[Pacemaker] A function demand of the new environment.

[renayama19661014 at ybb.ne.jp]

Hi Andrew,

> Or are you looking for the ability to do more than simply prevent
> resources from running?

Yes. 
For the realization of the function to assure the practice of the resources of the cluster, we use
respawn.

We found the function that it might be replaced of respawn in a road map of OpenAIS/Corosync.
It seems to be a function such as the simple version of the CPG service.
But, the function does not yet become clear. 
Let me discuss it again after confirming development of Corosync/OpenAIS about this matter.

Best Regards,
Hideo Yamauchi.


--- Andrew Beekhof <andrew at beekhof.net> wrote:

> Apologies for the delay
> 
> On Tue, Sep 22, 2009 at 3:13 AM,  <renayama19661014 at ybb.ne.jp> wrote:
> > Hi Andrew,
> >
> >> Ok, but I'm trying to understand why.
> >
> > Thank you.
> >
> >> What function are these daemons performing?  Why do they need to keep
> >> running even when the node is in standby?
> >
> > For example, respawn can detect the abnormality of the node before becoming online by
> detecting
> > trouble in standby.
> 
> Even with respawn, the node still has to become a full cluster member
> and complete resource probing before the respawned processes can have
> any effect.
> 
> > In a sense it has the same effect to start pingd in respawn.
> 
> But we don't really encourage that anymore either.
> Certainly no-one else running openais based clusters has seemed overly
> concerned about being forced to run it as a resource.
> 
> You just have to write your rules so that the cluster produces the
> "correct" behavior when no value exists for your attribute(s).
> 
> Or are you looking for the ability to do more than simply prevent
> resources from running?
> 
> > In respawn which users made in imitation of pingd, what a function to detect in this standby
> state is
> > included in will be expected.
> >
> > Best Regards,
> > Hideo Yamauchi.
> >
> 
> _______________________________________________
> Pacemaker mailing list
> Pacemaker at oss.clusterlabs.org
> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>