7f188cc12a
These were dropped in b1b4296 when the README was trimmed, which left no
record in the repo of how the script gets onto the server or how it is
scheduled.
Silver Server Ops
Server-wide maintenance scripts and operational notes for the Silver Cloud Hetzner host.
This repo is for host-level improvements that are not tied to one specific app or service. SSL expiry alerts are the first check in the repo; more server-wide maintenance checks can be added here over time.
Implemented Checks
- SSL certificate expiry alerts
SSL Certificate Expiry Alerts
scripts/check-cert-expiry.sh checks every Let's Encrypt certificate under
/etc/letsencrypt/live and sends an ntfy alert when any certificate expires in
less than 14 days.
Install
sudo install -m 0755 scripts/check-cert-expiry.sh /opt/scripts/check-cert-expiry.sh
Root cron
15 8 * * * /opt/scripts/check-cert-expiry.sh >>/var/log/cert-expiry-check.log 2>&1
Defaults
CERT_DIR=/etc/letsencrypt/live
EXPIRY_DAYS=14
NTFY_URL=https://ntfy.silverwal.com/certbot
ALERT_ON_NO_CERTS=true
Overrides
EXPIRY_DAYS=21 /opt/scripts/check-cert-expiry.sh
If the ntfy topic is protected with an access token:
NTFY_TOKEN=your-token /opt/scripts/check-cert-expiry.sh
Manual test
sudo /opt/scripts/check-cert-expiry.sh
The script exits 0 when all certificates are healthy and 1 when it sends an
alert or cannot run the check correctly.
Notification Notes
ntfy is a good default for this server because it is already self-hosted, simple to call from shell scripts, and supports useful alert metadata such as title, priority, and tags.
For jobs where silence is also a failure, pair ntfy with a dead man's switch such as Healthchecks. ntfy tells you what the script found; Healthchecks tells you when the script did not run at all.