check_rhel7_service

#!/bin/bash
# 2/16/15
# Created by Taha Ali (tahazohair@gmail.com)
#  
# this nagios plugin basically checks if any service is running and enabled on boot or not. it will only cause a critical 
# alert if the service is not running. tested on rhel7, centos 7 and should also work with earlier releases.
#
#Nagios Exit codes

OK=0
WARNING=1
CRITICAL=2
UNKNOWN=3
ARGC=$#

systemctl --version >/dev/null 2>&1 && systemctl=1
[ "$systemctl" ] || RUNLEVEL=$(LANG=C who -r | sed 's/.*run-level \([0-9]\).*/\1/')

usage() {
cat <<EOF
check status of system services for rhel7 with systemctl
options:
        -s      <service> Specify service name
        -h      print this menu
EOF
}

lsb_to_string() {
  case $1 in
  0) echo "active" ;;
  1) echo "dead" ;;
  2) echo "dead" ;;
  3) echo "inactive" ;;
  *) echo "unknown" ;;
  esac
}


argcheck() {
if [ $ARGC -lt $1 ]; then
        usage
        exit $CRITICAL
fi
}

service_enabled() {
  if [ "$systemctl" ]; then
    systemctl --quiet is-enabled $1.service 2>/dev/null
  else
    chkconfig --levels $RUNLEVEL "$1"
  fi

}

check_svc() {

  printf '%-40s' "$1:"

  bootstatus=$(service_enabled $1 && echo enabled || echo disabled)
  if [ "$systemctl" ]; then
    status=$(systemctl is-active $1.service 2>/dev/null)
    # For "simple" systemd services you get
    # "unknown" if you query a non enabled service
    if [ "$bootstatus" = 'disabled' ]; then
      [ $status = 'unknown' ] && status='inactive'
    fi
  else
    status=$(service $1 status >/dev/null 2>/dev/null ; lsb_to_string $?)
  fi

  if [ "$bootstatus" = 'disabled' ]; then
    bootstatus='(disabled on boot)'
  #else
   # bootstatus=''
  fi

  test "$bootstatus" && status_pad=10 || status_pad=0

  printf "%-${status_pad}s%s\n" "$status" "$bootstatus"

  if [ "$status" != 'active' ]; then
        exit $CRITICAL
  fi
}


while getopts ":hs:" OPTION
        do
                case $OPTION in
                        h)
                                usage
                                exit $OK
                        ;;
                        s)
                                SERVICE="$OPTARG"
                        ;;
                        \?)
                                echo "invalid argument, please use \"$0 -h\" for help"
                                exit 1
                        ;;
                esac
        done


argcheck 1
check_svc $SERVICE