Essential Automation Scripts Every DevOps Engineer Needs

(1) Ensuring regular backups of system states and configurations through automation

#!/bin/bash

SOURCE=”path/to/source”

DEST=”path/to/dest”

DATE=$(date +%Y%m%d%H%M%S)

ARCHIVE_NAME=”backup_$DATE.tar.gz”

mkdir -p “$DEST”

tar -czvf “$DEST/$ARCHIVE_NAME” “$SOURCE”

if [ $? -eq 0 ]; then

echo “backup sucess: $DEST/$ARCHIVE_NAME”

else

echo “backup failed”

exit 1

fi

(2) Incremental Backup Script

#!/bin/bash

SOURCE=” path/to/source”

DEST=” path/to/dest”

DATE=$(date +%Y%m%d%H%M%S)

LATEST=”$DEST/latest”

NEW=”$DEST/$DATE”

mkdir -p “$NEW”

if [ -e “$LATEST” ] ; then

rsync -a --dest-link=”$LATEST” “$SOURCE” “$NEW”

else

rync -a “$SOURCE” “NEW”

fi

(3) Automated service health checks to verify if critical services are running, and restarted them automatically if they were found inactive or failed

#!/bin/bash

service=”$service”

if ! systemctl is-active --quiet $service; then

echo “$service is not running ..restarting”

systemctl restart $service

else

echo “$service is running fine”

fi

(4) Website Health Check Script

#!/bin/bash

URL=” https://www.example.com”

if curl -s --head --request GET $URL | grep “200 OK” > /dev/null ; then

echo “$URL is up”

else

echo “$URL is down”

fi

(5) Basic Network Connectivity Check Script

#!/bin/bash

host=” www.example.com”

if ping -c 1 “$host” > /dev/null; then

echo “$host is reachable”

else

echo “$host is not reachable”

fi

(6) Software Installation Script

#!/bin/bash

software_list=( “git” “curl” “tree” )

for Sofware in “${software_list[@]}” ; do

echo “Installing software …”

sudo apt install $software -y

done

echo “Installation complete”

(7) Script to Check File Existence

#!/bin/bash

file=filename

if [ -e “$file” ]; then

echo “$file exists”

else

echo “$file doesn’t exists”

fi

(8) Monitoring system health and triggering alerts for anomalies

(a) CPU usage and alert if it exceeds 90%

[ $(top -bn1 | grep "Cpu(s)" | awk '{print $2 + $4}' | xargs printf "%.0f\n") -gt 90 ] && echo "CPU usage above 90%" | mail -s "CPU Alert" user@example.com

(b) Memory usage and alert if it exceeds 90%

[ $(free -m | awk 'NR==2{print $3*100/$2}' | xargs printf "%.0f\n") -gt 90 ] && echo "High memory usage!" | mail -s "Memory Alert" user@example.com

(b) Disks Space usage and alert if it exceeds 90%

[ $(df / | awk 'NR==2 {print $5}' | tr -d '%' | xargs printf "%.0f\n") -gt 90 ] && echo "diskspace usage above 90%" | mail -s "diskspace Alert" user@example.com