Building the jmx4perl plugin

We use the Perl CPAN (Comprehensive Perl Archive Network) shell here to download missing dependencies.

Before you begin

The main commands and scripts in this section (cpan, Build.PL, the Build perl script) need to be run with root permissions, for example, as root or using sudo.

Procedure

Extract the jmx4perl distribution:

$ cd /usr/local/src

# tar zxvf /tmp/jmx4perl-1.05.tar.gz

# ln -s -f jmx4perl-1.05 jmx4perl

Install the build module:

# cpan

cpan[1]> install Module::Build

cpan[1]> exit

This step installs missing dependencies for jmx4perl. There are two ways of doing this:
- A Build perl script is created later in this section; if you have a Build script that was previously created (for example, during an similar installation on another machine), then it's quicker to use it here:
```
# cd /usr/local/src/jmx4perl
# ./Build installdeps
```
- If you do not have a previously-created Build script, then explicitly install jmx4perl dependencies (and accept the default values to any questions):
```
# cpan
```
```
cpan[1]> install Config::General
```
```
cpan[2]> install Crypt::Blowfish_PP
```
```
cpan[3]> install File::SearchPath
```
```
cpan[4]> install JSON
```
```
cpan[5]> install Module::Find
```
```
cpan[6]> install Nagios::Plugin
```
```
cpan[7]> install Term::Clui
```
```
cpan[8]> install Term::ReadKey
```
```
cpan[9]> install Term::ReadLine::Perl
```
```
cpan[10]> install Term::ShellUI
```
```
cpan[11]> install Term::Size
```
```
cpan[12]> exit
```
Run the newly-created Build.PL script, which generates the ./Build perl script:
```
# cd /usr/local/src/jmx4perl
```
```
# perl Build.PL
```
Information noteNote: Choose 'n' in response to "Install 'jolokia'" in the following script. Jolokia is not required directly on the Nagios server host, and only needs to be installed within the monitored containers (Talend containers have it pre-installed). Adding Jolokia would require installing additional modules and has not been tested.

When running this script give the following answers:
```
Install 'jmx4perl' ? (y/n) [y ]y
Install 'check_jmx4perl' ? (y/n) [y ]y
Install 'cacti_jmx4perl' ? (y/n) [y ]y
Install 'j4psh' ? (y/n) [y ]y
Install Term::ReadLine::Gnu ? (y/n) [n ]n
Install 'jolokia' ? (y/n) [y ]n 
```
* see note above

Run the ./Build script to recheck all dependencies are installed:
```
# ./Build installdeps
```
Run the Build comand:
```
# ./Build install
```

What to do next

When all these steps finished successfully, the jmx4perl plugin should be installed onto Nagios.

Check everything has been correctly installed by communicating with a Talend Runtime Container (this already has an active Jolokia agent) (please replace <jolokia_host> with the host where the Talend Runtime Container is running):

$ check_jmx4perl -u http://<jolokia_host>:8040/jolokia --alias 
			MEMORY_HEAP_USED --base MEMORY_HEAP_MAX --warning 80 --critical 90

If you have problems getting this running, try disabling the firewall on the Jolokia (Talend Runtime Container) host.

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