1 / 42

Hobbit – Monitoring that works

Hobbit Monitor Linuxforum 2007 March 3 rd 2007 Henrik Storner <henrik@hobbitmon.com>. Hobbit – Monitoring that works. Agenda. Hobbit history What does “monitoring” mean? Demo / Screen shots Architecture: The Hobbit components Hobbit server Network server monitoring

rangle
Télécharger la présentation

Hobbit – Monitoring that works

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Hobbit Monitor Linuxforum 2007 March 3rd 2007 Henrik Storner <henrik@hobbitmon.com> Hobbit – Monitoring that works

  2. Agenda • Hobbit history • What does “monitoring” mean? • Demo / Screen shots • Architecture: The Hobbit components • Hobbit server • Network server monitoring • Server monitoring with the clients • Setting it up: Quick tour of the configuration • Custom checks • Hobbit at the CSC Copenhagen data center • Future

  3. Hobbit history • In 2001, CSC's Managed Web Services division had no monitoring of websites, only box-monitoring with Unicenter/TNG. • Enter Big Brother – the UI is great, but BB is written in Korn shell and is slooooow! • bbgen toolkit (2002) eliminated some slow parts of BB, but kept the BB daemon. • Hobbit (2005) is mostly compatible with BB but has a completely different architecture. • Hobbit contains no BB parts.

  4. What does “monitoring” mean? • Availability: Can I access the website? • Performance: ... without getting bored ? • Capacity: ... when we triple the number of users? It is vital that you know which of these questions you must answer. The main focus for Hobbit is availability (but there's a bit of the others thrown in)

  5. A small demo Hobbit overview

  6. Hobbit architecture • 1 Hobbit server holds all current data, i.e. the status of everything we monitor. • Usually, the Hobbit server also hosts the web interface, and runs tasks which take care of storing history- and trend-data. • 1+ servers perform network tests, and reports the results to the Hobbit server (may be the same) • Clients collect data from each monitored server, and send it to the Hobbit server for analysis.

  7. The Hobbit server • Stores current data in RAM only, and never does any slow disk I/O or process forking • Historical and trend data stored on disk • Core hobbitd daemon feeds server tasks via an IPC “channel”, using shared memory • Server tasks handle e.g. client data analysis, trend data updates, and alerting • Some tasks can be distributed on multiple servers (e.g. client data analysis) • Extensible – you can write your own tasks, e.g. a task that stores all measurements in a database.

  8. Hobbit web interface • Overview pages are static HTML, rebuilt once a minute with the current status data. • Detailed status pages are dynamically generated • “Critical Systems” view is dynamic • Will probably switch to an all-dynamic setup • The web UI is not particularly attractive or flexible, so web designers are welcome! • Some customization is possible by modifying header- and footer-files

  9. Network service monitoring • ping : Is the server alive ? • Connect : Will it accept new connections ? • Service : Is the network service running ? • Application : Is it working ? • It is easy to check that the service is running because it uses a standard protocol (eg HTTP) • But the end-user only cares about the application!

  10. Webserver says it's “200 OK” Check the actual data returned !

  11. And the devil's in the detail...

  12. AJP13 VNC clamd spamd cupsd rsync Oracle TNS listener add your own service definition Standard network tests • ping • FTP • SSH • SMTP • POP • IMAP(S) • NNTP(S) • LDAP(S) query • HTTP(S) w/ content • SSL certificate

  13. Server monitoring – Hobbit clients • Usually a “Hobbit client” runs on the server. • Clients are really dumb – they know how to collect some data, but they know nothing about interpreting the data they collect. • Runs uptime, free, df, ps, netstat, mount, who ... • Collects server-side statistics • Scans server log files for new entries • Collects data for directories and individual files • The raw data is sent to the Hobbit server for analysis.

  14. File attributes File data Directory sizes Log file data Data can be graphed Standard server tests • CPU load average • System uptime • System clock • Memory usage • Swap usage • File system usage • Process counts • Network ports

  15. Setting it up • All configuration is kept on the Hobbit server • All configuration files are text based • Uses regular expressions a lot • bb-hosts (list hosts Hobbit knows about, defines network service tests and the web page layout) • hobbit-alerts.cfg (rules for sending alerts) • hobbit-clients.cfg (rules for analyzing data from clients) • client-local.cfg (instructions for client data collection)

  16. bb-hosts # # Master configuration file for Hobbit # group My hosts 127.0.0.1 localhost # bbd http://localhost/ 192.168.1.1 demohost # pop3 http://127.0.0.1/ smtp \ cont=Login;https://www/Login.php;Please.*userid

