Puppet users - Feb 2010 - Forced service start/stop/restart using puppetrun?

Hi,

we use puppetrun to manage our servers and one thing is missing that
would make my life much easier. Is there a way to start/stop/restart
services directly with puppetrun? I made some experiments but nothing
really worked out. I''m looking for something like this:

# puppetrun --host abcd --host efgh --tag restart_my_service

It''s easy to create a class to restart services but it then get
applied anytime i use puppetrun.

Thanks,

Daniel

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> # puppetrun --host abcd --host efgh --tag restart_my_service
>
> It''s easy to create a class to restart services but it then get
> applied anytime i use puppetrun.
puppet''s idea is to ensure that your system is in a certain state, and
if not do anything to achieve this state. However just executing  
commands is not really the idea.

If you are looking for something to executes commands on demand on  
certain systems have a look at func [1] or mcollective [2].

cheers pete

[1] https://fedorahosted.org/func/
[2] http://code.google.com/p/mcollective/

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Peter Meier wrote:
>> # puppetrun --host abcd --host efgh --tag restart_my_service
>>
>> It''s easy to create a class to restart services but it then
get
>> applied anytime i use puppetrun.
>
> puppet''s idea is to ensure that your system is in a certain state,
and
> if not do anything to achieve this state. However just executing 
> commands is not really the idea.
>
> If you are looking for something to executes commands on demand on 
> certain systems have a look at func [1] or mcollective [2].
>
> cheers pete
>
> [1] https://fedorahosted.org/func/
> [2] http://code.google.com/p/mcollective/
>
Yeah, as I was at least partly responsible for Func, I''ll say in
general
I think you want to *avoid* doing that, if possible, and if there''s a 
use case where that is required, I want it to be doable through puppet 
end-to-end in a puppety way if at all possible.  That''s not all doable 
now, true, but I want to look into it.  Other than starting/stopping 
services, what would you be looking for?   And what are the reasons for 
wanting to start/restart the services in those cases?

As Pete wrote, in the current system, you''d have the service subscribe 
to the configuration file -- meaning that if the configuration file 
changes, Puppet is smart enough to know it should restart the 
service.    This is the way to go, as you are describing your system in 
language, and have a written model of the way it works.   Doing things 
outside that model doesn''t break the model, but it loses the benefits 
and power of it a little.

I think that gets a little tricky when you''re dealing with events that 
span systems, so more data about what kinds of things you are trying to 
do like this would be extremely valuable.   Let me know!

--Michael


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