MCollective seems what I want. Thanks a lot.
On Fri, Oct 21, 2011 at 9:43 AM, Benyi Wang <bewang.t...@gmail.com> wrote:
> 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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