E-mail alert when disk space gets low
The following script alerts you when any of your HDD partitions is almost full. For email sending you need to have mailx installed (in CentOS: yum install -y mailx).
#!/bin/sh
MAX_ALLOWED_USAGE_IN_PERCENTAGE=90
ALERT_SEND_TO="nekimail@example.com"
HUMAN_FRIENDLY_SERVER_NAME="MYSERVER - `hostname -I`"
if [ -n "$(df -P | awk "{ df=strtonum(\$5); if (df > ${MAX_ALLOWED_USAGE_IN_PERCENTAGE}) print; }")" ] ; then
echo "$(df -Ph | awk "{ df=strtonum(\$5); if (df > ${MAX_ALLOWED_USAGE_IN_PERCENTAGE}) print; }")" | mail -s "${HUMAN_FRIENDLY_SERVER_NAME} - HDD space problem | Used >${MAX_ALLOWED_USAGE_IN_PERCENTAGE}%" ${ALERT_SEND_TO}
fi
exit 0