How to enable GC logs in JBoss?

To enable GC logs, the below JVM properties will have to be given to the JVM:

-verbose:gc –Xloggc:logFileName

 Additionally if the detailed log of the GC is required, then an additional below properties will have to be passed.

 –XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=3M -XX:-TraceClassUnloading

For a domain server GC logging is not enabled for the Process Controller, Host Controller or the Servers. You will need to enable these yourself through JVM properties on the Domain Controller for the level you want (i.e. Server level, Server Group level, Host level, Domain level)

Enable GC logging at Server level through CLI  

Adding -verbose:gc parameter to specific server instance:

[domain@192.168.1.12:9999 /] /host=slave01/server-config=rpa1/jvm=jvm-rpa:add-jvm-option(jvm-option="-verbose:gc") {     "outcome" => "success",     "result" => undefined,     "server-groups" => {"undefined" => {"host" => {"slave01" => {"rpa1" => {"response" => {         "outcome" => "success",         "response-headers" => {             "operation-requires-restart" => true,             "process-state" => "restart-required"         }     }}}}}} }

Adding -Xloggc:logFileName parameter to specific server instance:

[domain@192.168.1.12:9999 /] /host=slave01/server-config=rpa1/jvm=jvm-rpa:add-jvm-option(jvm-option="-Xloggc:/u03/local/opt/jboss-eap-6.2/mydomain/slave1/servers/rpa1/log/gc.log") {     "outcome" => "success",     "result" => undefined,     "server-groups" => {"undefined" => {"host" => {"slave01" => {"rpa1" => {"response" => {         "outcome" => "success",         "response-headers" => {             "operation-requires-restart" => true,             "process-state" => "restart-required"         }    }}}}}}}

Adding XX:+PrintGCDetails parameter to specific server instance:

[domain@192.168.1.12:9999 /] /host=slave01/server-config=rpa1/jvm=jvm-rpa:add-jvm-option(jvm-option="-XX:+PrintGCDetails")                                              {              "outcome" => "success",     "result" => undefined,     "server-groups" => {"undefined" => {"host" => {"slave01" => {"rpa1" => {"response" => {         "outcome" => "success",         "response-headers" => {             "operation-requires-restart" => true,             "process-state" => "restart-required"         }     }}}}}} }

If you want to add multiple JVM arguments to server instance at a time,

The CLI command would be:

/host=slave02/server-config=rpa2/jvm=jvm-rpa:write-attribute(name=jvm-options,value=["-verbose:gc","-Xloggc:/u03/local/opt/jboss-eap-6.2/mydomain/slave2/servers/rpa2/log/gc.log","-XX:+PrintGCDateStamps","-XX:+UseGCLogFileRotation","-XX:NumberOfGCLogFiles=5","-XX:GCLogFileSize=3M","-XX:-TraceClassUnloading","-XX:HeapDumpPath=/u03/local/opt/jboss-eap-6.2/mydomain/slave2/servers/rpa2/log","-XX:+HeapDumpOnOutOfMemoryError","-XX:+PrintGCDetails"])

Notice: We will have to bounce the application server for the properties to take effect.

Check JVM Settings in host.xml file

<servers>         <server name="rpa2" group="rpa-group" auto-start="true">             <jvm name="jvm-rpa">                 <heap size="64m" max-size="220m"/>                 <jvm-options>                     <option value="-verbose:gc"/>                     <option value="-Xloggc:/u03/local/opt/jboss-eap-6.2/mydomain/slave2/servers/rpa2/log/gc.log"/>                     <option value="-XX:+PrintGCDateStamps"/>                     <option value="-XX:+UseGCLogFileRotation"/>                     <option value="-XX:NumberOfGCLogFiles=5"/>                     <option value="-XX:GCLogFileSize=3M"/>                     <option value="-XX:-TraceClassUnloading"/>                     <option value="-XX:HeapDumpPath=/u03/local/opt/jboss-eap-6.2/mydomain/slave2/servers/rpa2/log"/>                     <option value="-XX:+HeapDumpOnOutOfMemoryError"/>                     <option value="-XX:+PrintGCDetails"/>                 </jvm-options>             </jvm>             <socket-bindings port-offset="150"/>         </server>

Check application server process, either these changes were effected or not. 

[jboss@middlewaretech log]$ ps -ef | grep -i rpa2

jboss    13888 13178  0 19:54 pts/1    00:00:20 /usr/java/jdk1.7.0_75/jre/bin/java -D[Server:rpa2] -Xms64m -Xmx220m -verbose:gc -Xloggc:/u03/local/opt/jboss-eap-6.2/mydomain/slave2/servers/rpa2/log/gc.log -XX:+PrintGCDateStamps -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=3M -XX:-TraceClassUnloading -XX:HeapDumpPath=/u03/local/opt/jboss-eap-6.2/mydomain/slave2/servers/rpa2/log -XX:+HeapDumpOnOutOfMemoryError -XX:+PrintGCDetails -D[Host Controller]=true -Djboss.domain.master.address=192.168.1.12 -Djava.awt.headless=true -Djboss.modules.system.pkgs=org.jboss.byteman -Djboss.home.dir=/u03/local/opt/jboss-eap-6.2 -Djava.net.preferIPv4Stack=true -Djboss.domain.base.dir=/u03/local/opt/jboss-eap-6.2/mydomain/slave2/ -Djboss.server.log.dir=/u03/local/opt/jboss-eap-6.2/mydomain/slave2/servers/rpa2/log -Djboss.server.temp.dir=/u03/local/opt/jboss-eap-6.2/mydomain/slave2/servers/rpa2/tmp -Djboss.server.data.dir=/u03/local/opt/jboss-eap-6.2/mydomain/slave2/servers/rpa2/data -Dlogging.configuration=file:/u03/local/opt/jboss-eap-6.2/mydomain/slave2/servers/rpa2/data/logging.properties -jar /u03/local/opt/jboss-eap-6.2/jboss-modules.jar -mp /u03/local/opt/jboss-eap-6.2/modules -jaxpmodule javax.xml.jaxp-provider org.jboss.as.server

The GC logs generating under  /u03/local/opt/jboss-eap-.2/mydomain/slave2/servers/rpa2/log/

The GC logs rotating as below. 

I hope this information is helpful to you......

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