mirror of
https://github.com/ceph/ceph
synced 2024-12-25 04:43:17 +00:00
269 lines
8.1 KiB
Python
269 lines
8.1 KiB
Python
"""
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Task to run tests with network delay between two remotes using tc and netem.
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Reference:https://wiki.linuxfoundation.org/networking/netem.
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"""
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import logging
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import contextlib
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from paramiko import SSHException
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import socket
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import time
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import gevent
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import argparse
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log = logging.getLogger(__name__)
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def set_priority(interface):
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# create a priority queueing discipline
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return ['sudo', 'tc', 'qdisc', 'add', 'dev', interface, 'root', 'handle', '1:', 'prio']
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def show_tc(interface):
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# shows tc device present
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return ['sudo', 'tc', 'qdisc', 'show', 'dev', interface]
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def del_tc(interface):
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return ['sudo', 'tc', 'qdisc', 'del', 'dev', interface, 'root']
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def cmd_prefix(interface):
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# prepare command to set delay
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cmd1 = ['sudo', 'tc', 'qdisc', 'add', 'dev', interface, 'parent',
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'1:1', 'handle', '2:', 'netem', 'delay']
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# prepare command to change delay
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cmd2 = ['sudo', 'tc', 'qdisc', 'replace', 'dev', interface, 'root', 'netem', 'delay']
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# prepare command to apply filter to the matched ip/host
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cmd3 = ['sudo', 'tc', 'filter', 'add', 'dev', interface,
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'parent', '1:0', 'protocol', 'ip', 'pref', '55',
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'handle', '::55', 'u32', 'match', 'ip', 'dst']
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return cmd1, cmd2, cmd3
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def static_delay(remote, host, interface, delay):
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""" Sets a constant delay between two hosts to emulate network delays using tc qdisc and netem"""
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set_delay, change_delay, set_ip = cmd_prefix(interface)
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ip = socket.gethostbyname(host.hostname)
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tc = remote.sh(show_tc(interface))
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if tc.strip().find('refcnt') == -1:
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# call set_priority() func to create priority queue
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# if not already created(indicated by -1)
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log.info('Create priority queue')
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remote.run(args=set_priority(interface))
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# set static delay, with +/- 5ms jitter with normal distribution as default
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log.info('Setting delay to %s' % delay)
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set_delay.extend(['%s' % delay, '5ms', 'distribution', 'normal'])
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remote.run(args=set_delay)
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# set delay to a particular remote node via ip
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log.info('Delay set on %s' % remote)
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set_ip.extend(['%s' % ip, 'flowid', '2:1'])
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remote.run(args=set_ip)
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else:
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# if the device is already created, only change the delay
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log.info('Setting delay to %s' % delay)
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change_delay.extend(['%s' % delay, '5ms', 'distribution', 'normal'])
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remote.run(args=change_delay)
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def variable_delay(remote, host, interface, delay_range=[]):
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""" Vary delay between two values"""
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set_delay, change_delay, set_ip = cmd_prefix(interface)
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ip = socket.gethostbyname(host.hostname)
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# delay1 has to be lower than delay2
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delay1 = delay_range[0]
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delay2 = delay_range[1]
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tc = remote.sh(show_tc(interface))
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if tc.strip().find('refcnt') == -1:
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# call set_priority() func to create priority queue
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# if not already created(indicated by -1)
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remote.run(args=set_priority(interface))
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# set variable delay
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log.info('Setting varying delay')
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set_delay.extend(['%s' % delay1, '%s' % delay2])
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remote.run(args=set_delay)
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# set delay to a particular remote node via ip
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log.info('Delay set on %s' % remote)
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set_ip.extend(['%s' % ip, 'flowid', '2:1'])
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remote.run(args=set_ip)
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else:
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# if the device is already created, only change the delay
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log.info('Setting varying delay')
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change_delay.extend(['%s' % delay1, '%s' % delay2])
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remote.run(args=change_delay)
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def delete_dev(remote, interface):
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""" Delete the qdisc if present"""
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log.info('Delete tc')
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tc = remote.sh(show_tc(interface))
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if tc.strip().find('refcnt') != -1:
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remote.run(args=del_tc(interface))
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class Toggle:
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stop_event = gevent.event.Event()
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def __init__(self, ctx, remote, host, interface, interval):
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self.ctx = ctx
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self.remote = remote
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self.host = host
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self.interval = interval
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self.interface = interface
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self.ip = socket.gethostbyname(self.host.hostname)
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def packet_drop(self):
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""" Drop packets to the remote ip specified"""
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_, _, set_ip = cmd_prefix(self.interface)
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tc = self.remote.sh(show_tc(self.interface))
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if tc.strip().find('refcnt') == -1:
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self.remote.run(args=set_priority(self.interface))
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# packet drop to specific ip
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log.info('Drop all packets to %s' % self.host)
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set_ip.extend(['%s' % self.ip, 'action', 'drop'])
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self.remote.run(args=set_ip)
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def link_toggle(self):
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"""
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For toggling packet drop and recovery in regular interval.
