# tronyx/docker-nagios architecture

> Architecture diagram of the GitHub repository tronyx/docker-nagios, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-29). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/tronyx/docker-nagios
- Repository: https://github.com/tronyx/docker-nagios

## Overview

Docker-Nagios packages a Nagios monitoring server as a container. Operators provide configuration and access its web interface; Nagios runs configured checks and plugins, while remote agents and passive-check senders supply monitoring data. Results are presented through Nagios and NagiosGraph, with NagiosTV documented as an additional display. The tree shows service launchers and configuration, but no application source excerpts; links for documented, unsampled integrations are therefore limited to README-supported behavior.

Main entry points: [`overlay/opt/nagios/etc/nagios.cfg`](https://github.com/tronyx/docker-nagios/blob/master/overlay/opt/nagios/etc/nagios.cfg) (Nagios Core), [`overlay/etc/sv/apache/run`](https://github.com/tronyx/docker-nagios/blob/master/overlay/etc/sv/apache/run) (Apache service), [`overlay/etc/sv/nsca/run`](https://github.com/tronyx/docker-nagios/blob/master/overlay/etc/sv/nsca/run) (NSCA receiver), [`overlay/etc/sv/nagios/run`](https://github.com/tronyx/docker-nagios/blob/master/overlay/etc/sv/nagios/run) (Nagios service)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_runtime["Container services"]
  node_nagios_service["Nagios service"]
  node_apache["Apache service"]
  node_postfix["Postfix service"]
  node_rsyslog["rsyslog service"]
end

subgraph group_monitoring["Monitoring workflow"]
  node_nagios_core["Nagios Core<br/>[nagios.cfg]"]
  node_plugins["Nagios Plugins<br/>[check_apc.pl]"]
end

subgraph group_integrations["Monitoring integrations"]
  node_graph["NagiosGraph"]
  node_graph_fix["Graph selection fix"]
  node_nrpe["NRPE agent checks"]
  node_ncpa["NCPA agent checks"]
  node_nsca["NSCA receiver"]
  node_xinetd["NSCA xinetd config<br/>[nsca]"]
  node_nagios_tv["NagiosTV display"]
end

subgraph group_configuration["Configuration and results"]
  node_check_config["Check definitions<br/>[localhost.cfg]"]
  node_commands_config["Command definitions<br/>[commands.cfg]"]
  node_templates_config["Object templates<br/>[templates.cfg]"]
  node_cgi_config["Web access config<br/>[cgi.cfg]"]
end

node_operator(("Operator"))
node_container["Nagios container"]
node_remote_hosts(("Monitored hosts"))
node_passive_senders(("Passive check senders"))
node_web_users(("Web users"))
node_mail_relay["Mail relay"]

node_operator -->|"starts container"| node_container
node_nagios_service -->|"starts"| node_nagios_core
node_nagios_core -->|"uses checks"| node_check_config
node_nagios_core -->|"uses commands"| node_commands_config
node_nagios_core -->|"uses templates"| node_templates_config
node_nagios_core -->|"runs checks"| node_plugins
node_nagios_core -.->|"requests remote checks"| node_nrpe
node_remote_hosts -.->|"run agent"| node_nrpe
node_remote_hosts -.->|"run agent"| node_ncpa
node_nagios_core -.->|"requests remote checks"| node_ncpa
node_passive_senders -->|"submit results"| node_nsca
node_xinetd -->|"configures access"| node_nsca
node_nsca -->|"delivers passive results"| node_nagios_core
node_web_users -->|"request interface"| node_apache
node_apache -->|"uses access config"| node_cgi_config
node_apache -->|"serves monitoring interface"| node_nagios_core
node_nagios_core -.->|"provides monitoring data"| node_graph
node_graph -->|"includes selection fix"| node_graph_fix
node_nagios_tv -.->|"displays monitoring"| node_nagios_core
node_nagios_core -.->|"sends notifications"| node_postfix
node_postfix -.->|"relays mail"| node_mail_relay
node_nagios_service -.->|"logs through"| node_rsyslog

