On Apr 10, 5:12 pm, John Chris Richards
wrote:
> Hi all
>
> I wanna take a list of running services on the client instantly. Can I
> do this with puppet?
Not really, no. Puppet does not query client nodes, neither on a
schedule nor on demand, and it does not track information about
resources (such as Services) that are not managed for the node in
question.
> For example, is it possible to write a custom facter and send it to
> the client so I can get the running services information whenever I
> want via REST. Is my logic correct?
No, your logic is not correct. You could certainly write a custom
fact that collects information about the services running on a client,
but that will not allow you to obtain an up-to-date result on demand.
The client will publish the fact value every time it requests a
catalog from the master (every 30 minutes by default), and there are
several ways you could cause the master to store that information
somewhere, but that's not the same thing.
>Or there is another thing to solve
> this problem?
Not in full generality, no, because there's no reliable way to
determine what processes running on the client are "services".
Basically, you can do something like this:
ssh -c "ps -e"
, which gives you all running processe without distinguishing what
might be a service (whatever that means to you). Or you can do
something like this:
ssh -c "for s in $(/sbin/chkconfig --list); do /sbin/
service $s status; done"
, which tells you (on a system with chkconfig) which registered
services are running, as judged by their initscripts' "status"
command. That doesn't tell you anything about unregistered services,
however, and it may not be 100% reliable for registered ones.
Or you can write a custom service inquiry script of any complexity you
desire, push it out to clients with Puppet, and run it at need.
MCollective might provide a convenient interface for issuing the
remote commands (instead of ssh -c), but it doesn't solve the
underlying problem of how to determine what services are running.
John
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