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If interval is 5s, link is up for 5s and link is down for 5s
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"""
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while not self.stop_event.is_set():
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self.stop_event.wait(timeout=self.interval)
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# simulate link down
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try:
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self.packet_drop()
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log.info('link down')
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except SSHException:
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log.debug('Failed to run command')
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self.stop_event.wait(timeout=self.interval)
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# if qdisc exist,delete it.
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try:
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delete_dev(self.remote, self.interface)
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log.info('link up')
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except SSHException:
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log.debug('Failed to run command')
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def begin(self, gname):
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self.thread = gevent.spawn(self.link_toggle)
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self.ctx.netem.names[gname] = self.thread
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def end(self, gname):
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self.stop_event.set()
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log.info('gname is {}'.format(self.ctx.netem.names[gname]))
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self.ctx.netem.names[gname].get()
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def cleanup(self):
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"""
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Invoked during unwinding if the test fails or exits before executing task 'link_recover'
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"""
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log.info('Clean up')
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self.stop_event.set()
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self.thread.get()
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@contextlib.contextmanager
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def task(ctx, config):
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"""
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- netem:
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clients: [c1.rgw.0]
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iface: eno1
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dst_client: [c2.rgw.1]
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delay: 10ms
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- netem:
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clients: [c1.rgw.0]
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iface: eno1
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dst_client: [c2.rgw.1]
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delay_range: [10ms, 20ms] # (min, max)
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- netem:
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clients: [rgw.1, mon.0]
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iface: eno1
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gname: t1
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dst_client: [c2.rgw.1]
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link_toggle_interval: 10 # no unit mentioned. By default takes seconds.
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- netem:
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clients: [rgw.1, mon.0]
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iface: eno1
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link_recover: [t1, t2]
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"""
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log.info('config %s' % config)
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assert isinstance(config, dict), \
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"please list clients to run on"
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if not hasattr(ctx, 'netem'):
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ctx.netem = argparse.Namespace()
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ctx.netem.names = {}
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if config.get('dst_client') is not None:
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dst = config.get('dst_client')
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(host,) = ctx.cluster.only(dst).remotes.keys()
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for role in config.get('clients', None):
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(remote,) = ctx.cluster.only(role).remotes.keys()
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ctx.netem.remote = remote
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if config.get('delay', False):
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static_delay(remote, host, config.get('iface'), config.get('delay'))
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if config.get('delay_range', False):
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variable_delay(remote, host, config.get('iface'), config.get('delay_range'))
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if config.get('link_toggle_interval', False):
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log.info('Toggling link for %s' % config.get('link_toggle_interval'))
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global toggle
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toggle = Toggle(ctx, remote, host, config.get('iface'), config.get('link_toggle_interval'))
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toggle.begin(config.get('gname'))
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if config.get('link_recover', False):
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log.info('Recovering link')
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for gname in config.get('link_recover'):
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toggle.end(gname)
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log.info('sleeping')
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time.sleep(config.get('link_toggle_interval'))
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delete_dev(ctx.netem.remote, config.get('iface'))
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del ctx.netem.names[gname]
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try:
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yield
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finally:
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if ctx.netem.names:
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toggle.cleanup()
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for role in config.get('clients'):
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(remote,) = ctx.cluster.only(role).remotes.keys()
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delete_dev(remote, config.get('iface'))
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