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| </head> |
| <body class="article"> |
| <div id="header"> |
| </div> |
| <div id="content"> |
| <div class="paragraph"> |
| <p><a id="serviceability"></a></p> |
| </div> |
| <div class="sect1"> |
| <h2 id="_serviceability_and_diagnostics">Serviceability and Diagnostics</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Virgo supports two kinds of logging: <strong>Event Logging</strong> and <strong>Trace logging</strong> which is usually referred |
| to simply as <strong>Logging</strong>. The difference between Event Logging and Logging is explained below, but both are configured in the |
| <code>serviceability.xml</code> file in the <code>configuration</code> directory. This file takes the form of a Logback configuration, Virgo |
| uses a Logback implementation behind the SLF4J logging interface.</p> |
| </div> |
| <div class="paragraph"> |
| <p>For a description of the syntax and facilities provided by <code>serviceability.xml</code> |
| see the <strong>Logback</strong> documentation (referenced in <a href="#furtherreading">[furtherreading]</a>).</p> |
| </div> |
| <div class="paragraph"> |
| <p><a id="serviceability-info-log"></a></p> |
| </div> |
| <div class="sect2"> |
| <h3 id="_event_logging">Event Logging</h3> |
| <div class="paragraph"> |
| <p>Event logging records important events in Virgo. Each event is logged to |
| an event log file and is accompanied by a code enclosed in angle brackets. |
| An example is shown below:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>[2010-10-25 16:20:45.897] system-artifacts <TC0010I> Creating HTTP/1.1 connector with scheme http on port 8080.</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>(For a description of the log code syntax, see <a href="#log-codes">[log-codes]</a>.) |
| The format of event log messages is fully configurable.</p> |
| </div> |
| <div class="paragraph"> |
| <p>By default, event log messages are stored in <code>$SERVER_HOME/serviceability/eventlogs/eventlog.log</code>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The default behaviour is that, once <code>eventlog.log</code> reaches a 10Mb limit, it rolls into a series of files named |
| <code>eventlog_</code><strong>i</strong><code>.log</code> where <strong>i</strong> ranges from 1 to 4, and event logging continues in |
| a new <code>eventlog.log</code> file.</p> |
| </div> |
| <div class="paragraph"> |
| <p><a id="serviceability-info-trace"></a></p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="__trace_logging">(Trace) Logging</h3> |
| <div class="paragraph"> |
| <p>The Virgo’s (trace) logging support serves two main purposes:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>It provides global trace files that capture high-volume information regarding the Virgo’s internal events. |
| The files are intended for use by support personnel to diagnose runtime problems.</p> |
| </li> |
| <li> |
| <p>It provides application trace files that contain application-generated output. This includes output generated using popular logging and |
| tracing APIs including the OSGi LogService, as well as output generated by calls to <code>System.out</code> and <code>System.err</code>. |
| These files are intended for use by application developers and system administrators. An application is defined as a scope so a single bundle will |
| not get its own log file unless it is a Web application Bundle or is included in a scoped plan or a par file.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>By default, the Virgo trace file is called <code>$SERVER_HOME/serviceability/logs/log.log</code>, |
| and, again by default, the application trace files are called <code>$SERVER_HOME/serviceability/logs/</code><strong>application_name</strong> |
| <code>/log.log</code>, where <strong>application_name</strong> is automatically set by Virgo for each application artifact |
| installed and run (it is a combination of the artifact name and the version).</p> |
| </div> |
| <div class="paragraph"> |
| <p>The default behaviour of these trace files is that, once <code>log.log</code> reaches a 10Mb limit, it rolls into a series of files named |
| <code>log_</code><strong>i</strong><code>.log</code> where <strong>i</strong> ranges from 1 to 4, and logging continues in |
