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nagios3

Introduction​

This cheat sheet provides a quick reference for some common Nagios 3 commands and concepts. Nagios is a popular open-source monitoring system used to monitor the health and status of network services and hosts.

Nagios 3 Concepts​

Monitoring Configuration​

Nagios uses configuration files to define what services and hosts to monitor.

  • Edit the main configuration file:

    sudo nano /etc/nagios3/nagios.cfg

  • Define host and service configurations in the appropriate configuration files:

    sudo nano /etc/nagios3/conf.d/hosts.cfg
    sudo nano /etc/nagios3/conf.d/services.cfg

Configuration Validation​

You can check the validity of your Nagios configuration before restarting the service.

  • Validate the configuration files:
    sudo nagios3 -v /etc/nagios3/nagios.cfg

Starting and Stopping Nagios​

You can start and stop the Nagios service as needed.

  • Start the Nagios service:

    sudo service nagios3 start

  • Stop the Nagios service:

    sudo service nagios3 stop

Web Interface​

Access the Nagios web interface to view monitoring status and alerts.

  • Open the web interface in a browser:
    http://your_server_ip/nagios3

Monitoring Commands​

Nagios provides various commands to control monitoring checks.

  • Force a host check:

    sudo /usr/sbin/nagios3 -v /etc/nagios3/nagios.cfg

  • Schedule a host or service check:

    sudo /usr/sbin/nagios3 -s /etc/nagios3/nagios.cfg

Nagios 3 Command-Line​

  • Edit the main configuration file:

    sudo nano /etc/nagios3/nagios.cfg

  • Define host and service configurations in the appropriate configuration files:

    sudo nano /etc/nagios3/conf.d/hosts.cfg
    sudo nano /etc/nagios3/conf.d/services.cfg

  • Validate the configuration files:

    sudo nagios3 -v /etc/nagios3/nagios.cfg

  • Start the Nagios service:

    sudo service nagios3 start

  • Stop the Nagios service:

    sudo service nagios3 stop

  • Open the web interface in a browser:

    http://your_server_ip/nagios3

  • Force a host check:

    sudo /usr/sbin/nagios3 -v /etc/nagios3/nagios.cfg

  • Schedule a host or service check:

    sudo /usr/sbin/nagios3 -s /etc/nagios3/nagios.cfg

Conclusion​

This cheat sheet covers some common Nagios 3 commands and concepts. Nagios is a powerful monitoring system that helps you keep track of the health and status of your network services and hosts, making it invaluable for system administrators; refer to the official Nagios documentation for more in-depth information and advanced usage.