
| "--volume=/:/rootfs:ro", | |
| "--volume=/var/run:/var/run:rw", | |
| "--volume=/sys:/sys:ro", | |
| "--volume=/var/lib/docker/:/var/lib/docker:ro", | |
| "--publish={0}:8080".format(port), | |
| "--name=cadvisor", | |
| "google/cadvisor:latest" | |
| ] | |
| logging.info('Start cAdvisor container {0}'.format(cmd)) | |
| return Popen(cmd) | |
| def stop(self): | |
| # stop the monitoring thread | |
| self.start_monitoring = False | |
| self.monitor_thread.join() | |
| self.monitor_flow_thread.join() | |
| ''' | |
| if self.prometheus_process is not None: | |
| logging.info('stopping prometheus container') | |
| self.prometheus_process.terminate() | |
| self.prometheus_process.kill() | |
| self._stop_container('prometheus') | |
| if self.pushgateway_process is not None: | |
| logging.info('stopping pushgateway container') | |
| self.pushgateway_process.terminate() | |
| self.pushgateway_process.kill() | |
| self._stop_container('pushgateway') | |
| ''' | |
| if self.cadvisor_process is not None: | |
| logging.info('stopping cadvisor container') | |
| self.cadvisor_process.terminate() | |
| self.cadvisor_process.kill() | |
| self._stop_container('cadvisor') | |
| def switch_tx_rx(self,metric=''): | |
| # when monitoring vnfs, the tx of the datacenter switch is actually the rx of the vnf | |
| # so we need to change the metric name to be consistent with the vnf rx or tx | |
| if 'tx' in metric: | |
| metric = metric.replace('tx','rx') | |
| elif 'rx' in metric: | |
| metric = metric.replace('rx','tx') | |
| return metric | |
| def _stop_container(self, name): | |
| cmd = ["docker", | |
| "stop", | |
| name] | |
| Popen(cmd).wait() | |
| cmd = ["docker", | |
| "rm", | |
| name] | |
| Popen(cmd).wait() | |
| def profile(self, mgmt_ip, rate, input_ip, vnf_uuid ): | |
| ssh = paramiko.SSHClient() | |
| ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy()) | |
| #ssh.connect(mgmt_ip, username='steven', password='test') | |
| ssh.connect(mgmt_ip, username='root', password='root') | |
| iperf_cmd = 'iperf -c {0} -u -l18 -b{1}M -t1000 &'.format(input_ip, rate) | |
| if rate > 0: | |
| stdin, stdout, stderr = ssh.exec_command(iperf_cmd) | |
| start_time = time.time() | |
| query_cpu = '(sum(rate(container_cpu_usage_seconds_total{{id="/docker/{0}"}}[{1}s])))'.format(vnf_uuid, 1) | |
| while (time.time() - start_time) < 15: | |
| data = self.query_Prometheus(query_cpu) | |
| # logging.info('rate: {1} data:{0}'.format(data, rate)) | |
| gevent.sleep(0) | |
| time.sleep(1) | |
| query_cpu2 = '(sum(rate(container_cpu_usage_seconds_total{{id="/docker/{0}"}}[{1}s])))'.format(vnf_uuid, 8) | |
| cpu_load = float(self.query_Prometheus(query_cpu2)[1]) | |
| output = 'rate: {1}Mbps; cpu_load: {0}%'.format(round(cpu_load * 100, 2), rate) | |
| output_line = output | |
| logging.info(output_line) | |
| stop_iperf = 'pkill -9 iperf' | |
| stdin, stdout, stderr = ssh.exec_command(stop_iperf) | |
| return output_line | |