Hey he's a good continuation question. If the stop/start calls are forked,
what does monit do when I call it to restart a service? Does the stop call
in that instance wait for completion before continuing?
Thanks.
- Chris
From: "Chris McKenzie" <[EMAIL PROTECTED]>
Reply-To: This is the general mailing list for monit
<[email protected]>
To: [email protected]
Subject: Re:Can monit block/wait on start/stop exec at all? (Chris McKenzie
Date: Thu, 17 May 2007 13:38:12 -0400
Its not horribly wrong, monit forks the program call and only notes if the
forked execution failed or not. (which is reasonable) The next polling
interval will determine if the process is running or not. (which is why
when you start a proc from monit its status is "initializing" until the
next interval, at which point is set to "running")
I want to know if I can get monit to wait for the program exec to complete
despite this understanding. If not, I'd like to see a configurable option
that can be included in the process' config to do so in a future version.
Doing this would go a long way to addressing problem e-mail's like ours. I
don't monitor the mailing list much anymore but I've seen more than a
couple with this question.
As a work around I've decided to go with a monit unmonitor, then call the
init.d script. When it comes time to start it up I call monit start so it
starts and monitors in a single call.
Thanks!
- Chris
From: "Jason L. Buberel" <[EMAIL PROTECTED]>
Reply-To: This is the general mailing list for monit
<[email protected]>
To: [email protected]
Subject: Re:Can monit block/wait on start/stop exec at all? (Chris
McKenzie
Date: Thu, 17 May 2007 09:47:43 -0700
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
[EMAIL PROTECTED] wrote:
----------------------------------------------------------------------
Date: Thu, 17 May 2007 11:51:28 -0400
From: "Chris McKenzie" <[EMAIL PROTECTED]>
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
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