computer science

Naemon

Naemon is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Naemon rather than just read about it. In short: Naemon is an open-source network monitoring and infrastructure monitoring application. It monitors hosts, network services, and system resources, and sends notifications when problems are detected or resolved.

Key takeaways

Naemon belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Naemon to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Naemon from memory before moving on to harder problems.

Reference excerpt

Naemon is an open-source network monitoring and infrastructure monitoring application. It monitors hosts, network services, and system resources, and sends notifications when problems are detected or resolved. Naemon was created in 2014 as a fork of Nagios 4, after several Nagios contributors decided to continue development outside the Nagios project. It is one of several monitoring tools in the Nagios ecosystem, alongside Icinga and Checkmk. The open-source monitoring framework openITCOCKPIT uses Naemon as its monitoring core. It runs on Linux and is available in packages for Red Hat Enterprise Linux, CentOS, SUSE Linux Enterprise Server, Debian, and Ubuntu.

History Naemon originated from dissatisfaction with the direction of the Nagios project following the Nagios 4 release cycle. In late 2013, Andreas Ericsson and other contributors announced the fork at the Open Source Monitoring Conference, citing a desire to continue work that had begun in Nagios 4 and to develop outside what they described as an unwelcoming community environment. Ericsson, who had written the bulk of the Nagios 4 codebase, described Naemon's priorities as stability, performance, and extensibility. The first release, based on Nagios 4.0.2, appeared on January 29, 2014. Naemon 1.4.0 was released in November 2022, and version 1.4.2 followed in January 2024. Naemon is one of several forks that emerged from the Nagios project during the early 2010s, alongside Icinga (forked 2009) and Shinken (forked 2011).

Architecture Naemon is written in C and is licensed under version 2 of the GNU General Public License. Its design follows the plugin-based architecture established by Nagios, in which the core daemon schedules and dispatches checks, while external plugins perform the actual tests and return results. The core daemon monitors network services including SMTP, POP3, and HTTP, as well as host resources such as processor load and disk usage. Checks are dispatched in parallel, which reduces total check latency on large installations. Naemon supports a parent-host hierarchy that allows it to distinguish between hosts that are down and hosts that are unreachable due to an intermediate failure. When a service or host changes state, Naemon dispatches notifications via configurable methods: email, pager, or any user-defined method implemented as a plugin. Event handlers can be configured to run automatically when state changes occur, enabling automated remediation. Log files are rotated automatically, and the daemon can be deployed in redundant configurations to reduce single points of failure. The web interface most commonly paired with Naemon is Thruk, a separate open-source project that provides a browser-based dashboard for viewing host and service status, history, and reports.

See also Comparison of network monitoring systems Nagios – the upstream project from which Naemon was forked Icinga – another fork of Nagios Checkmk – a related network monitoring system Shinken (software) – another Nagios fork

References

External links Official website

Illustrations

Worked examples

Example 1 — a first encounter with Naemon

Start with the simplest possible case. Write down what Naemon claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Naemon before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Naemon ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Naemon

In research: Naemon appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Naemon in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Naemon is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2014 software, Free network management software, Free software programmed in C, so understanding it makes those chapters shorter.
In everyday life: Look for Naemon outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Naemon in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Naemon means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Naemon out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Naemon in simple terms?

Why does Naemon matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Naemon?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Naemon.