`zabbix-java-gateway` on Centos 6.5

Installing zabbix-java-gateway on Centos 6.5

How does zabbix-java-gateway work?

1. First we configure system which needs to be monitored using the JAVA_OPTS.
2. Next we add a JMX Interface in Zabbix server UI under hosts.
3. zabbix-server will communicate with zabbix-java-gateway which intern communicates to the system/server where we need to get all the JMX data.
4. JMX is set using the JAVA_OPTS.

 [Zabbix-Server] --(port:10053)--> [zabbix-java-gateway] --(port:12345)--> [JMX enabled server, Example:Tomcat/WebServer]

Step 1 : Install zabbix-java-gateway on zabbix-server

 [ahmed@ahmed-server ~]$ sudo yum install zabbix-java-gateway

Step 2 : Configure the host with JMX which needs to be monitored.

Setting Tomcat/JMX Options. Add the below lines to setenv.sh and save it under apache-tomcat-7/bin/
So when the start.sh is started then these JMX options will be added to tomcat server.

NOTE: To make the monitoring secure use ssl and authentication options. You can find more information in the links at the end of this post.

IMPORTANT Lines are below. We will be getting data from port 12345.

  -Dcom.sun.management.jmxremote\
  -Dcom.sun.management.jmxremote.port=12345\
  -Dcom.sun.management.jmxremote.authenticate=false\
  -Dcom.sun.management.jmxremote.ssl=false"

But here are the complete JAVA_OPTS. you can ignore the first few lines which sets the Heap Memory size.

 export JAVA_OPTS="$JAVA_OPTS\
  -server\
  -Xms1024m\
  -Xmx2048m\
  -XX:MaxPermSize=256m\
  -XX:MaxNewSize=256m\
  -XX:NewSize=256m\
  -XX:SurvivorRatio=12\
  -Dcom.sun.management.jmxremote\
  -Dcom.sun.management.jmxremote.port=12345\
  -Dcom.sun.management.jmxremote.authenticate=false\
  -Dcom.sun.management.jmxremote.ssl=false"

Step 3 : Configuring zabbix-server.

1. Here we configure the zabbix server to let it know where the zabbix-java-gateway is running.
2. Since we are running the zabbix-java-gateway in the same server as zabbix-server, so we will be using the same ip for both.
3. Only difference is that zabbix-java-gateway will be running on port 10053

Configuration in zabbix-server.conf. Add the below line. Rather un-comment them and add the IP/ports

 ### Option: JavaGateway
 #       IP address (or hostname) of Zabbix Java gateway.
 #       Only required if Java pollers are started.
 #
 # Mandatory: no
 # Default:
 JavaGateway=10.10.18.27

 ### Option: JavaGatewayPort
 #       Port that Zabbix Java gateway listens on.
 #
 # Mandatory: no
 # Range: 1024-32767
 # Default:
 JavaGatewayPort=10053

 ### Option: StartJavaPollers
 #       Number of pre-forked instances of Java pollers.
 #
 # Mandatory: no
 # Range: 0-1000
 # Default:
 StartJavaPollers=5

Step 4 : Configuring zabbix-java-gateway.

1. We now set where the zabbix-java-gateway will be running and which port it will be listing on.
2. Configuration in zabbix-java-gateway, here same ip as the zabbix-server and port 10053.

 ### Option: zabbix.listenIP
 #       IP address to listen on.
 #
 # Mandatory: no
 # Default:
 LISTEN_IP="10.10.18.27"

 ### Option: zabbix.listenPort
 #       Port to listen on.
 #
 # Mandatory: no
 # Range: 1024-32767
 # Default:
 LISTEN_PORT=10053

 ### Option: zabbix.pidFile
 #       Name of PID file.
 #       If omitted, Zabbix Java Gateway is started as a console application.
 #
 # Mandatory: no
 # Default:
 # PID_FILE=

 PID_FILE="/var/run/zabbix/zabbix_java.pid"

 ### Option: zabbix.startPollers
 #       Number of worker threads to start.
 #
 # Mandatory: no
 # Range: 1-1000
 # Default:
 START_POLLERS=5

Useful Links:

 https://www.zabbix.com/documentation/2.4/manual/concepts/java
 https://www.zabbix.com/documentation/2.4/manual/config/items/itemtypes/jmx_monitoring

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