| a new <code>log.log</code> file.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Entries in trace files are by default of the form <timestamp> <thread-name> <source> <level> <entry-text>. For example:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>[2008-05-15 09:09:46.940] server-dm-2 org.apache.coyote.http11.Http11Protocol I Initializing Coyote HTTP/1.1 on http-48080</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>although this format is completely determined by the Logback configuration file <code>serviceability.xml</code>.</p> |
| </div> |
| <div class="paragraph"> |
| <p><a id="serviceability-info-trace-app"></a></p> |
| </div> |
| <div class="sect3"> |
| <h4 id="_application_output">Application Output</h4> |
| <div class="paragraph"> |
| <p>Virgo provides advanced support for capturing and tracing application-generated output by automatically separating trace output on a |
| per-application basis and will also capture any <code>System.out</code> and <code>System.err</code> output.</p> |
| </div> |
| <div class="paragraph"> |
| <p><a id="per-application-trace"></a></p> |
| </div> |
| </div> |
| <div class="sect3"> |
| <h4 id="_per_application_trace">Per-application trace</h4> |
| <div class="paragraph"> |
| <p>Virgo uses SLF4J interfaces to Logback, and the root logger (by default) captures all logging output |
| and appends it to the application-specific trace files as described above. |
| To modify this, define application-specific loggers in the <code>serviceability.xml</code> file in the normal way.</p> |
| </div> |
| <div class="paragraph"> |
| <p><a id="sysout-and-syserr"></a></p> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_system_out_and_system_err">System.out and System.err</h3> |
| <div class="paragraph"> |
| <p><code>System.out</code> and <code>System.err</code> output from applications is, by default, captured in the |
| application’s trace file. |
| This happens because the output streams are intercepted and written to the loggers named |
| <code>System.out</code> and <code>System.err</code> respectively. |
| Since there are no explicit loggers defined with these names in the <code>serviceability.xml</code> file, |
| this output is logged by the root logger (which captures <code>INFO</code> level and above).</p> |
| </div> |
| <div class="paragraph"> |
| <p>The capture of <code>System.out</code> and <code>System.err</code> output is configured in the |
| <code>configuration/org.eclipse.virgo.medic.properties</code> file by the <code>log.wrapSysOut</code> and |
| <code>log.wrapSysErr</code> properties. By default the properties have a value of <code>true</code> |
| and capture is enabled. Capture can be disabled by configuring the properties with a value of <code>false</code>. |
| The third and last accepted value is <code>tee</code> which captures the System streams output in the logs |
| while at the same time allows printing output to the System streams. Thus this output will appear both in the logs |
| and in the System stream output - an example could be the Equinox console, launched with <code>-console</code> startup argument.</p> |
| </div> |
| <div class="admonitionblock important"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <div class="title">Important</div> |
| </td> |
| <td class="content"> |
| <div class="paragraph"> |
| <p>If you provide value different than 'true | tee | false' then the server will default to 'tee' and print out a warning.</p> |
| </div> |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>The trace entries for <code>System.out</code> and <code>System.err</code> |
| output are of the form:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>[2008-05-16 09:28:45.874] server-tomcat-thread-1 System.out Hello world! |
| [2008-05-16 09:28:45.874] server-tomcat-thread-1 System.err Hello world!</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The third column indicates where the output came from (<code>System.out</code> or <code>System.err</code>).</p> |
| </div> |
| <div class="paragraph"> |
| <p>To over-ride this behaviour, simply define explicit loggers named <code>System.out</code> |
| and/or <code>System.err</code> in the configuration file to send this output to an appender of your choice. |
