I have a similar question. I tried iWatch but ATM it doesnt seem to email me. but also i dont believe it will watch disk space. That isnt advertise on their homepage.
What app can i use to email me when the disk is getting low? Can i use the same app to watch folders for filechanges? (and exclude a subfolder such as lucene which is expected to change)
In a former life without monitoring systems and automatic warnings I had use for this snippet:
#!/bin/sh
df -H | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{ print $5 " " $1 }' | while
read output;
do
echo $output
usep=$(echo $output | awk '{ print $1}' | cut -d'%' -f1 )
partition=$(echo $output | awk '{ print $2 }' )
if [ $usep -ge 90 ]; then
echo "Running out of space \"$partition ($usep%)\" on $(hostname)
as on $(date)" |
mail -s "Alert: Almost out of disk space $usep%" your@email.tld
fi
done
If you are monitoring more than just this server, make yourself and your company a big favour and use a proper monitoring server like nagios. We use opsview community edition because it is free like nagios and has a great web interface so you do not need to be a linux admin to add/remove hosts/services.
One-liner for cron:
MAXUSE=`df |sed 's/^.* \([0-9][0-9]*\)%.*$/\1/g' \
|sort -nr \
|head -1` \
sh -c 'if [[ ${MAXUSE} > 95 ]]; then echo "Usage at ${MAXUSE}%"; fi'
Note that cron only e-mails when there is output. So a cron script that runs but prints nothing will trigger no e-mails.
