Zabbix JMX之tomcat监控

工作原理：

1、JAVA-GATEWAY

　　 Zabbix本身不支持直接监控Java，在zabbix 1.8以前，只能使用Zapcat来做代理监控，而且要修改源代码，非常麻烦。所有后来为了解决这个监控问题，Zabbix和Java双方应运生成了各自的代理监控程序：zabbix 2.0 以后添加了服务进程zabbix-java-gateway，用以在服务端接收JMX的监控数据；Java有了JMX（全称是Java Management Extensions,即Java管理扩展），用以在客户端收集客户端的监控数据并转发到zabbix-java-gateway

2、示意图

比如：当Zabbix-Server需要知道java应用程序的某项性能的时候，会启动自身的一个Zabbix-JavaPollers进程去连接Zabbix-Java-Gateway请求数据，而Zabbix-Java-gateway收到请求后会使用“JMX-management-API”去tomcat服务器开启JMX，而前提是tomcat服务器端在开启时需要“-Dcom.sun.management.jmxremote”参数来开启JMX远程查询。Java程序会启动自身的一个简单的小程序端口12345向Zabbix-JavaGateway提供请求数据。

Zabbix监控端部署：

1.安装zabbix server

编译安装zabbix server需要加上–enable-java以支持jmx监控，如果之前的zabbix server没加，那么请重新编译安装

./configure –prefix=/application/zabbix-3.0.3 –enable-server –enable-agent –enable-java –enable-ipv6 –with-mysql=/application/mysql-5.5.49/bin/mysql_config  –with-net-snmp –with-libcurl –with-libxml2 –with-openipmi –with-unixodbc –with-openssl

并且监控端也需要安装java环境

2.安装zabbix_java_gateway

wget http://mirrors.aliyun.com/zabbix/zabbix/3.4/rhel/6/x86_64/zabbix-java-gateway-3.4.1-1.el6.x86_64.rpm

rpm -ivh zabbix-java-gateway-3.4.1-1.el6.x86_64.rpm（zabbix-java-gateway用老版本可能会出错）

#zabbix_java_gateway配置文件zabbix_java_gateway.conf里有默认端口等设置，这里我们保持默认即可

service zabbix-java-gateway start

此时，默认的端口10052应该打开，ss -nat | grep 10052查看

在zabbix_server.conf 中配置监控端访问zabbix_java_gateway

JavaGateway=172.16.2.150  #zabbix_java_gateway地址

StartJavaPollers=6   #预启动进程轮询个数，且这个值要比zabbix_java_gateway.conf中Start_poller值要大，不然会无法通信

重启zabbix-server

zabbix客户端安装：

1.安装JMX

1. 下载 JMX Remote jar 二进制包。放在 tomcat/lib 下面

wget  http://archive.apache.org/dist/tomcat/tomcat-7/v7.0.56/bin/extras/catalina-jmx-remote.jar

2. 修改 tomcat conf/server.xml 配置文件，添加以下内容：

3. 修改 tomcat/bin 目录下 catalina.sh ，添加以下内容：

注意：Djava.rmi.server.hostname这里写上被监控端 hostname 是由于 hostname 默认值为 localhost,如果你的 tomcat 未监听在 localhost，那么不写具体 ip 会引发问题。并且这段配置应该写在catalina.sh的前面，不然端口打不开。

4. 确保 zabbix server 或者 proxy 和 配置文件中的端口通讯畅通，重启tomcat，lsof -i:12345端口打开

验证是否能获取数据

在监控端下载JMX cmd.jar文件

wget http://nchc.dl.sourceforge.net/project/jmxcmd/jmxcmd.jar

测试有数据则表示成功

命令格式：

# java -jar jmxcmd.jar – 192.168.3.18:12345 java.lang:type=Memory NonHeapMemoryUsage

导入模板，添加监控

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