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Fixing Nagios3 Check Command Errors on Ubuntu

Ubuntu 4

In this article, we will delve into the process of resolving Nagios3 check command errors on Ubuntu. Nagios is a powerful IT management system that helps in network monitoring and infrastructure management. However, at times, you may encounter errors such as “(No output on stdout) stderr: execvp(/usr/local/nagios/libexec/check_ping)”. This usually indicates that the check_ping plugin is not found in the specified directory. This could be due to the plugins not being installed or being installed in a different location.

Quick Answer

To fix Nagios3 check command errors on Ubuntu, you need to install the nagios-plugins package, copy or create symbolic links to the plugins, and restart Nagios. This will ensure that the necessary plugins are installed and located in the correct directory, resolving the errors.

Prerequisites

Before we start, ensure that you have administrative access to your Ubuntu system and Nagios3 is already installed.

Installing Nagios-Plugins Package

The first step in resolving the issue is to install the nagios-plugins package. This package includes the necessary plugins required by Nagios to function correctly.

To install the package, open your terminal and run the following command:

sudo apt-get install nagios-plugins

In this command, sudo allows you to run the command with administrative privileges, apt-get is the package handling utility in Ubuntu, and install is used to install the specified package, which in this case is nagios-plugins.

Copying or Linking the Plugins

Once the installation is complete, you need to either copy all files starting with “check_” from the /usr/lib/nagios/plugins directory to the /usr/local/nagios/libexec directory or create symbolic links to the plugins.

To copy the plugins, use the following command:

sudo cp /usr/lib/nagios/plugins/check_* /usr/local/nagios/libexec

In this command, cp is used to copy files and directories, /usr/lib/nagios/plugins/check_* is the source directory, and /usr/local/nagios/libexec is the destination directory.

Alternatively, you can create symbolic links to the plugins with this command:

sudo ln -s /usr/lib/nagios/plugins/check_* /usr/local/nagios/libexec/

Here, ln -s is used to create symbolic links, and the source and destination directories are the same as in the previous command.

Restarting Nagios

After copying the plugins or creating the symbolic links, you need to restart Nagios for the changes to take effect. To do this, run the following command:

sudo service nagios3 restart

In this command, service is used to run a System V init script, nagios3 is the service that you want to manage, and restart is used to stop and then start the service.

Verifying the Fix

After restarting Nagios, refresh your browser window. If the steps were successful, the errors should be resolved.

Conclusion

If the above steps do not resolve the issue, it is possible that the plugins were not installed correctly or there may be other configuration issues. In such cases, it is recommended to refer to the official Nagios documentation for your specific platform and version to troubleshoot the problem further.

Resolving Nagios3 check command errors on Ubuntu can be a straightforward process if you follow the correct steps. By ensuring that the necessary plugins are installed and located in the correct directory, you can maintain the efficiency and functionality of your Nagios system.

What is Nagios3?

Nagios3 is a powerful IT management system that helps in network monitoring and infrastructure management. It allows users to monitor the health and performance of their entire IT infrastructure, including servers, switches, routers, and other network devices.

What causes the “(No output on stdout) stderr: execvp(/usr/local/nagios/libexec/check_ping)” error in Nagios3?

The "(No output on stdout) stderr: execvp(/usr/local/nagios/libexec/check_ping)" error usually occurs when the check_ping plugin is not found in the specified directory. This can happen if the plugins are not installed or if they are installed in a different location.

How can I install the nagios-plugins package?

To install the nagios-plugins package, open your terminal and run the command sudo apt-get install nagios-plugins. This will install the necessary plugins required by Nagios to function correctly.

How do I copy the plugins to the correct directory?

You can copy all files starting with "check_" from the /usr/lib/nagios/plugins directory to the /usr/local/nagios/libexec directory using the command sudo cp /usr/lib/nagios/plugins/check_* /usr/local/nagios/libexec.

Can I create symbolic links to the plugins instead of copying them?

Yes, you can create symbolic links to the plugins using the command sudo ln -s /usr/lib/nagios/plugins/check_* /usr/local/nagios/libexec/. This allows the plugins to be accessed from both the source and destination directories.

How do I restart Nagios after making changes?

To restart Nagios, run the command sudo service nagios3 restart. This will stop and then start the Nagios service, allowing the changes to take effect.

How can I verify if the fix was successful?

After restarting Nagios, refresh your browser window. If the steps were successful, the errors should be resolved, and you should no longer see the "(No output on stdout) stderr: execvp(/usr/local/nagios/libexec/check_ping)" error.

What should I do if the issue persists after following these steps?

If the issue persists after following these steps, it is possible that the plugins were not installed correctly or there may be other configuration issues. In such cases, it is recommended to refer to the official Nagios documentation for your specific platform and version to troubleshoot the problem further.

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