click node_nagios_service "https://github.com/tronyx/docker-nagios/blob/master/overlay/etc/sv/nagios/run"
click node_apache "https://github.com/tronyx/docker-nagios/blob/master/overlay/etc/sv/apache/run"
click node_postfix "https://github.com/tronyx/docker-nagios/blob/master/overlay/etc/sv/postfix/run"
click node_rsyslog "https://github.com/tronyx/docker-nagios/blob/master/overlay/etc/sv/rsyslog/run"
click node_nagios_core "https://github.com/tronyx/docker-nagios/blob/master/overlay/opt/nagios/etc/nagios.cfg"
click node_plugins "https://github.com/tronyx/docker-nagios/blob/master/plugins/check_apc.pl"
click node_check_config "https://github.com/tronyx/docker-nagios/blob/master/overlay/opt/nagios/etc/objects/localhost.cfg"
click node_commands_config "https://github.com/tronyx/docker-nagios/blob/master/overlay/opt/nagios/etc/objects/commands.cfg"
click node_templates_config "https://github.com/tronyx/docker-nagios/blob/master/overlay/opt/nagios/etc/objects/templates.cfg"
click node_cgi_config "https://github.com/tronyx/docker-nagios/blob/master/overlay/opt/nagios/etc/cgi.cfg"
click node_graph "https://github.com/tronyx/docker-nagios/tree/master/overlay/opt/nagiosgraph/etc"
click node_graph_fix "https://github.com/tronyx/docker-nagios/blob/master/overlay/opt/nagiosgraph/etc/fix-nagiosgraph-multiple-selection.sh"
click node_nsca "https://github.com/tronyx/docker-nagios/blob/master/overlay/etc/sv/nsca/run"
click node_xinetd "https://github.com/tronyx/docker-nagios/blob/master/overlay/etc/xinetd.d/nsca"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_nagios_service,node_apache,node_postfix,node_rsyslog,node_web_users toneBlue
class node_nagios_core,node_plugins toneAmber
class node_graph,node_graph_fix,node_nrpe,node_ncpa,node_nsca,node_xinetd,node_nagios_tv toneMint
class node_check_config,node_commands_config,node_templates_config,node_cgi_config toneRose
class node_operator,node_container,node_remote_hosts,node_passive_senders,node_mail_relay toneIndigo
```

## Components

### Container services

- [Nagios service](https://github.com/tronyx/docker-nagios/blob/master/overlay/etc/sv/nagios/run): `overlay/etc/sv/nagios/run`
- [Apache service](https://github.com/tronyx/docker-nagios/blob/master/overlay/etc/sv/apache/run): `overlay/etc/sv/apache/run`
- [Postfix service](https://github.com/tronyx/docker-nagios/blob/master/overlay/etc/sv/postfix/run): `overlay/etc/sv/postfix/run`
- [rsyslog service](https://github.com/tronyx/docker-nagios/blob/master/overlay/etc/sv/rsyslog/run): `overlay/etc/sv/rsyslog/run`

### Monitoring workflow

- [Nagios Core](https://github.com/tronyx/docker-nagios/blob/master/overlay/opt/nagios/etc/nagios.cfg): `overlay/opt/nagios/etc/nagios.cfg`
- [Nagios Plugins](https://github.com/tronyx/docker-nagios/blob/master/plugins/check_apc.pl): `plugins/check_apc.pl`

### Monitoring integrations

- [NagiosGraph](https://github.com/tronyx/docker-nagios/tree/master/overlay/opt/nagiosgraph/etc): `overlay/opt/nagiosgraph/etc`
- [Graph selection fix](https://github.com/tronyx/docker-nagios/blob/master/overlay/opt/nagiosgraph/etc/fix-nagiosgraph-multiple-selection.sh): `overlay/opt/nagiosgraph/etc/fix-nagiosgraph-multiple-selection.sh`
- **NRPE agent checks**
- **NCPA agent checks**
- [NSCA receiver](https://github.com/tronyx/docker-nagios/blob/master/overlay/etc/sv/nsca/run): `overlay/etc/sv/nsca/run`
- [NSCA xinetd config](https://github.com/tronyx/docker-nagios/blob/master/overlay/etc/xinetd.d/nsca): `overlay/etc/xinetd.d/nsca`
- **NagiosTV display**

### Configuration and results

- [Check definitions](https://github.com/tronyx/docker-nagios/blob/master/overlay/opt/nagios/etc/objects/localhost.cfg): `overlay/opt/nagios/etc/objects/localhost.cfg`
- [Command definitions](https://github.com/tronyx/docker-nagios/blob/master/overlay/opt/nagios/etc/objects/commands.cfg): `overlay/opt/nagios/etc/objects/commands.cfg`
- [Object templates](https://github.com/tronyx/docker-nagios/blob/master/overlay/opt/nagios/etc/objects/templates.cfg): `overlay/opt/nagios/etc/objects/templates.cfg`
- [Web access config](https://github.com/tronyx/docker-nagios/blob/master/overlay/opt/nagios/etc/cgi.cfg): `overlay/opt/nagios/etc/cgi.cfg`

### Other components

- **Operator**
- **Nagios container**
- **Monitored hosts**
- **Passive check senders**
- **Web users**
- **Mail relay**

## Connections

- Operator → Nagios container: starts container
- Nagios service → Nagios Core: starts
- Nagios Core → Check definitions: uses checks
- Nagios Core → Command definitions: uses commands
- Nagios Core → Object templates: uses templates
- Nagios Core → Nagios Plugins: runs checks
- Nagios Core → NRPE agent checks: requests remote checks
- Monitored hosts → NRPE agent checks: run agent
- Monitored hosts → NCPA agent checks: run agent
- Nagios Core → NCPA agent checks: requests remote checks
- Passive check senders → NSCA receiver: submit results
- NSCA xinetd config → NSCA receiver: configures access
- NSCA receiver → Nagios Core: delivers passive results
- Web users → Apache service: request interface
- Apache service → Web access config: uses access config
- Apache service → Nagios Core: serves monitoring interface
- Nagios Core → NagiosGraph: provides monitoring data
- NagiosGraph → Graph selection fix: includes selection fix
- NagiosTV display → Nagios Core: displays monitoring
- Nagios Core → Postfix service: sends notifications
- Postfix service → Mail relay: relays mail
- Nagios service → rsyslog service: logs through