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Monit vs Nagios: What are the differences?

Key Differences between Monit and Nagios

Monit and Nagios are two popular monitoring systems that help administrators track and manage their infrastructure. While they serve similar purposes, there are significant differences between the two.

  1. Architecture: Monit is designed as a lightweight and standalone tool, focusing on local system monitoring. It has a simple client/server architecture, with each monitored system running its own instance of Monit. On the other hand, Nagios follows a distributed architecture with a central server monitoring multiple remote systems using dedicated agents or plug-ins.

  2. Alerting and Notification: Monit provides basic alerting and notification capabilities. It can send email alerts or trigger specific actions based on predefined rules. In contrast, Nagios offers more sophisticated alerting features, including SMS, phone calls, and integration with various third-party notification services.

  3. Flexibility and Customization: Monit is highly configurable and allows administrators to define custom monitoring rules using its domain-specific language. It provides flexibility for monitoring various system parameters. Nagios, on the other hand, specializes in monitoring network devices and services but requires significant customization for monitoring other aspects of the system.

  4. Ease of Use: Monit emphasizes simplicity and ease of use. Its configuration is relatively straightforward, and it has an intuitive web interface for monitoring and managing systems. Nagios, being more comprehensive, has a steeper learning curve. It requires more effort to set up, configure, and maintain, making it more suitable for complex infrastructures.

  5. Community and Ecosystem: Nagios has a vibrant community and a wide range of community-developed plugins available, allowing monitoring of different systems and devices. Monit, although popular, has a smaller community and a more limited selection of plugins. This impacts the extensibility and coverage of monitoring capabilities.

  6. Enterprise Features: Nagios offers various advanced features suitable for enterprise environments, such as distributed monitoring, performance metrics, and advanced reporting. Monit, being lightweight and focused on simplicity, lacks these extensive enterprise-level features.

In summary, Monit is a lightweight and easy-to-use monitoring tool with a simpler architecture, basic alerting capabilities, and customizability. Nagios, on the other hand, provides more advanced functionality, scalability, and enterprise-level features, but requires more effort to set up and maintain.

Decisions about Monit and Nagios
Matthias Fleschütz
Teamlead IT at NanoTemper Technologies · | 2 upvotes · 122.7K views
  • free open source
  • modern interface and architecture
  • large community
  • extendable I knew Nagios for decades but it was really outdated (by its architecture) at some point. That's why Icinga started first as a fork, not with Icinga2 it is completely built from scratch but backward-compatible with Nagios plugins. Now it has reached a state with which I am confident.
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Pros of Monit
Pros of Nagios
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    • 53
      It just works
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      The standard
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      Customizable
    • 8
      The Most flexible monitoring system
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      Huge stack of free checks/plugins to choose from

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    - No public GitHub repository available -

    What is Monit?

    It can monitor and manage distributed computer systems, conduct automatic maintenance and repair and execute meaningful causal actions in error situations.

    What is Nagios?

    Nagios is a host/service/network monitoring program written in C and released under the GNU General Public License.

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