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Overview
Nagios Core is a C monitoring engine for servers, network devices, and services such as HTTP. It evaluates plugin results and combines notifications, event handlers, history, and an optional web interface into an operator-controlled monitoring system.
Features and best fit
Hands-on tested within the scope below · Content checked:
Key features
Turn plugin results into failure and recovery notifications
It can monitor network services such as SMTP, POP3, HTTP, and PING, along with host resources such as processor load and disk usage. Custom checks can be added through plugins, and notifications can be sent when problems occur and recover.
Sources: [1]
Distinguish an unreachable path from a failed host
Parent hosts define a network hierarchy, allowing the engine to distinguish a host that is down from one hidden behind a failed path. Event handlers can invoke recovery actions when state changes occur.
Sources: [1]
Best fit
Before adoption
Plan the core, plugins, notifications, and web interface together
Nagios Core does not supply every target-specific check by itself. The official quickstart installs the core and Nagios Plugins separately and configures Apache and PHP when the web interface is needed. Run nagios -v after configuration changes so errors are found before startup.
Nagios Core 4.5.14 / Docker 29.4.0 with debian:13-slim on a local arm64 host
Built the core and sample configuration in a disposable image, then ran nagios -v and observed 0 warnings, 0 errors, and a successful pre-flight check.
Official sources
- [1]Nagios Core 4.5.14 README(2026-10-04)
- [2]Nagios Core 4.5.14 installation pointer(2026-10-04)
- [3]Nagios Core 4.5.14 configure source(2026-10-04)
- [4]Nagios Core 4 Ubuntu quickstart(2026-10-04)
- [5]Nagios Core 4.5.14 release(2026-10-04)
- [6]Nagios Core 4.5.14 license(2026-10-04)
Supplemental curator note
Its plugin model and file-based configuration make it useful when checks must match an existing mix of devices and servers and remain reviewable. Plan the required plugins, notification paths, web interface, and permissions before rollout.
Try it in 3 steps
- 1
Enter the 4.5.14 source tree
On a system with Git and Docker, fetch only the published 4.5.14 tag and enter its working directory.
git clone --depth 1 --branch nagios-4.5.14 https://github.com/NagiosEnterprises/nagioscore.git nagioscore-demo && cd nagioscore-demo - 2
Create a Dockerfile for an isolated build
Define a Debian 13 build with the compiler, gperf, GD, OpenSSL, and other required packages, then install the core and sample configuration under /opt/nagios without installing it on the host.
printf '%s\n' 'FROM debian:13-slim' 'RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends autoconf gcc gperf libc6-dev make libgd-dev libssl-dev perl unzip ca-certificates && rm -rf /var/lib/apt/lists/*' 'WORKDIR /src' 'COPY . .' 'RUN groupadd --system nagios && useradd --system --gid nagios nagios && ./configure --prefix=/opt/nagios --with-nagios-user=nagios --with-nagios-group=nagios --with-command-group=nagios && make -j2 all && make install && make install-config' 'CMD ["/opt/nagios/bin/nagios","-v","/opt/nagios/etc/nagios.cfg"]' > Dockerfile.quickstart - 3
Build and run the configuration preflight
Build the isolated image and use nagios -v to load the sample configuration. Confirm Total Errors: 0 and a successful pre-flight check; the verification container then exits and is removed.
docker build --file Dockerfile.quickstart --tag nagioscore-demo:4.5.14 . && docker run --rm nagioscore-demo:4.5.14
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Development activity
Last 90 days · weekly
- Commits (last 30 days)
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- Open PRs
- 5
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