Disk high usage are one of the common cause of server down. Some administrators would create a 8GB empty file, and once the disk usage is exceeding a threshold, they would just delete the empty 8GB file to regain the disk space and gives enough time for proper fixing/investigation.
Here is a nice BASH script that uses the AWK Programming language to find out the disk usage percentage for the mount point “/” aka root. If it exceeds a threshold e.g. 80%, it will send an email to notify you.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | #!/bin/bash # check_hdd.sh usage=`df -h | awk '{if ($6=="/") {print substr($5,0,length($5)-1)}}'` threshold=80 if [[ $usage -gt $threshold ]]; then echo "Diskspace: $usage% Exceeding $threshold%" # add your command to send an email. For example: echo "Your Server Load $(echo $HOSTNAME) Alert Needs Attention! (High Disk Usage)" | mail -s " $usage% Exceeding $threshold% $(date)" support@helloacm.com php /var/www/mail.php "Your Server $(echo $HOSTNAME) Diskspace: $usage% Exceeding $threshold% $(date)" exit 1 else echo "Diskspace: $usage%" exit 0 fi |
#!/bin/bash
# check_hdd.sh
usage=`df -h | awk '{if ($6=="/") {print substr($5,0,length($5)-1)}}'`
threshold=80
if [[ $usage -gt $threshold ]]; then
echo "Diskspace: $usage% Exceeding $threshold%"
# add your command to send an email. For example:
echo "Your Server Load $(echo $HOSTNAME) Alert Needs Attention! (High Disk Usage)" | mail -s " $usage% Exceeding $threshold% $(date)" [email protected]
php /var/www/mail.php "Your Server $(echo $HOSTNAME) Diskspace: $usage% Exceeding $threshold% $(date)"
exit 1
else
echo "Diskspace: $usage%"
exit 0
fiYou can save this as check_hdd.sh (and make sure you give it a proper permission e.g. chmod +x) and put this in Crontab Job that schedules running every hour or so.
–EOF (The Ultimate Computing & Technology Blog) —
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