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MQTT for Sysadmins

MQTT for Sysadmins

Jan-Piet Mens

April 05, 2014

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  1. MQTT for sysadmins and for fun Jan-Piet Mens April 2014

  2. @jpmens: consultant, author, architect, part-time admin, small-scale fiddler, loves LDAP,

    DNS, plain text, and things that work.
  3. MQTT is a standard, a transport, PUB/SUB messaging, designed for

    unreliable networks
  4. transport protocol binary payload, 256MB, (+2 bytes) , fast, lightweight,

    ideal for low- bandwith, high-latency networks
  5. security TLS authentication ACLs TLS-PSK (payload encryption)

  6. Quality of Service 0 At most once 1 Assured delivery

    2 Once only
  7. more features keepalive last will & testament

  8. compare HTTP ? request/response, verbose, push, poll, nobody hears clients

  9. PUB/SUB decoupled senders recipients: flexibility one producer to many (changing)

    consumers no queueing broker can hold messages until subscriber reconnects durable (retain) Last Will and Testament single TCP port (easy on firewalls)
  10. topic names UTF-8, hierarchical, wildcards temperature/room/living devices/# finance/+/eur/rate

  11. PUB/SUB cauldron

  12. MQTT brokers the server bit of MQTT

  13. Mosquitto C, fast, lightweight, ACLs (plugin), TLS, TLS-PSK, bridge, logging

    via $SYS http://mosquitto.org
  14. HiveMQ Java, plugins, Websockets, clustering, modules http://hivemq.com

  15. more brokers RSMB, Mosca, Apollo, RabbitMQ

  16. MQTT brokers $SYS topic $SYS/broker/clients/total 1771 $SYS/broker/messages/received 36597465 $SYS/broker/messages/sent 39714120

    $SYS/broker/messages/stored 2941 $SYS/broker/bytes/received 2830787008 $SYS/broker/bytes/sent 3810653433 $SYS/broker/version mosquitto version 1.2 $SYS/broker/publish/messages/received 19798673 $SYS/broker/publish/messages/sent 30622855 $SYS/broker/publish/bytes/received 1868229299 $SYS/broker/publish/bytes/sent 3185942282
  17. bridging

  18. CLI utilities mosquitto_sub -v [-h localhost] [-p 1883] [--cafile file]

    [--cert file --key file] [-u username [-P password]] [ --tls-version tlsv1.2 ] -t 'topic/#' subscribe publish mosquitto_pub ... [-r] -m payload
  19. languages Lua, Python, C, JavaScript, Perl, Ruby, Java, ...

  20. Python API: PUB #!/usr/bin/env python import paho.mqtt.publish as mqtt mqtt.single('conf/hello',

    'Hello MQTT') $ mosquitto_sub -h localhost -v -t 'conf/#' conf/hello Hello MQTT payload topic
  21. Python API: SUB #!/usr/bin/env python import paho.mqtt.client as paho def

    on_connect(mosq, userdata, rc): mqttc.subscribe("conf/+", 0) def on_message(mosq, userdata, msg): print "%s %s" % (msg.topic, str(msg.payload)) mqttc = paho.Client() mqttc.on_connect = on_connect mqttc.on_message = on_message mqttc.connect("localhost", 1883, 60) mqttc.loop_forever() callbacks
  22. Python API: SUB $ mosquitto_pub -t 'conf/thirsty' -m 'Beertime?' $

    mosquitto_pub -t 'conf/catering' -m 'Coffee is ready' $ ./sub.py conf/thirsty Beertime? conf/catering Coffee is ready
  23. devices

  24. devices

  25. practical solutions alerting, metering, logging, location awareness, tracking, automation, and

  26. MQTT out there Github (notifications), power metering, trains, FaceBook messenger,

    connected cars, temperature monitoring, host monitoring (load)
  27. system utilities Ansible (notifications), Fluentd (logging), Diamond (system metrics), mqtt-watchdir,

    Jenkins, (build logs),
  28. database persistence SUB and store in any SQL or NoSQL

  29. alerting: mqttwarn https://github.com/jpmens/mqttwarn

  30. job control, reporting https://gist.github.com/jpmens/7101170 $ mosquitto_sub -v -t 'processes/#' processes/run.sh

    Starting processes/run.sh Still running processes/monitor/spec1 Starting processes/run.sh Still going strong at Tue Oct 22 15:49:07 CEST 2013 processes/run.sh That's it, folks!
  31. WebSockets HiveMQ, WSS, lighttpd mod_websocket

  32. WebSockets http://www.hivemq.com/demos/websocket-client/

  33. None
  34. None
  35. Node-RED http://nodered.org

  36. mqtt.org @mqttorg