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But packing it all into + one class make the implementation of individual plugins much faster. + """ + + STATUS_NAMES = ['OK', 'WARNING', 'CRITICAL', 'UNKNOWN'] + + def __init__(self, name): + self.name_ = name + self.status_ = 0 + self.message_ = "empty message" + self.perf_data_ = {} + + def collect(self): + """ Called from run() to actually ollect monitored information. """ + raise NotImplementedError("Re-implement in subclass!") + + def add_perf_data(self, name, value): + """ Add performance data. """ + self.perf_data_[name] = value + + def get_perf_data(self, name): + """ Get performance data. """ + return self.perf_data_[name] + + def set_message(self, msg): + """ Set the main plugin message. """ + self.message_ = msg + + def set_message_from_perf(self, msg): + """ Set the main plugin message with {placeholders} from perf data. """ + self.set_message(msg.format(**self.perf_data_)) + + def worsen_to_warning(self): + """ Final plugin status would be warning or worse. """ + if self.status_ == 0: + self.status_ = 1 + + def worsen_to_critical(self): + """ Final plugin status would be critical. """ + if (self.status_ == 0) or (self.status_ == 1): + self.status_ = 2 + + # pylint: disable=no-self-use + def read_file(self, filename): + """ Read given file and return list of its lines (rstripped). """ + with open(filename, "r") as inp: + for line in inp: + yield line.rstrip() + + # pylint: disable=no-self-use + def read_command_output(self, cmd): + """ Run given command and return list of lines on stdout (rstripped). """ + with subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT) as proc: + for line in proc.stdout: + yield line.decode('utf-8').rstrip() + proc.wait() + + # pylint: disable=no-self-use + def grep_lines(self, regexp, lines): + """ Return lines matching regular expression. """ + for line in lines: + res = regexp.search(line) + if res is not None: + yield res + + def contains_line(self, regexp, lines): + """ Returns whether some line matches regular expression. """ + try: + next(self.grep_lines(regexp, lines)) + return True + except StopIteration: + return False + + def run(self): + """ Main of the plugin that does the work. """ + self.collect() + status_name = NagiosPluginBase.STATUS_NAMES[self.status_] + print("{name} {status} - {message}{perf}".format( + name=self.name_, + status=status_name, + message=self.message_, + perf=self.format_perf_data_())) + + def format_perf_data_(self): + """ Formats performance data as CSV. """ + if not self.perf_data_: + return "" + res = [] + for key, value in self.perf_data_.items(): + res.append("{}={}".format(key, value)) + return "|{}".format(",".join(res)) diff --git a/d3s/nagios_plugins/__init__.py b/d3s/nagios_plugins/__init__.py new file mode 100644 index 0000000..e69de29 diff --git a/d3s/nagios_plugins/check_health.py b/d3s/nagios_plugins/check_health.py new file mode 100755 index 0000000..504b784 --- /dev/null +++ b/d3s/nagios_plugins/check_health.py @@ -0,0 +1,95 @@ +#!/usr/bin/env python3 + +# +# Copyright 2019 Vojtech Horky +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +# + +""" +Checks basic system health, useful for collecting basic stats. + +Usage: + + +Example output: + + HEALTH OK - up 1 day, 0.79 load, 1 ready tasks|\ + mem_total_kb=16300840,mem_avail_kb=9947436,\ + load_1min=0.39,load_5min=0.79,load_15min=0.86,\ + tasks_runnable=1,tasks_total=952,\ + uptime=1 day + +""" + +import re +from d3s.nagios import NagiosPluginBase + + +class CheckHealth(NagiosPluginBase): + """ + Collects basic information about running Linux system. + + There are not critical/warning limits as its main purpose is to collect + basic system information for later processing via perf data section. + """ + + MEM_INFO_RE = re.compile('^([^:]*):[ \t]*([0-9]*) kB$') + LOAD_AVG_RE = re.compile(''' + ^([0-9.]+) # 1 min + \\s+ + ([0-9.]+) # 5 min + \\s+ + ([0-9.]+) # 15 min + \\s+ + ([0-9]+)/([0-9]+) # runnable/total tasks in the system + \\s+.*$ # ignore rest of line + ''', re.VERBOSE) + UPTIME_RE = re.compile('^.*up[ \t]+([^,]*),.*$') + + def __init__(self): + NagiosPluginBase.