import script

systemd_units.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+#
+# PRTG Advanced Sensor script for systemd units
+#
+# Monitor whether systemd services and other systemd units are active.
+# Each unit to be monitored will be a channel under the sensor. 
+# Unit types other than "service" must have a type suffix specified;
+# mount points (without a suffix) may also work to identify mount units.
+#
+# Requires: bash, systemctl
+#
+
+# Static list of unit names, for example: units=(sshd httpd firewalld)
+units=()
+
+# Expand the units list with unit names received on the command line
+units+=("${@}")
+
+exit_error(){
+    printf "<prtg><error>1</error><text>%s</text></prtg>\n" "$1"
+    exit 1
+}
+
+# Make sure we have all dependencies and at least one unit
+(which systemctl) > /dev/null 2>&1 || exit_error "Cannot find systemctl."
+[[ ${#units[@]} -gt 0 ]] || exit_error "No systemd units specified."
+
+# Define XML format string for unit status
+read -r -d '' UNIT_XML_FMT << 'EOF_UNIT_XML'
+<result>
+  <channel>%s: %s</channel>
+  <value>%d</value>
+  <valuelookup>prtg.standardlookups.activeinactive.stateactiveok</valuelookup>
+</result>
+EOF_UNIT_XML
+
+# Make readings and print the XML-formatted results
+echo "<prtg>"
+for u in "${units[@]}"; do
+    utype="${u##*.}"
+    [[ "${u:0:1}" == "/" ]] && utype="mount"
+    [[ "${u}" == "${utype}" ]] && utype="service"
+    systemctl --quiet is-active "${u}" && v=1 || v=2
+    printf "${UNIT_XML_FMT}\n" "${utype^}" "${u%.${utype}}" "${v}"
+done
+echo "</prtg>"
+
+exit 0