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Add server-side health checks for service online status

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- update-health.js: pings every service URL from script.js (single
  source of truth) in parallel every minute via cron and writes
  health.json; any HTTP response below 500 counts as online, 5xx as
  error, timeouts/DNS failures as offline; TLS validity ignored
- Card badges now show real state instead of a static Online label:
  grey Checking, green Online (with latency tooltip), amber Error
  (HTTP code), red Offline (reason); refreshed every 30 s
- Entrypoint runs a first sweep at boot; nginx serves /health.json
  with no-cache; README documents the behavior
This commit is contained in:
fegger
2026-09-04 14:15:08 +02:00
parent e766fcd95c
commit 012eee6c45
7 changed files with 194 additions and 7 deletions
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Dockerfile
+2 -2
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@@ -12,8 +12,8 @@ COPY nginx.conf /etc/nginx/conf.d/default.conf
# Backend scripts (node_modules included so the build works offline).
COPY api /opt/dashboard
# Cron refreshes the data feed every 15 minutes.
RUN echo '*/15 * * * * cd /opt/dashboard && node update-data.js' > /etc/crontabs/root
# Cron refreshes the data feed every 15 minutes and health checks every minute.
RUN printf '*/15 * * * * cd /opt/dashboard && node update-data.js\n* * * * * cd /opt/dashboard && node update-health.js\n' > /etc/crontabs/root
# Entrypoint: run updater once, start API proxy + cron, then nginx.
COPY docker-entrypoint.sh /docker-entrypoint.sh