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Is it possible to use monit to count the number of instances of a process (in my case Celery) and take an action accordingly.

For example if there are 4 instances of celery daemon, then take action

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up vote 5 down vote accepted

This should be doable using a short shell script, and program status testing. Something like

check program countCelery with path /usr/local/bin/ with timeout 600 seconds:
if status != 0 alert

with a shell script like:

celery_count=$(pgrep -c Celery)
if [[ $celery_count -gt 4 ]]; then
  exit 1
  exit 0
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cool. i will test this right away and let u know – aqs May 22 '13 at 13:25
This worked, thanks a lot – aqs May 23 '13 at 10:18
In the version of Monit we use, the syntax is -- check program countCelery with path /usr/local/bin/ with timeout 30 seconds if status != 0 then alert – tgharold Jun 16 '14 at 20:32

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