  17. hobbit-alerts.cfg HOST=demohost SERVICE=http MAIL henrik@hobbitmon.com TIME=W:0800:2200 SERVICE=http MAIL webadmin@hobbitmon.com SCRIPT /usr/local/bin/smsalert +4512345678

  18. hobbit-clients.cfg HOST=* DISK / 80 90 EXHOST=backup.foo.com HOST=db.foo.com DISK %/data/ IGNORE HOST=%web[1-9] PROC apache MIN=4 MAX=20 DIR /var/log/apache SIZE<100000 TRACK yellow FILE /var/www/index.html \ MD5=dd2cf7192db28919203eef126943b

  19. client-local.cfg # This file tell clients what file/log data to report [linux] log:/var/log/messages [web1] dir:/var/log/apache file:/var/www/default.html:md5

  20. Why server-side analysis? • Managing configuration files on each monitored server is impossible when you have 2000 clients. • Bulk configuration updates are much easier • Configuration settings can apply to groups of hosts • Adding new analysis tools only requires upgrading the Hobbit server – not all of the clients (provided they already collect the necessary data, of course) • Having RAW data available is USEFUL. • Only downside: Your Hobbit server must spend some cpu time analyzing the raw client data

  21. Custom checks • Custom checks normally check something, then send a red/yellow/green “status” message • A check can run locally on a host as part of the client installation • A check can run centrally and pull data from several hosts (eg. grabbing data with SNMP) • A check can run on the Hobbit server, using data that has already been collected (“combo-tests” or extra client-data analysis) • Numeric data can be tracked in graphs

  22. Simple client-side check #!/bin/bash COLUMN=weather; COLOR=green DEGREES=`/usr/local/bin/getweather temperature` if [ $DEGREES -ge 30 ]; then COLOR=red; fi $BB $BBDISP \ “status $MACHINE.$COLUMN $COLOR `date` temperature=$DEGREES” exit 0

  23. Server-side checks • You can hook modules into all kinds of Hobbit data: Status messages, data collected from Hobbit clients and so on. • E.g. Hobbit clients run “who” to report who is logged on. • To monitor for a root login on all servers only takes is 62 lines of Perl (see hobbitd_rootlogin.pl in source)

  24. Windows, SNMP and other stuff • Windows client: BBWinNote: Does not support central configuration • SNMP add-on: Devmon • Both are OSS, available on Sourceforge.net • Other add-ons available, e.g. for database monitoring. • Add-ons for Big Brother (available from deadcat.net) can be used – but check licensing

  25. Hobbit@CSC - Summary • The Copenhagen data center is the largest CSC data center in EMEA, globally in the top 5. • Hobbit/BBWin/BB clients on 90% of all servers. • Hobbit is considered mission-critical. • Lots of network tests, especially for Web- and middleware systems (J2EE and LDAP) • Web application monitoring done through customer-built “monitoring” web pages

  26. Hobbit@CSC – Multiple views • Multiple sets of web pages with Hobbit data: • One set grouped by account manager, then by account: Lets the account manager quickly see if his customers are running OK • One set grouped by sysadmin group, then by account: Lets the system administrators quickly see what servers need attention • One set for customers who want access to Hobbit • The “Critical Systems” view is monitored 24x7

  27. Hobbit@CSC - reports • Availability reports pre-generated for daily, weekly and monthly availability • Reports and detailed history available on-line for 3 months • Monthly reports available for 12 months • Graphs clean-up automatically, provide data for 1½ years (1 day average)

  28. 3.800 hosts 28.000 statuses 9.500.000 updates/day= 111 updates/second 3.100 network tests 40.000 webpages/day 27.000 RRD files = ~160.000 RRD datasets 8.500 RRD graphs/day Hobbit@CSC: Statistics • 1 Web / 2 net serversSun E220R server450 Mhz Ultrasparc II1 GB RAM2x72 GB SCSI disk • 1 RRD serverHP DL3803 Ghz Xeon1 GB RAM2x72 GB SCSI disk

  29. Hobbit@CSC :Load on main server

  30. Future work • Load balancing of Hobbit tasks: 4.3.0 • Graph updates and viewing • History log storage • Client data analysis • Network checks • High availability ? Maybe not ... can be handled externally • Re-design the web UI – any volunteers ? • Automated web checking of a full user session, perhaps using Mozilla or Konqueror

  31. Questions ? The End

More Related