Automation_for_Monitoring_on_LINUX_machines.sh

#!/usr/bin/bash

DATE=$(date)    //This variable will contain the current system time
MACHINE=$(uname -n)   //This variable will contain the hostname
dusage=$(df -Ph | grep -vE '^tmpfs|cdrom' | sed s/%//g | awk '{if($5>75) print $0;}')
fscount=$(echo "$dusage" | wc -l )
WORKER_STATE=$(systemctl show -P ActiveState airflow-worker | sed 's/ActiveState=//g') //This variable will contain the state of the service running on slave node

if[$fscount -ge 2]; then
echo "$dusage" | mail -r server@abc -s "Airflow Disk Space Alert On $(hostname) at $(date)" xyz@example.com
fi

if [ "$WORKER_STATE" != "active" ]; then    //This will check if the state of service is running or not in the server.
  mail -r server@abc -s 'Airflow Service Not Running Alert' xyz@example.com << EOF    //If condition is true it will send mail with subject line to the recepient
$DATE   //It will print the current date in mail body
ALERT ON $MACHINE :    //It will print the machine name in mail body
Airflow worker is $WORKER_STATE   //It will print the status of the server. e.g., inactive(dead)
EOF
dzdo systemctl restart airflow-worker   //It will restart the service
fi

date    //It will print the date on the LINUX machine
df -P | awk '0+$5 >= 70 {print}'    //It will print the rows where usage is greater than threshold on the LINUX machine
systemctl status airflow-worker   //It will show the status of service on the LINUX machine
systemctl status iptables   //It will show the status of service on the LINUX machine