monitoring-plugins/restart_service

#!/bin/bash
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
while getopts "s:t:a:S:" opt; do
  case $opt in
    s)
      servicestate=$OPTARG
      ;;
    t)
      servicestatetype=$OPTARG
      ;;
    a)
      serviceattempt=$OPTARG
      ;;
    S)
      service=$OPTARG
      ;;
  esac
done

if ( [ -z $servicestate ] || [ -z $servicestatetype ] || [ -z $serviceattempt ] || [ -z $service ] ); then
  echo "USAGE: $0 -s servicestate -z servicestatetype -a serviceattempt -S service"
  exit 3;
else
  # Only restart on the third attempt of a critical event in soft state and in first attempt of a critical event in hard state
  if [ $servicestate == "CRITICAL" ] && ( ( [ $serviceattempt -eq 3 ] && [ $servicestatetype == "SOFT" ] ) || ( [ $serviceattempt -eq 1 ] && [ $servicestatetype == "HARD" ] ) ); then
    pidof systemd >/dev/null
    if [ $? -eq 0 ]; then
      sudo systemctl restart $service
    else
      sudo service $service restart
    fi
  fi
fi