监控Tomcat状态！（重点）

方法一：开发JAVA监控页面

[root@localhost ~]# mkdir /usr/local/tomcat8/webapps/memtest/
[root@localhost ~]# cd /usr/local/tomcat8/webapps/
[root@localhost webapps]# ls
docs   examples   host-manager  jpress-web-newest  jpress-web-newest.war  manager  meminfo  meminfo.war memtest  ROOT
[root@localhost webapps]# cd memtest/
[root@localhost memtest]# cd
[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("JVM memory:"+tm+MB"+<br>");
out.println("JVM memory :"+fm+MB"+<br>");
out.println("Available memory can be used is :"+(mm+tm+fm)+"MB"+"<br>");
%>

方法二：使用jps命令进行监控

[root@localhost ~]# vim /etc/profile

在末尾添加如下两行

JAVA_HOME=/usr/local/java
PATH=$PATH:$JAVA_HOME/bin

[root@localhost ~]# jps -lvm
8353 org.apache.catalina.startup.Bootstrap start -Djava.util.logging.config.file=/usr/local/tomcat8/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=/usr/local/tomcat8 -Dcatalina.home=/usr/local/tomcat8 -Djava.io.tmpdir=/usr/local/tomcat8/temp
10123 sun.tools.jps.Jps -lvm -Dapplication.home=/usr/local/java -Xms8m

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 

在开头添加如下命令
#!/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=192.168.200.119"

[root@localhost ~]# /usr/local/tomcat8/bin/shutdown.sh 

[root@localhost ~]# /usr/local/tomcat8/bin/startup.sh 

[root@localhost ~]# netstat -lnpt

tcp6       0      0 :::12345                :::*                    LISTEN      10832/java