How Puppet can evaluate the output od command?

[shlo....@gmail.com]

Hi,

I want to run a command something like:

cat /tmp/aao | grep aa | wc -l

Check the output of that command,  if the output is '0', I want to get a failure from puppet.
I tried to use 'exec' with 'returns' but it's seem that 'returns' take the return code of the command and not the output of the command.
How can I do it right?

[Stephen Gran]

On 12/18/2013 08:41 AM, shlo....@gmail.com wrote:
>
> Hi,
>
> I want to run a command something like:

> /cat /tmp/aao | grep aa | wc -l/

> Check the output of that command, if the output is '0', I want to get a
> failure from puppet.
> I tried to use 'exec' with 'returns' but it's seem that 'returns' take
> the return code of the command and not the output of the command.
> How can I do it right?

test $(grep -c aa /tmp/aao) -gt 0

Cheers,

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Stephen Gran
Senior Systems Integrator - theguardian.com
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[shlo....@gmail.com]

I did not understand where exactly put the test line. I tried:

 exec { "ls":
        command => test $(grep -c aa /tmp/aao) -gt 0
        returns => 1,
        path   => "/usr/bin:/usr/sbin:/bin",
    }

I got the error:
Error: Could not retrieve catalog from remote server: Error 400 on SERVER: Could not match $(grep at /etc/puppet/.../init.pp:4 on node agent....

I need the test to run each time Puppet run.
Thank you for your quick response.

[Jeff Bachtel]

The command should be in single quotes, try

exec { "ls":
command => 'test $(grep -c aa /tmp/aao) -gt 0',

returns => 1,
path   => "/usr/bin:/usr/sbin:/bin",
}

Note also that you were missing a comma after the command property, that must be present.

Jeff

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[jcbollinger]

On Wednesday, December 18, 2013 3:40:21 AM UTC-6, shlo....@gmail.com wrote:

I did not understand where exactly put the test line. I tried:

 exec { "ls":
        command => test $(grep -c aa /tmp/aao) -gt 0
        returns => 1,
        path   => "/usr/bin:/usr/sbin:/bin",
    }

I got the error:
Error: Could not retrieve catalog from remote server: Error 400 on SERVER: Could not match $(grep at /etc/puppet/.../init.pp:4 on node agent....

Add

  provider => 'sh'

to the exec.  Or, better, the command

  grep -q 'aa' /tmp/aao

better and more simply matches your intent: it exits 0 if any match is found, or nonzero otherwise.  No need for wc.


John

[shlo....@gmail.com]

Thanks it's working.

But one problem left, each time Puppet run I saw the server in the Dashboard mark as 'Changed'.
Nothing really changed, I need puppet to mark it as 'Unchanged'.
How I can change it so Dashboard will  mark it as 'Unchanged' action?

[Felix Frank]

You should structure your exec resource in such a way that it only runs
if necessary. Parameters you may want to use: onlyif, unless, creates.
Either of those can be of use here.

For what it's worth, this sounds as if you're trying to use puppet for
monitoring a file. This might be valid, but please note that a dedicated
monitoring tool such as Icinga may be more appropriate.

HTH,
Felix