It's not ideal but this could very easily be achieved by with Zabbix.
With Zabbix you can have a check, running for example every 30
seconds, that runs a checksum on a specific file. Then a trigger that
is activated if the last known checksum varies from the current
checksum, here's an example from one of the default templates,
"{Template - Linux Servers:vfs.file.cksum[/etc/passwd].diff(0)}>0".
Then create an action for that trigger. Actions can initiate remote
commands, which you specify to be a manual run of puppet. This can
get extremely resource intensive, and really isn't ideal.
In my environment I personally don't use Zabbix for this but rather
OSSEC to get email notifications upon changes of key files.
- Trey
On Apr 7, 1:10 am, John Chris Richards <john.chris.richa...@gmail.com>
wrote:
> Hi Nan
>
> First of all thanks for your answer
>
> > Are you trying to trigger a puppet run when a particular file changes?
>
> Yes, this is what I exactly want to do. For example, if a user changes
> /etc/hosts file (via vim for instance), it will be corrupted until the next
> run. What if I don't want to wait until the next run?
>
> Thanks again.
>
> 2011/4/7 Nan Liu <n...@puppetlabs.com>
>
>
>
>
>
>
>
> > On Wed, Apr 6, 2011 at 2:50 PM, John Chris Richards
> > <john.chris.richa...@gmail.com> wrote:
> > > Hi all
>
> > > Firstly, I am new in configuration management and all I know about
> > > watching files is that client checks a file's check sum every t hour
> > > and if a change has occurred then it gets the file from the server.
>
> > > I wonder that if a user changes a file, does the puppet client wait
> > > end of the time (t) or is there way to say client if a change occurs
> > > in a specific file then make an immediate pull? I mean, I don't want
> > > to wait until the time is up. Is there a way to make this in puppet?
>
> > Puppet agent runs periodically to enforce the catalog, it can replace
> > the file if it detects any changes, but it doesn't monitor the file to
> > trigger runs. I suppose you can run puppet continuously (not
> > recommended), but perhaps if you give some insight on what you are
> > trying to accomplish would give us a better idea how to achieve it
> > with puppet. Are you trying to trigger a puppet run when a particular
> > file changes? Are you trying to monitor several files?
>
> > Thanks,
>
> > Nan
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