Monitor server cpu resources with email notification

I thought I’d write a quick script to keep an eye on which processes/users are using too many cpu cycles on my CentOS server. This checks the usage over the previous 5 minutes and emails a detailed list of cpu-hungry processes if it’s over the defined limit. Run it from cron to keep an eye on those resources:

CPU_LIMIT="10" # relevant to number of cores, so quad-core at capacity is 4
  if [ $(echo "$(cat /proc/loadavg | cut -d " " -f 2) >= $CPU_LIMIT" | bc) = 1 ]; then
ps ax --sort=-pcpu o user,pid,pcpu,pmem,vsz,rss,stat,time,comm | mail -s "CPU OVER LIMIT ON `hostname`" $EMAIL

That’s all folks!