NagiOS - Monitor Tomcat Using check_tomcat.pl Plugin - CentOS 7

Step 1:

Login NagiOS Server & Install Dependency Package

yum install perl-XML-XPath perl-libwww-perl

Step 2:

Download check_tomcat.pl

A: Using WebBrowser

https://exchange.nagios.org/directory/Plugins/Java-Applications-and-Servers/Apache-Tomcat/check_tomcat-2Epl/details

B: Using curl

cd /usr/local/nagios/libexec

curl "https://exchange.nagios.org/components/com_mtree/attachment.php?link_id=2522&cf_id=24" -o check_tomcat.pl

chmod +x /usr/lib/nagios/plugins/check_tomcat.pl

Step 3:

Test check_tomcat.pl

cd /usr/local/nagios/libexec

./check_tomcat.pl -h

./check_tomcat.pl -I 172.17.20.103 -p 8080 -l admin -a admin -w 20%,30% -c 10%,20%

Step 4:

Add Command for Check Tomcat

vi /etc/nagios/objects/commands.cfg

#Check tomcat service

define command{

command_name    check_tomcat

command_line   /bin/sh -c  “$USER1$/check_tomcat.pl -H $HOSTADDRESS$ -p $ARG1$ -l $ARG2$ -a $ARG3$ -w $ARG4$ -c $ARG5$”

}

Note: we can use the command_line variable as below. But sometimes you will get an error. So we can use “/bin/sh -c ” to avoid the error

Step 5:

Add Service in Client.cfg

 define service{

use                           generic-service         ; Inherit default values from a template

host_name               test-red1

service_description  Tomcat

check_command      check_tomcat!8080!admin!admin!10%,50%!5%,10%

}

Step 6:

check Nagios configurations and restart

/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

Total Warnings: 0

Total Errors:   0

Things look okay – No serious problems were detected

systemctl restart nagios

Step 7:

check Nagios service monitoring page for tomcat status in Browser

         http://172.17.20.100/nagios/

Part 1: Nagios Core 4.X configuration in Linux

Part 2: Add Remote hosts and service in Nagios

Part 3: Monitor MySQL/MariaDB Using check_mysql Plugin

Part 4: Monitor Tomcat using check_tomcat Plugin