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Log Files & Analyzing Tools

Log Files & Analyzing Tools. Jonathan Yip. Introducing Logs in Websphere. The first line of defense against problems Websphere provides many logs that give information about progress, status, and problems 3 Types of Format for different level of output: Basic Advanced Loganalyzer.

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Log Files & Analyzing Tools

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  1. Log Files &Analyzing Tools Jonathan Yip

  2. Introducing Logs in Websphere • The first line of defense against problems • Websphere provides many logs that give information about progress, status, and problems 3 Types of Format for different level of output: • Basic • Advanced • Loganalyzer

  3. Websphere’s Informational Logs

  4. Log File: Level of Output • Output information needed • Adjust level of output in logging property file Audit (default): Record all messages Error: Report severity errors Warning: Warning indicate a problem occurred and should be corrected. Report both severity errors or warnings

  5. Installation Logs wssetup.log • Created during processing of setup.exe • Hardware configuration • Software prerequisites present • Configuration of the Administrative Server wasdb2.log • Record the process of creation and configuration of Administrative database

  6. Administrative Server Logs 3 logs to monitor progress and errors: • _adminserverFatalError.log Serious error log • Tracefile Logs the startup and shutdown of the Administrative Server • Adminserver-stderr.log Record error during start up

  7. Application Server Logs default_server_stdout.log • Indicates failures within the Java components under Application Server • Contains exceptions thrown by the applications running under the default_server

  8. IBM HTTP Server Logs 2 logs from HTTP Server: access.log • Provides HTTP request information • Returns responses by Web server 169.254.255.129 - -[13/Feb/2002:21:11:44 –800] “GET /whole.jpg HTTP/1.1” 200 85708 • Created by CustomLog directive (Common Log Format Standard) LogFormat “%h %l %u %t \%r|” %>s %b” common

  9. IBM HTTP Server Logs (con’t) error.log • Logs any errors HTTP server encounters • ErrorLog directive to setup format Both CustomLog and ErrorLog are stored in <IBM_HTTP_HOME>\conf\httpd.conf • adminAccess.log & adminError.log provides the same logging services as the access and error logs generated by HTTP Administration service outputs

  10. Plug-in Logs native.log • Contains error and informational messages generated by the Web server plug-in • Shows information about the startup and changes applied to the server

  11. Log Analyzer • Reads error conditions in the Activity log • Analyze error conditions to provide error message explanations and, error message recovery instructions • Takes one or more activity logs merges all the data, & displays

  12. Traces • Same as Logs, but needs to be enabled • Gets additional information from IBM code base • Get operational aspects of Websphere • Options can be chosen on what to trace • If enabled, a huge system overhead generated

  13. Tracefile Log Entry Trace Log Components: Timestamp: [2/27/02 6:10:06:727 PST] Thread ID:44da7285 Component short name:StaleConnecti Level:A=Audit; W=Warning; X=Error; E=Event; D=Debug; T=Terminate; F=Fatal; I=Informational; Message:Detail information

  14. Resource Analyzer • Use to retrieve performance data from application servers • Data is collected continuously Resource Analyzer can accomplish: • View performance data in real time • Record performance information into log file • Monitor and estimate the load on application servers & the average wait time for clients • View historical performance data from the log file • View information captured in a chart • Perform a comparison evaluation for a single resource to a group of resources on a single node

  15. Represents one or more resource categories Eg. (EJB) Manipulate raw data that is collected about the application server. Data type to hold performance data Resource Analyzer Represents a physical machine Represents a server provides functionality over network manipulate the raw data that is collected about the application server.

  16. Resource Analyzer (con’t) It can collect and report performance on: • Java runtime • Database connection pools • EJBs • EJB methods • Enterprise bean object pools • Transactions • Web Applications

  17. References: Websphere Application Server Bible, Kataoka (2002) About the Websphere Resource Analyzer http://www-3.ibm.com/software/webservers/appserv/doc/v40/ae/infocenter/was/06060012.html#FIGEPMTREE-FIG Getting Started with Websphere Application Server http://www-3.ibm.com/software/webservers/appserv/doc/v40/aee/wasa_content/welcome.html

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