__init__(self, 'HEALTH') + + def collect(self): + # Read memory information + for entry in self.grep_lines(CheckHealth.MEM_INFO_RE, self.read_file('/proc/meminfo')): + key = entry.group(1) + value = entry.group(2) + if key == 'MemTotal': + self.add_perf_data('mem_total_kb', value) + elif key == 'MemAvailable': + self.add_perf_data('mem_avail_kb', value) + + # Get load average + entry = next(self.grep_lines(CheckHealth.LOAD_AVG_RE, self.read_file('/proc/loadavg'))) + self.add_perf_data('load_1min', entry.group(1)) + self.add_perf_data('load_5min', entry.group(2)) + self.add_perf_data('load_15min', entry.group(3)) + self.add_perf_data('tasks_runnable', entry.group(4)) + self.add_perf_data('tasks_total', entry.group(5)) + + # Read uptime information + entry = next(self.grep_lines(CheckHealth.UPTIME_RE, self.read_command_output(['uptime']))) + self.add_perf_data('uptime', entry.group(1)) + + # Format final message + self.set_message_from_perf("up {uptime}, {load_5min} load, {tasks_runnable} ready tasks") + +def main(): + """ + Module main for execution from shell script. + """ + CheckHealth().run() + +if __name__ == '__main__': + main() diff --git a/d3s/nagios_plugins/check_systemd_service.py b/d3s/nagios_plugins/check_systemd_service.py new file mode 100755 index 0000000..5e68864 --- /dev/null +++ b/d3s/nagios_plugins/check_systemd_service.py @@ -0,0 +1,93 @@ +#!/usr/bin/env python3 + +# +# Copyright 2019 Vojtech Horky +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +# + +""" +Checks that systemd unit is enabled and running. + +Usage: + --service UNIT + +Example output: + + SRV OK - httpd running, 12.6M, 6 tasks|\ + service_name=httpd,service_tasks=6,service_memory=12.6M + +""" + +import re +import argparse +from d3s.nagios import NagiosPluginBase + + +class CheckSystemdService(NagiosPluginBase): + """ + Checks that given service is running and enabled. + """ + + DETAILS_BASE_RE = re.compile(''' + ^\\s+(Tasks|Memory): + \\s+ + ([^ \t]+) + .*$ + ''', re.VERBOSE) + + def __init__(self): + NagiosPluginBase.__init__(self, 'SRV') + parser = argparse.ArgumentParser() + parser.add_argument('--service', dest='service', metavar='UNIT', required=True) + args = parser.parse_args() + self.service = args.service + + def collect(self): + self.add_perf_data('service_name', self.service) + + is_enabled_output = self.read_command_output(['systemctl', 'is-enabled', self.service]) + is_enabled = self.contains_line(re.compile('^enabled$'), is_enabled_output) + if not is_enabled: + self.worsen_to_warning() + + is_active_output = self.read_command_output(['systemctl', 'is-active', self.service]) + is_active = self.contains_line(re.compile('^active$'), is_active_output) + if not is_active: + self.worsen_to_critical() + + status_output = self.read_command_output(['systemctl', 'status', self.service]) + for line in self.grep_lines(CheckSystemdService.DETAILS_BASE_RE, status_output): + key = line.group(1) + if key == 'Tasks': + self.add_perf_data('service_tasks', line.group(2)) + elif key == 'Memory': + self.add_perf_data('service_memory', line.group(2)) + + details = ', {service_memory}, {service_tasks} tasks' + if not is_active: + self.set_message_from_perf('{service_name} not running') + elif not is_enabled: + self.set_message_from_perf('{service_name} running but not enabled' + details) + else: + self.set_message_from_perf('{service_name} running' + details) + + +def main(): + """ + Module main for execution from shell script. + """ + CheckSystemdService().run() + +if __name__ == '__main__': + main() diff --git a/setup.py b/setup.py new file mode 100755 index 0000000..499576c --- /dev/null +++ b/setup.py @@ -0,0 +1,48 @@ +#!/usr/bin/env python3 + +# +# Copyright 2019 Vojtech Horky +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +# + +from setuptools import setup + +def get_readme(): + with open('README.md') as f: + return f.read() + +setup( + name='d3s-nagios-plugins', + version='0.1', + description='Collection of various Nagios plugins', + long_description=get_readme(), + classifiers=[ + 'Programming Language :: Python :: 3.6', + ], + keywords='nagios monitoring', + url='https://lab.d3s.mff.cuni.cz/nagios-plugins/', + install_requires=[], + include_package_data=True, + zip_safe=False, + packages=[ + 'd3s', + 'd3s.nagios_plugins', + ], + entry_points={ + 'console_scripts': [ + 'nagios_d3s_check_health=d3s.nagios_plugins.check_health:main', + 'nagios_d3s_check_systemd_service=d3s.nagios_plugins.check_systemd_service:main', + ], + }, +)