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diff --git a/collectors/python.d.plugin/dns_query_time/Makefile.inc b/collectors/python.d.plugin/dns_query_time/Makefile.inc new file mode 100644 index 0000000..7eca3e0 --- /dev/null +++ b/collectors/python.d.plugin/dns_query_time/Makefile.inc @@ -0,0 +1,13 @@ +# SPDX-License-Identifier: GPL-3.0-or-later + +# THIS IS NOT A COMPLETE Makefile +# IT IS INCLUDED BY ITS PARENT'S Makefile.am +# IT IS REQUIRED TO REFERENCE ALL FILES RELATIVE TO THE PARENT + +# install these files +dist_python_DATA += dns_query_time/dns_query_time.chart.py +dist_pythonconfig_DATA += dns_query_time/dns_query_time.conf + +# do not install these files, but include them in the distribution +dist_noinst_DATA += dns_query_time/README.md dns_query_time/Makefile.inc + diff --git a/collectors/python.d.plugin/dns_query_time/README.md b/collectors/python.d.plugin/dns_query_time/README.md new file mode 100644 index 0000000..e1fde74 --- /dev/null +++ b/collectors/python.d.plugin/dns_query_time/README.md @@ -0,0 +1,29 @@ +<!-- +title: "DNS query RTT monitoring with Netdata" +custom_edit_url: https://github.com/netdata/netdata/edit/master/collectors/python.d.plugin/dns_query_time/README.md +sidebar_label: "DNS query RTT" +--> + +# DNS query RTT monitoring with Netdata + +Measures DNS query round trip time. + +**Requirement:** + +- `python-dnspython` package + +It produces one aggregate chart or one chart per DNS server, showing the query time. + +## Configuration + +Edit the `python.d/dns_query_time.conf` configuration file using `edit-config` from the Netdata [config +directory](/docs/configure/nodes.md), which is typically at `/etc/netdata`. + +```bash +cd /etc/netdata # Replace this path with your Netdata config directory, if different +sudo ./edit-config python.d/dns_query_time.conf +``` + +--- + +[](<>) diff --git a/collectors/python.d.plugin/dns_query_time/dns_query_time.chart.py b/collectors/python.d.plugin/dns_query_time/dns_query_time.chart.py new file mode 100644 index 0000000..7e1cb32 --- /dev/null +++ b/collectors/python.d.plugin/dns_query_time/dns_query_time.chart.py @@ -0,0 +1,149 @@ +# -*- coding: utf-8 -*- +# Description: dns_query_time netdata python.d module +# Author: ilyam8 +# SPDX-License-Identifier: GPL-3.0-or-later + +from random import choice +from socket import getaddrinfo, gaierror +from threading import Thread + +try: + import dns.message + import dns.query + import dns.name + + DNS_PYTHON = True +except ImportError: + DNS_PYTHON = False + +try: + from queue import Queue +except ImportError: + from Queue import Queue + +from bases.FrameworkServices.SimpleService import SimpleService + +update_every = 5 + + +class Service(SimpleService): + def __init__(self, configuration=None, name=None): + SimpleService.__init__(self, configuration=configuration, name=name) + self.order = list() + self.definitions = dict() + self.timeout = self.configuration.get('response_timeout', 4) + self.aggregate = self.configuration.get('aggregate', True) + self.domains = self.configuration.get('domains') + self.server_list = self.configuration.get('dns_servers') + + def check(self): + if not DNS_PYTHON: + self.error("'python-dnspython' package is needed to use dns_query_time.chart.py") + return False + + self.timeout = self.timeout if isinstance(self.timeout, int) else 4 + + if not all([self.domains, self.server_list, + isinstance(self.server_list, str), isinstance(self.domains, str)]): + self.error("server_list and domain_list can't be empty") + return False + else: + self.domains, self.server_list = self.domains.split(), self.server_list.split() + + for ns in self.server_list: + if not check_ns(ns): + self.info('Bad NS: %s' % ns) + self.server_list.remove(ns) + if not self.server_list: + return False + + data = self._get_data(timeout=1) + + down_servers = [s for s in data if data[s] == -100] + for down in down_servers: + down = down[3:].replace('_', '.') + self.info('Removed due to non response %s' % down) + self.server_list.remove(down) + if not self.server_list: + return False + + self.order, self.definitions = create_charts(aggregate=self.aggregate, server_list=self.server_list) + return True + + def _get_data(self, timeout=None): + return dns_request(self.server_list, timeout or self.timeout, self.domains) + + +def dns_request(server_list, timeout, domains): + threads = list() + que = Queue() + result = dict() + + def dns_req(ns, t, q): + domain = dns.name.from_text(choice(domains)) + request = dns.message.make_query(domain, dns.rdatatype.A) + + try: + resp = dns.query.udp(request, ns, timeout=t) + if (resp.rcode() == dns.rcode.NOERROR and resp.answer): + query_time = resp.time * 1000 + else: + query_time = -100 + except dns.exception.Timeout: + query_time = -100 + finally: + q.put({'_'.join(['ns', ns.replace('.', '_')]): query_time}) + + for server in server_list: + th = Thread(target=dns_req, args=(server, timeout, que)) + th.start() + threads.append(th) + + for th in threads: + th.join() + result.update(que.get()) + + return result + + +def check_ns(ns): + try: + return getaddrinfo(ns, 'domain')[0][4][0] + except gaierror: + return False + + +def create_charts(aggregate, server_list): + if aggregate: + order = ['dns_group'] + definitions = { + 'dns_group': { + 'options': [None, 'DNS Response Time', 'ms', 'name servers', 'dns_query_time.response_time', 'line'], + 'lines': [] + } + } + for ns in server_list: + dim = [ + '_'.join(['ns', ns.replace('.', '_')]), + ns, + 'absolute', + ] + definitions['dns_group']['lines'].append(dim) + + return order, definitions + else: + order = [''.join(['dns_', ns.replace('.', '_')]) for ns in server_list] + definitions = dict() + + for ns in server_list: + definitions[''.join(['dns_', ns.replace('.', '_')])] = { + 'options': [None, 'DNS Response Time', 'ms', ns, 'dns_query_time.response_time', 'area'], + 'lines': [ + [ + '_'.join(['ns', ns.replace('.', '_')]), + ns, + 'absolute', + ] + ] + } + return order, definitions diff --git a/collectors/python.d.plugin/dns_query_time/dns_query_time.conf b/collectors/python.d.plugin/dns_query_time/dns_query_time.conf new file mode 100644 index 0000000..9c0838e --- /dev/null +++ b/collectors/python.d.plugin/dns_query_time/dns_query_time.conf @@ -0,0 +1,69 @@ +# netdata python.d.plugin configuration for dns_query_time +# +# This file is in YaML format. Generally the format is: +# +# name: value +# +# There are 2 sections: +# - global variables +# - one or more JOBS +# +# JOBS allow you to collect values from multiple sources. +# Each source will have its own set of charts. +# +# JOB parameters have to be indented (using spaces only, example below). + +# ---------------------------------------------------------------------- +# Global Variables +# These variables set the defaults for all JOBs, however each JOB +# may define its own, overriding the defaults. + +# update_every sets the default data collection frequency. +# If unset, the python.d.plugin default is used. +# update_every: 1 + +# priority controls the order of charts at the netdata dashboard. +# Lower numbers move the charts towards the top of the page. +# If unset, the default for python.d.plugin is used. +# priority: 60000 + +# penalty indicates whether to apply penalty to update_every in case of failures. +# Penalty will increase every 5 failed updates in a row. Maximum penalty is 10 minutes. +# penalty: yes + +# autodetection_retry sets the job re-check interval in seconds. +# The job is not deleted if check fails. +# Attempts to start the job are made once every autodetection_retry. +# This feature is disabled by default. +# autodetection_retry: 0 + +# ---------------------------------------------------------------------- +# JOBS (data collection sources) +# +# The default JOBS share the same *name*. JOBS with the same name +# are mutually exclusive. Only one of them will be allowed running at +# any time. This allows autodetection to try several alternatives and +# pick the one that works. +# +# Any number of jobs is supported. +# +# All python.d.plugin JOBS (for all its modules) support a set of +# predefined parameters. These are: +# +# job_name: +# name: myname # the JOB's name as it will appear at the +# # dashboard (by default is the job_name) +# # JOBs sharing a name are mutually exclusive +# update_every: 1 # the JOB's data collection frequency +# priority: 60000 # the JOB's order on the dashboard +# penalty: yes # the JOB's penalty +# autodetection_retry: 0 # the JOB's re-check interval in seconds +# +# Additionally to the above, dns_query_time also supports the following: +# +# dns_servers: 'dns servers' # List of dns servers to query +# domains: 'domains' # List of domains +# aggregate: yes/no # Aggregate all servers in one chart or not +# response_timeout: 4 # Dns query response timeout (query = -100 if response time > response_time) +# +# ----------------------------------------------------------------------
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