目錄

• 1.監(jiān)控Tomcat的方式
• 2.Java自帶的監(jiān)控命令
• 3.Tomcat故障案例
• 4.配置Tomcat JMX監(jiān)控
• 5.使用Jsconsole連接JMX查看監(jiān)控數(shù)據(jù)

通過JConsoler監(jiān)控Tomcat的JVM內(nèi)存

1.監(jiān)控Tomcat的方式

• 簡單命令
• 現(xiàn)成腳本
• 通過zabbix自定義監(jiān)控

自定義監(jiān)控 只要是用命令能得到的東西都能去監(jiān)控

通過jmx 對java進(jìn)行監(jiān)控

• 其他監(jiān)控

通過ipmi 監(jiān)控硬件的

通過snmp 監(jiān)控網(wǎng)絡(luò)設(shè)備的，只要支持snmp都能監(jiān)控

2.Java自帶的監(jiān)控命令

• jps 導(dǎo)出java相關(guān)的進(jìn)程
• 格式：jps -lvm
• 參數(shù)選項：-lvm最詳細(xì)

[root@localhost ~]# jps -lvm7457 org.apache.catalina.startup.Bootstrap start start -Djava.util.logging.config.file=/application/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -Dcatalina.base=/application/tomcat -Dcatalina.home=/application/tomcat -Djava.io.tmpdir=/application/tomcat/temp7525 org.apache.catalina.startup.Bootstrap start start -Djava.util.logging.config.file=/application/tomcat_8082/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -Dcatalina.base=/application/tomcat_8082 -Dcatalina.home=/application/tomcat_8082 -Djava.io.tmpdir=/application/tomcat_8082/temp9144 sun.tools.jps.Jps -lvm -Denv.class.path=.:/application/jdk/lib:/application/jdk/jre/lib:/application/jdk/lib/tools.jar -Dapplication.home=/application/jdk1.8.0_60 -Xms8m7482 org.apache.catalina.startup.Bootstrap start start -Djava.util.logging.config.file=/application/tomcat_8081/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -Dcatalina.base=/application/tomcat_8081 -Dcatalina.home=/application/tomcat_8081 -Djava.io.tmpdir=/application/tomcat_8081/temp

• jmap 導(dǎo)出jvm信息，常用于自定義監(jiān)控
• 格式：jmap pid
• 參數(shù)：-heap

[root@localhost ~]# jmap -heap 7457Attaching to process ID 7457, please wait...Debugger attached successfully.Server compiler detected.JVM version is 25.60-b23using thread-local object allocation.Mark Sweep Compact GCHeap Configuration:   MinHeapFreeRatio = 40   MaxHeapFreeRatio = 70   MaxHeapSize      = 255852544 (244.0MB)   NewSize  = 5570560 (5.3125MB)   MaxNewSize       = 85262336 (81.3125MB)   OldSize  = 11206656 (10.6875MB)   NewRatio = 2   SurvivorRatio    = 8   MetaspaceSize    = 21807104 (20.796875MB)   CompressedClassSpaceSize = 1073741824 (1024.0MB)   MaxMetaspaceSize = 17592186044415 MB   G1HeapRegionSize = 0 (0.0MB)Heap Usage:			#監(jiān)控的話關(guān)注這一列New Generation (Eden + 1 Survivor Space):   capacity = 12779520 (12.1875MB)   used     = 11689352 (11.147834777832031MB)   free     = 1090168 (1.0396652221679688MB)   91.46941356169872% usedEden Space:				#監(jiān)控的話關(guān)注這一列   capacity = 11403264 (10.875MB)   used     = 11059616 (10.547271728515625MB)   free     = 343648 (0.327728271484375MB)   96.98640669899426% usedFrom Space:					#監(jiān)控的話關(guān)注這一列   capacity = 1376256 (1.3125MB)   used     = 629736 (0.6005630493164062MB)   free     = 746520 (0.7119369506835938MB)   45.75718470982143% usedTo Space:				#監(jiān)控的話關(guān)注這一列   capacity = 1376256 (1.3125MB)   used     = 0 (0.0MB)   free     = 1376256 (1.3125MB)   0.0% usedtenured generation:				#監(jiān)控的話關(guān)注這一列   capacity = 28164096 (26.859375MB)   used     = 18313224 (17.46485137939453MB)   free     = 9850872 (9.394523620605469MB)   65.02329774760035% used21146 interned Strings occupying 1882520 bytes.

