Coding⏱️ 3 min read📅 2026-06-11

How to Fix: Perl error while compiling Munin transmission plugin

Perl error while compiling Munin transmission plugin on Ubuntu server 12.04

Quick Answer: Ensure the JSON/RPC/Client.pm module is installed and included in your Perl script's @INC path.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. ✅ Best Solutions to Fix It
  3. 🎯 Final Words

The error message indicates that the Perl script is unable to locate the JSON/RPC/Client.pm module, which is required for the Munin transmission plugin. This issue affects users who are trying to compile and install the plugin on their system.

This error can be frustrating as it prevents the user from successfully installing and configuring the plugin, leading to incomplete system monitoring capabilities.

🛑 Root Causes of the Error

  • The primary reason for this error is that the Perl module JSON/RPC/Client.pm is not installed or not properly configured on the system. This module is required by the Munin transmission plugin to function correctly.
  • Another possible cause is that the module is installed but not included in the system's PERL5LIB or PERLLIB environment variables, which are used by Perl to search for modules.

✅ Best Solutions to Fix It

Installing the JSON/RPC/Client.pm Module

  1. Step 1: Step 1: Update the package index to ensure that all available packages are listed. Run the following command in the terminal: `sudo apt-get update`.
  2. Step 2: Step 2: Install the required Perl module using the following command: `sudo cpan JSON::RPC::Client`.
  3. Step 3: Step 3: Verify that the module has been installed correctly by checking the output of the 'cpanm' command. If everything goes smoothly, you should see a message indicating that the package was successfully installed.

Configuring PERL5LIB or PERLLIB Environment Variables

  1. Step 1: Step 1: Open the system's configuration file for editing using your preferred text editor. Run the following command to locate the correct file: `sudo nano /etc/perl/5.14/lib/perl5/site_perl/JSON/RPC/Client.pm`.
  2. Step 2: Step 2: Check if the module is included in the PERL5LIB or PERLLIB environment variables by running the following command: `echo $PERL5LIB` and `echo $PERLLIB`. If the module is not listed, add its path to the end of the variable values.

🎯 Final Words

By following these steps, you should be able to resolve the Perl error and successfully compile and install the Munin transmission plugin on your Ubuntu server. Remember to restart the Munin service after making any changes to ensure that they take effect.

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