icinga2-checks/check_process.sh

#!/usr/bin/env bash

# Check if a process is running using Icinga2 and pgrep
# Usage: ./check_process.sh -p <process_name> -s <pretty_service_name>

# Exit codes
STATE_OK=0
STATE_WARNING=1
STATE_CRITICAL=2
STATE_UNKNOWN=3

# Check if the process name and pretty service name are provided
while getopts ":p:s:" opt; do
  case $opt in
  p)
    process_name="$OPTARG"
    ;;
  s)
    pretty_service_name="$OPTARG"
    ;;
  \?)
    echo "Invalid option: -$OPTARG" >&2
    exit $STATE_UNKNOWN
    ;;
  :)
    echo "Option -$OPTARG requires an argument." >&2
    exit $STATE_UNKNOWN
    ;;
  esac
done

if [ -z "$process_name" ]; then
  echo "UNKNOWN - Process name not provided"
  exit $STATE_UNKNOWN
fi

if [ -z "$pretty_service_name" ]; then
  pretty_service_name="$process_name"
fi

if uname | grep -q "BSD"; then
  # have to run pgrep with sudo in BSD
  process_count=$(sudo pgrep -f "$process_name" 2>/dev/null | wc -l)
else
  process_count=$(pgrep -f "$process_name" 2>/dev/null | wc -l)
fi

if [ $? -ne 0 ]; then
  echo "UNKNOWN - Check failed"
  exit $STATE_UNKNOWN
elif [ $process_count -gt 0 ]; then
  echo "OK - $pretty_service_name is running"
  exit $STATE_OK
else
  echo "CRITICAL - $pretty_service_name is not running"
  exit $STATE_CRITICAL
fi