• jstatck 導(dǎo)出java的進(jìn)程信息，常用于java程序故障，需要導(dǎo)出線程信息與開發(fā)一起研究
• 格式：jstack -l pid

[root@localhost ~]#? jstack -l 7457

3.Tomcat故障案例

系統(tǒng)負(fù)載高，tomcat占用CPU較高

• 1.jps/top/htop精確確定哪個java進(jìn)程導(dǎo)致
• 2.jstack導(dǎo)出java線程
• 3.catalina.out日志分析
• 4.jmap導(dǎo)出jvm信息，可以通過mat工具進(jìn)行分析

4.配置Tomcat JMX監(jiān)控

• 自定義監(jiān)控：直接在tomcat服務(wù)器上寫好腳本，在zabbix配置文件寫好就行
• 首先需要在zabiix服務(wù)端安裝zabbix-java-gateway然后在tomcat服務(wù)器開啟監(jiān)控功能
• tomcat開啟jmx監(jiān)控功能

#修改bin/catalina.sh[root@localhost tomcat]# vim bin/catalina.sh#注意不能分行寫會報錯找不到命令，要寫在一行上CATALINA_OPTS="$CATALINA_OPTS"-Dcom.sun.management.jmxremote-Dcom.sun.management.jmxremote.port=12345-Dcom.sun.management.jmxremote.authenticate=false-Dcom.sun.management.jxmremote.ssl=false-Djava.rmi.server.hostname="192.168.81.210"#正確寫法CATALINA_OPTS="$CATALINA_OPTS -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=12345 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jxmremote.ssl=false -Djava.rmi.server.hostname=192.168.81.210"#說明CATALINA_OPTS="$CATALINA_OPTS"		#修改tomcat啟動參數(shù)-Dcom.sun.management.jmxremote		#開啟tomcat遠(yuǎn)程管理功能-Dcom.sun.management.jmxremote.port=12345	#遠(yuǎn)程管理功能，除了12345端口，還會生成2個隨機(jī)端口，我們可以開放所有端口Dcom.sun.management.jmxremote.authenticat=false			#是否在監(jiān)控時需要認(rèn)證-Dcom.sun.management.jmxremote.ssl=false	#是否開啟ssl連接-Djava.rmi.server.hostname="192.168.81.210"		#設(shè)置tomcat所在服務(wù)器的ip配置完成后重啟tomcat即可使用ps命令可以看到輸出的信息多了我們寫入的幾行[root@localhost tomcat]# ps aux | grep javaroot      17786  5.7 10.6 2306592 105860 pts/1  Sl   15:52   0:08 /application/jdk/bin/java-Djava.util.logging.config.file=/application/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources-Dorg.apache.catalina.security.SecurityListener.UMASK=0027-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=12345-Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jxmremote.ssl=false -Djava.rmi.server.hostname=192.168.81.210 -Dignore.endorsed.dirs= -classpath /application/tomcat/bin/bootstrap.jar:/application/tomcat/bin/tomcat-juli.jar -Dcatalina.base=/application/tomcat -Dcatalina.home=/application/tomcat -Djava.io.tmpdir=/application/tomcat/temp org.apache.catalina.startup.Bootstrap start使用ss/netstat 命令可以看到多出啦的三個端口[root@localhost tomcat]# ss -lnptu | grep javatcp    LISTEN     0      100      :::8080 :::*   users:(("java",pid=17786,fd=56))#我們制定的tcp    LISTEN     0      50       :::12345:::*   users:(("java",pid=17786,fd=22))#隨機(jī)的1tcp    LISTEN     0      50       :::46272:::*   users:(("java",pid=17786,fd=21))#隨機(jī)的2tcp    LISTEN     0      50       :::46081:::*   users:(("java",pid=17786,fd=24))tcp    LISTEN     0      1      ::ffff:127.0.0.1:8005 :::*   users:(("java",pid=17786,fd=65))

5.使用Jsconsole連接JMX查看監(jiān)控數(shù)據(jù)

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