| Be aware that all applications' output streams will be caught by these loggers, and that a sifting appender might be useful to separate them.</p> |
| </div> |
| <div class="paragraph"> |
| <p><a id="janino"></a></p> |
| </div> |
| <div class="sect3"> |
| <h4 id="_janino">Janino</h4> |
| <div class="paragraph"> |
| <p>Janino can be used to define trace filters as Java expressions. This adds a significant overhead to tracing, so should be used with care.</p> |
| </div> |
| <div class="paragraph"> |
| <p>For example, the addition of the following filter element to the sifting appender in <code>serviceability.xml</code> |
| suppresses per-application trace output that is not associated with a particular application and is normally written to |
| <code>serviceability/logs/virgo-kernel/log.log</code>.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-xml" data-lang="xml"><appender name="SIFTED_LOG_FILE" class="ch.qos.logback.classic.sift.SiftingAppender"> |
| <discriminator> |
| <Key>applicationName</Key> |
| <DefaultValue>virgo-kernel</DefaultValue> |
| </discriminator> |
| <sift> |
| <appender name="${applicationName}_LOG_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"> |
| <filter class="ch.qos.logback.core.filter.EvaluatorFilter"> |
| <evaluator class="ch.qos.logback.classic.boolex.JaninoEventEvaluator"> |
| <expression> |
| (mdc == null) || (mdc.get("applicationName") == null) |
| </expression> |
| </evaluator> |
| <OnMismatch>NEUTRAL</OnMismatch> |
| <OnMatch>DENY</OnMatch> |
| </filter> |
| <file>serviceability/logs/${applicationName}/log.log</file> |
| ... |
| </appender> |
| </sift> |
| </appender></code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>To enable Janino in Virgo, place the Janino and commons compiler JARs, converted to OSGi bundles, in <code>plugins</code>. |
| For example these bundles are available at v2.6.1 from the SpringSource Enterprise Bundle Repository. |
| Then add the following lines to |
| <code>configuration/org.eclipse.equinox.simpleconfigurator/bundles.info</code> |
| (as described in <a href="#configuring-framework-bundles">Configuring OSGi Framework Bundles</a>):</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-txt" data-lang="txt">com.springsource.org.codehaus.janino,2.6.1,plugins/com.springsource.org.codehaus.janino-2.6.1.jar,4,false |
| com.springsource.org.codehaus.commons.compiler,2.6.1,plugins/com.springsource.org.codehaus.commons.compiler-2.6.1.jar,4,false]]></programlisting></code></pre> |
| </div> |
| </div> |
| <div class="admonitionblock important"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <div class="title">Important</div> |
| </td> |
| <td class="content"> |
| <div class="paragraph"> |
| <p>Current versions of Logback, including 0.9.28 to 1.0, do not set Janino’s "parent" class loader correctly. |
| This bug is covered by the Logback issue <a href="http://jira.qos.ch/browse/LBCORE-244">LBCORE-244</a>. |
| With such versions, it is necessary to attach a fragment bundle to Janino. Place the fragment bundle in <code>plugins</code> and list it in |
| <code>configuration/org.eclipse.equinox.simpleconfigurator/bundles.info</code>. |
| The fragment’s contents are described in <a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=333920#c15">bug 333920</a>.</p> |
| </div> |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p><a id="serviceability-info-dump"></a></p> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_service_dumps">Service Dumps</h3> |
| <div class="paragraph"> |
| <p>A service dump is triggered when one of the following events |
| occurs:</p> |
| </div> |
| <div class="olist arabic"> |
| <ol class="arabic"> |
| <li> |
| <p>A failure is detected in the Virgo code, or</p> |
| </li> |
| <li> |
| <p>a thread deadlock is detected.</p> |
| </li> |
| </ol> |
| </div> |
| <div class="paragraph"> |
| <p>A service dump contains a snapshot of all the important state from |
| the running Virgo instance. This snapshot is not intended |
| for end user consumption but is useful for service personnel.</p> |
| </div> |
| <div class="paragraph"> |
| <p>By default, service dumps are created in <code>$SERVER_HOME/serviceability/dump</code>.</p> |
| </div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div id="footer"> |
| <div id="footer-text"> |
| Last updated 2017-02-08 16:40:17 +01:00 |
| </div> |
| </div> |
| </body> |
| </html> |
