方法一：开发 java 监控页面
[root@localhost ~]# mkdir /usr/local/tomcat8/webapps/memtest/ [root@localhost ~]# vim /usr/local/tomcat8/webapps/memtest/meminfo.jsp <% Runtime rtm = Runtime.getRuntime(); long mm = rtm.maxMemory()/1024/1024; long tm = rtm.totalMemory()/1024/1024; long fm = rtm.freeMemory()/1024/1024; out.println("JVM memory detail info :<br>"); out.println("Max memory:"+mm+"MB"+"<br>"); out.println("Total memory:"+tm+"MB"+"<br>"); out.println("Free memory:"+fm+"MB"+"<br>"); out.println("Available memory can be used is :"+(mm+fm-tm)+"MB"+"<br>"); %>
方法二：使用 jps 命令监控
[root@localhost ~]# jps -lvm 80106 sun.tools.jps.Jps -lvm -Dapplication.home=/usr/local/java -Xms8m 79788 org.apache.catalina.startup.Bootstrap start -Djava.util.logging.config.file=/usr/local/tomcat8/conf/logging.propertie s -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dcatalina.base=/usr/local/tomcat8 -Dcatalina.home=/usr/local/tomcat8 -Djava.io.tmpdir=/usr/local/tomcat8/temp
方法三：Tomcat 远程监控功能
修改配置文件，开启远程监控
[root@localhost ~]# vim /usr/local/tomcat8/bin/catalina.sh #!/bin/sh CATALINA_OPTS="$CATALINA_OPTS -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=12345 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Djava.rmi.server.hostname=192.168.200.112" [root@localhost ~]# /usr/local/tomcat8/bin/shutdown.sh [root@localhost ~]# /usr/local/tomcat8/bin/startup.sh [root@localhost ~]# netstat -lnpt | grep 12345 tcp6 0 0 :::12345 :::* LISTEN 80262/java
