systemd unit monitoring setup

Scripts

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#!/usr/bin/env bash

# place in a file called email-unit-status.sh on the PATH
# requires you to have set /etc/admin-email to contain the address to receive the messages
# requires install of ansi2html
#

set -e

dest=$( cat /etc/admin-email )

userflag=
if [[ $HOME == /home/* ]]; then
  userflag=--user
fi

html=$(SYSTEMD_COLORS=1 systemctl $userflag status --full "$1" | ansi2html -w -c)

/usr/sbin/sendmail -t <<ERRMAIL
To: $dest
From: systemd <${USER}@${HOSTNAME}>
Subject: SystemD unit failure alert: $1
Content-Transfer-Encoding: 8bit
Content-Type: text/html; charset=UTF-8
Mime-Version: 1.0

$html
ERRMAIL

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# Create in /etc/systemd/[email protected]

[Unit]
Description=Email status for %i to the admin
After=network.target

[Service]
Type=oneshot
ExecStart=email-unit-status %i


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# Use like this

[Unit]
Description=System Backup
Wants=network-online.target
After=network-online.target
ConditionACPower=true
OnFailure=email-unit-status@%n.service