监控Tomcat状态

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