On Thu, Oct 20, 2011 at 11:23 PM, Denmat <tu2bg...@gmail.com> wrote:
> Hi,
>
> No, puppet is about setting desired state of your nodes rather than current
> state. That is:
> 'the service be started on this node'.
> 'this directory should not exist'.
>
> If the nodes work independently, it is always true.
> It's not really about 'that other nodes service should be up, but if it's
> not there right now, don't do this either'.
>
> I don't agree with this because some times different nodes of a cluster may
need to work together, such as Hadoop cluster. A Hadoop cluster has
namenode, jobtracker, datanodes and tasktrackers. If you want to bring the
whole cluster down, you need to turn off the services running on different
nodes in the order.
Hadoop provides a script to stop all services on different nodes using ssh,
but it is sequential, especially for a large cluster which has thousands
datanodes. But if puppet can provides remote resource I asked, puppet can
easily coordinate the start and stop of the whole cluster.
Now if you want something to take action based on a current state, like stop
> a service based on some other service, you could look at MCollective or
> eventhandlers in something like Nagios.
>
> Cheers,
> Den
>
>
> On 21/10/2011, at 16:01, Benyi Wang <bewang.t...@gmail.com> wrote:
>
> Is there a puppet module supporting remote resource? For example,
>
> service { "my_service":
> ensure => "stopped"
> require => RemoteService["remote_service"]
> }
>
> If a service on a remote host is done, then stop "my_service" on this host.
>
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