Re: automatic resume of monitoring, is it possible?

[Martin Pala]

Hello,

The action "monitor" really doesn't exist - i have fixed the documentation. The 
"monitor" action wouldn't make sense, as the service is monitored already.

The "stop" action stops the service and disables monitoring => monit doesn't 
check the service anymore until the monitoring is enabled again (using "monit 
monitor ... or "monit start ...").

The setup which should work in your case:

--8<--
check file file1 with path "/tmp/file1"
    if failed permission 555 then exec "/usr/bin/monit stop file2" else if 
succeeded then exec "/usr/bin/monit start file2"

check file file2 path "/tmp/file2"
    if failed permission 555 then alert
--8<--

=> if the permissions fail, the "file2" service is stopped, but the monitoring 
of "file1" service continues. If "file1" recovers, the "file2" is started again.

Regards,
Martin


On Feb 27, 2011, at 1:58 AM, John (yt) Hogenmiller wrote:

> Hello list,
> 
> I've been playing with monit in hopes of using it to monitor a
> wireless installation.  At first, it looked like
> it was doing ok, but then I noticed the "depends on" wasn't working as
> I had hoped.  If deviceA is unreachable, deviceB
> and deviceC will also be unreachable, so I setup my depends on
> accordingly, but I still got alerts for all three services.
>       
> After looking further into the documentation, it seems "depends on"
> requires monitoring to be stopped on a service for the depends
> on service to stop monitoring.  That's fine, but I'm looking for a way
> to restart monitoring automatically.    In our scenario, if a device
> goes
> unpingable, someone would have to physically power cycle it to bring
> it back online (or potentially replace the device).
> 
> The documentation wasn't too clear (at least to me) on a way to
> configure monit this way, so setup an instance that
> polled every 10 seconds and monitored two files.  All the steps I took
> are below.  If anyone can look at my testing and offer advice,
> I'd appreciate it.  Perhaps I'm reading the documentation wrong, or
> perhaps there's just now way to do what I'm trying (perhaps
> M/Monit has such capabilities).
> 
> I originally tested under 5.0.3 (latest with Ubuntu/apt-get), but then
> upgraded to 5.2.4 hoping for different results.
> 
> First, my checks:
> 
> 
>       check file file1 with path "/tmp/file1"
>              if failed permission 555 then unmonitor
>               # manul implies that I can do "else if succeeded then monitor", 
> but
> this fails syntax
>                else if succeeded then alert
> 
>       check file file2 path "/tmp/file2"
>          if failed permission 555 then alert
>          depends on file1
> 
> 
> changing /tmp/file1 to 500 does indeed stop monitoring on file1 and file2
> 
> [EST Feb 26 13:30:47] debug    : monitor service 'file1' on user request
> [EST Feb 26 13:30:47] info     : Awakened by User defined signal 1
> [EST Feb 26 13:30:47] info     : monit daemon at 31932 awakened
> [EST Feb 26 13:30:47] info     : 'file1' monitor action done
> 
> 
> On a lark, I updated my config like so:
> 
>       check file file1 with path "/tmp/file1"
>               if failed permission 555 then stop
>               else if succeeded then start
> 
>       check file file2 path "/tmp/file2"
>               if failed permission 555 then alert
>               depends on file1
> 
> 
> Upon changing file1 to 500, both services went into not monitored
> 
> Upong changing file1 back to 555, services did not resume.  If
> manually tell it to start monitoring file1, file2 does not
> automatically begin monitoring again.
>               
>               
>               
> Other notes:
> I had a whole bug report showing that you can't restart monitoring a
> service from the command line, but I realised that was a bug
> in 5.0.3, which is the latest Ubuntu provides, but this was fixed once
> I downloaded 5.2.4.   I only mention this for anyone else using monit
> from the Ubuntu repositories.
> 
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