Re:Can monit block/wait on start/stop exec at all? (Chris McKenzie

[Jason L. Buberel]

Chris,

I have run into the same problem you describe below and had event sent a 
message to this list regarding the issue. At the time, I did not receive 
any reply.

I know for a fact that monit is not blocking or waiting for the exec to 
complete when I see lines in my syslog like:

May 15 09:14:37 lenny monit[25262]: 'apache' trying to restart
May 15 09:14:37 lenny monit[25262]: 'apache' stop: /etc/init.d/httpd
May 15 09:14:39 lenny monit[25262]: 'apache' start: /etc/init.d/httpd

Notice the 2-second interval between 'stop' and 'start'? The problem is 
that my 'stop' script contains the following:

sleep 10

So unless my understanding of the theory of relativity is horribly 
wrong, there is definitely a problem here :)

-jason

address@hidden wrote:
> ----------------------------------------------------------------------
>
> Date: Thu, 17 May 2007 11:51:28 -0400
> From: "Chris McKenzie" <address@hidden>
> Subject: Can monit block/wait on start/stop exec at all?
> Hi all.
>
> Can monit block or wait for a stop/start call to complete? I never had any 
> problems with service restart scripts that would call monit to stop a bunch 
> of service, perform some config or maintenance task, then start them back up 
> again on RedHat Enterprise Linux 3, but after upgrading to RHEL4 I've been 
> finding some strange behaviour that's not easy to nail down.
>
> I don't know if its something new in RHEL4 or its kernel but monit will 
> exec/fork the stop call and return or complete its own execution before the 
> process has stopped. Even in cases where I've beefed up the init.d script to 
> most definately wait for all pids to exit before returning.
>
> Is there any way to get monit to block on program exec? This would be super 
> helpful. I understand the reasons it currently doesn't and I'm fine with 
> that. But if you could identify a single process in its config and block on 
> the program's exec, it would make integrating/automating monit that much 
> easier.
>
> I can always build a wait block after the monit stop service calls before 
> continuing but its the kind of thing you put into the init script.
>
> Thanks!
>
> - Chris
>
>