晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/lib/python3.6/site-packages/sos/report/plugins/conntrack.py
# Copyright (C) 2017 Red Hat, Inc., Marcus Linden <mlinden@redhat.com>
# This file is part of the sos project: https://github.com/sosreport/sos
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
# version 2 of the GNU General Public License.
#
# See the LICENSE file in the source distribution for further information.

from sos.report.plugins import (Plugin, IndependentPlugin, SoSPredicate,
                                PluginOpt)


class Conntrack(Plugin, IndependentPlugin):

    short_desc = 'conntrack - netfilter connection tracking'

    plugin_name = 'conntrack'
    profiles = ('network', 'cluster')
    packages = ('conntrack-tools', 'conntrack', 'conntrackd')

    option_list = [
        PluginOpt("namespaces", default=None, val_type=int,
                  desc="Number of namespaces to collect, 0 for unlimited"),
    ]

    def setup(self):
        # Collect info from conntrackd
        self.add_copy_spec("/etc/conntrackd/conntrackd.conf")
        self.add_cmd_output([
            "conntrackd -s network",
            "conntrackd -s cache",
            "conntrackd -s runtime",
            "conntrackd -s link",
            "conntrackd -s rsqueue",
            "conntrackd -s queue",
            "conntrackd -s ct",
            "conntrackd -s expect",
        ])

        # Collect info from conntrack, only when all required kmods are loaded
        ct_pred = SoSPredicate(self,
                               kmods=['nf_conntrack',
                                      'nf_conntrack_netlink',
                                      'nf_defrag_ipv4',
                                      'nf_defrag_ipv6',
                                      'nfnetlink'],
                               required={'kmods': 'all'})
        self.add_cmd_output([
            "conntrack -L -o extended",
            "conntrack -S",
        ], pred=ct_pred)

        # Capture additional data from namespaces; each command is run
        # per-namespace
        cmd_prefix = "ip netns exec "
        nsps = self.get_option('namespaces')
        for namespace in self.get_network_namespaces(ns_max=nsps):
            ns_cmd_prefix = cmd_prefix + namespace + " "
            self.add_cmd_output(ns_cmd_prefix + "conntrack -L -o extended")
            self.add_cmd_output(ns_cmd_prefix + "conntrack -S")

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