systemd — alert on any failed unit on the host · monitoring cookbook · Enterno.io

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systemd — alert on any failed unit on the host

One of several systemd units (cron, redis, postfix) crashed at 3 AM and never came back. Learned about it from complaints. Want an endpoint showing high whenever any unit is failed.

Stack: systemd · bash · cron Tags: systemd, linux, services

Recipe

bash

#!/usr/bin/env bash
# Wraps `systemctl --failed` for an HTTP-monitor probe.
FAILED=$(systemctl --failed --no-legend --plain --quiet 2>/dev/null | wc -l)
[ "$FAILED" -gt 0 ] && {
  NAMES=$(systemctl --failed --no-legend --plain | awk '{print $1}' | head -5 | tr '\n' ' ')
  echo "high $FAILED failed: $NAMES"
  exit 1
}
echo "ok"

Same thing in Enterno.io

Expose the endpoint via nginx or a mini-server, point an Enterno HTTP monitor at it with "ok" keyword — pager-grade monitoring for every systemd unit in one line. Cheaper than any APM.

Set up HTTP monitor → ← All recipes