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kevinveenbirkenbachandClaude Opus 5 c55f508e05 feat(readme): draw mandatory and disabled service relations

The cosmos generator linked a consumer to its provider only through an
'<role>' in group_names reference or an explicit provides: name. A hard
dependency has neither -- pinning the provider on unconditionally is
exactly what removes the Jinja reference the generator was reading -- so
web-svc-asset's bond to web-svc-file vanished from the diagram the moment
it became binding. Match a service key against the provider's own primary
key from the registry, in both directions.

Services the role turns off drew a solid 1:1 edge, claiming a mandatory
relationship for something that carries nothing at deploy time. They now
render as a red 0..0 edge; edge merging gained a real precedence so a
provider consumed through two keys stays live when only one is off.

Named colour, not hex: a '#' opens an entity code in the mermaid lexer and
turns the whole diagram into a parse error on GitHub.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

2026-08-17 18:02:31 +02:00

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Webserver Health Check

Description

This role verifies that each NGINX-served domain returns an expected HTTP status code (200, 301, etc.) and alerts on deviations.

Overview

The role scans NGINX server block .conf files for domains, HEAD-requests each domain, compares the response against per-domain expected codes, and reports mismatches via sys-ctl-alm-compose. It is scheduled via a systemd timer for periodic health sweeps. Include this role and define on_calendar_health_NGINX. The role installs requests via pip automatically.

Cosmos

The diagram places Webserver Health Check in the Infinito.Nexus cosmos: the components it deploys (capabilities), the central services it consumes (dependencies), and its outward reach (federation and bridged external networks).

flowchart LR
    subgraph role [sys-ctl-hlth-webserver 💻]
        svc_webserver["webserver"]
    end

Solid 1:1 edges are fixed relationships; dashed 0..1 edges are conditional (enabled only in matching deployments); red 0..0 edges are turned off in this role. Node markers show the role's deploy modes (💻 host, 🐳 compose, 🐝 swarm); ❌ marks a service that is explicitly turned off, and ⚙️ an Ansible role dependency declared in meta/main.yml.

Features

Domain Detection: Scans NGINX server block .conf files for configured domains.
HTTP Status Verification: HEAD-requests each domain and compares the response against per-domain expected codes.
Alerting: Reports mismatches via sys-ctl-alm-compose.
Scheduled Execution: Integrates with a systemd timer for periodic health sweeps.

Further Resources

Credits

Implemented by Kevin Veen-Birkenbach. Part of the Infinito.Nexus Project and maintained by Kevin Veen-Birkenbach. Licensed under the Infinito.Nexus Community License (Non-Commercial).

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