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jolokia + jmx4perl による apache tomcat8の監視

tomcat default の http://$TOMCAT_HOST/manager/status/all?XML=true

https://tomcat.apache.org/tomcat-8.0-doc/manager-howto.html#Server_Status
上記urlに記載されている通り、tomcatデフォルトでも 基本ステータスは取得でき、例えば、私の環境では、次のように表示されます。
http://cent62.a5.jp:8080/manager/status/all?XML=true

Tomcat Status
JVM:	free:24493640	total:74842112	max:476446720
Memory Pools
Name:Eden Space	Type:Heap memory	Initial:8388608	Committed:20709376	Maximum:131465216	Used:18697992
Name:Survivor Space	Type:Heap memory	Initial:1048576	Committed:2555904	Maximum:16384000	Used:379760
Name:Tenured Gen	Type:Heap memory	Initial:20971520	Committed:51576832	Maximum:328597504	Used:31270720
Name:Code Cache	Type:Non-heap memory	Initial:2555904	Committed:10158080	Maximum:251658240	Used:10010752
Name:Compressed Class Space	Type:Non-heap memory	Initial:0	Committed:2490368	Maximum:1073741824	Used:2265328
Name:Metaspace	Type:Non-heap memory	Initial:0	Committed:21364736	Maximum:-1	Used:20614728
Connector -- "ajp-nio-8009"
threadInfo	maxThreads:200	currentThreadCount:0	currentThreadsBusy:0
requestInfo	maxTime:0	processingTime:0	requestCount:0	errorCount:0	bytesReceived:0	bytesSent:0
Stage	Time	B Sent	B Recv	Client	VHost	Request
Connector -- "http-nio-8080"
threadInfo	maxThreads:200	currentThreadCount:25	currentThreadsBusy:1
requestInfo	maxTime:12492	processingTime:1540034	requestCount:491	errorCount:355	bytesReceived:1921	bytesSent:2487646
Stage	Time	B Sent	B Recv	Client	VHost	Request
R	0	0	0	?	?	?????
:	:	:	:	:	:	:
S	12	8192	0	192.168.56.1	cent62.a5.jp	GET/manager/status/all?XML=trueHTTP/1.1
:	:	:	:	:	:	:

Jolokia is remote JMX with JSON over HTTP.

https://jolokia.org/
今回、利用する Jolokia は、jsonJMX(Java Management Extensions, MBean)にアクセスするもので、以降の手順で利用できます。

STEP1 JMX設定

step 1.1 server.xml の編集

$ vi /home/endo/local/tomcat8/conf/server.xml
  :
<Server port="8005" shutdown="SHUTDOWN">
     :
  <Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener" />
  <Listener className="org.apache.catalina.mbeans.JmxRemoteLifecycleListener"
            rmiRegistryPortPlatform="10080" rmiServerPortPlatform="10081"/>
step 1.2 catalina-jmx-remote.jar の入手
$ /home/endo/local/apache-tomcat-8.0.21/lib/
$ wget http://archive.apache.org/dist/tomcat/tomcat-8/v8.0.21/bin/extras/catalina-jmx-remote.jar
step 1.3 startup.sh の編集

次のCATALINA_OPTS を追加して下さい

$ vi /home/endo/local/tomcat8/bin/startup.sh
export CATALINA_OPTS="-Dcom.sun.management.jmxremote=true
                      -Dcom.sun.management.jmxremote.port=10080
                      -Dcom.sun.management.jmxremote.ssl=false
                      -Dcom.sun.management.jmxremote.authenticate=false
                      -Djava.rmi.server.hostname=cent62.a5.jp"

STEP2 jolokia の入手と動作確認

jolokia自体はwarで提供されている為、warを入手するだけで完了です。
https://jolokia.org/

cd /home/endo/local/tomcat8/webapps
wget http://search.maven.org/remotecontent?filepath=org/jolokia/jolokia-war/1.2.3/jolokia-war-1.2.3.war
mv jolokia-war-1.2.3.war jolokia.war

上記完了後、tomcatを再起動し、http://cent62.a5.jp:8080/jolokia へアクセスし、次のようなjsonが表示されれば、OKです。

{"request":{"type":"version"},
 "value":{"agent":"1.2.3",
          "protocol":"7.2",
          "config":{"maxCollectionSize":"1000",
                    "agentId":"192.168.56.102-30197-51428d6f-servlet",
                    "debug":"false",
                    "agentType":"servlet",
                    "serializeException":"false",
                    "detectorOptions":"{}",
                    "dispatcherClasses":"org.jolokia.jsr160.Jsr160RequestDispatcher",
                    "maxDepth":"15",
                    "discoveryEnabled":"false",
                    "canonicalNaming":"true",
                    "historyMaxEntries":"10",
                    "includeStackTrace":"true",
                    "maxObjects":"0",
                    "debugMaxEntries":"100"},
          "info":{"product":"tomcat",
                  "vendor":"Apache",
                  "version":"8.0.21"}},
 "timestamp":1430690476,"status":200}

STEP3 Jmx4Perl のinstall

http://search.cpan.org/dist/jmx4perl/
https://jolokia.org/tutorial.html
更に JMX::Jmx4Perl を使用すると、jolokia経由でJMXにアクセスできます。

# cpan install jmx4perl

JMX::Jmx4Perl をinstallすると、jmx4perl が合せてinstallされるので、これを実行すると、次のような結果をえることができます。

$ jmx4perl http://cent62.a5.jp:8080/jolokia
Name:      Apache Tomcat
Vendor:    Apache
Version:   8.0.21
--------------------------------------------------------------------------------
Memory:
   Heap-Memory used    : 35 MB
   Heap-Memory alloc   : 41 MB
   Heap-Memory max     : 454 MB
   NonHeap-Memory max  : 0 MB
Classes:
   Classes loaded      : 3278
   Classes total       : 3287
Threads:
   Threads current     : 27
   Threads peak        : 27
OS:
   CPU Arch            : amd64
   CPU OS              : Linux 2.6.32-504.el6.x86_64
   Memory total        : 769 MB
   Memory free         : 769 MB
   Swap total          : 815 MB
   Swap free           : 811 MB
   FileDesc Open       : 77
   FileDesc Max        : 4096
Runtime:
   Name                : 30197@cent62.a5.jp
   JVM                 : 25.45-b02 Java HotSpot(TM) 64-Bit Server VM Oracle Corporation
   Uptime              : 2 h, 4 m, 51 s
   Starttime           : Mon May  4 06:59:59 2015