Nagstamon

Nagstamon is a Nagios status monitor for the desktop. It connects to multiple monitoring servers such as Nagios, Icinga, Opsview, Centreon, Op5 Monitor/Ninja and Check_MK Multisite. It resides in the system tray or as a floating status bar, displaying a summary of hosts and services in a critical, warning, unknown, unreachable or down state. Hovering the mouse over it reveals a detailed status overview. Connection to the displayed hosts and services is established from the context menu via SSH, RDP and VNC. Users can receive sound notifications. Hosts and services can be filtered by category and regular expressions.

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• Multi-server monitoring. Nagstamon allows simultaneous connection to multiple instances of different monitoring systems from a single application. It supports Nagios, Icinga, Opsview, Centreon, Op5 Monitor/Ninja, Check_MK Multisite and Thruk servers. Each server is configured independently with its credentials and access parameters, consolidating all status information into a single display point.
• Compact visual indicator. The main interface is a floating indicator or a system tray icon. This element displays a summarized count of problems grouped by severity. The minimalist design occupies minimal space on the desktop, providing an immediate view of the overall status of all monitored systems without interfering with other tasks.
• Detailed hover view. Hovering the cursor over the Nagstamon indicator reveals a pop-up window with specific information. This window lists all hosts and services with problems, organized by monitoring server and status. It shows host names, service descriptions, error messages, and the duration of the current state.
• Direct connection from context. The application's context menu allows initiating direct connections to problematic hosts. It supports protocols such as SSH, RDP, VNC and Telnet. Configuration defines the commands or clients to use for each connection type, enabling quick access for diagnostic tasks and incident resolution.
• Notification system. Nagstamon includes a configurable event-based notification engine. It generates pop-up visual alerts and customizable sounds when new problems or state changes are detected. Notifications can be configured granularly by state type, reducing alert fatigue in environments with many monitored items.
• Advanced element filtering. The tool offers filtering capabilities to control which problems are displayed. Filters are applied by state type, such as critical, warning or unknown. Regular expressions are also supported to include or exclude specific hosts and services by name, allowing the view to be tailored to the operator's responsibilities.
• Appearance customization. The text and background colors of the floating indicator are configurable. This customization allows adjusting the contrast according to the desktop's color scheme or for better legibility. It is also possible to define specific colors for each state type, facilitating quick identification of problem severity.
• Portable and installation-free mode. The software runs without an installation process on the system. Configuration files and data are stored in the same directory as the executable. This feature enables its use from USB drives, allowing administrators to carry their customized monitoring environment to different physical locations.
• Authentication support. It manages access credentials for each configured monitoring server. It supports common authentication methods, including HTTP basic authentication and certificate-based authentication. Passwords can be stored encrypted in the local configuration file for enhanced security.
• Real-time updates. The status of monitored servers is updated periodically via HTTP/HTTPS requests. The update interval is configurable per server, balancing network load and the need for up-to-date information. Status changes detected between updates immediately trigger configured notifications.
• Problem acknowledgment logic. It implements logic to distinguish between "soft" and "hard" states of monitoring checks. This distinction is crucial in Nagios/Icinga environments, where checks must fail multiple consecutive times before declaring a definitive problem state, reducing notifications for transient failures.
• Activity log. It maintains an internal log of events, such as status changes, server connections and communication errors. This log is useful for diagnosing issues within the tool itself or for auditing actions taken during incident response in the monitored infrastructure.

Development of Nagstamon began in the year 2006. The creator and lead developer is Henri Wahl. The project arose from the need to have a consolidated view of the status of multiple Nagios servers without relying on the web interface, accessible directly from the desktop. The program is primarily written in the Python programming language, facilitating its execution on multiple platforms. Throughout its history, the application has incorporated support for a growing number of monitoring systems, extending its usefulness beyond the original Nagios ecosystem.

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