Monitoring your WebObjects apps

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  • 1. Monitoring your WO appsPascal Robert
  • 2. Why monitoring?• Because you want to find out problems before your customers find them!• This is not about finding bugs in your app, more about finding deployment problems.• Have to be notified about any problems, including OS, hardware and Web server problems.
  • 3. Nagios• My favorite tool for monitoring.• Been around since 1999 (was called Netsaint back in the days).• Open source (C and PERL code).• Works fine on Linux and OS X (use MacPorts to install on OS X).
  • 4. Nagios• Can monitor many things with the default plugins : HTTP, SNMP, disk space, load, etc.• Can do remote checks (checks runs on the "client", essential for things like disk space or load).• Tons of plugins on Nagios Exchange, including for RDMBS like Oracle or MySQL.• Easy to write plugins, be it in PERL, Bash, C or even Java.
  • 5. Nagios HTTP check• You can use the default "check_http" plugin.• Will check its state based on contents response, timeout, or HTTP response code (404, 500, etc.)• Can post data (might be useful for REST services).• Can specify a specific HTTP method (HEAD, OPTIONS, TRACE, PUT, DELETE, POST, GET).• Can even check if your SSL certificate is still valid!
  • 6. DEMO
  • 7. Java-specific checks• Checks with check_http are fine... but wont find some problems like "Out of memory" errors.• You can use JMX for that!
  • 8. Java-specific checks• With JMX, you can monitor things like heap memory usage, number of threads, number of loaded classes and CPU usage.• Works fine on Java 5 and 6.• Easy to enable.
  • 9. Enabling JMX in your appbash-3.2# cp /System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Home/lib/management/jmxremote.password.template /Library/WebObjects/jmxremote.passwordbash-3.2# chown appserver /Library/WebObjects/jmxremote.passwordbash-3.2# chmod 600 /Library/WebObjects/jmxremote.passwordIn your apps launch
  • 10. WO-specific checks• With WO 5.4, the stats available from WOStats are also available by JMX.• It give you access to data like memory usage, average session memory, and average requests per session.• You need to enable JMX + add one line in your Application class constructor.
  • 11. JConsole output
  • 12. Enabling WO JMX in your app import com.webobjects.appserver.WOStatisticsStore; public Application() {... registerMBean((Object)statisticsStore(), getJMXDomain(), WOStatisticsStore.class.getName());}
  • 13. check_jmx• check_jmx is a Nagios plugin to connect to JMX-enabled apps.• Written in Java, source code is available.• Sadly, it can only check results of type number or string, no hashmap support.
  • 14. DEMO
  • 15. Finding EOF deadlocks• Create two DirectActions : one that use EOF, the other pure JDBC.• Make sure the DA returns the same result everytime.• Call the DA with check_http, and validate the result.• If the JDBC check is good, but not the EOF one, good chance that you have a EOF deadlock.
  • 16. Checking wotaskd config• Nagios plugin that I wrote to check for various settings, based on the /admin direct actions available in Wonders JavaMonitor.• Useful to check settings, like if auto recover or refuse new sessions is off, number of deaths have reached a certain level or that the app is not running.• Work in progress, will release it in late September.
  • 17. Graphing• Would be nice to graph some data, like memory usage.• Lot of tools can do this (Cacti, SNMP tools, etc.), but you can do it with Nagios too.• Graphing and performance data are useful when stress loading your application with JMeter.• Look at PNP4Nagios or NagiosGraph if you want graphing.
  • 18. Sample NagiosGraph chart
  • 19. Resources• Nagios :• JMX :• check_jmx : Nagios-JMX-Plugin/details
  • 20. Q&AMonitoring your WO apps