I am trying to use monit in our organization and I got confused by few things.
Can one of you help me?
1. I wanted to use check program to check a status of existing
application
So I placed this entry
check program app with path "/home/alex/bin/app_ctl status"
start program = "/home/alex/bin/app_ctl start" as uid alex and gid alex
stop program = "/home/alex/bin/app_ctl stop" as uid alex and gid alex
if status != 0 then restart
Monit detected my application being down but then said that Stop, start, or
restart methods are not defined for process check app
2. This app listens on sip port so I wanted to check for response and
restart if it fails.
check host myhost with address "myhost"
start program = "/home/alex/bin/app_ctl start" as uid alex and gid alex
stop program = "/home/alex/bin/app_ctl stop" as uid alex and gid alex
if failed
port 5060 type UDP protocol SIP
with target "myhost:5060" and maxforward 1
then restart
Monit detected my application being unresponsive but then said that "Stop,
start, or restart methods are not defined for process check myhost"
I see that if I use check process with pid | match action stop / start
methods do work. But documents are not clear on the scope of the action
methods, at least it is not clear to me why alert, monitor, exec would work and
stop / start / restart not in this case. I am sure I am doing something wrong
here but I am new to this project.
I tried using exec instead of start restart . My app_ctl can do restart as
well. But I noticed that for some reason this is not very reliable as exec
cycles through multiple restarts until the whole thing settles down.
I am doing something like
check program app with path "/home/alex/bin/app_ctl status"
if status != 0 then exec = "/home/alex/bin/app_ctl restart" as uid
alex and gid alex
It seems to me that negative status is being retained in the next cycle. It
keeps restarting the process at least several times. I ran exec with start
instead of the restart and after it successfully started process on the first
cycle it attempted to start it again which my app_ctl objected to with message
App is still running please stop it first...
Two cycles later I see the messages (running in console mode for debugging)
monit: Cannot open proc file /proc/15247/stat -- No such file or directory
system statistic error -- cannot read /proc/15247/stat
monit: Cannot open proc file /proc/15248/stat -- No such file or directory
system statistic error -- cannot read /proc/15248/stat
monit: Cannot open proc file /proc/15249/stat -- No such file or directory
system statistic error -- cannot read /proc/15249/stat
Needless to say I have tested my app_ctl script and running it
from shell I can stop start and restart app without any issues. It properly
detects PID and status of app.
Sorry for a long post, monit got me excited because it presented
many interesting opportunities and has a long history. Any help would be
appreciated.
Alex
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