[Swift-devel] Re: coaster features

[Mihael Hategan]

On Fri, 2009-05-15 at 11:41 -0500, Zhao Zhang wrote:
> >
> > I'm not sure how you know it's working if you don't know what it's
> > supposed to do.
> >
> > Without this, workers use the external IP (the one the service is
> > started with) to contact the service. With it, one can force the workers
> > to contact a specific IP after starting. This is needed if the worker
> > nodes don't generally have access to the outside of the cluster.
> >
> > This has nothing to do with notification or status files. If this
> > setting is required (due to the network configuration of the cluster)
> > and it is not specified, the coasters won't work at all.
> >
> >   
> Again, about this feature. How could we know that we need internal IP 
> for the site before we run anything on it?
> Is is by experience or some tool could tell us about it? Thanks.

You need it when you can't access the head node's public IP from a
worker node. There is no tool I know of to test whether that's the case.