Server's RAM usage notification

grupogua

Hi guys! Is there a way to set a RAM threshold notification? (without been continuously looking at the dashboard graphics)

sean

grupogua we don't send RAM quota notifications at this time, but it is on our our TODO list.

If you'd like to use a cron job to notify you when your RAM exceeds a certain threshold then you can do something like this in your crontab:

# change MAILTO to a valid email address
MAILTO="you@domain.com"
# change RAMQUOTA to your quota in MB
RAMQUOTA=1024
*/5 * * * * PSS=$( for pid in $( pgrep -u $USER ); do grep -s -i pss /proc/$pid/smaps; done | awk '{sum+=$2} END {printf "\%d", sum/1000}' ); (( $PSS < $RAMQUOTA )) || echo "over quota: $PSS > $RAMQUOTA"

That will run every 5 minutes and will send you an email if your calculated RAM usage exceeds your quota.

grupogua

This is Great, thanks! ... and if I have multiple shell users? can I do a cron job checking the TOTAL (sum of all those users)?)

sean

grupogua No, sorry. Your individual shell users do not have access to the other users processes so you can't run a single cron job that checks all of them. Instead you'll need to decide on an appropriate alert threshold for each of your users and use that for the RAMQUOTA value.

vsajip

I tried that cron entry, but I get errors in sh emailed to me:

/bin/sh: -c: line 0: unexpected EOF while looking for matching `''
/bin/sh: -c: line 1: syntax error: unexpected end of file

If I copy and paste bits from that crontab line into sh, I get a different error at the $PSS < $RAMQUOTA bit:

sh-4.2$  PSS=$( for pid in $( pgrep -u $USER ); do grep -s -i pss /proc/$pid/smaps; done | awk '{sum+=$2} END {printf "%d", sum/1000}' )
sh-4.2$ echo $PSS
152
sh-4.2$ (( $PSS < $RAMQUOTA )) || echo "over quota: $PSS > $RAMQUOTA"
sh: ((: 152 <  : syntax error: operand expected (error token is "<  ")

sean

vsajip sorry, my bad! I forgot to escape the % in the command (thanks a lot, cron).

I've updated the example with the correct command, which is:

PSS=$( for pid in $( pgrep -u $USER ); do grep -s -i pss /proc/$pid/smaps; done | awk '{sum+=$2} END {printf "\%d", sum/1000}' ); (( $PSS < $RAMQUOTA )) || echo "over quota: $PSS > $RAMQUOTA"