check server services and notify you by email or webhook (slack+discord) if service is down and restart didnt work

check-server-services.sh

#!/bin/bash
# check services status
# if that service is not running
# it will start the service and send an email/webhook to you
# if the restart does not work, it sends an email/webhook and then exits


# your email address / discord /slack webhook. 
# one at least must be filled
# if we using discord, add "/slack" after webhook as in:
# https://discord.com/developers/docs/resources/webhook#execute-slackcompatible-webhook
EMAIL=""
SLACK_WEBHOOK=""

# list your services you want to check
SERVICES=( 'mysql' 'supervisor' 'redis-server' 'caddy' )

#### OK. STOP EDITING ####


function notify {
  if [ ! -z "$EMAIL" ]
  then
    echo $2 | mail -s "$1" "$EMAIL");
  fi
  
  if [ ! -z "$SLACK_WEBHOOK" ]
  then
    curl -H "Content-Type: application/json" -X POST -d "{\"text\": $1 "\n" $2}" $SLACK_WEBHOOK
  fi
  
}


 for i in "${SERVICES[@]}"
  do
 ###CHECK SERVICE####
 `pgrep $i >/dev/null 2>&1`
 STATS=$(echo $?)

 ###IF SERVICE IS NOT RUNNING####
 if [[  $STATS == 1  ]]

  then
  ##TRY TO RESTART THAT SERVICE###
  service $i start

  ##CHECK IF RESTART WORKED###
  `pgrep $i >/dev/null 2>&1`
  RESTART=$(echo $?)

  if [[  $RESTART == 0  ]]
   ##IF SERVICE HAS BEEN RESTARTED###
   then

    ##REMOVE THE TMP FILE IF EXISTS###
    if [ -f "/tmp/$i" ]; 
    then
     rm /tmp/$i
    fi

    ##notify
    MESSAGE="$i was down, but I was able to restart it on $(hostname) $(date)  "
    SUBJECT="$i was down -but restarted-  on $(hostname) $(date) "
    notify $SUBJECT $MESSAGE

   else
    ##IF RESTART DID NOT WORK###

    ##CHECK IF THERE IS NOT A TMP FILE###
    if [ ! -f "/tmp/$i" ]; then

     ##CREATE A TMP FILE###
     touch /tmp/$i

     ##notify
     MESSAGE="$i is down on $(hostname)  at $(date)  "
     SUBJECT=" $i  down on $(hostname) $(date) "
     MESSAGE="${MESSAGE} I tried to restart it, but it did not work"
     notify $SUBJECT $MESSAGE

    fi
  fi
 fi



  done
exit 0;